117 lines
3.5 KiB
Go
117 lines
3.5 KiB
Go
// Copyright 2023 The Xorm Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package statements
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import (
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"errors"
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"fmt"
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"time"
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"xorm.io/builder"
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"xorm.io/xorm/internal/utils"
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"xorm.io/xorm/schemas"
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)
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func (statement *Statement) writeDeleteOrder(w builder.Writer) error {
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if err := statement.WriteOrderBy(w); err != nil {
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return err
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}
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if statement.LimitN != nil && *statement.LimitN > 0 {
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limitNValue := *statement.LimitN
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if _, err := fmt.Fprintf(w, " LIMIT %d", limitNValue); err != nil {
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return err
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}
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}
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return nil
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}
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// ErrNotImplemented not implemented
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var ErrNotImplemented = errors.New("Not implemented")
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func (statement *Statement) writeOrderCond(orderCondWriter builder.Writer, condWriter, orderSQLWriter *builder.BytesWriter, tableName string) error {
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if orderSQLWriter.Len() > 0 {
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switch statement.dialect.URI().DBType {
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case schemas.POSTGRES:
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if condWriter.Len() > 0 {
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fmt.Fprintf(orderCondWriter, " AND ")
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} else {
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fmt.Fprintf(orderCondWriter, " WHERE ")
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}
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fmt.Fprintf(orderCondWriter, "ctid IN (SELECT ctid FROM %s%s)", tableName, orderSQLWriter.String())
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orderCondWriter.Append(orderSQLWriter.Args()...)
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case schemas.SQLITE:
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if condWriter.Len() > 0 {
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fmt.Fprintf(orderCondWriter, " AND ")
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} else {
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fmt.Fprintf(orderCondWriter, " WHERE ")
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}
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fmt.Fprintf(orderCondWriter, "rowid IN (SELECT rowid FROM %s%s)", tableName, orderSQLWriter.String())
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// TODO: how to handle delete limit on mssql?
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case schemas.MSSQL:
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return ErrNotImplemented
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default:
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fmt.Fprint(orderCondWriter, orderSQLWriter.String())
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orderCondWriter.Append(orderSQLWriter.Args()...)
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}
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}
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return nil
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}
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func (statement *Statement) WriteDelete(realSQLWriter, deleteSQLWriter *builder.BytesWriter, nowTime func(*schemas.Column) (interface{}, time.Time, error)) error {
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var (
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condWriter = builder.NewWriter()
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err error
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)
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if err = statement.Conds().WriteTo(statement.QuoteReplacer(condWriter)); err != nil {
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return err
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}
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tableNameNoQuote := statement.TableName()
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tableName := statement.dialect.Quoter().Quote(tableNameNoQuote)
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table := statement.RefTable
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fmt.Fprintf(deleteSQLWriter, "DELETE FROM %v", tableName)
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if condWriter.Len() > 0 {
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fmt.Fprintf(deleteSQLWriter, " WHERE %v", condWriter.String())
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deleteSQLWriter.Append(condWriter.Args()...)
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}
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orderSQLWriter := builder.NewWriter()
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if err := statement.writeDeleteOrder(orderSQLWriter); err != nil {
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return err
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}
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orderCondWriter := builder.NewWriter()
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if err := statement.writeOrderCond(orderCondWriter, condWriter, orderSQLWriter, tableName); err != nil {
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return err
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}
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argsForCache := make([]interface{}, 0, len(deleteSQLWriter.Args())*2)
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copy(argsForCache, deleteSQLWriter.Args())
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argsForCache = append(deleteSQLWriter.Args(), argsForCache...)
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if statement.GetUnscoped() || table == nil || table.DeletedColumn() == nil { // tag "deleted" is disabled
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return utils.WriteBuilder(realSQLWriter, deleteSQLWriter, orderCondWriter)
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}
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deletedColumn := table.DeletedColumn()
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if _, err := fmt.Fprintf(realSQLWriter, "UPDATE %v SET %v = ? WHERE %v",
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statement.dialect.Quoter().Quote(statement.TableName()),
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statement.dialect.Quoter().Quote(deletedColumn.Name),
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condWriter.String()); err != nil {
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return err
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}
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val, _, err := nowTime(deletedColumn)
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if err != nil {
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return err
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}
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realSQLWriter.Append(val)
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realSQLWriter.Append(condWriter.Args()...)
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return utils.WriteBuilder(realSQLWriter, orderCondWriter)
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}
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