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// Copyright 2016 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xorm
import (
"errors"
"fmt"
"strconv"
"xorm.io/xorm/caches"
"xorm.io/xorm/schemas"
)
var (
// ErrNeedDeletedCond delete needs less one condition error
ErrNeedDeletedCond = errors.New("Delete action needs at least one condition")
// ErrNotImplemented not implemented
ErrNotImplemented = errors.New("Not implemented")
)
func (session *Session) cacheDelete(table *schemas.Table, tableName, sqlStr string, args ...interface{}) error {
if table == nil ||
session.tx != nil {
return ErrCacheFailed
}
for _, filter := range session.engine.dialect.Filters() {
sqlStr = filter.Do(sqlStr)
}
newsql := session.statement.ConvertIDSQL(sqlStr)
if newsql == "" {
return ErrCacheFailed
}
cacher := session.engine.cacherMgr.GetCacher(tableName)
pkColumns := table.PKColumns()
ids, err := caches.GetCacheSql(cacher, tableName, newsql, args)
if err != nil {
resultsSlice, err := session.queryBytes(newsql, args...)
if err != nil {
return err
}
ids = make([]schemas.PK, 0)
if len(resultsSlice) > 0 {
for _, data := range resultsSlice {
var id int64
var pk schemas.PK = make([]interface{}, 0)
for _, col := range pkColumns {
if v, ok := data[col.Name]; !ok {
return errors.New("no id")
} else if col.SQLType.IsText() {
pk = append(pk, string(v))
} else if col.SQLType.IsNumeric() {
id, err = strconv.ParseInt(string(v), 10, 64)
if err != nil {
return err
}
pk = append(pk, id)
} else {
return errors.New("not supported primary key type")
}
}
ids = append(ids, pk)
}
}
}
for _, id := range ids {
session.engine.logger.Debugf("[cache] delete cache obj: %v, %v", tableName, id)
sid, err := id.ToString()
if err != nil {
return err
}
cacher.DelBean(tableName, sid)
}
session.engine.logger.Debugf("[cache] clear cache table: %v", tableName)
cacher.ClearIds(tableName)
return nil
}
// Delete records, bean's non-empty fields are conditions
func (session *Session) Delete(bean interface{}) (int64, error) {
if session.isAutoClose {
defer session.Close()
}
if session.statement.LastError != nil {
return 0, session.statement.LastError
}
if err := session.statement.SetRefBean(bean); err != nil {
return 0, err
}
executeBeforeClosures(session, bean)
if processor, ok := interface{}(bean).(BeforeDeleteProcessor); ok {
processor.BeforeDelete()
}
condSQL, condArgs, err := session.statement.GenConds(bean)
if err != nil {
return 0, err
}
pLimitN := session.statement.LimitN
if len(condSQL) == 0 && (pLimitN == nil || *pLimitN == 0) {
return 0, ErrNeedDeletedCond
}
var tableNameNoQuote = session.statement.TableName()
var tableName = session.engine.Quote(tableNameNoQuote)
var table = session.statement.RefTable
var deleteSQL string
if len(condSQL) > 0 {
deleteSQL = fmt.Sprintf("DELETE FROM %v WHERE %v", tableName, condSQL)
} else {
deleteSQL = fmt.Sprintf("DELETE FROM %v", tableName)
}
var orderSQL string
if len(session.statement.OrderStr) > 0 {
orderSQL += fmt.Sprintf(" ORDER BY %s", session.statement.OrderStr)
}
if pLimitN != nil && *pLimitN > 0 {
limitNValue := *pLimitN
orderSQL += fmt.Sprintf(" LIMIT %d", limitNValue)
}
if len(orderSQL) > 0 {
switch session.engine.dialect.URI().DBType {
case schemas.POSTGRES:
inSQL := fmt.Sprintf("ctid IN (SELECT ctid FROM %s%s)", tableName, orderSQL)
if len(condSQL) > 0 {
deleteSQL += " AND " + inSQL
} else {
deleteSQL += " WHERE " + inSQL
}
case schemas.SQLITE:
inSQL := fmt.Sprintf("rowid IN (SELECT rowid FROM %s%s)", tableName, orderSQL)
if len(condSQL) > 0 {
deleteSQL += " AND " + inSQL
} else {
deleteSQL += " WHERE " + inSQL
}
// TODO: how to handle delete limit on mssql?
case schemas.MSSQL:
return 0, ErrNotImplemented
default:
deleteSQL += orderSQL
}
}
var realSQL string
argsForCache := make([]interface{}, 0, len(condArgs)*2)
if session.statement.GetUnscoped() || table.DeletedColumn() == nil { // tag "deleted" is disabled
realSQL = deleteSQL
copy(argsForCache, condArgs)
argsForCache = append(condArgs, argsForCache...)
} else {
// !oinume! sqlStrForCache and argsForCache is needed to behave as executing "DELETE FROM ..." for caches.
copy(argsForCache, condArgs)
argsForCache = append(condArgs, argsForCache...)
deletedColumn := table.DeletedColumn()
realSQL = fmt.Sprintf("UPDATE %v SET %v = ? WHERE %v",
session.engine.Quote(session.statement.TableName()),
session.engine.Quote(deletedColumn.Name),
condSQL)
if len(orderSQL) > 0 {
switch session.engine.dialect.URI().DBType {
case schemas.POSTGRES:
inSQL := fmt.Sprintf("ctid IN (SELECT ctid FROM %s%s)", tableName, orderSQL)
if len(condSQL) > 0 {
realSQL += " AND " + inSQL
} else {
realSQL += " WHERE " + inSQL
}
case schemas.SQLITE:
inSQL := fmt.Sprintf("rowid IN (SELECT rowid FROM %s%s)", tableName, orderSQL)
if len(condSQL) > 0 {
realSQL += " AND " + inSQL
} else {
realSQL += " WHERE " + inSQL
}
// TODO: how to handle delete limit on mssql?
case schemas.MSSQL:
return 0, ErrNotImplemented
default:
realSQL += orderSQL
}
}
// !oinume! Insert nowTime to the head of session.statement.Params
condArgs = append(condArgs, "")
paramsLen := len(condArgs)
copy(condArgs[1:paramsLen], condArgs[0:paramsLen-1])
val, t := session.engine.nowTime(deletedColumn)
condArgs[0] = val
var colName = deletedColumn.Name
session.afterClosures = append(session.afterClosures, func(bean interface{}) {
col := table.GetColumn(colName)
setColumnTime(bean, col, t)
})
}
if cacher := session.engine.GetCacher(tableNameNoQuote); cacher != nil && session.statement.UseCache {
session.cacheDelete(table, tableNameNoQuote, deleteSQL, argsForCache...)
}
session.statement.RefTable = table
res, err := session.exec(realSQL, condArgs...)
if err != nil {
return 0, err
}
// handle after delete processors
if session.isAutoCommit {
for _, closure := range session.afterClosures {
closure(bean)
}
if processor, ok := interface{}(bean).(AfterDeleteProcessor); ok {
processor.AfterDelete()
}
} else {
lenAfterClosures := len(session.afterClosures)
if lenAfterClosures > 0 {
if value, has := session.afterDeleteBeans[bean]; has && value != nil {
*value = append(*value, session.afterClosures...)
} else {
afterClosures := make([]func(interface{}), lenAfterClosures)
copy(afterClosures, session.afterClosures)
session.afterDeleteBeans[bean] = &afterClosures
}
} else {
if _, ok := interface{}(bean).(AfterDeleteProcessor); ok {
session.afterDeleteBeans[bean] = nil
}
}
}
cleanupProcessorsClosures(&session.afterClosures)
// --
return res.RowsAffected()
}