forked from vitessio/vitess
/
insert.go
232 lines (221 loc) · 7.95 KB
/
insert.go
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// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package planbuilder
import (
"errors"
"fmt"
"strconv"
"github.com/youtube/vitess/go/vt/sqlparser"
"github.com/youtube/vitess/go/vt/vtgate/engine"
"github.com/youtube/vitess/go/vt/vtgate/vindexes"
)
// buildInsertPlan builds the route for an INSERT statement.
func buildInsertPlan(ins *sqlparser.Insert, vschema VSchema) (*engine.Route, error) {
table, err := vschema.Find(ins.Table.Qualifier, ins.Table.Name)
if err != nil {
return nil, err
}
if !table.Keyspace.Sharded {
return buildInsertUnshardedPlan(ins, table, vschema)
}
return buildInsertShardedPlan(ins, table)
}
func buildInsertUnshardedPlan(ins *sqlparser.Insert, table *vindexes.Table, vschema VSchema) (*engine.Route, error) {
eRoute := &engine.Route{
Opcode: engine.InsertUnsharded,
Table: table,
Keyspace: table.Keyspace,
}
var values sqlparser.Values
switch rows := ins.Rows.(type) {
case *sqlparser.Union:
return nil, errors.New("unsupported: union in insert")
case *sqlparser.Select:
bldr, err := processSelect(rows, vschema, nil)
if err != nil {
return nil, err
}
innerRoute, ok := bldr.(*route)
if !ok {
return nil, errors.New("unsupported: complex join in insert")
}
if innerRoute.ERoute.Keyspace.Name != eRoute.Keyspace.Name {
return nil, errors.New("unsupported: cross-keyspace select in insert")
}
if eRoute.Table.AutoIncrement != nil {
return nil, errors.New("unsupported: auto-inc and select in insert")
}
eRoute.Query = generateQuery(ins)
return eRoute, nil
case sqlparser.Values:
values = rows
if hasSubquery(values) {
return nil, errors.New("unsupported: subquery in insert values")
}
default:
panic("unexpected construct in insert")
}
if eRoute.Table.AutoIncrement == nil {
eRoute.Query = generateQuery(ins)
return eRoute, nil
}
if len(ins.Columns) == 0 {
return nil, errors.New("column list required for tables with auto-inc columns")
}
for _, value := range values {
if len(ins.Columns) != len(value) {
return nil, errors.New("column list doesn't match values")
}
}
autoIncValues := make([]interface{}, 0, len(values))
for rowNum := range values {
autoIncVal, err := handleAutoinc(ins, eRoute.Table.AutoIncrement, rowNum)
if err != nil {
return nil, err
}
autoIncValues = append(autoIncValues, autoIncVal)
}
if eRoute.Table.AutoIncrement != nil {
eRoute.Generate = &engine.Generate{
Opcode: engine.SelectUnsharded,
Keyspace: eRoute.Table.AutoIncrement.Sequence.Keyspace,
Query: fmt.Sprintf("select next :n values from %s", sqlparser.String(eRoute.Table.AutoIncrement.Sequence.Name)),
Value: autoIncValues,
}
}
eRoute.Query = generateQuery(ins)
return eRoute, nil
}
func buildInsertShardedPlan(ins *sqlparser.Insert, table *vindexes.Table) (*engine.Route, error) {
eRoute := &engine.Route{
Opcode: engine.InsertSharded,
Table: table,
Keyspace: table.Keyspace,
}
if len(ins.Columns) == 0 {
return nil, errors.New("no column list")
}
var values sqlparser.Values
switch rows := ins.Rows.(type) {
case *sqlparser.Select, *sqlparser.Union:
return nil, errors.New("unsupported: insert into select")
case sqlparser.Values:
values = rows
if hasSubquery(values) {
return nil, errors.New("unsupported: subquery in insert values")
}
default:
panic("unexpected construct in insert")
}
for _, value := range values {
if len(ins.Columns) != len(value) {
return nil, errors.New("column list doesn't match values")
}
}
colVindexes := eRoute.Table.ColumnVindexes
routeValues := make([]interface{}, 0, len(values))
autoIncValues := make([]interface{}, 0, len(values))
for rowNum := range values {
rowValue := make([]interface{}, 0, len(colVindexes))
for _, index := range colVindexes {
row, pos := findOrInsertPos(ins, index.Column, rowNum)
value, err := handleVindexCol(index, rowNum, row, pos)
if err != nil {
return nil, err
}
rowValue = append(rowValue, value)
}
if eRoute.Table.AutoIncrement != nil {
autoIncVal, value, err := handleShardedAutoinc(ins, eRoute.Table.AutoIncrement, rowValue, rowNum)
if err != nil {
return nil, err
}
rowValue = value
autoIncValues = append(autoIncValues, autoIncVal)
}
routeValues = append(routeValues, rowValue)
}
if eRoute.Table.AutoIncrement != nil {
eRoute.Generate = &engine.Generate{
Opcode: engine.SelectUnsharded,
Keyspace: eRoute.Table.AutoIncrement.Sequence.Keyspace,
Query: fmt.Sprintf("select next :n values from %s", sqlparser.String(eRoute.Table.AutoIncrement.Sequence.Name)),
Value: autoIncValues,
}
}
eRoute.Values = routeValues
eRoute.Query = generateQuery(ins)
generateInsertShardedQuery(ins, eRoute, values)
return eRoute, nil
}
func generateInsertShardedQuery(node *sqlparser.Insert, eRoute *engine.Route, valueTuples sqlparser.Values) {
prefixBuf := sqlparser.NewTrackedBuffer(dmlFormatter)
midBuf := sqlparser.NewTrackedBuffer(dmlFormatter)
suffixBuf := sqlparser.NewTrackedBuffer(dmlFormatter)
eRoute.Mid = make([]string, len(valueTuples))
prefixBuf.Myprintf("insert %v%sinto %v%v values ",
node.Comments, node.Ignore,
node.Table, node.Columns)
eRoute.Prefix = prefixBuf.String()
for rowNum, val := range valueTuples {
midBuf.Myprintf("%v", val)
eRoute.Mid[rowNum] = midBuf.String()
midBuf.Truncate(0)
}
suffixBuf.Myprintf("%v", node.OnDup)
eRoute.Suffix = suffixBuf.String()
}
// handleVindexCol substitutes the insert value with a bind var name and returns
// the converted value, which will be used at the time of insert to validate the vindex value.
func handleVindexCol(colVindex *vindexes.ColumnVindex, rowNum int, row sqlparser.ValTuple, pos int) (interface{}, error) {
val, err := valConvert(row[pos])
if err != nil {
return val, fmt.Errorf("could not convert val: %s, pos: %d: %v", sqlparser.String(row[pos]), pos, err)
}
row[pos] = sqlparser.NewValArg([]byte(":_" + colVindex.Column.CompliantName() + strconv.Itoa(rowNum)))
return val, nil
}
// handleShardedAutoinc substitutes the insert value with a bind var and returns
// the converted value, which will be used at the time of decide if a new value should be generated.
// This is for a sharded keyspace which also needs to take care of an additional redirect.
func handleShardedAutoinc(ins *sqlparser.Insert, autoinc *vindexes.AutoIncrement, rowValue []interface{}, rowNum int) (interface{}, []interface{}, error) {
// If it's also a colvindex, we have to add a redirect from route.Values.
// Otherwise, we have to redirect from row[pos].
if autoinc.ColumnVindexNum >= 0 {
val := rowValue[autoinc.ColumnVindexNum]
rowValue[autoinc.ColumnVindexNum] = ":" + engine.SeqVarName + strconv.Itoa(rowNum)
return val, rowValue, nil
}
val, err := handleAutoinc(ins, autoinc, rowNum)
return val, rowValue, err
}
// handleAutoinc substitutes the insert value with a bind var and returns
// the converted value, which will be used at the time of decide if a new value should be generated.
// This works for columns with no vindexes.
func handleAutoinc(ins *sqlparser.Insert, autoinc *vindexes.AutoIncrement, rowNum int) (interface{}, error) {
row, pos := findOrInsertPos(ins, autoinc.Column, rowNum)
val, err := valConvert(row[pos])
if err != nil {
return nil, fmt.Errorf("could not convert val: %s, pos: %d: %v", sqlparser.String(row[pos]), pos, err)
}
row[pos] = sqlparser.NewValArg([]byte(":" + engine.SeqVarName + strconv.Itoa(rowNum)))
return val, nil
}
func findOrInsertPos(ins *sqlparser.Insert, col sqlparser.ColIdent, rowNum int) (row sqlparser.ValTuple, pos int) {
pos = -1
for i, column := range ins.Columns {
if col.Equal(column) {
pos = i
break
}
}
if pos == -1 {
pos = len(ins.Columns)
ins.Columns = append(ins.Columns, col)
}
if pos >= len(ins.Rows.(sqlparser.Values)[rowNum]) {
ins.Rows.(sqlparser.Values)[rowNum] = append(ins.Rows.(sqlparser.Values)[rowNum], &sqlparser.NullVal{})
}
return ins.Rows.(sqlparser.Values)[rowNum], pos
}