gitroast/vendor/github.com/pingcap/tidb/executor/adapter.go

121 lines
2.6 KiB
Go
Raw Normal View History

// Copyright 2015 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 (
"github.com/juju/errors"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/optimizer/plan"
)
// recordSet wraps an executor, implements ast.RecordSet interface
type recordSet struct {
fields []*ast.ResultField
executor Executor
}
func (a *recordSet) Fields() ([]*ast.ResultField, error) {
return a.fields, nil
}
func (a *recordSet) Next() (*ast.Row, error) {
row, err := a.executor.Next()
if err != nil || row == nil {
return nil, errors.Trace(err)
}
return &ast.Row{Data: row.Data}, nil
}
func (a *recordSet) Close() error {
return a.executor.Close()
}
type statement struct {
is infoschema.InfoSchema
plan plan.Plan
}
func (a *statement) OriginText() string {
return ""
}
func (a *statement) SetText(text string) {
return
}
func (a *statement) IsDDL() bool {
return false
}
func (a *statement) Exec(ctx context.Context) (ast.RecordSet, error) {
b := newExecutorBuilder(ctx, a.is)
e := b.build(a.plan)
if b.err != nil {
return nil, errors.Trace(b.err)
}
if executorExec, ok := e.(*ExecuteExec); ok {
err := executorExec.Build()
if err != nil {
return nil, errors.Trace(err)
}
e = executorExec.StmtExec
}
if len(e.Fields()) == 0 {
// No result fields means no Recordset.
defer e.Close()
for {
row, err := e.Next()
if err != nil {
return nil, errors.Trace(err)
}
if row == nil {
// It's used to insert retry.
changeInsertValueForRetry(a.plan, e)
return nil, nil
}
}
}
fs := e.Fields()
for _, f := range fs {
if len(f.ColumnAsName.O) == 0 {
f.ColumnAsName = f.Column.Name
}
}
return &recordSet{
executor: e,
fields: fs,
}, nil
}
func changeInsertValueForRetry(p plan.Plan, e Executor) {
if v, ok := p.(*plan.Insert); ok {
var insertValue *InsertValues
if !v.IsReplace {
insertValue = e.(*InsertExec).InsertValues
} else {
insertValue = e.(*ReplaceExec).InsertValues
}
v.Columns = insertValue.Columns
v.Setlist = insertValue.Setlist
if len(v.Setlist) == 0 {
v.Lists = insertValue.Lists
}
}
}