mirror of
https://github.com/go-gitea/gitea
synced 2024-09-19 18:26:04 +00:00
206 lines
6.2 KiB
Go
206 lines
6.2 KiB
Go
|
// Copyright 2016 PingCAP, Inc.
|
||
|
//
|
||
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
// you may not use this file except in compliance with the License.
|
||
|
// You may obtain a copy of the License at
|
||
|
//
|
||
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
//
|
||
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
// See the License for the specific language governing permissions and
|
||
|
// limitations under the License.
|
||
|
|
||
|
package executor
|
||
|
|
||
|
import (
|
||
|
"strings"
|
||
|
|
||
|
"github.com/juju/errors"
|
||
|
"github.com/pingcap/tidb/ast"
|
||
|
"github.com/pingcap/tidb/context"
|
||
|
"github.com/pingcap/tidb/infoschema"
|
||
|
"github.com/pingcap/tidb/model"
|
||
|
"github.com/pingcap/tidb/mysql"
|
||
|
"github.com/pingcap/tidb/privilege"
|
||
|
"github.com/pingcap/tidb/sessionctx"
|
||
|
"github.com/pingcap/tidb/terror"
|
||
|
)
|
||
|
|
||
|
// DDLExec represents a DDL executor.
|
||
|
type DDLExec struct {
|
||
|
Statement ast.StmtNode
|
||
|
ctx context.Context
|
||
|
is infoschema.InfoSchema
|
||
|
done bool
|
||
|
}
|
||
|
|
||
|
// Fields implements Executor Fields interface.
|
||
|
func (e *DDLExec) Fields() []*ast.ResultField {
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
// Next implements Execution Next interface.
|
||
|
func (e *DDLExec) Next() (*Row, error) {
|
||
|
if e.done {
|
||
|
return nil, nil
|
||
|
}
|
||
|
var err error
|
||
|
switch x := e.Statement.(type) {
|
||
|
case *ast.TruncateTableStmt:
|
||
|
err = e.executeTruncateTable(x)
|
||
|
case *ast.CreateDatabaseStmt:
|
||
|
err = e.executeCreateDatabase(x)
|
||
|
case *ast.CreateTableStmt:
|
||
|
err = e.executeCreateTable(x)
|
||
|
case *ast.CreateIndexStmt:
|
||
|
err = e.executeCreateIndex(x)
|
||
|
case *ast.DropDatabaseStmt:
|
||
|
err = e.executeDropDatabase(x)
|
||
|
case *ast.DropTableStmt:
|
||
|
err = e.executeDropTable(x)
|
||
|
case *ast.DropIndexStmt:
|
||
|
err = e.executeDropIndex(x)
|
||
|
case *ast.AlterTableStmt:
|
||
|
err = e.executeAlterTable(x)
|
||
|
}
|
||
|
if err != nil {
|
||
|
return nil, errors.Trace(err)
|
||
|
}
|
||
|
e.done = true
|
||
|
return nil, nil
|
||
|
}
|
||
|
|
||
|
// Close implements Executor Close interface.
|
||
|
func (e *DDLExec) Close() error {
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
func (e *DDLExec) executeTruncateTable(s *ast.TruncateTableStmt) error {
|
||
|
table, ok := e.is.TableByID(s.Table.TableInfo.ID)
|
||
|
if !ok {
|
||
|
return errors.New("table not found, should never happen")
|
||
|
}
|
||
|
return table.Truncate(e.ctx)
|
||
|
}
|
||
|
|
||
|
func (e *DDLExec) executeCreateDatabase(s *ast.CreateDatabaseStmt) error {
|
||
|
var opt *ast.CharsetOpt
|
||
|
if len(s.Options) != 0 {
|
||
|
opt = &ast.CharsetOpt{}
|
||
|
for _, val := range s.Options {
|
||
|
switch val.Tp {
|
||
|
case ast.DatabaseOptionCharset:
|
||
|
opt.Chs = val.Value
|
||
|
case ast.DatabaseOptionCollate:
|
||
|
opt.Col = val.Value
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
err := sessionctx.GetDomain(e.ctx).DDL().CreateSchema(e.ctx, model.NewCIStr(s.Name), opt)
|
||
|
if err != nil {
|
||
|
if terror.ErrorEqual(err, infoschema.DatabaseExists) && s.IfNotExists {
|
||
|
err = nil
|
||
|
}
|
||
|
}
|
||
|
return errors.Trace(err)
|
||
|
}
|
||
|
|
||
|
func (e *DDLExec) executeCreateTable(s *ast.CreateTableStmt) error {
|
||
|
ident := ast.Ident{Schema: s.Table.Schema, Name: s.Table.Name}
|
||
|
err := sessionctx.GetDomain(e.ctx).DDL().CreateTable(e.ctx, ident, s.Cols, s.Constraints, s.Options)
|
||
|
if terror.ErrorEqual(err, infoschema.TableExists) {
|
||
|
if s.IfNotExists {
|
||
|
return nil
|
||
|
}
|
||
|
return infoschema.TableExists.Gen("CREATE TABLE: table exists %s", ident)
|
||
|
}
|
||
|
return errors.Trace(err)
|
||
|
}
|
||
|
|
||
|
func (e *DDLExec) executeCreateIndex(s *ast.CreateIndexStmt) error {
|
||
|
ident := ast.Ident{Schema: s.Table.Schema, Name: s.Table.Name}
|
||
|
err := sessionctx.GetDomain(e.ctx).DDL().CreateIndex(e.ctx, ident, s.Unique, model.NewCIStr(s.IndexName), s.IndexColNames)
|
||
|
return errors.Trace(err)
|
||
|
}
|
||
|
|
||
|
func (e *DDLExec) executeDropDatabase(s *ast.DropDatabaseStmt) error {
|
||
|
err := sessionctx.GetDomain(e.ctx).DDL().DropSchema(e.ctx, model.NewCIStr(s.Name))
|
||
|
if terror.ErrorEqual(err, infoschema.DatabaseNotExists) {
|
||
|
if s.IfExists {
|
||
|
err = nil
|
||
|
} else {
|
||
|
err = infoschema.DatabaseDropExists.Gen("Can't drop database '%s'; database doesn't exist", s.Name)
|
||
|
}
|
||
|
}
|
||
|
return errors.Trace(err)
|
||
|
}
|
||
|
|
||
|
func (e *DDLExec) executeDropTable(s *ast.DropTableStmt) error {
|
||
|
var notExistTables []string
|
||
|
for _, tn := range s.Tables {
|
||
|
fullti := ast.Ident{Schema: tn.Schema, Name: tn.Name}
|
||
|
schema, ok := e.is.SchemaByName(tn.Schema)
|
||
|
if !ok {
|
||
|
// TODO: we should return special error for table not exist, checking "not exist" is not enough,
|
||
|
// because some other errors may contain this error string too.
|
||
|
notExistTables = append(notExistTables, fullti.String())
|
||
|
continue
|
||
|
}
|
||
|
tb, err := e.is.TableByName(tn.Schema, tn.Name)
|
||
|
if err != nil && strings.HasSuffix(err.Error(), "not exist") {
|
||
|
notExistTables = append(notExistTables, fullti.String())
|
||
|
continue
|
||
|
} else if err != nil {
|
||
|
return errors.Trace(err)
|
||
|
}
|
||
|
// Check Privilege
|
||
|
privChecker := privilege.GetPrivilegeChecker(e.ctx)
|
||
|
hasPriv, err := privChecker.Check(e.ctx, schema, tb.Meta(), mysql.DropPriv)
|
||
|
if err != nil {
|
||
|
return errors.Trace(err)
|
||
|
}
|
||
|
if !hasPriv {
|
||
|
return errors.Errorf("You do not have the privilege to drop table %s.%s.", tn.Schema, tn.Name)
|
||
|
}
|
||
|
|
||
|
err = sessionctx.GetDomain(e.ctx).DDL().DropTable(e.ctx, fullti)
|
||
|
if infoschema.DatabaseNotExists.Equal(err) || infoschema.TableNotExists.Equal(err) {
|
||
|
notExistTables = append(notExistTables, fullti.String())
|
||
|
} else if err != nil {
|
||
|
return errors.Trace(err)
|
||
|
}
|
||
|
}
|
||
|
if len(notExistTables) > 0 && !s.IfExists {
|
||
|
return infoschema.TableDropExists.Gen("DROP TABLE: table %s does not exist", strings.Join(notExistTables, ","))
|
||
|
}
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
func (e *DDLExec) executeDropIndex(s *ast.DropIndexStmt) error {
|
||
|
ti := ast.Ident{Schema: s.Table.Schema, Name: s.Table.Name}
|
||
|
err := sessionctx.GetDomain(e.ctx).DDL().DropIndex(e.ctx, ti, model.NewCIStr(s.IndexName))
|
||
|
if (infoschema.DatabaseNotExists.Equal(err) || infoschema.TableNotExists.Equal(err)) && s.IfExists {
|
||
|
err = nil
|
||
|
}
|
||
|
return errors.Trace(err)
|
||
|
}
|
||
|
|
||
|
func (e *DDLExec) executeAlterTable(s *ast.AlterTableStmt) error {
|
||
|
ti := ast.Ident{Schema: s.Table.Schema, Name: s.Table.Name}
|
||
|
err := sessionctx.GetDomain(e.ctx).DDL().AlterTable(e.ctx, ti, s.Specs)
|
||
|
return errors.Trace(err)
|
||
|
}
|
||
|
|
||
|
func joinColumnName(columnName *ast.ColumnName) string {
|
||
|
var originStrs []string
|
||
|
if columnName.Schema.O != "" {
|
||
|
originStrs = append(originStrs, columnName.Schema.O)
|
||
|
}
|
||
|
if columnName.Table.O != "" {
|
||
|
originStrs = append(originStrs, columnName.Table.O)
|
||
|
}
|
||
|
originStrs = append(originStrs, columnName.Name.O)
|
||
|
return strings.Join(originStrs, ".")
|
||
|
}
|