mirror of https://github.com/go-gorm/gorm.git
112 lines
3.2 KiB
Go
112 lines
3.2 KiB
Go
package callbacks
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import (
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"reflect"
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"github.com/jinzhu/gorm"
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"github.com/jinzhu/gorm/clause"
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"github.com/jinzhu/gorm/schema"
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)
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func BeforeDelete(db *gorm.DB) {
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if db.Error == nil && db.Statement.Schema != nil && db.Statement.Schema.BeforeDelete {
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tx := db.Session(&gorm.Session{})
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callMethod := func(value interface{}) bool {
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if db.Statement.Schema.BeforeDelete {
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if i, ok := value.(gorm.BeforeDeleteInterface); ok {
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db.AddError(i.BeforeDelete(tx))
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return true
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}
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}
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return false
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}
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if ok := callMethod(db.Statement.Dest); !ok {
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switch db.Statement.ReflectValue.Kind() {
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case reflect.Slice, reflect.Array:
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for i := 0; i < db.Statement.ReflectValue.Len(); i++ {
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callMethod(db.Statement.ReflectValue.Index(i).Interface())
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}
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case reflect.Struct:
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callMethod(db.Statement.ReflectValue.Interface())
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}
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}
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}
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}
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func Delete(db *gorm.DB) {
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if db.Error == nil {
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if db.Statement.Schema != nil && !db.Statement.Unscoped {
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for _, c := range db.Statement.Schema.DeleteClauses {
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db.Statement.AddClause(c)
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}
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}
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if db.Statement.SQL.String() == "" {
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db.Statement.AddClauseIfNotExists(clause.Delete{})
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if db.Statement.Schema != nil {
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_, queryValues := schema.GetIdentityFieldValuesMap(db.Statement.ReflectValue, db.Statement.Schema.PrimaryFields)
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column, values := schema.ToQueryValues(db.Statement.Schema.PrimaryFieldDBNames, queryValues)
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if len(values) > 0 {
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db.Statement.AddClause(clause.Where{Exprs: []clause.Expression{clause.IN{Column: column, Values: values}}})
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}
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if db.Statement.Dest != db.Statement.Model && db.Statement.Model != nil {
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_, queryValues = schema.GetIdentityFieldValuesMap(reflect.ValueOf(db.Statement.Model), db.Statement.Schema.PrimaryFields)
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column, values = schema.ToQueryValues(db.Statement.Schema.PrimaryFieldDBNames, queryValues)
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if len(values) > 0 {
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db.Statement.AddClause(clause.Where{Exprs: []clause.Expression{clause.IN{Column: column, Values: values}}})
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}
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}
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}
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if _, ok := db.Statement.Clauses["WHERE"]; !ok {
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db.AddError(gorm.ErrMissingWhereClause)
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return
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}
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db.Statement.AddClauseIfNotExists(clause.From{})
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db.Statement.Build("DELETE", "FROM", "WHERE")
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}
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if !db.DryRun {
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result, err := db.Statement.ConnPool.ExecContext(db.Statement.Context, db.Statement.SQL.String(), db.Statement.Vars...)
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if err == nil {
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db.RowsAffected, _ = result.RowsAffected()
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} else {
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db.AddError(err)
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}
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}
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}
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}
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func AfterDelete(db *gorm.DB) {
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if db.Error == nil && db.Statement.Schema != nil && db.Statement.Schema.AfterDelete {
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tx := db.Session(&gorm.Session{})
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callMethod := func(value interface{}) bool {
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if db.Statement.Schema.AfterDelete {
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if i, ok := value.(gorm.AfterDeleteInterface); ok {
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db.AddError(i.AfterDelete(tx))
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return true
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}
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}
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return false
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}
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if ok := callMethod(db.Statement.Dest); !ok {
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switch db.Statement.ReflectValue.Kind() {
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case reflect.Slice, reflect.Array:
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for i := 0; i < db.Statement.ReflectValue.Len(); i++ {
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callMethod(db.Statement.ReflectValue.Index(i).Interface())
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}
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case reflect.Struct:
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callMethod(db.Statement.ReflectValue.Interface())
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}
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}
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}
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}
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