CN111813788A - Information query method and device, and information synchronization method and device - Google Patents

Abstract

The application relates to a method and a device for querying information, a storage medium and an electronic device, wherein the method comprises the following steps: receiving a query request sent by a client, wherein the query request is used for requesting to query data change record information of a target object on a block chain; responding to the query request, and searching data change record information of a target object from a target database, wherein the target database is used for synchronously storing the data change record information of one or more objects on the block chain, and the one or more objects comprise the target object; and under the condition that the target data change record information corresponding to the target object is found, sending the target data change record information to the client. The method and the device solve the problem that the block chain data query mode in the related technology is low in query efficiency due to the fact that parallel processing cannot be conducted.

Description

Information query method and device, and information synchronization method and device

technical field

The present application relates to the field of computers, and in particular, to a method and device for querying information, and a method and device for synchronizing information.

Background technique

Blockchain is a storage technology. The blockchain system can use cryptography to ensure the security of data transmission and access, and generate an unforgeable and untamperable distributed ledger system.

BaaS (Blockchain as a Service) is a service based on blockchain technology to help users create, manage and maintain enterprise-level blockchain networks and applications. BaaS can provide assets based on blockchain networks Transaction module, including: asset transaction on-chain, transaction confirmation and other functions. BaaS can communicate with various blockchain nodes in the blockchain network to manage and maintain the blockchain network.

There are many behaviors in the blockchain, such as user registration, user recharge, asset issuance, etc. These behaviors will generate a large amount of data records. With the rapid growth of blockchain business, it brings severe challenges to the query of data change history. test.

At present, the traversal method is generally used to query the data change history in the blockchain. If you want to count the entire change history of a certain kind of data on the blockchain, for example, if you want to query the change history transaction records corresponding to the account assets of a user in the blockchain network, you need to start from the creation of the blockchain network. The block starts to traverse the block, and finds and identifies the record value corresponding to all the data to be queried in the block, so as to obtain the historical change record of the data.

The query method of the data historical change records in the above-mentioned blockchain mainly obtains all the data (for example, transaction records) by traversing the entire blockchain multiple times according to the generation order of the blocks. However, the above query method is a sequential serial process, and the entire blockchain needs to be traversed once each time. Based on the characteristics of the blockchain, multi-thread/multi-processor parallel processing is impossible, and the time cost is high, which is not suitable for massive data. When the data volume is large, it is easily limited by the memory and processor capacity of a single machine.

Therefore, the blockchain data query method in the related art has the problem of low query efficiency due to inability to perform parallel processing.

SUMMARY OF THE INVENTION

The present application provides a method and device for querying information, and a method and device for synchronizing information, to at least solve the problem of low query efficiency due to inability to perform parallel processing in the blockchain data query method in the related art.

According to an aspect of the embodiments of the present application, a method for querying information is provided, including: receiving a query request sent by a client, wherein the query request is used for requesting to query data change record information of a target object on the blockchain; responding to the query Request, find the data change record information of the target object from the target database, where the target database is used to synchronously save the data change record information of one or more objects on the blockchain, and one or more objects include the target object; In the case of the target data change log information corresponding to the target object, the target data change log information is sent to the client.

According to another aspect of the embodiments of the present application, a method for synchronizing information is provided, including: detecting that the record information corresponding to the target key value on the blockchain is updated, wherein the target key value is the target object in the blockchain The identification information, the record information corresponding to the target key value is used to record the transaction information of the target object; it is determined that the record information corresponding to the target key value is updated to the first transaction record information; the first transaction record information is synchronized as in the target database The first data change record information of the target object, wherein the target database is used to synchronously save the data change record information of one or more objects on the blockchain, and the one or more objects include the target object.

According to yet another aspect of the embodiments of the present application, an apparatus for querying information is provided, including: a first receiving unit, configured to receive a query request sent by a client, wherein the query request is used to request a query of a target object on the blockchain The search unit is used to respond to the query request and find the data change record information of the target object from the target database, wherein the target database is used to synchronously save the data change record information of one or more objects on the blockchain , the one or more objects include a target object; the first sending unit is configured to send the target data change record information to the client when the target data change record information corresponding to the target object is found.

According to yet another aspect of the embodiments of the present application, an information synchronization device is provided, including: a detection unit configured to detect that the record information corresponding to a target key value on the blockchain is updated, wherein the target key value is The identification information of the target object in the blockchain, the record information corresponding to the target key value is used to record the transaction information of the target object; the first determination unit is used to determine that the record information corresponding to the target key value is updated to the first transaction record information; a first synchronization unit for synchronizing the first transaction record information as the first data change record information of the target object in the target database, wherein the target database is used to synchronously save the data changes of one or more objects on the blockchain Record information, one or more objects including the target object.

According to yet another aspect of the embodiments of the present application, a computer-readable storage medium is also provided, where a computer program is stored in the storage medium, wherein the computer program is configured to execute any one of the above method embodiments when running. A step of.

According to yet another aspect of the embodiments of the present application, an electronic device is also provided, including a memory and a processor, where a computer program is stored in the memory, and the processor is configured to run the computer program to execute any of the above method embodiments. step.

In the embodiment of the present application, the database synchronously saves the data change record information of one or more objects on the blockchain, and receives a query request sent by the client, wherein the query request is used to request to query the target on the blockchain The data change record information of the object; in response to the query request, find the data change record information of the target object from the target database, wherein the target database is used to synchronously save the data change record information of one or more objects on the blockchain, one or more Each object includes the target object; when the target data change record information corresponding to the target object is found, the target data change record information is sent to the client, because the search is used to synchronously save one or more objects on the blockchain. The database of data change record information is used to query the data change record information of the target object on the blockchain. There is no need to traverse the entire blockchain multiple times to obtain all transaction records in the order of block generation. Multi-threading/multi-processor The parallel processing can achieve the purpose of quickly finding the data change record of the object, thereby achieving the technical effect of improving the query efficiency of blockchain information, and solving the problem of the blockchain data query method in the related technology due to the inability to parallel processing. This leads to the problem of low query efficiency.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. In other words, on the premise of no creative labor, other drawings can also be obtained from these drawings.

1 is a schematic diagram of a hardware environment of an information query method according to an embodiment of the present application;

2 is a flowchart of an optional information query method according to an embodiment of the present application;

3 is an optional flowchart of recording transaction data according to an embodiment of the present application;

4 is a flowchart of another optional information query method according to an embodiment of the present application;

5 is a flowchart of an optional information synchronization method according to an embodiment of the present application;

6 is a flowchart of another optional information query method according to an embodiment of the present application;

7 is a schematic diagram of an optional information query apparatus according to an embodiment of the present application;

8 is a schematic diagram of an optional information synchronization apparatus according to an embodiment of the present application;

FIG. 9 is a structural block diagram of an electronic device according to an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

According to an aspect of the embodiments of the present application, an embodiment of a method for querying information is provided. Optionally, in this embodiment, the above method for querying information may be applied to a hardware environment composed of a terminal 101 and a server 103 as shown in FIG. 1 . As shown in FIG. 1 , the server 103 is connected to the terminal 101 through the network, and can be used to provide services (such as game services, application services, etc.) for the terminal or the client installed on the terminal, and a database can be set on the server or independently of the server, For providing data storage services for the server 103, the above-mentioned network includes but is not limited to: a wide area network, a metropolitan area network or a local area network, and the terminal 101 is not limited to a PC, a mobile phone, a tablet computer, and the like. The information query method in this embodiment of the present application may be executed by the server 103 , may also be executed by the terminal 101 , or may be executed jointly by the server 103 and the terminal 101 . Wherein, the terminal 101 executes the information query method of the embodiment of the present application, and may also be executed by a client installed on the terminal 101 .

FIG. 2 is a flowchart of an optional information query method according to an embodiment of the present application. As shown in FIG. 2 , the method may include the following steps:

Step S202, receiving a query request sent by the client, wherein the query request is used to request to query the data change record information of the target object on the blockchain;

Step S204, in response to the query request, look up the data change record information of the target object from the target database, wherein the target database is used to synchronously save the data change record information of one or more objects on the blockchain, and one or more objects include the target object. object;

Step S206 , when the target data change record information corresponding to the target object is found, send the target data change record information to the client.

Through the above steps S202 to S206, a query request sent by the client is received, wherein the query request is used to request to query the data change record information of the target object on the blockchain; in response to the query request, the data change of the target object is searched from the target database. Record information, wherein the target database is used to synchronously save the data change record information of one or more objects on the blockchain, and one or more objects include the target object; when the target data change record information corresponding to the target object is found In this way, the target data change record information is sent to the client, which solves the problem of low query efficiency caused by the inability of parallel processing in the blockchain data query method in the related art, and improves the query efficiency of blockchain information.

In the technical solution provided in step S202, a query request sent by the client is received, wherein the query request is used to request to query the data change record information of the target object on the blockchain.

The information query method in this embodiment can be applied to an existing hyperledger framework, for example, Fabric. When querying the blockchain data change history, you can use the SDK (Software Development Kit, software development kit) in the Hyperledger framework to query. The data query scheme in related technologies requires a lot of traversal and identification, which makes the query process of the data change history in the blockchain slow and complicated, which reduces the query efficiency. In the fast-growing blockchain business, it is difficult to meet the high frequency of users. transaction data change history query requirements.

A BaaS platform can be a service platform based on a hyperledger framework (eg, Fabric). BaaS is a service that combines blockchain technology to help users create, manage, and maintain enterprise-level blockchain networks and applications. The main purpose of BaaS is to quickly establish the required blockchain application environment and provide a series of operational services such as search query, transaction, operation and maintenance, and data analysis based on the blockchain network.

BaaS simplifies the application development process and application deployment process by converting computing resources, communication resources, storage resources, and upper-layer blockchain accounting capabilities, blockchain application development capabilities, and blockchain supporting facilities capabilities into programmable interfaces. At the same time, through standardized capacity building, it ensures the safety and reliability of blockchain applications and provides support for the operation of blockchain business.

As a cloud service, BaaS is a cloud rental platform for blockchain facilities. Its multi-tenant feature allows computing resources, platform resources, and software resources to be shared to the greatest extent. BaaS provides the capabilities of node rental, chain rental and tool rental, including development tools, deployment tools, monitoring tools, etc., and through a large-capacity resource pool, it ensures that tenants’ business scale can be flexibly and elastically scaled, and rental facilities can be shared and independent. Enjoy, safe and reliable operation, and can also provide necessary technical support services. The capabilities of BaaS include: the ability to build blockchain nodes and the entire chain, the ability to develop blockchain applications, the ability to deploy blockchain applications, and the ability to monitor blockchain operations.

The system chaincode in Fabric can be deployed in the network nodes of the Hyperledger framework, and is responsible for the processing logic of the Fabric node itself, including: system configuration, endorsement, verification, etc. The registration and deployment are automatically completed when the peer node starts.

There are five types of system chaincodes:

(1) CSCC (Configuration System Chaincode), responsible for the configuration management of the ledger and chain;

(2) ESCC (Endorsement System Chaincode), responsible for the endorsement (signature) process, and can support the management of endorsement policies;

(3) LSCC (Lifecycle System Chaincode), responsible for managing the life cycle of the user chain code; the chain code life cycle includes installation, deployment, upgrade, rights management, information acquisition and other links;

(4) QSCC (Query System Chaincode), responsible for providing the information query function of the ledger and chain;

(5) VSCC (Verification System Chaincode, verification system chain code), responsible for checking according to the endorsement strategy before the transaction is submitted.

Optionally, the information query method in this embodiment may be performed by a system chain code, and the system chain code may be QSCC, or QSCC is combined with other system chain codes.

The user can submit a query request through the client running on the terminal device to request to query the data change record information of the target object on the blockchain. The query request may carry query parameters input by the user through the terminal device (data device), and the content of the query parameters may include: the name of the key value of the data to be queried, for example, the target key value. Clients can submit query requests to the system chaincode on the blockchain. The system chaincode on the blockchain can receive the query request sent by the client.

In the technical solution provided in step S204, the data change record information of the target object is searched from the target database in response to the query request, wherein the target database is used to synchronously save the data change record information of one or more objects on the blockchain, and a or more objects including the target object.

In order to improve the efficiency of data query, the data change record information (for example, transaction record information) of one or more objects on the blockchain can be synchronously saved as the corresponding data change record information in the target database. The one or more objects can be Include the target object.

In response to the received query request, the system chain code can look up the data change record information of the target object from the target database to determine whether the data change record information of the target object is saved in the target database, and which data change records of the target object are saved. information.

As an optional embodiment, searching the data change record information of the target object from the target database includes: obtaining the target key value carried in the query request, wherein the target key value is the identification information of the target object in the blockchain; using The hash value of the target key looks up the data change record information of the target object from the target database.

The target database can be a state database (stateDB), which stores the latest values of all keys in the transaction log, also called world state, which can be implemented based on levelDB or couchDB.

The system chain code can first parse the data key value (target key value) to be queried from the query parameters of the query request. The data key value is the identification information of the target object in the blockchain, that is, it is used in the blockchain. Then, according to the hash value of the data key value, the change history of the corresponding data key value is searched from the stateDB, and it is judged whether there is any data change history record to be queried.

With this embodiment, the change history record is queried by using the hash value of the key value corresponding to the object, so that the efficiency of the query can be improved and the security of the data query can be improved.

As an optional embodiment, searching for data change record information of the target object from the target database includes: acquiring time period information carried in the query request, where the time period information is used to indicate the query target object within the target time period. Data change record information; search for the data change record information of the target object within the target time period from the target database according to the time period information.

The data change record information saved in the target database can include: timestamp information of data changes, for example, transaction timestamp, which can be used to trace the original information in the blockchain when necessary for verification reference, It can effectively guarantee the authenticity of data change information.

For example, in the blockchain network system, user A's initial balance is 30 yuan. After a transaction occurs, user A earns 10 yuan from this transaction, and the balance becomes 40 yuan. The data change information that can be read in the related art is "the initial balance of user A is 30 yuan, the user's income is 10 yuan, and the balance of user A is 40 yuan", and it is determined that the system chain code has written the data. However, it is not certain when exactly the transaction took place.

In order to ensure that the change records stored in the target database can be traced and verified when needed, the system chain code can record the transaction ID, block height, timestamp and other information of this transaction, and combine the block height and transaction timestamp. and other information is saved to the target database. In this way, it is possible to quickly confirm the transaction/block generation time and transaction parameters in the blockchain as needed to ensure the authenticity of the blockchain data change history in the database.

In addition to the key value, the query parameters input by the user through the data device may also include: time period information, for example, the historical time period of the specified query, that is, the target time period. The system chain code can parse out the time period information from the query parameters of the query request, and find the data change record information of the target object in the target time period from the target database.

For example, user A's data history change information is shown in Table 1, and the query parameter indicates to return user A's balance change record on March 6, 2020, and the result is shown in Table 2.

Table 1

Transaction ID block height transaction timestamp lx001 101 2020-03-05 00:04:41 lx002 101 2020-03-05 01:14:41 lx003 102 2020-03-06 02:24:41 lx004 102 2020-03-06 03:34:41 lx005 103 2020-03-07 04:44:41

Table 2

Transaction ID block height transaction timestamp lx003 102 2020-03-06 02:24:41 lx004 102 2020-03-06 03:34:41

Through this embodiment, by limiting the time period for querying data change record information, the flexibility of data query can be improved, and the authenticity of the blockchain data change history stored in the database can be ensured.

In order to maintain the target database, the data change record information in the target database can be updated synchronously according to the transaction records of the objects on the blockchain.

As an optional embodiment, when it is detected that the record information corresponding to the target key value on the blockchain is updated, it can be determined that the record information corresponding to the target key value is updated to the first transaction record information, wherein , the target key value is the identification information of the target object in the blockchain, and the record information corresponding to the target key value is used to record the transaction information of the target object; the first transaction record information is synchronized to the first data change record information in the target database , wherein the target data change record information includes first data change record information.

There are many behaviors in the blockchain, such as user registration, user recharge, asset issuance, etc. These behaviors will generate a large number of data records. The above data records can be saved on the blockchain by means of data change record information. The system chain The code can periodically or event-triggered to monitor the data changes of the change history on the blockchain.

The system chain code in the blockchain network system can automatically track the changes of the data key value (key value, that is, the target key value) in each transaction record: in the record variable (value value, that is, the record value corresponding to each data key value) information) is written into the block in the blockchain network system, the system chain code obtains the information of this transaction and the information of the transaction in the block.

For the target object, whenever it is found that the record variable corresponding to the target key value on the blockchain is updated due to a transaction, the system chaincode can synchronize the transaction information (for example, the first transaction record information) to the stateDB.

For example, after user A conducts a transaction at a certain point in time, the user's balance in the blockchain ledger becomes 30 yuan. In order to record the change of user A's balance on the blockchain at this point in time, the system chain code will be stored in the stateDB. Synchronize a data change log message.

Through this embodiment, by monitoring the changes of the transaction change history data on the blockchain and synchronizing to the target database, the accuracy and timeliness of the data information in the target database can be improved.

As an optional embodiment, synchronizing the first transaction record information as the first data change record information in the target database includes: acquiring target record information in the first transaction record information, wherein the target record information includes: a transaction identifier , the transaction timestamp, the height of the block where the first transaction record information is located; the target record information is synchronized to the first data change record information in the target database.

When synchronizing the transaction record information on the blockchain and the data change record information in the target database, the transaction record information can be directly synchronized to the target database. In this case, the complete transaction is saved in the target database. record information.

In order to make reasonable use of the data storage capacity of the target database and avoid the query efficiency being reduced due to the excessive occupation of resources due to the large amount of information, part of the information in the transaction record information can be synchronized as the data change record information in the target database.

The system chain code can obtain information such as the transaction identifier, transaction time stamp, and the height of the block where the first transaction record information is contained in the first transaction record information, that is, the target record information, and synchronize the target record information as the target record information in the target database. The first data change record information.

For example, in stateDB, for the data key value of user A's balance: key=user A's hash value, value={transaction ID-1, transaction time-1, block height-1}.

Through this embodiment, by synchronizing the acquired transaction record information into the target database, the data storage capability of the target database can be improved, and the resource occupation of each data storage can be reduced.

As an optional embodiment, after synchronizing the first transaction record information as the first data change record information in the target database, it may be detected that the record information corresponding to the target key value on the blockchain is updated Next, it is determined that the record information corresponding to the target key value is updated to the second transaction record information; after the location of the first data change record information in the target database, the second data change record information corresponding to the second transaction record information is added. , wherein the target data change record information includes second data change record information.

User data changes are random, that is, they can be changed according to user needs and other circumstances. Therefore, after synchronizing the first transaction record information as the first data change record information, a new transaction record can be generated on the blockchain. The system chaincode can synchronize new transaction records to the target database.

In order to improve the data query efficiency, the new transaction record information can be synchronized after the existing data change record information, that is, new data change record information is added after the existing data change record information.

If it is detected that the record information corresponding to the target key value on the blockchain is updated to the second transaction record information, the system chain code can add the record information corresponding to the second transaction record information after the location of the first data change record information in the target database. The second data change record information.

For example, after user A has a transaction at a certain point in time, the user balance in the blockchain ledger becomes 40 yuan. In order to record the data changes of a block on the blockchain at this point in time, the system chain code will A new history record is added to the stateDB, and the content of the history record includes: transaction ID, block height where the transaction record is located, and transaction timestamp information. key = hash value of user A, value = {{transaction ID-1, transaction time-1, block height-1}, {transaction ID-2, transaction time-2, block height-2}}.

If a series of transaction behaviors continue to occur in the blockchain network system, the above methods can continue to be used to update the record variables corresponding to the data key values.

With this embodiment, the new transaction record information can be synchronized by adding new data change record information to the existing data change record information, so that the efficiency of information query can be improved.

It should be noted that before the transaction records are uploaded to the chain or the information is synchronized, the information can be verified in advance: the transaction structure can be parsed, and the transaction structure format can be verified; the element version in the read set of the transaction and the local ledger can be checked The version is the same; check with valid endorsement information (mainly check signature information); return correct if passed, otherwise return an error message.

In addition, stop and start commands are also supported to disable and re-enable the chaincode. After the chaincode is successfully installed and instantiated, the chaincode is active (running) and can be invoked by the invoke command to process transactions.

The storage and recording of transaction history is described below with optional examples. As shown in Figure 3, the flow of the transaction data recording method in this example may include the following steps:

Step S302, monitoring and acquiring the data changes of the change history to be queried on the blockchain.

The system chain code can monitor and track the key field of each transaction data on the blockchain, and automatically track the changes of the data key value (key value) in each transaction record. ) is written into the block in the blockchain network system, that is, when the value corresponding to the key field in a transaction is updated, the system chain code obtains the information of the transaction and the transaction information in the block. Information (specifically, the transaction ID, block height, timestamp, etc. of this transaction).

Step S304, the transaction ID, block height, timestamp and other information corresponding to the updated data on the blockchain are synchronized and added to the stateDB.

Synchronize the updated data on the blockchain to the stateDB through the system chain code: The system chain code will add a new key in the stateDB with the hash value of the corresponding key field, and additionally write the change record information to keep the data changes in the stateDB. Information synchronization, wherein the content of the change record includes: transaction ID, block height, timestamp and other information involved in the change.

Repeat the above steps to ensure the synchronization of transaction ID, block height, timestamp and other information generated by data key value changes.

In the technical solution provided in step S206, when the target data change record information corresponding to the target object is found, the target data change record information is sent to the client.

If the data change record information corresponding to the target object is found, that is, the target data change record information, the system chain code can send the target data change record information to the client. For example, the returned query results can be as shown in Table 2.

If the target data change record information is part of the target transaction record information, that is, the part of the target database that stores the user's transaction record information, and the query request requests the complete transaction record information, the system chaincode can obtain the target The height of the target block contained in the data change record information; obtain the target transaction record information corresponding to the target object from the block indicated by the target block height on the blockchain; and send the target transaction record information to the client.

Optionally, in this embodiment, the target data change record information may correspond to the target transaction record information (if any) of the target object on the blockchain, and the target data change record information includes: the target transaction identifier of the target transaction record information, The target transaction timestamp of the target transaction record information, and the height of the target block where the target transaction record information is located. In the case where there are multiple target data change record information, each data change record information corresponds to a combination of transaction identifier, transaction time stamp and block height.

As an optional implementation manner, after the target data change record information is sent to the client, a verification request sent by the client may be received, wherein the verification request is used to request to verify the target data change record information, The verification request carries the target transaction ID, target transaction timestamp and target block height; according to the target transaction ID and target transaction timestamp, obtain the target transaction record information from the block corresponding to the target block height on the blockchain When the target transaction record information is obtained, use the target transaction record information to verify the target data change record information to obtain a first verification result; and send the first verification result to the client.

The target data change record information sent to the user is obtained by the system chain code from the target database, not from the blockchain. In order to avoid affecting the user's experience due to the user's doubts about the authenticity and accuracy of the obtained data. It can provide users with the service of data re-inspection on the blockchain. For example, through BaaS, data re-inspection is performed on the blockchain based on information such as transaction identifiers, transaction timestamps, and the height of the block where the transaction record information corresponding to the data change record information is located.

After receiving the target data change record information, the user can operate the interface of the client to trigger the verification process of the target data change record information. After detecting the target operation performed on the client's interface, the client can generate a verification request carrying the target transaction identifier, target transaction timestamp and target block height, and send the verification request to the system chain code (a type of blockchain node, or other blockchain nodes) to request verification of the target data change record information. In the case of multiple target data change record information, the verification request may carry the transaction identifier, transaction timestamp and block height in all or part of the data change record information, so as to verify all or part of the data change record information. test.

After receiving the verification request, the system chain code can obtain the target transaction record information from the block corresponding to the height of the target block on the blockchain according to the target transaction identifier and the target transaction timestamp. If the target transaction record information is obtained, the target data change record information can be used to verify the target data change record information, for example, the transaction amount, transaction party, amount change information, etc. are verified, and the first verification result is obtained. The results may indicate the authenticity and accuracy of the target data change record information.

After obtaining the first verification result, the system chain code can send the first verification result to the client, so that the client can display the verification result to the user.

As another optional implementation manner, after obtaining the target transaction record information from the block corresponding to the target block height on the blockchain according to the target transaction identifier and the target transaction time stamp, after the target transaction record is not obtained In the case of information, a second verification result may be sent to the client, where the second verification result is used to indicate that the target data change record information verification fails.

If the transaction record information corresponding to the target transaction identifier and the target transaction timestamp is not obtained from the block corresponding to the target block height on the blockchain, it can be determined that the target data change record information is untrue or inaccurate , and then it is determined that the verification of the target data change record information fails. The system chain code may send the second verification result to the client to indicate that the verification of the target data change record information fails.

Through this embodiment, by receiving the verification request carrying the transaction identifier, transaction timestamp and block height, and verifying the data change record information, it is possible to avoid users' doubts on the authenticity and accuracy of the acquired data. and affect the user experience.

As an optional embodiment, after the data change record information of the target object is searched from the target database, if no data change record information corresponding to the target object is found, prompt information may be sent to the client, wherein , the prompt information is used to prompt that the data change record information corresponding to the target object is not found.

For example, if the change history of the corresponding data key value is queried in the stateDB table, the query result will be returned to the client. If the query result is empty, the corresponding prompt information can be returned to indicate that the corresponding change record information has not been found. .

The query process of the change history record information is described below with optional examples. As shown in Figure 4, the flow of the information query method in this example may include the following steps:

Step S402, a query request is input in the BaaS.

The user can submit the key-value field of the data change history to be queried in BaaS to the system chain code on the blockchain, and the query request is the query parameter input by the user through the data device. The content of the query parameter includes: the name of the key value of the data to be queried, the specified query historical time period, and the like.

Step S404, the system chain code is queried in stateDB.

The system chain code can parse the data key value to be queried from the query parameters, and then find the change history of the corresponding data key value from the stateDB according to the hash value of the data key value, and judge whether there is any data change to be queried. history record.

Step S406, returning the query result to the BaaS.

If the change history of the corresponding data key value is queried in the stateDB table, the system chain code can return the query result to BaaS. If the query result is empty, it will return the corresponding prompt information.

According to another aspect of the embodiments of the present application, an embodiment of a method for synchronizing information is also provided. The information synchronization method can be applied to the synchronization process of the data on the blockchain and the data in the target database of the above information query method, and can also be applied to other processes that need to synchronize the data on the blockchain and the data in the target database. In a scenario, the method of synchronizing the data on the blockchain and the data in the target database in the above-mentioned embodiment can be used for the information synchronization process in this embodiment.

Optionally, in this embodiment, the above method for synchronizing information may be applied to the hardware environment as shown in FIG. 1 , and the method for synchronizing information may be executed by the server 103 , or by the terminal 101 , or It is executed jointly by the server 103 and the terminal 101 . The method for synchronizing information in the embodiments of the present application by the terminal 101 may also be performed by a client installed on the terminal 101 .

FIG. 5 is a flowchart of an optional information synchronization method according to an embodiment of the present application. As shown in FIG. 5 , the method may include the following steps:

Step S502, it is detected that the record information corresponding to the target key value on the blockchain is updated, wherein the target key value is the identification information of the target object in the blockchain, and the record information corresponding to the target key value is used to record the target object's identification information. Trading Information.

There are many behaviors of multiple users in the blockchain, such as user registration, user recharge, asset issuance, etc. These behaviors will generate a large number of data records. The above data records can be stored on the blockchain by means of data change record information, and the data records of different users can be uniquely identified by different key values. For the target object, the target object can be uniquely identified by the target key value, and the data change record information of the target object can be transaction record information of the target object.

If an operation such as a transaction occurs on the target object, a new transaction record can be generated, and the transaction record can be written to the blockchain. The record variable (value value, that is, record information) corresponding to the target key value on the blockchain is updated as a transaction is generated.

The system chaincode can periodically or event-triggered to monitor the data changes of the change history on the blockchain. After the record variable corresponding to the target key value is written into the block in the blockchain network system, the system chain code can detect that the record information corresponding to the target key value on the blockchain has been updated.

Step S504, it is determined that the record information corresponding to the target key value is updated to the first transaction record information.

If the system chain code detects that the record information corresponding to the target key value on the blockchain has been updated, it can be determined that the record information corresponding to the target key value is updated to the first transaction record information.

Step S506, synchronizing the first transaction record information as the first data change record information of the target object in the target database, wherein the target database is used to synchronously save the data change record information of one or more objects on the blockchain, one or more objects include the target object.

On the blockchain, the first data change record information can be synchronized to multiple blocks through the system chain code. At the same time, when synchronizing blocks through the system chain code, the records generated by each change can be appended to the target database, and each transaction record can be synchronized as a data change record information in the target database.

The target database can be used to synchronously save the data change record information of one or more objects (eg, target objects) on the blockchain. For the first transaction record information, the system chain code can synchronize it as the first data change record information of the target object in the target database.

Through the above steps S502 to S506, it is detected that the record information corresponding to the target key value on the blockchain is updated, wherein the target key value is the identification information of the target object in the blockchain, and the record information corresponding to the target key value is used record the transaction information of the target object; determine that the record information corresponding to the target key value is updated to the first transaction record information; synchronize the first transaction record information as the first data change record information of the target object in the target database, wherein the target The database is used to synchronously save the data change record information of one or more objects on the blockchain. One or more objects include the target object, which can facilitate the query of the user's transaction records by querying the target database, which solves the problems in related technologies. The query method of blockchain data has the problem of low query efficiency due to the inability of parallel processing, which improves the query efficiency of blockchain information.

As an optional embodiment, synchronizing the first transaction record information as the first data change record information of the target object in the target database includes:

Obtain the target record information in the first transaction record information, wherein the target record information includes: a transaction identifier, a transaction timestamp, and the height of the block where the first transaction record information is located;

The target record information is synchronized as the first data change record information of the target object in the target database.

As an optional embodiment, after synchronizing the first transaction record information as the first data change record information of the target object in the target database, the above method further includes:

When it is detected that the record information corresponding to the target key value on the blockchain is updated, it is determined that the record information corresponding to the target key value is updated to the second transaction record information;

After the location of the first data change record information in the target database, the second data change record information corresponding to the second transaction record information is added.

As an optional embodiment, synchronizing the first transaction record information as the first data change record information of the target object in the target database includes:

Obtain the target hash value corresponding to the target key value, and the target hash value is the identification information of the target object in the target database;

Determine the first data change record information according to the first transaction record information;

Write the first data change record information into the target database according to the target hash value.

The present application also provides an optional embodiment, which provides a method for querying the history of blockchain data changes based on BaaS and system chain codes.

With the passage of time, the number of blocks on the blockchain will increase. For traceability queries, such as querying the value change history record corresponding to a key, it is necessary to traverse the entire blockchain from the beginning, and the speed will increase. slower.

In this optional embodiment, the system chain code is used to monitor and obtain the data key values that need to be queried in the blockchain business. After the values corresponding to these key values are updated, the system chain code will update the transaction generated by the update operation. Information such as transaction ID, block height, and timestamp corresponding to the block are stored in the stateDB, and the stateDB can be directly queried through BaaS in the future. When it is necessary to query the change history of blockchain data, enter a query request in BaaS, and query the stateDB through the system chain code to obtain the change history of blockchain data.

As shown in FIG. 6 , the process of the method for querying the information provided in this optional embodiment may include the following steps:

Step S602, the system chain code synchronizes the updated data on the blockchain to the stateDB.

Through the system chain code, while synchronizing the block, the transaction, the block, timestamp and other information generated by each change are recorded or appended to the value of the stateDB corresponding to the new key obtained by calculating the hash with the key.

Step S604, the query request is input through the BaaS, and the system chain code receives the query request.

Step S606, the system chain code queries the data change history in the stateDB.

If you need to query the value change history record corresponding to a key, you only need to directly query the corresponding value in the stateDB according to the hash value of the key, and you can get all the blocks, transactions, and times related to the value change corresponding to the key. information such as stamps without traversing the entire blockchain.

Step S608, the system chain code returns the result to the BaaS.

Compared with the blockchain data change history query method in the related art, the information query method of this embodiment reduces the time for traversing the blockchain during query, and can greatly improve the efficiency of the blockchain data change history query. In addition, the transaction ID, block height and timestamp are retained in the data change history of stateDB. When a certain change history needs to be checked separately according to business requirements, the transaction ID, block height and timestamp can be used. The information directly locates the queried blockchain, and checks the piece of data, thus ensuring the authenticity and consistency of the data change history.

Through this embodiment, the data change history record is stored in the database, which improves the query speed of the data change history.

It should be noted that, for the sake of simple description, the foregoing method embodiments are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Because in accordance with the present application, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

From the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence or in a part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) execute the methods described in the various embodiments of this application.

According to yet another aspect of the embodiments of the present application, there is also provided an information query apparatus for implementing the above information query method. FIG. 7 is a schematic diagram of an optional information query apparatus according to an embodiment of the present application. As shown in FIG. 7 , the apparatus may include:

(1) The first receiving unit 72 is used to receive a query request sent by the client, wherein the query request is used to request to query the data change record information of the target object on the blockchain;

(2) The search unit 74 is connected to the receiving unit 72, and is used for responding to the query request to search for the data change record information of the target object from the target database, wherein the target database is used to synchronously save the data of one or more objects on the blockchain Data change record information, one or more objects including the target object;

(3) The first sending unit 76, connected to the searching unit 74, is configured to send the target data change record information to the client when the target data change record information corresponding to the target object is found.

It should be noted that the first receiving unit 72 in this embodiment may be configured to execute the above step S202, the searching unit 74 in this embodiment may be configured to execute the above step S704, and the first sending unit 76 in this embodiment may Used to execute the above step S706.

Through the above module, the query request sent by the client is received, wherein the query request is used for requesting to query the data change record information of the target object on the blockchain; in response to the query request, the data change record information of the target object is searched from the target database, wherein , the target database is used to synchronously save the data change record information of one or more objects on the blockchain, one or more objects include the target object; when the target data change record information corresponding to the target object is found, the target The data change record information is sent to the client, which solves the problem of low query efficiency caused by the inability of parallel processing in the blockchain data query method in the related art, and improves the query efficiency of blockchain information.

As an optional embodiment, the above device also includes:

(1) The second determination unit is used to determine the record information corresponding to the target key when it is detected that the record information corresponding to the target key on the blockchain is updated before receiving the query request sent by the client is updated to the first transaction record information, wherein the target key value is the identification information of the target object in the blockchain, and the record information corresponding to the target key value is used to record the transaction information of the target object;

(2) A second synchronization unit, configured to synchronize the first transaction record information to the first data change record information in the target database, wherein the target data change record information includes the second data change record information.

As an optional embodiment, the second synchronization unit includes:

(1) The first acquisition module is used to acquire the target record information in the first transaction record information, wherein the target record information includes: a transaction identifier, a transaction time stamp, and a block height where the first transaction record information is located;

(2) A first synchronization module, configured to synchronize the target record information to the first data change record information in the target database.

As an optional embodiment, the above device also includes:

(1) The third determining unit is used to detect that the record information corresponding to the target key value on the blockchain is updated after synchronizing the first transaction record information as the first data change record information in the target database Next, it is determined that the record information corresponding to the target key value is updated to the second transaction record information;

(2) A first adding unit, configured to add second data change record information corresponding to the second transaction record information after the location of the first data change record information in the target database.

As an optional embodiment, the search unit 74 includes:

(1) The second acquisition module is used to acquire the target key value carried in the query request, wherein the target key value is the identification information of the target object in the blockchain;

(2) The first search module is used to search the data change record information of the target object from the target database by using the hash value of the target key value.

As an optional embodiment, the search unit 74 includes:

(1) a third acquisition module, used for acquiring the time period information carried in the query request, wherein the time period information is used to represent the data change record information of the query target object within the target time period;

(2) The second search module is configured to search the data change record information of the target object within the target time period from the target database according to the time period information.

As an optional embodiment, the target data change record information corresponds to the target transaction record information of the target object on the blockchain, and the target data change record information includes: the target transaction identifier of the target transaction record information, the target transaction record information of the target transaction record information. Transaction timestamp, the height of the target block where the target transaction record information is located.

As an optional embodiment, the above device also includes:

(1) a second receiving unit, configured to receive a verification request sent by the client after sending the target data change record information to the client, wherein the verification request is used to request to verify the target data change record information, The verification request carries the target transaction ID, target transaction timestamp and target block height;

(2) an obtaining unit, used for obtaining target transaction record information from the block corresponding to the height of the target block on the blockchain according to the target transaction identifier and the target transaction timestamp;

(3) a verification unit, configured to use the target transaction record information to verify the target data change record information under the condition of acquiring the target transaction record information to obtain a first verification result;

(4) A second sending unit, configured to send the first verification result to the client.

As an optional embodiment, the above device also includes:

(1) A third sending unit, configured to send a second verification result to the client without acquiring the target transaction record information, wherein the second verification result is used to indicate the target data change record information verification Did not pass.

As an optional embodiment, the above device also includes:

(1) The fourth sending unit is configured to send prompt information to the client when the data change record information corresponding to the target object is not found after searching for the data change record information of the target object from the target database, wherein , the prompt information is used to prompt that the data change record information corresponding to the target object is not found.

According to yet another aspect of the embodiments of the present application, an apparatus for synchronizing information for implementing the above method for synchronizing information is also provided. FIG. 8 is a schematic diagram of an optional information synchronization apparatus according to an embodiment of the present application. As shown in FIG. 8 , the apparatus may include:

(1) The detection unit 82 is used to detect that the record information corresponding to the target key value on the blockchain is updated, wherein the target key value is the identification information of the target object in the blockchain, and the record information corresponding to the target key value Used to record the transaction information of the target object;

(2) the first determination unit 84, connected with the detection unit 82, is used to determine that the record information corresponding to the target key value is updated to the first transaction record information;

(3) The first synchronization unit 86, connected to the first determination unit 84, is used for synchronizing the first transaction record information as the first data change record information of the target object in the target database, wherein the target database is used for synchronously saving blocks Data change record information for one or more objects on the chain, including the target object.

Optionally, in this embodiment, the detection unit 82 and the foregoing third determination unit may be the same unit or different units; the first determination unit 84 and the foregoing second determination unit may be the same unit, or Can be different units.

It should be noted that the detection unit 82 in this embodiment may be used to perform the foregoing step S502, the first determination unit 84 in this embodiment may be used to perform the foregoing step S504, and the first synchronization unit 86 in this embodiment may be used to perform the foregoing step S504. Used to execute the aforementioned step S506.

Through the above module, it is detected that the record information corresponding to the target key value on the blockchain is updated, wherein the target key value is the identification information of the target object in the blockchain, and the record information corresponding to the target key value is used to record the target object. determine that the record information corresponding to the target key value is updated to the first transaction record information; synchronize the first transaction record information as the first data change record information of the target object in the target database, wherein the target database is used for synchronization Save the data change record information of one or more objects on the blockchain, and one or more objects include the target object, which solves the problem of low query efficiency caused by the inability of parallel processing in the blockchain data query method in the related art , which improves the query efficiency of blockchain information.

As an optional embodiment, the first synchronization unit 86 includes:

(1) The fourth acquisition module is used to acquire the target record information in the first transaction record information, wherein the target record information includes: a transaction identifier, a transaction time stamp, and the block height where the first transaction record information is located;

(2) A second synchronization module, configured to synchronize the target record information to the first data change record information of the target object in the target database.

It should be noted that the fourth acquisition module and the aforementioned first acquisition module may be the same module or different modules; the second synchronization module and the aforementioned first synchronization module may be the same module or different modules .

As an optional embodiment, the above device also includes:

(1) The fourth determination unit is configured to, after synchronizing the first transaction record information as the first data change record information of the target object in the target database, detects that the record information corresponding to the target key value on the blockchain is updated In the case of , it is determined that the record information corresponding to the target key value is updated to the second transaction record information;

(2) A second adding unit, configured to add second data change record information corresponding to the second transaction record information after the location of the first data change record information in the target database.

It should be noted that the fourth determination unit and the aforementioned third determination unit may be the same unit or different units; the second adding unit and the aforementioned first adding unit may be the same unit or different units .

As an optional embodiment, the first synchronization unit 86 includes:

(1) the 5th acquisition module is used for acquiring the target hash value corresponding to the target key value, and the target hash value is the identification information of the target object in the target database;

(2) a determination module for determining the first data change record information according to the first transaction record information;

(3) The writing module is used for writing the first data change record information into the target database according to the target hash value.

It should be noted here that the examples and application scenarios implemented by the foregoing modules and corresponding steps are the same, but are not limited to the contents disclosed in the foregoing embodiments. It should be noted that, as a part of the device, the above modules may run in the hardware environment as shown in FIG. 1 , and may be implemented by software or hardware, wherein the hardware environment includes a network environment.

According to yet another aspect of the embodiments of the present application, there is also provided an electronic device for implementing the above information query method or information synchronization method, where the electronic device may be a server, a terminal, or a combination thereof. Optionally, the electronic device may be a node on the blockchain, and a system chain code may be arranged on the node.

FIG. 9 is a structural block diagram of an electronic device according to an embodiment of the present application. As shown in FIG. 9 , the electronic device includes a memory 902 and a processor 904, where a computer program is stored in the memory 902, and the processor 904 is set to The steps in any one of the above method embodiments are performed by a computer program.

Optionally, in this embodiment, the above-mentioned electronic apparatus may be located in at least one network device among multiple network devices of a computer network.

Optionally, in this embodiment, the above-mentioned processor may be configured to execute the following steps through a computer program:

S1, receiving a query request sent by the client, wherein the query request is used to request to query the data change record information of the target object on the blockchain;

S2, in response to the query request, look up the data change record information of the target object from the target database, where the target database is used to synchronously save the data change record information of one or more objects on the blockchain, and the one or more objects include the target object ;

S3, in the case of finding the target data change record information corresponding to the target object, send the target data change record information to the client.

Optionally, in this embodiment, the above-mentioned processor may be configured to execute the following steps through a computer program:

S1, it is detected that the record information corresponding to the target key value on the blockchain is updated, wherein the target key value is the identification information of the target object in the blockchain, and the record information corresponding to the target key value is used to record the transaction of the target object information;

S2, determine that the record information corresponding to the target key value is updated to the first transaction record information;

S3: Synchronize the first transaction record information as the first data change record information of the target object in the target database, wherein the target database is used to synchronously save the data change record information of one or more objects on the blockchain, and one or more Objects include target objects.

Optionally, those of ordinary skill in the art can understand that the structure shown in FIG. 9 is only for illustration, and the electronic device can also be a smart phone (such as an Android mobile phone, an iOS mobile phone, etc.), a tablet computer, a palmtop computer, and a MID (Mobile Internet Devices, Mobile Internet equipment), PAD and other terminal equipment. FIG. 9 does not limit the structure of the above electronic device. For example, the electronic device may also include more or less components than those shown in FIG. 9 (eg, network interfaces, etc.), or have a different configuration than that shown in FIG. 9 .

The memory 902 may be used to store software programs and modules, such as program instructions/modules corresponding to the information query method and apparatus in the embodiments of the present application, or program instructions/modules corresponding to the information synchronization method and apparatus. Software programs and modules stored in the memory 902 are executed to execute various functional applications and data processing, that is, to implement the above-mentioned information query method or information synchronization method. Memory 902 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, memory 902 may further include memory located remotely from processor 904, and these remote memories may be connected to the terminal through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

The memory 902 may specifically be, but not limited to, be used to store data change record information of one or more objects.

As an example, as shown in FIG. 9 , the above-mentioned memory 902 may include, but is not limited to, the first receiving unit 72 , the searching unit 74 and the first sending unit 76 in the query apparatus including the above-mentioned information. In addition, it may also include, but is not limited to, other module units in the apparatus for querying the above information, which will not be repeated in this example.

As another example, the foregoing memory 902 may include, but is not limited to, the detecting unit 82 , the first determining unit 84 and the first synchronizing unit 86 in the synchronization apparatus including the foregoing information. In addition, it may also include, but is not limited to, other module units in the apparatus for synchronizing the above information, which will not be repeated in this example.

Optionally, the above-mentioned transmission device 906 is configured to receive or send data via a network. Specific examples of the above-mentioned networks may include wired networks and wireless networks. In one example, the transmission device 906 includes a NIC (Network Interface Controller, network adapter), which can be connected to other network devices and routers through a network cable so as to communicate with the Internet or a local area network. In one example, the transmission device 906 is an RF (Radio Frequency, radio frequency) module, which is used to communicate with the Internet in a wireless manner.

In addition, the above-mentioned electronic device may further include: a connection bus 908 for connecting various module components in the above-mentioned electronic device.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments, and details are not described herein again in this embodiment.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can Including: flash disk, ROM (Read-Only Memory, read-only memory), RAM (Random Access Memory, random access device), magnetic disk or optical disk, etc.

According to yet another aspect of the embodiments of the present application, a storage medium is also provided. Optionally, in this embodiment, the above-mentioned storage medium may be used to execute the program code of the information query method or the information synchronization method.

Optionally, in this embodiment, the foregoing storage medium may be located on at least one network device among multiple network devices in the network shown in the foregoing embodiment.

Optionally, in this embodiment, the storage medium is configured to store program codes for executing the following steps:

S1, receiving a query request sent by the client, wherein the query request is used to request to query the data change record information of the target object on the blockchain;

S2, in response to the query request, look up the data change record information of the target object from the target database, where the target database is used to synchronously save the data change record information of one or more objects on the blockchain, and the one or more objects include the target object ;

S3, in the case of finding the target data change record information corresponding to the target object, send the target data change record information to the client.

Optionally, in this embodiment, the storage medium is configured to store program codes for executing the following steps:

S1, it is detected that the record information corresponding to the target key value on the blockchain is updated, wherein the target key value is the identification information of the target object in the blockchain, and the record information corresponding to the target key value is used to record the transaction of the target object information;

S2, determine that the record information corresponding to the target key value is updated to the first transaction record information;

S3: Synchronize the first transaction record information as the first data change record information of the target object in the target database, wherein the target database is used to synchronously save the data change record information of one or more objects on the blockchain, and one or more Objects include target objects.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments, and details are not described herein again in this embodiment.

Optionally, in this embodiment, the above-mentioned storage medium may include, but is not limited to: U disk, ROM, RAM, removable hard disk, magnetic disk, or optical disk, and other mediums that can store program codes.

The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

If the integrated units in the above-mentioned embodiments are implemented in the form of software functional units and sold or used as independent products, they may be stored in the above-mentioned computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art, or all or part of the technical solution, and the computer software product is stored in a storage medium, Several instructions are included to cause one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

In the above-mentioned embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed client may be implemented in other manners. The apparatus embodiments described above are only illustrative, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or Integration into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of units or modules, and may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The above are only the preferred embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the principles of the present application, several improvements and modifications can also be made. It should be regarded as the protection scope of this application.

Claims (16)

1. A method for querying information, comprising:

receiving a query request sent by a client, wherein the query request is used for requesting to query data change record information of a target object on a block chain;

searching data change record information of the target object from a target database in response to the query request, wherein the target database is used for synchronously storing data change record information of one or more objects on the block chain, and the one or more objects comprise the target object;

and sending the target data change record information to the client under the condition that the target data change record information corresponding to the target object is found.

2. The method of claim 1, wherein prior to receiving the query request sent by the client, the method further comprises:

under the condition that it is detected that record information corresponding to a target key value on the block chain is updated, determining that the record information corresponding to the target key value is updated to first transaction record information, wherein the target key value is identification information of the target object in the block chain, and the record information corresponding to the target key value is used for recording the transaction information of the target object;

synchronizing the first transaction record information to first data change record information in the target database, wherein the target data change record information includes the first data change record information.

3. The method of claim 2, wherein synchronizing the first transaction record information to the first data change record information in the target database comprises:

acquiring target record information in the first transaction record information, wherein the target record information comprises: the transaction identification, the transaction timestamp and the block height of the first transaction record information are included;

and synchronizing the target record information into the first data change record information in the target database.

4. The method of claim 2, wherein after synchronizing the first transaction record information to the first data change record information in the target database, the method further comprises:

under the condition that the record information corresponding to the target key value on the block chain is detected to be updated, determining that the record information corresponding to the target key value is updated to be second transaction record information;

and adding second data change record information corresponding to the second transaction record information after the position of the first data change record information in the target database, wherein the target data change record information comprises the second data change record information.

5. The method of claim 1, wherein searching the target database for data change record information for the target object comprises:

acquiring a target key value carried in the query request, wherein the target key value is identification information of a target object in the block chain;

and searching the data change record information of the target object from the target database by using the hash value of the target key value.

6. The method of claim 1, wherein searching the target database for data change record information for the target object comprises:

acquiring time period information carried in the query request, wherein the time period information is used for indicating data change record information of the query target object in a target time period;

and searching data change record information of the target object in the target time period from the target database according to the time period information.

7. The method of claim 1, wherein the target data change log information corresponds to target transaction log information for the target object on the blockchain, the target data change log information comprising: a target transaction identifier of the target transaction record information, a target transaction timestamp of the target transaction record information, a target block height at which the target transaction record information is located,

after sending the target data change record information to the client, the method further comprises:

receiving a verification request sent by the client, wherein the verification request is used for requesting to verify the target data change record information, and the verification request carries the target transaction identifier, the target transaction timestamp and the target block height;

acquiring the target transaction record information from a block corresponding to the height of the target block on the block chain according to the target transaction identifier and the target transaction timestamp;

under the condition that the target transaction record information is obtained, verifying the target data change record information by using the target transaction record information to obtain a first verification result; sending the first checking result to the client;

and sending a second check result to the client under the condition that the target transaction record information is not acquired, wherein the second check result is used for indicating that the target data change record information is not checked.

8. The method of any of claims 1 to 7, wherein after looking up data change record information for the target object from the target database, the method further comprises:

and sending prompt information to the client under the condition that the data change record information corresponding to the target object is not found, wherein the prompt information is used for prompting that the data change record information corresponding to the target object is not found.

9. A method for synchronizing information, comprising:

detecting that record information corresponding to a target key value on a block chain is updated, wherein the target key value is identification information of a target object in the block chain, and the record information corresponding to the target key value is used for recording transaction information of the target object;

determining that record information corresponding to the target key value is updated to first transaction record information;

and synchronizing the first transaction record information into first data change record information of the target object in a target database, wherein the target database is used for synchronously storing data change record information of one or more objects on the block chain, and the one or more objects comprise the target object.

10. The method of claim 9, wherein synchronizing the first transaction record information to the first data change record information for the target object in the target database comprises:

acquiring target record information in the first transaction record information, wherein the target record information comprises: the transaction identification, the transaction timestamp and the block height of the first transaction record information are included;

and synchronizing the target record information into the first data change record information of the target object in the target database.

11. The method of claim 9, wherein after synchronizing the first transaction record information to the first data change record information for the target object in the target database, the method further comprises:

under the condition that the record information corresponding to the target key value on the block chain is detected to be updated, determining that the record information corresponding to the target key value is updated to be second transaction record information;

and adding second data change record information corresponding to the second transaction record information after the position of the first data change record information in the target database.

12. The method of any of claims 9 to 11, wherein synchronizing the first transaction record information to the first data change record information of the target object in the target database comprises:

acquiring a target hash value corresponding to the target key value, wherein the target hash value is identification information of the target object in the target database;

determining the first data change record information according to the first transaction record information;

and writing the first data change record information into the target database according to the target hash value.

13. An apparatus for querying information, comprising:

the system comprises a first receiving unit, a first sending unit and a second receiving unit, wherein the first receiving unit is used for receiving a query request sent by a client, and the query request is used for requesting to query data change record information of a target object on a block chain;

the searching unit is used for responding to the query request and searching data change record information of the target object from a target database, wherein the target database is used for synchronously storing data change record information of one or more objects on the block chain, and the one or more objects comprise the target object;

and the first sending unit is used for sending the target data change record information to the client under the condition that the target data change record information corresponding to the target object is found.

14. An apparatus for synchronizing information, comprising:

the system comprises a detection unit, a processing unit and a processing unit, wherein the detection unit is used for detecting that record information corresponding to a target key value on a block chain is updated, the target key value is identification information of a target object in the block chain, and the record information corresponding to the target key value is used for recording transaction information of the target object;

a first determining unit for determining that the record information corresponding to the target key value is updated as first transaction record information;

and the first synchronization unit is used for synchronizing the first transaction record information into first data change record information of the target object in a target database, wherein the target database is used for synchronously storing data change record information of one or more objects on the block chain, and the one or more objects comprise the target object.

15. A computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to carry out the method of any one of claims 1 to 12 when executed.

16. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method of any of claims 1 to 12 by means of the computer program.

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