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Copy pathdo.go
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837 lines (708 loc) · 22.4 KB
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package gen
import (
"context"
"database/sql"
"fmt"
"reflect"
"strings"
"gorm.io/gorm"
"gorm.io/gorm/callbacks"
"gorm.io/gorm/clause"
"gorm.io/gorm/schema"
"gorm.io/gen/field"
)
var (
createClauses = []string{"INSERT", "VALUES", "ON CONFLICT"}
queryClauses = []string{"SELECT", "FROM", "WHERE", "GROUP BY", "ORDER BY", "LIMIT", "FOR"}
updateClauses = []string{"UPDATE", "SET", "WHERE"}
deleteClauses = []string{"DELETE", "FROM", "WHERE"}
)
// ResultInfo query/execute info
type ResultInfo struct {
RowsAffected int64
Error error
}
var _ Dao = new(DO)
// DO (data object): implement basic query methods
// the structure embedded with a *gorm.DB, and has a element item "alias" will be used when used as a sub query
type DO struct {
db *gorm.DB
alias string // for subquery
modelType reflect.Type
schema *schema.Schema
backfillData interface{}
}
func (d DO) getInstance(db *gorm.DB) *DO {
d.db = db
return &d
}
type doOptions func(*gorm.DB) *gorm.DB
var (
// Debug use DB in debug mode
Debug doOptions = func(db *gorm.DB) *gorm.DB { return db.Debug() }
)
// UseDB specify a db connection(*gorm.DB)
func (d *DO) UseDB(db *gorm.DB, opts ...doOptions) {
db = db.Session(&gorm.Session{Context: context.Background()})
for _, opt := range opts {
db = opt(db)
}
d.db = db
}
func (d *DO) ReplaceDB(db *gorm.DB) { d.db = db }
// UseModel specify a data model structure as a source for table name
func (d *DO) UseModel(model interface{}) {
d.modelType = d.indirect(model)
err := d.db.Statement.Parse(model)
if err != nil {
panic(fmt.Errorf("Cannot parse model: %+v", model))
}
d.schema = d.db.Statement.Schema
}
func (d *DO) indirect(value interface{}) reflect.Type {
mt := reflect.TypeOf(value)
if mt.Kind() == reflect.Ptr {
mt = mt.Elem()
}
return mt
}
// UseTable specify table name
func (d *DO) UseTable(tableName string) { d.db = d.db.Table(tableName).Session(new(gorm.Session)) }
// TableName return table name
func (d DO) TableName() string {
if d.schema == nil {
return ""
}
return d.schema.Table
}
// Returning backfill data
func (d DO) Returning(value interface{}, columns ...string) Dao {
d.backfillData = value
var targetCulumns []clause.Column
for _, column := range columns {
targetCulumns = append(targetCulumns, clause.Column{Name: column})
}
d.db = d.db.Clauses(clause.Returning{Columns: targetCulumns})
return &d
}
// Session replace db with new session
func (d *DO) Session(config *gorm.Session) Dao { return d.getInstance(d.db.Session(config)) }
// UnderlyingDB return the underlying database connection
func (d *DO) UnderlyingDB() *gorm.DB { return d.underlyingDB() }
// Quote return qutoed data
func (d *DO) Quote(raw string) string { return d.db.Statement.Quote(raw) }
// Build implement the interface of claues.Expression
// only call WHERE clause's Build
func (d *DO) Build(builder clause.Builder) {
for _, e := range d.buildCondition() {
e.Build(builder)
}
}
func (d *DO) buildCondition() []clause.Expression {
return d.db.Statement.BuildCondition(d.db)
}
// underlyingDO return self
func (d *DO) underlyingDO() *DO { return d }
// underlyingDB return self.db
func (d *DO) underlyingDB() *gorm.DB { return d.db }
func (d *DO) withError(err error) *DO {
if err == nil {
return d
}
newDB := d.db.Session(new(gorm.Session))
_ = newDB.AddError(err)
return d.getInstance(newDB)
}
// implements Condition
func (d *DO) BeCond() interface{} { return d.buildCondition() }
func (d *DO) CondError() error { return nil }
// Debug return a DO with db in debug mode
func (d *DO) Debug() Dao { return d.getInstance(d.db.Debug()) }
// WithContext return a DO with db with context
func (d *DO) WithContext(ctx context.Context) Dao { return d.getInstance(d.db.WithContext(ctx)) }
// Clauses specify Clauses
func (d *DO) Clauses(conds ...clause.Expression) Dao {
if err := checkConds(conds); err != nil {
newDB := d.db.Session(new(gorm.Session))
_ = newDB.AddError(err)
return d.getInstance(newDB)
}
return d.getInstance(d.db.Clauses(conds...))
}
// As alias cannot be heired, As must used on tail
func (d DO) As(alias string) Dao {
d.alias = alias
return &d
}
// Columns return columns for Subquery
func (*DO) Columns(cols ...field.Expr) columns { return cols }
// ======================== chainable api ========================
func (d *DO) Not(conds ...Condition) Dao {
exprs, err := condToExpression(conds)
if err != nil {
return d.withError(err)
}
if len(exprs) == 0 {
return d
}
return d.getInstance(d.db.Clauses(clause.Where{Exprs: []clause.Expression{clause.Not(exprs...)}}))
}
func (d *DO) Or(conds ...Condition) Dao {
exprs, err := condToExpression(conds)
if err != nil {
return d.withError(err)
}
if len(exprs) == 0 {
return d
}
return d.getInstance(d.db.Clauses(clause.Where{Exprs: []clause.Expression{clause.Or(clause.And(exprs...))}}))
}
func (d *DO) Select(columns ...field.Expr) Dao {
if len(columns) == 0 {
return d.getInstance(d.db.Clauses(clause.Select{}))
}
query, args := buildExpr(d.db.Statement, columns...)
if len(args) == 0 {
return d.getInstance(d.db.Select(query))
}
return d.getInstance(d.db.Select(strings.Join(query, ","), args...))
}
func (d *DO) Where(conds ...Condition) Dao {
exprs, err := condToExpression(conds)
if err != nil {
return d.withError(err)
}
if len(exprs) == 0 {
return d
}
return d.getInstance(d.db.Clauses(clause.Where{Exprs: exprs}))
}
func (d *DO) Order(columns ...field.Expr) Dao {
// lazy build Columns
// if c, ok := d.db.Statement.Clauses[clause.OrderBy{}.Name()]; ok {
// if order, ok := c.Expression.(clause.OrderBy); ok {
// if expr, ok := order.Expression.(clause.CommaExpression); ok {
// expr.Exprs = append(expr.Exprs, toExpression(columns)...)
// return d.newInstance(d.db.Clauses(clause.OrderBy{Expression: expr}))
// }
// }
// }
// return d.newInstance(d.db.Clauses(clause.OrderBy{Expression: clause.CommaExpression{Exprs: toExpression(columns)}}))
if len(columns) == 0 {
return d
}
return d.getInstance(d.db.Order(d.calcOrderValue(columns...)))
}
func (d *DO) calcOrderValue(columns ...field.Expr) string {
// eager build Columns
orderArray := make([]string, len(columns))
for i, c := range columns {
orderArray[i] = c.Build(d.db.Statement).String()
}
return strings.Join(orderArray, ",")
}
func (d *DO) Distinct(columns ...field.Expr) Dao {
return d.getInstance(d.db.Distinct(toInterfaceSlice(toColExprFullName(d.db.Statement, columns...))...))
}
func (d *DO) Omit(columns ...field.Expr) Dao {
if len(columns) == 0 {
return d
}
return d.getInstance(d.db.Omit(getColumnName(columns...)...))
}
func (d *DO) Group(columns ...field.Expr) Dao {
if len(columns) == 0 {
return d
}
name := string(columns[0].Build(d.db.Statement))
for _, col := range columns[1:] {
name += "," + string(col.Build(d.db.Statement))
}
return d.getInstance(d.db.Group(name))
}
func (d *DO) Having(conds ...Condition) Dao {
exprs, err := condToExpression(conds)
if err != nil {
return d.withError(err)
}
if len(exprs) == 0 {
return d
}
return d.getInstance(d.db.Clauses(clause.GroupBy{Having: exprs}))
}
func (d *DO) Limit(limit int) Dao {
return d.getInstance(d.db.Limit(limit))
}
func (d *DO) Offset(offset int) Dao {
return d.getInstance(d.db.Offset(offset))
}
func (d *DO) Scopes(funcs ...func(Dao) Dao) Dao {
fcs := make([]func(*gorm.DB) *gorm.DB, len(funcs))
for i, f := range funcs {
sf := f
fcs[i] = func(tx *gorm.DB) *gorm.DB { return sf(d.getInstance(tx)).(*DO).db }
}
return d.getInstance(d.db.Scopes(fcs...))
}
func (d *DO) Unscoped() Dao {
return d.getInstance(d.db.Unscoped())
}
func (d *DO) Join(table schema.Tabler, conds ...field.Expr) Dao {
return d.join(table, clause.InnerJoin, conds)
}
func (d *DO) LeftJoin(table schema.Tabler, conds ...field.Expr) Dao {
return d.join(table, clause.LeftJoin, conds)
}
func (d *DO) RightJoin(table schema.Tabler, conds ...field.Expr) Dao {
return d.join(table, clause.RightJoin, conds)
}
func (d *DO) join(table schema.Tabler, joinType clause.JoinType, conds []field.Expr) Dao {
if len(conds) == 0 {
return d.withError(ErrEmptyCondition)
}
from := getFromClause(d.db)
from.Joins = append(from.Joins, clause.Join{
Type: joinType,
Table: clause.Table{Name: table.TableName()},
ON: clause.Where{Exprs: toExpression(conds...)},
})
return d.getInstance(d.db.Clauses(from))
}
func (d *DO) Attrs(attrs ...field.AssignExpr) Dao {
if len(attrs) == 0 {
return d
}
return d.getInstance(d.db.Attrs(d.attrsValue(attrs)...))
}
func (d *DO) Assign(attrs ...field.AssignExpr) Dao {
if len(attrs) == 0 {
return d
}
return d.getInstance(d.db.Assign(d.attrsValue(attrs)...))
}
func (d *DO) attrsValue(attrs []field.AssignExpr) []interface{} {
values := make([]interface{}, 0, len(attrs))
for _, attr := range attrs {
if expr, ok := attr.AssignExpr().(clause.Eq); ok {
values = append(values, expr)
}
}
return values
}
func (d *DO) Joins(field field.RelationField) Dao {
return d.getInstance(d.db.Joins(field.Path()))
}
// func (d *DO) Preload(column field.RelationPath, subQuery ...SubQuery) Dao {
// if len(subQuery) > 0 {
// return d.getInstance(d.db.Preload(string(column.Path()), subQuery[0].underlyingDB()))
// }
// return d.getInstance(d.db.Preload(string(column.Path())))
// }
func (d *DO) Preload(field field.RelationField) Dao {
var args []interface{}
if conds := field.GetConds(); len(conds) > 0 {
args = append(args, toExpressionInterface(conds...)...)
}
if columns := field.GetSelect
8000
s(); len(columns) > 0 {
colNames := make([]string, len(columns))
for i, c := range columns {
colNames[i] = string(c.ColumnName())
}
args = append(args, func(db *gorm.DB) *gorm.DB {
return db.Select(colNames)
})
}
if columns := field.GetOrderCol(); len(columns) > 0 {
args = append(args, func(db *gorm.DB) *gorm.DB {
return db.Order(d.calcOrderValue(columns...))
})
}
if clauses := field.GetClauses(); len(clauses) > 0 {
args = append(args, func(db *gorm.DB) *gorm.DB {
return db.Clauses(clauses...)
})
}
if offset, limit := field.GetPage(); offset|limit != 0 {
args = append(args, func(db *gorm.DB) *gorm.DB {
return db.Offset(offset).Limit(limit)
})
}
return d.getInstance(d.db.Preload(field.Path(), args...))
}
// UpdateFrom specify update sub query
func (d *DO) UpdateFrom(q subQuery) Dao {
var tableName strings.Builder
d.db.Statement.QuoteTo(&tableName, d.TableName())
if d.alias != "" {
tableName.WriteString(" AS ")
d.db.Statement.QuoteTo(&tableName, d.alias)
}
tableName.WriteByte(',')
if _, ok := q.underlyingDB().Statement.Clauses["SELECT"]; ok || len(q.underlyingDB().Statement.Selects) > 0 {
tableName.WriteString("(" + q.underlyingDB().ToSQL(func(tx *gorm.DB) *gorm.DB { return tx.Table(q.underlyingDO().TableName()).Find(nil) }) + ")")
} else {
d.db.Statement.QuoteTo(&tableName, q.underlyingDO().TableName())
}
if alias := q.underlyingDO().alias; alias != "" {
tableName.WriteString(" AS ")
d.db.Statement.QuoteTo(&tableName, alias)
}
return d.getInstance(d.db.Clauses(clause.Update{Table: clause.Table{Name: tableName.String(), Raw: true}}))
}
func getFromClause(db *gorm.DB) *clause.From {
if db == nil || db.Statement == nil {
return &clause.From{}
}
c, ok := db.Statement.Clauses[clause.From{}.Name()]
if !ok || c.Expression == nil {
return &clause.From{}
}
from, ok := c.Expression.(clause.From)
if !ok {
return &clause.From{}
}
return &from
}
// ======================== finisher api ========================
func (d *DO) Create(value interface{}) error {
return d.db.Create(value).Error
}
func (d *DO) CreateInBatches(value interface{}, batchSize int) error {
return d.db.CreateInBatches(value, batchSize).Error
}
func (d *DO) Save(value interface{}) error {
return d.db.Clauses(clause.OnConflict{UpdateAll: true}).Create(value).Error
}
func (d *DO) First() (result interface{}, err error) {
return d.singleQuery(d.db.First)
}
func (d *DO) Take() (result interface{}, err error) {
return d.singleQuery(d.db.Take)
}
func (d *DO) Last() (result interface{}, err error) {
return d.singleQuery(d.db.Last)
}
func (d *DO) singleQuery(query func(dest interface{}, conds ...interface{}) *gorm.DB) (result interface{}, err error) {
if d.modelType == nil {
return d.singleScan()
}
result = d.newResultPointer()
if err := query(result).Error; err != nil {
return nil, err
}
return result, nil
}
func (d *DO) singleScan() (result interface{}, err error) {
result = map[string]interface{}{}
err = d.db.Scan(result).Error
return
}
func (d *DO) Find() (results interface{}, err error) {
return d.multiQuery(d.db.Find)
}
func (d *DO) multiQuery(query func(dest interface{}, conds ...interface{}) *gorm.DB) (results interface{}, err error) {
if d.modelType == nil {
return d.findToMap()
}
resultsPtr := d.newResultSlicePointer()
err = query(resultsPtr).Error
return reflect.Indirect(reflect.ValueOf(resultsPtr)).Interface(), err
}
func (d *DO) findToMap() (interface{}, error) {
var results []map[string]interface{}
err := d.db.Find(&results).Error
return results, err
}
func (d *DO) FindInBatches(dest interface{}, batchSize int, fc func(tx Dao, batch int) error) error {
return d.db.FindInBatches(dest, batchSize, func(tx *gorm.DB, batch int) error { return fc(d.getInstance(tx), batch) }).Error
}
func (d *DO) FirstOrInit() (result interface{}, err error) {
return d.singleQuery(d.db.FirstOrInit)
}
func (d *DO) FirstOrCreate() (result interface{}, err error) {
return d.singleQuery(d.db.FirstOrCreate)
}
func (d *DO) Update(column field.Expr, value interface{}) (info ResultInfo, err error) {
tx := d.db.Model(d.newResultPointer())
columnStr := column.BuildColumn(d.db.Statement, field.WithoutQuote).String()
var result *gorm.DB
switch value := value.(type) {
case field.AssignExpr:
result = tx.Update(columnStr, value.AssignExpr())
case subQuery:
result = tx.Update(columnStr, value.underlyingDB())
default:
result = tx.Update(columnStr, value)
}
return ResultInfo{RowsAffected: result.RowsAffected, Error: result.Error}, result.Error
}
func (d *DO) UpdateSimple(columns ...field.AssignExpr) (info ResultInfo, err error) {
if len(columns) == 0 {
return
}
result := d.db.Model(d.newResultPointer()).Clauses(d.assignSet(columns)).Omit("*").Updates(map[string]interface{}{})
return ResultInfo{RowsAffected: result.RowsAffected, Error: result.Error}, result.Error
}
func (d *DO) Updates(value interface{}) (info ResultInfo, err error) {
var result *gorm.DB
var rawTyp, typ reflect.Type
rawTyp = reflect.TypeOf(value)
typ = rawTyp
if typ.Kind() == reflect.Ptr {
typ = typ.Elem()
}
switch {
case typ != d.modelType:
result = d.db.Model(d.newResultPointer()).Updates(value)
case rawTyp.Kind() == reflect.Ptr:
result = d.db.Updates(value)
default:
ptr := reflect.New(d.modelType)
ptr.Elem().Set(reflect.ValueOf(value))
result = d.db.Updates(ptr.Interface())
}
return ResultInfo{RowsAffected: result.RowsAffected, Error: result.Error}, result.Error
}
func (d *DO) UpdateColumn(column field.Expr, value interface{}) (info ResultInfo, err error) {
tx := d.db.Model(d.newResultPointer())
columnStr := column.BuildColumn(d.db.Statement, field.WithoutQuote).String()
var result *gorm.DB
switch value := value.(type) {
case field.Expr:
result = tx.UpdateColumn(columnStr, value.RawExpr())
case subQuery:
result = d.db.UpdateColumn(columnStr, value.underlyingDB())
default:
result = d.db.UpdateColumn(columnStr, value)
}
return ResultInfo{RowsAffected: result.RowsAffected, Error: result.Error}, result.Error
}
func (d *DO) UpdateColumnSimple(columns ...field.AssignExpr) (info ResultInfo, err error) {
if len(columns) == 0 {
return
}
result := d.db.Model(d.newResultPointer()).Clauses(d.assignSet(columns)).Omit("*").UpdateColumns(map[string]interface{}{})
return ResultInfo{RowsAffected: result.RowsAffected, Error: result.Error}, result.Error
}
func (d *DO) UpdateColumns(value interface{}) (info ResultInfo, err error) {
result := d.db.Model(d.newResultPointer()).UpdateColumns(value)
return ResultInfo{RowsAffected: result.RowsAffected, Error: result.Error}, result.Error
}
// assignSet fetch all set
func (d *DO) assignSet(exprs []field.AssignExpr) (set clause.Set) {
for _, expr := range exprs {
column := clause.Column{Name: string(expr.ColumnName())}
if d.alias != "" {
column.Table = d.alias
}
switch e := expr.AssignExpr().(type) {
case clause.Expr:
set = append(set, clause.Assignment{Column: column, Value: e})
case clause.Eq:
set = append(set, clause.Assignment{Column: column, Value: e.Value})
case clause.Set:
set = append(set, e...)
}
}
stmt := d.db.Session(&gorm.Session{}).Statement
stmt.Dest = map[string]interface{}{}
return append(set, callbacks.ConvertToAssignments(stmt)...)
}
func (d *DO) Delete() (info ResultInfo, err error) {
result := d.db.Model(d.newResultPointer()).Delete(reflect.New(d.modelType).Interface())
return ResultInfo{RowsAffected: result.RowsAffected, Error: result.Error}, result.Error
}
func (d *DO) Count() (count int64, err error) {
return count, d.db.Session(&gorm.Session{}).Model(d.newResultPointer()).Count(&count).Error
}
func (d *DO) Row() *sql.Row {
return d.db.Model(d.newResultPointer()).Row()
}
func (d *DO) Rows() (*sql.Rows, error) {
return d.db.Model(d.newResultPointer()).Rows()
}
func (d *DO) Scan(dest interface{}) error {
return d.db.Model(d.newResultPointer()).Scan(dest).Error
}
func (d *DO) Pluck(column field.Expr, dest interface{}) error {
return d.db.Model(d.newResultPointer()).Pluck(column.ColumnName().String(), dest).Error
}
func (d *DO) ScanRows(rows *sql.Rows, dest interface{}) error {
return d.db.Model(d.newResultPointer()).ScanRows(rows, dest)
}
func (d DO) WithResult(fc func(tx Dao)) ResultInfo {
d.db = d.db.Set("", "")
fc(&d)
return ResultInfo{RowsAffected: d.db.RowsAffected, Error: d.db.Error}
}
func (d *DO) newResultPointer() interface{} {
if d.backfillData != nil {
return d.backfillData
}
if d.modelType == nil {
return nil
}
return reflect.New(d.modelType).Interface()
}
func (d *DO) newResultSlicePointer() interface{} {
return reflect.New(reflect.SliceOf(reflect.PtrTo(d.modelType))).Interface()
}
func toColExprFullName(stmt *gorm.Statement, columns ...field.Expr) []string {
return buildColExpr(stmt, columns, field.WithAll)
}
func getColumnName(columns ...field.Expr) (result []string) {
for _, c := range columns {
result = append(result, c.ColumnName().String())
}
return result
}
func buildColExpr(stmt *gorm.Statement, cols []field.Expr, opts ...field.BuildOpt) []string {
results := make([]string, len(cols))
for i, c := range cols {
switch c.RawExpr().(type) {
case clause.Column:
results[i] = c.BuildColumn(stmt, opts...).String()
case clause.Expression:
sql, args := c.BuildWithArgs(stmt)
results[i] = stmt.Dialector.Explain(sql.String(), args...)
}
}
return results
}
func buildExpr(stmt *gorm.Statement, exprs ...field.Expr) (query []string, args []interface{}) {
for _, e := range exprs {
sql, vars := e.BuildWithArgs(stmt)
query = append(query, sql.String())
args = append(args, vars...)
}
return query, args
}
func toExpression(exprs ...field.Expr) []clause.Expression {
result := make([]clause.Expression, len(exprs))
for i, e := range exprs {
result[i] = singleExpr(e)
}
return result
}
func toExpressionInterface(exprs ...field.Expr) []interface{} {
result := make([]interface{}, len(exprs))
for i, e := range exprs {
result[i] = singleExpr(e)
}
return result
}
func singleExpr(e field.Expr) clause.Expression {
switch v := e.RawExpr().(type) {
case clause.Expression:
return v
case clause.Column:
return clause.NamedExpr{SQL: "?", Vars: []interface{}{v}}
default:
return clause.Expr{}
}
}
func toInterfaceSlice(value interface{}) []interface{} {
switch v := value.(type) {
case string:
return []interface{}{v}
case []string:
res := make([]interface{}, len(v))
for i, item := range v {
res[i] = item
}
return res
case []clause.Column:
res := make([]interface{}, len(v))
for i, item := range v {
res[i] = item
}
return res
default:
return nil
}
}
// ======================== New Table ========================
// Table return a new table produced by subquery,
// the return value has to be used as root node
//
// Table(u.Select(u.ID, u.Name).Where(u.Age.Gt(18))).Select()
// the above usage is equivalent to SQL statement:
// SELECT * FROM (SELECT `id`, `name` FROM `users_info` WHERE `age` > ?)"
func Table(subQueries ...subQuery) Dao {
if len(subQueries) == 0 {
return &DO{}
}
tablePlaceholder := make([]string, len(subQueries))
tableExprs := make([]interface{}, len(subQueries))
for i, query := range subQueries {
tablePlaceholder[i] = "(?)"
do := query.underlyingDO()
tableExprs[i] = do.db
if do.alias != "" {
tablePlaceholder[i] += " AS " + do.Quote(do.alias)
}
}
return &DO{
db: subQueries[0].underlyingDO().db.Session(&gorm.Session{NewDB: true}).
Table(strings.Join(tablePlaceholder, ", "), tableExprs...),
}
}
// ======================== sub query method ========================
type columns []field.Expr
// Set assign value by subquery
func (cs columns) Set(query subQuery) field.AssignExpr {
return field.AssignSubQuery(cs, query.underlyingDB())
}
// In accept query or value
func (cs columns) In(queryOrValue Condition) field.Expr {
if len(cs) == 0 {
return field.EmptyExpr()
}
switch query := queryOrValue.(type) {
case field.Value:
return field.ContainsValue(cs, query)
case subQuery:
return field.ContainsSubQuery(cs, query.underlyingDB())
default:
return field.EmptyExpr()
}
}
func (cs columns) NotIn(queryOrValue Condition) field.Expr {
return field.Not(cs.In(queryOrValue))
}
func (cs columns) Eq(query subQuery) field.Expr {
if len(cs) == 0 {
return field.EmptyExpr()
}
return field.CompareSubQuery(field.EqOp, cs[0], query.underlyingDB())
}
func (cs columns) Neq(query subQuery) field.Expr {
if len(cs) == 0 {
return field.EmptyExpr()
}
return field.CompareSubQuery(field.NeqOp, cs[0], query.underlyingDB())
}
func (cs columns) Gt(query subQuery) field.Expr {
if len(cs) == 0 {
return field.EmptyExpr()
}
return field.CompareSubQuery(field.GtOp, cs[0], query.underlyingDB())
}
func (cs columns) Gte(query subQuery) field.Expr {
if len(cs) == 0 {
return field.EmptyExpr()
}
return field.CompareSubQuery(field.GteOp, cs[0], query.underlyingDB())
}
func (cs columns) Lt(query subQuery) field.Expr {
if len(cs) == 0 {
return field.EmptyExpr()
}
return field.CompareSubQuery(field.LtOp, cs[0], query.underlyingDB())
}
func (cs columns) Lte(query subQuery) field.Expr {
if len(cs) == 0 {
return field.EmptyExpr()
}
return field.CompareSubQuery(field.LteOp, cs[0], query.underlyingDB())
}