forked from pingcap/tidb
/
insert.go
345 lines (294 loc) · 9.43 KB
/
insert.go
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// 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 stmts
import (
"github.com/juju/errors"
"github.com/pingcap/tidb/column"
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/expression"
"github.com/pingcap/tidb/expression/expressions"
"github.com/pingcap/tidb/kv"
mysql "github.com/pingcap/tidb/mysqldef"
"github.com/pingcap/tidb/rset"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/stmt"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/util/errors2"
"github.com/pingcap/tidb/util/format"
"github.com/pingcap/tidb/util/types"
)
var _ stmt.Statement = (*InsertIntoStmt)(nil)
// Priority const values.
// See: https://dev.mysql.com/doc/refman/5.7/en/insert.html
const (
NoPriority = iota
LowPriority
HighPriority
DelayedPriority
)
// InsertIntoStmt is a statement to insert new rows into an existing table.
// See: https://dev.mysql.com/doc/refman/5.7/en/insert.html
type InsertIntoStmt struct {
ColNames []string
Lists [][]expression.Expression
Sel *SelectStmt
TableIdent table.Ident
Setlist []*expressions.Assignment
Priority int
OnDuplicate []expressions.Assignment
Text string
}
// Explain implements the stmt.Statement Explain interface.
func (s *InsertIntoStmt) Explain(ctx context.Context, w format.Formatter) {
w.Format("%s\n", s.Text)
}
// IsDDL implements the stmt.Statement IsDDL interface.
func (s *InsertIntoStmt) IsDDL() bool {
return false
}
// OriginText implements the stmt.Statement OriginText interface.
func (s *InsertIntoStmt) OriginText() string {
return s.Text
}
// SetText implements the stmt.Statement SetText interface.
func (s *InsertIntoStmt) SetText(text string) {
s.Text = text
}
// execExecSelect implements `insert table select ... from ...`.
func (s *InsertIntoStmt) execSelect(t table.Table, cols []*column.Col, ctx context.Context) (_ rset.Recordset, err error) {
r, err := s.Sel.Plan(ctx)
if err != nil {
return nil, errors.Trace(err)
} else if len(r.GetFields()) != len(cols) {
return nil, errors.Errorf("Column count %d doesn't match value count %d", len(cols), len(r.GetFields()))
}
var bufRecords [][]interface{}
var lastInsertIds []uint64
err = r.Do(ctx, func(_ interface{}, data []interface{}) (more bool, err error) {
data0 := make([]interface{}, len(t.Cols()))
marked := make(map[int]struct{}, len(cols))
for i, d := range data {
data0[cols[i].Offset] = d
marked[cols[i].Offset] = struct{}{}
}
if err = s.initDefaultValues(ctx, t, t.Cols(), data0, marked); err != nil {
return false, errors.Trace(err)
}
if err = column.CastValues(ctx, data0, cols); err != nil {
return false, errors.Trace(err)
}
if err = column.CheckNotNull(t.Cols(), data0); err != nil {
return false, errors.Trace(err)
}
v, err := types.Clone(data0)
if err != nil {
return false, errors.Trace(err)
}
bufRecords = append(bufRecords, v.([]interface{}))
lastInsertIds = append(lastInsertIds, variable.GetSessionVars(ctx).LastInsertID)
return true, nil
})
if err != nil {
return nil, errors.Trace(err)
}
for i, r := range bufRecords {
variable.GetSessionVars(ctx).SetLastInsertID(lastInsertIds[i])
if _, err = t.AddRecord(ctx, r); err != nil {
return nil, errors.Trace(err)
}
}
return nil, nil
}
// There are three types of insert statements:
// 1 insert ... values(...) --> name type column
// 2 insert ... set x=y... --> set type column
// 3 insert ... (select ..) --> name type column
// See: https://dev.mysql.com/doc/refman/5.7/en/insert.html
func (s *InsertIntoStmt) getColumns(tableCols []*column.Col) ([]*column.Col, error) {
var cols []*column.Col
var err error
if len(s.Setlist) > 0 {
// Process `set` type column.
columns := make([]string, 0, len(s.Setlist))
for _, v := range s.Setlist {
columns = append(columns, v.ColName)
}
cols, err = column.FindCols(tableCols, columns)
if err != nil {
return nil, errors.Errorf("INSERT INTO %s: %s", s.TableIdent, err)
}
if len(cols) == 0 {
return nil, errors.Errorf("INSERT INTO %s: empty column", s.TableIdent)
}
} else {
// Process `name` type column.
cols, err = column.FindCols(tableCols, s.ColNames)
if err != nil {
return nil, errors.Errorf("INSERT INTO %s: %s", s.TableIdent, err)
}
// If cols are empty, use all columns instead.
if len(cols) == 0 {
cols = tableCols
}
}
// Check column whether is specified only once.
err = column.CheckOnce(cols)
if err != nil {
return nil, errors.Trace(err)
}
return cols, nil
}
// Exec implements the stmt.Statement Exec interface.
func (s *InsertIntoStmt) Exec(ctx context.Context) (_ rset.Recordset, err error) {
t, err := getTable(ctx, s.TableIdent)
if err != nil {
return nil, errors.Trace(err)
}
tableCols := t.Cols()
cols, err := s.getColumns(tableCols)
if err != nil {
return nil, errors.Trace(err)
}
// Process `insert ... (select ..) `
if s.Sel != nil {
return s.execSelect(t, cols, ctx)
}
// Process `insert ... set x=y...`
if len(s.Setlist) > 0 {
if len(s.Lists) > 0 {
return nil, errors.Errorf("INSERT INTO %s: set type should not use values", s.TableIdent)
}
var l []expression.Expression
for _, v := range s.Setlist {
l = append(l, v.Expr)
}
s.Lists = append(s.Lists, l)
}
m := map[interface{}]interface{}{}
for _, v := range tableCols {
var (
value interface{}
ok bool
)
value, ok, err = getDefaultValue(ctx, v)
if ok {
if err != nil {
return nil, errors.Trace(err)
}
m[v.Name.L] = value
}
}
insertValueCount := len(s.Lists[0])
for i, list := range s.Lists {
r := make([]interface{}, len(tableCols))
valueCount := len(list)
if insertValueCount != valueCount {
// "insert into t values (), ()" is valid.
// "insert into t values (), (1)" is not valid.
// "insert into t values (1), ()" is not valid.
// "insert into t values (1,2), (1)" is not valid.
// So the value count must be same for all insert list.
return nil, errors.Errorf("Column count doesn't match value count at row %d", i+1)
}
if valueCount == 0 && len(s.ColNames) > 0 {
// "insert into t (c1) values ()" is not valid.
return nil, errors.Errorf("INSERT INTO %s: expected %d value(s), have %d", s.TableIdent, len(s.ColNames), 0)
} else if valueCount > 0 && valueCount != len(cols) {
return nil, errors.Errorf("INSERT INTO %s: expected %d value(s), have %d", s.TableIdent, len(cols), valueCount)
}
// Clear last insert id.
variable.GetSessionVars(ctx).SetLastInsertID(0)
marked := make(map[int]struct{}, len(list))
for i, expr := range list {
// For "insert into t values (default)" Default Eval.
m[expressions.ExprEvalDefaultName] = cols[i].Name.O
val, evalErr := expr.Eval(ctx, m)
if evalErr != nil {
return nil, errors.Trace(evalErr)
}
r[cols[i].Offset] = val
marked[cols[i].Offset] = struct{}{}
}
if err := s.initDefaultValues(ctx, t, tableCols, r, marked); err != nil {
return nil, errors.Trace(err)
}
if err = column.CastValues(ctx, r, cols); err != nil {
return nil, errors.Trace(err)
}
if err = column.CheckNotNull(tableCols, r); err != nil {
return nil, errors.Trace(err)
}
// Notes: incompatible with mysql
// MySQL will set last insert id to the first row, as follows:
// `t(id int AUTO_INCREMENT, c1 int, PRIMARY KEY (id))`
// `insert t (c1) values(1),(2),(3);`
// Last insert id will be 1, not 3.
h, err := t.AddRecord(ctx, r)
if err == nil {
continue
}
if len(s.OnDuplicate) == 0 || !errors2.ErrorEqual(err, kv.ErrConditionNotMatch) {
return nil, errors.Trace(err)
}
// On duplicate key Update the duplicate row.
// Evaluate the updated value.
// TODO: report rows affected and last insert id.
toUpdateColumns, err := getUpdateColumns(t, s.OnDuplicate)
if err != nil {
return nil, errors.Trace(err)
}
data, err := t.Row(ctx, h)
if err != nil {
return nil, errors.Trace(err)
}
err = updateRecord(ctx, h, data, t, toUpdateColumns, s.OnDuplicate, r)
if err != nil {
return nil, errors.Trace(err)
}
}
return nil, nil
}
func (s *InsertIntoStmt) initDefaultValues(ctx context.Context, t table.Table, cols []*column.Col, row []interface{}, marked map[int]struct{}) error {
var err error
var defaultValueCols []*column.Col
for i, c := range cols {
if row[i] != nil {
// Column value is not nil, continue.
continue
}
// If the nil value is evaluated in insert list, we will use nil except auto increment column.
if _, ok := marked[i]; ok && !mysql.HasAutoIncrementFlag(c.Flag) && !mysql.HasTimestampFlag(c.Flag) {
continue
}
if mysql.HasAutoIncrementFlag(c.Flag) {
var id int64
if id, err = t.AllocAutoID(); err != nil {
return errors.Trace(err)
}
row[i] = id
variable.GetSessionVars(ctx).SetLastInsertID(uint64(id))
} else {
var value interface{}
value, _, err = getDefaultValue(ctx, c)
if err != nil {
return errors.Trace(err)
}
row[i] = value
}
defaultValueCols = append(defaultValueCols, c)
}
if err = column.CastValues(ctx, row, defaultValueCols); err != nil {
return errors.Trace(err)
}
return nil
}