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import.go
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import.go
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package gou
import (
"bufio"
"encoding/csv"
"fmt"
"io"
"os"
)
// NewImport 创建导入器
func NewImport(chunk int) *Import {
return &Import{
Chunk: chunk,
Notify: func(line int, record string) {},
Option: map[string]interface{}{},
}
}
// Using 配置源数据与数据模型字段映射表或处理器
func (impt *Import) Using(process interface{}) *Import {
if process, ok := process.(map[string]string); ok {
impt.Mapping = process
}
if process, ok := process.(string); ok {
impt.Process = process
}
return impt
}
// Set 配置源数据与数据模型字段映射表或处理器
func (impt *Import) Set(key string, value interface{}) *Import {
impt.Option[key] = value
return impt
}
// NewResponse 创建导入器
func (impt *Import) NewResponse() *ResponseImport {
return &ResponseImport{
Errors: &ErrorsImport{},
Import: impt,
}
}
// InsertCSV 导入CSV使用 (insert)
func (impt *Import) InsertCSV(csvfile string, model string) *ResponseImport {
mod := Select(model)
resp := impt.NewResponse()
f, err := os.Open(csvfile)
defer f.Close()
if err != nil {
resp.Error("打开文件错误, %s", 400, err.Error()).FileIs(csvfile)
return resp
}
buf := bufio.NewReader(f)
reader := csv.NewReader(buf)
// CSV 分割符
if comma, has := impt.Option["comma"]; has {
if comma, ok := comma.(string); ok {
reader.Comma = []rune(comma)[0]
}
}
// CSV 换行符
if comment, has := impt.Option["comment"]; has {
if comment, ok := comment.(string); ok {
reader.Comma = []rune(comment)[0]
}
}
// CSV 去掉前导空格
reader.TrimLeadingSpace = true
if trimLeadingSpace, has := impt.Option["trim"]; has {
if trimLeadingSpace, ok := trimLeadingSpace.(bool); ok {
reader.TrimLeadingSpace = trimLeadingSpace
}
}
// CSV 记录位置
reader.FieldsPerRecord = 0
if fieldsPerRecord, has := impt.Option["fields"]; has {
if fieldsPerRecord, ok := fieldsPerRecord.(int); ok {
reader.FieldsPerRecord = fieldsPerRecord
}
}
// 遍历数据
line := 0
isColumn := true
fields := []string{}
data := []map[string]string{}
for {
line++
record, err := reader.Read()
if err == io.EOF {
break
}
if isColumn { // 字段清单
fields = record
isColumn = false
continue
}
if len(record) < len(fields) {
resp.Error("缺少字段", 400).FileIs(csvfile).AtLine(line)
continue
}
row := map[string]string{}
for i := range fields {
key := fields[i]
value := record[i]
row[key] = value
}
data = append(data, row)
size := len(data)
if size == impt.Chunk {
resp.InsertChunk(line-size, data, mod)
data = []map[string]string{}
}
}
// 插入最后一批数据
size := len(data)
if size >= 0 {
resp.InsertChunk(line-size, data, mod)
}
return resp
}
// InsertChunk 导入数据 (insert)
func (resp *ResponseImport) InsertChunk(line int, data []map[string]string, model *Model) {
total := len(data)
resp.Total = resp.Total + total
columns, values := resp.CastInsert(line, data, model)
err := model.Insert(columns, values)
if err != nil {
resp.Failure = resp.Failure + total
resp.Error(err.Error(), 500).AtLine(line).ValueIs(data)
return
}
resp.Success = resp.Success + total
}
// CastInsert 数据格式转换
func (resp *ResponseImport) CastInsert(line int, data []map[string]string, model *Model) ([]string, [][]interface{}) {
records := []map[string]interface{}{}
if resp.Import.Mapping != nil {
records = resp.castByMapping(line, data, model)
} else if resp.Import.Process != "" {
records = resp.castByProcess(line, data, model)
} else {
records = resp.castType(line, data, model)
}
if len(records) == 0 {
return nil, nil
}
columns := []string{}
values := [][]interface{}{}
for key := range records[0] {
columns = append(columns, key)
}
for _, record := range records {
value := []interface{}{}
for _, field := range columns {
value = append(value, record[field])
}
values = append(values, value)
}
return columns, values
}
// castByMapping 按映射表转换
func (resp *ResponseImport) castType(line int, data []map[string]string, model *Model) []map[string]interface{} {
res := []map[string]interface{}{}
return res
}
// castByMapping 按映射表转换
func (resp *ResponseImport) castByMapping(line int, data []map[string]string, model *Model) []map[string]interface{} {
res := []map[string]interface{}{}
if len(data) == 0 {
return res
}
// 是否仅导入 mapping 中定义字段
strict := false
if strictOption, has := resp.Import.Option["strict"]; has {
if strictOption, ok := strictOption.(bool); ok {
strict = strictOption
}
}
// 导入数据
mappingReverse := map[string]string{}
mapping := resp.Import.Mapping
for _, name := range model.ColumnNames {
if name, ok := name.(string); ok {
if key, has := mapping[name]; has {
mappingReverse[key] = name
} else if !strict { // 仅导入映射表中定义字段
if _, has := data[0][name]; has {
mappingReverse[name] = name
}
}
}
}
// 转换数据
for _, record := range data {
line++
row := map[string]interface{}{}
for key, name := range mappingReverse {
row[name] = record[key]
}
// 数值校验（）
errs := model.Validate(row)
if len(errs) > 0 {
for _, err := range errs {
resp.Error(err.Messages[0], 400).AtLine(line).FieldIs(err.Column)
}
continue
}
res = append(res, row)
}
return res
}
// castByMapping 按处理器转换
func (resp *ResponseImport) castByProcess(line int, data []map[string]string, model *Model) []map[string]interface{} {
res := []map[string]interface{}{}
return res
}
// IsError 错误检查
func (resp *ResponseImport) IsError(line int, process interface{}) bool {
return len(*resp.Errors) > 0
}
// Error 导入数据时错误
func (resp *ResponseImport) Error(mesage string, code int, args ...interface{}) *ErrorOfImport {
err := &ErrorOfImport{
Code: code,
Message: fmt.Sprintf(mesage, args...),
}
*resp.Errors = append(*resp.Errors, err)
return err
}
// FileIs 设置出错文件
func (err *ErrorOfImport) FileIs(filename string) *ErrorOfImport {
err.File = filename
return err
}
// AtLine 设置出错行
func (err *ErrorOfImport) AtLine(line int) *ErrorOfImport {
err.Line = line
return err
}
// FieldIs 设置出错字段
func (err *ErrorOfImport) FieldIs(name string) *ErrorOfImport {
err.Field = name
return err
}
// ValueIs 设置出错字段
func (err *ErrorOfImport) ValueIs(value interface{}) *ErrorOfImport {
err.Value = value
return err
}