b6a95a8cb3
* Dropped unused codekit config * Integrated dynamic and static bindata for public * Ignore public bindata * Add a general generate make task * Integrated flexible public assets into web command * Updated vendoring, added all missiong govendor deps * Made the linter happy with the bindata and dynamic code * Moved public bindata definition to modules directory * Ignoring the new bindata path now * Updated to the new public modules import path * Updated public bindata command and drop the new prefix
979 lines
26 KiB
Go
979 lines
26 KiB
Go
// Copyright 2013 The ql Authors. All rights reserved.
|
||
// Use of this source code is governed by a BSD-style
|
||
// license that can be found in the LICENSES/QL-LICENSE file.
|
||
|
||
// 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 ddl
|
||
|
||
import (
|
||
"fmt"
|
||
"strings"
|
||
"sync"
|
||
"time"
|
||
|
||
"github.com/juju/errors"
|
||
"github.com/ngaut/log"
|
||
"github.com/pingcap/tidb/ast"
|
||
"github.com/pingcap/tidb/column"
|
||
"github.com/pingcap/tidb/context"
|
||
"github.com/pingcap/tidb/evaluator"
|
||
"github.com/pingcap/tidb/infoschema"
|
||
"github.com/pingcap/tidb/kv"
|
||
"github.com/pingcap/tidb/meta"
|
||
"github.com/pingcap/tidb/meta/autoid"
|
||
"github.com/pingcap/tidb/model"
|
||
"github.com/pingcap/tidb/mysql"
|
||
"github.com/pingcap/tidb/sessionctx/variable"
|
||
"github.com/pingcap/tidb/table"
|
||
"github.com/pingcap/tidb/util/charset"
|
||
"github.com/pingcap/tidb/util/types"
|
||
"github.com/twinj/uuid"
|
||
)
|
||
|
||
// DDL is responsible for updating schema in data store and maintaining in-memory InfoSchema cache.
|
||
type DDL interface {
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||
CreateSchema(ctx context.Context, name model.CIStr, charsetInfo *ast.CharsetOpt) error
|
||
DropSchema(ctx context.Context, schema model.CIStr) error
|
||
CreateTable(ctx context.Context, ident ast.Ident, cols []*ast.ColumnDef,
|
||
constrs []*ast.Constraint, options []*ast.TableOption) error
|
||
DropTable(ctx context.Context, tableIdent ast.Ident) (err error)
|
||
CreateIndex(ctx context.Context, tableIdent ast.Ident, unique bool, indexName model.CIStr,
|
||
columnNames []*ast.IndexColName) error
|
||
DropIndex(ctx context.Context, tableIdent ast.Ident, indexName model.CIStr) error
|
||
GetInformationSchema() infoschema.InfoSchema
|
||
AlterTable(ctx context.Context, tableIdent ast.Ident, spec []*ast.AlterTableSpec) error
|
||
// SetLease will reset the lease time for online DDL change,
|
||
// it's a very dangerous function and you must guarantee that all servers have the same lease time.
|
||
SetLease(lease time.Duration)
|
||
// GetLease returns current schema lease time.
|
||
GetLease() time.Duration
|
||
// Stats returns the DDL statistics.
|
||
Stats() (map[string]interface{}, error)
|
||
// GetScope gets the status variables scope.
|
||
GetScope(status string) variable.ScopeFlag
|
||
// Stop stops DDL worker.
|
||
Stop() error
|
||
// Start starts DDL worker.
|
||
Start() error
|
||
}
|
||
|
||
type ddl struct {
|
||
m sync.RWMutex
|
||
|
||
infoHandle *infoschema.Handle
|
||
hook Callback
|
||
store kv.Storage
|
||
// schema lease seconds.
|
||
lease time.Duration
|
||
uuid string
|
||
ddlJobCh chan struct{}
|
||
ddlJobDoneCh chan struct{}
|
||
// drop database/table job runs in the background.
|
||
bgJobCh chan struct{}
|
||
// reorgDoneCh is for reorganization, if the reorganization job is done,
|
||
// we will use this channel to notify outer.
|
||
// TODO: now we use goroutine to simulate reorganization jobs, later we may
|
||
// use a persistent job list.
|
||
reorgDoneCh chan error
|
||
|
||
quitCh chan struct{}
|
||
wait sync.WaitGroup
|
||
}
|
||
|
||
// NewDDL creates a new DDL.
|
||
func NewDDL(store kv.Storage, infoHandle *infoschema.Handle, hook Callback, lease time.Duration) DDL {
|
||
return newDDL(store, infoHandle, hook, lease)
|
||
}
|
||
|
||
func newDDL(store kv.Storage, infoHandle *infoschema.Handle, hook Callback, lease time.Duration) *ddl {
|
||
if hook == nil {
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||
hook = &BaseCallback{}
|
||
}
|
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d := &ddl{
|
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infoHandle: infoHandle,
|
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hook: hook,
|
||
store: store,
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||
lease: lease,
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||
uuid: uuid.NewV4().String(),
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||
ddlJobCh: make(chan struct{}, 1),
|
||
ddlJobDoneCh: make(chan struct{}, 1),
|
||
bgJobCh: make(chan struct{}, 1),
|
||
}
|
||
|
||
d.start()
|
||
|
||
variable.RegisterStatistics(d)
|
||
|
||
return d
|
||
}
|
||
|
||
func (d *ddl) Stop() error {
|
||
d.m.Lock()
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||
defer d.m.Unlock()
|
||
|
||
d.close()
|
||
|
||
err := kv.RunInNewTxn(d.store, true, func(txn kv.Transaction) error {
|
||
t := meta.NewMeta(txn)
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||
owner, err1 := t.GetDDLJobOwner()
|
||
if err1 != nil {
|
||
return errors.Trace(err1)
|
||
}
|
||
if owner == nil || owner.OwnerID != d.uuid {
|
||
return nil
|
||
}
|
||
|
||
// ddl job's owner is me, clean it so other servers can compete for it quickly.
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||
return t.SetDDLJobOwner(&model.Owner{})
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||
})
|
||
if err != nil {
|
||
return errors.Trace(err)
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||
}
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||
|
||
err = kv.RunInNewTxn(d.store, true, func(txn kv.Transaction) error {
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||
t := meta.NewMeta(txn)
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||
owner, err1 := t.GetBgJobOwner()
|
||
if err1 != nil {
|
||
return errors.Trace(err1)
|
||
}
|
||
if owner == nil || owner.OwnerID != d.uuid {
|
||
return nil
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||
}
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||
|
||
// background job's owner is me, clean it so other servers can compete for it quickly.
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||
return t.SetBgJobOwner(&model.Owner{})
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||
})
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||
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||
return errors.Trace(err)
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||
}
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func (d *ddl) Start() error {
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d.m.Lock()
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||
defer d.m.Unlock()
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||
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if !d.isClosed() {
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return nil
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}
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d.start()
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||
return nil
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||
}
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func (d *ddl) start() {
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d.quitCh = make(chan struct{})
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d.wait.Add(2)
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go d.onBackgroundWorker()
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||
go d.onDDLWorker()
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// for every start, we will send a fake job to let worker
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// check owner first and try to find whether a job exists and run.
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asyncNotify(d.ddlJobCh)
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asyncNotify(d.bgJobCh)
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}
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func (d *ddl) close() {
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if d.isClosed() {
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return
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||
}
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||
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close(d.quitCh)
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|
||
d.wait.Wait()
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||
}
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func (d *ddl) isClosed() bool {
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||
select {
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||
case <-d.quitCh:
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||
return true
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||
default:
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||
return false
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||
}
|
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}
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func (d *ddl) SetLease(lease time.Duration) {
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d.m.Lock()
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defer d.m.Unlock()
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|
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if lease == d.lease {
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return
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||
}
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||
log.Warnf("[ddl] change schema lease %s -> %s", d.lease, lease)
|
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|
||
if d.isClosed() {
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// if already closed, just set lease and return
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d.lease = lease
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||
return
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||
}
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||
|
||
// close the running worker and start again
|
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d.close()
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d.lease = lease
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d.start()
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}
|
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|
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func (d *ddl) GetLease() time.Duration {
|
||
d.m.RLock()
|
||
lease := d.lease
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||
d.m.RUnlock()
|
||
return lease
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||
}
|
||
|
||
func (d *ddl) GetInformationSchema() infoschema.InfoSchema {
|
||
return d.infoHandle.Get()
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||
}
|
||
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func (d *ddl) genGlobalID() (int64, error) {
|
||
var globalID int64
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||
err := kv.RunInNewTxn(d.store, true, func(txn kv.Transaction) error {
|
||
var err error
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||
globalID, err = meta.NewMeta(txn).GenGlobalID()
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||
return errors.Trace(err)
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||
})
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return globalID, errors.Trace(err)
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}
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|
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func (d *ddl) CreateSchema(ctx context.Context, schema model.CIStr, charsetInfo *ast.CharsetOpt) (err error) {
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is := d.GetInformationSchema()
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_, ok := is.SchemaByName(schema)
|
||
if ok {
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||
return errors.Trace(infoschema.DatabaseExists)
|
||
}
|
||
|
||
schemaID, err := d.genGlobalID()
|
||
if err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
dbInfo := &model.DBInfo{
|
||
Name: schema,
|
||
}
|
||
if charsetInfo != nil {
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||
dbInfo.Charset = charsetInfo.Chs
|
||
dbInfo.Collate = charsetInfo.Col
|
||
} else {
|
||
dbInfo.Charset, dbInfo.Collate = getDefaultCharsetAndCollate()
|
||
}
|
||
|
||
job := &model.Job{
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||
SchemaID: schemaID,
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||
Type: model.ActionCreateSchema,
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||
Args: []interface{}{dbInfo},
|
||
}
|
||
|
||
err = d.startDDLJob(ctx, job)
|
||
err = d.hook.OnChanged(err)
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
func (d *ddl) DropSchema(ctx context.Context, schema model.CIStr) (err error) {
|
||
is := d.GetInformationSchema()
|
||
old, ok := is.SchemaByName(schema)
|
||
if !ok {
|
||
return errors.Trace(infoschema.DatabaseNotExists)
|
||
}
|
||
|
||
job := &model.Job{
|
||
SchemaID: old.ID,
|
||
Type: model.ActionDropSchema,
|
||
}
|
||
|
||
err = d.startDDLJob(ctx, job)
|
||
err = d.hook.OnChanged(err)
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
func getDefaultCharsetAndCollate() (string, string) {
|
||
// TODO: TableDefaultCharset-->DatabaseDefaultCharset-->SystemDefaultCharset.
|
||
// TODO: change TableOption parser to parse collate.
|
||
// This is a tmp solution.
|
||
return "utf8", "utf8_unicode_ci"
|
||
}
|
||
|
||
func setColumnFlagWithConstraint(colMap map[string]*column.Col, v *ast.Constraint) {
|
||
switch v.Tp {
|
||
case ast.ConstraintPrimaryKey:
|
||
for _, key := range v.Keys {
|
||
c, ok := colMap[key.Column.Name.L]
|
||
if !ok {
|
||
// TODO: table constraint on unknown column.
|
||
continue
|
||
}
|
||
c.Flag |= mysql.PriKeyFlag
|
||
// Primary key can not be NULL.
|
||
c.Flag |= mysql.NotNullFlag
|
||
}
|
||
case ast.ConstraintUniq, ast.ConstraintUniqIndex, ast.ConstraintUniqKey:
|
||
for i, key := range v.Keys {
|
||
c, ok := colMap[key.Column.Name.L]
|
||
if !ok {
|
||
// TODO: table constraint on unknown column.
|
||
continue
|
||
}
|
||
if i == 0 {
|
||
// Only the first column can be set
|
||
// if unique index has multi columns,
|
||
// the flag should be MultipleKeyFlag.
|
||
// See: https://dev.mysql.com/doc/refman/5.7/en/show-columns.html
|
||
if len(v.Keys) > 1 {
|
||
c.Flag |= mysql.MultipleKeyFlag
|
||
} else {
|
||
c.Flag |= mysql.UniqueKeyFlag
|
||
}
|
||
}
|
||
}
|
||
case ast.ConstraintKey, ast.ConstraintIndex:
|
||
for i, key := range v.Keys {
|
||
c, ok := colMap[key.Column.Name.L]
|
||
if !ok {
|
||
// TODO: table constraint on unknown column.
|
||
continue
|
||
}
|
||
if i == 0 {
|
||
// Only the first column can be set.
|
||
c.Flag |= mysql.MultipleKeyFlag
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func (d *ddl) buildColumnsAndConstraints(ctx context.Context, colDefs []*ast.ColumnDef,
|
||
constraints []*ast.Constraint) ([]*column.Col, []*ast.Constraint, error) {
|
||
var cols []*column.Col
|
||
colMap := map[string]*column.Col{}
|
||
for i, colDef := range colDefs {
|
||
col, cts, err := d.buildColumnAndConstraint(ctx, i, colDef)
|
||
if err != nil {
|
||
return nil, nil, errors.Trace(err)
|
||
}
|
||
col.State = model.StatePublic
|
||
constraints = append(constraints, cts...)
|
||
cols = append(cols, col)
|
||
colMap[colDef.Name.Name.L] = col
|
||
}
|
||
// traverse table Constraints and set col.flag
|
||
for _, v := range constraints {
|
||
setColumnFlagWithConstraint(colMap, v)
|
||
}
|
||
return cols, constraints, nil
|
||
}
|
||
|
||
func (d *ddl) buildColumnAndConstraint(ctx context.Context, offset int,
|
||
colDef *ast.ColumnDef) (*column.Col, []*ast.Constraint, error) {
|
||
// Set charset.
|
||
if len(colDef.Tp.Charset) == 0 {
|
||
switch colDef.Tp.Tp {
|
||
case mysql.TypeString, mysql.TypeVarchar, mysql.TypeVarString, mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob:
|
||
colDef.Tp.Charset, colDef.Tp.Collate = getDefaultCharsetAndCollate()
|
||
default:
|
||
colDef.Tp.Charset = charset.CharsetBin
|
||
colDef.Tp.Collate = charset.CharsetBin
|
||
}
|
||
}
|
||
|
||
col, cts, err := columnDefToCol(ctx, offset, colDef)
|
||
if err != nil {
|
||
return nil, nil, errors.Trace(err)
|
||
}
|
||
|
||
col.ID, err = d.genGlobalID()
|
||
if err != nil {
|
||
return nil, nil, errors.Trace(err)
|
||
}
|
||
|
||
return col, cts, nil
|
||
}
|
||
|
||
// columnDefToCol converts ColumnDef to Col and TableConstraints.
|
||
func columnDefToCol(ctx context.Context, offset int, colDef *ast.ColumnDef) (*column.Col, []*ast.Constraint, error) {
|
||
constraints := []*ast.Constraint{}
|
||
col := &column.Col{
|
||
ColumnInfo: model.ColumnInfo{
|
||
Offset: offset,
|
||
Name: colDef.Name.Name,
|
||
FieldType: *colDef.Tp,
|
||
},
|
||
}
|
||
|
||
// Check and set TimestampFlag and OnUpdateNowFlag.
|
||
if col.Tp == mysql.TypeTimestamp {
|
||
col.Flag |= mysql.TimestampFlag
|
||
col.Flag |= mysql.OnUpdateNowFlag
|
||
col.Flag |= mysql.NotNullFlag
|
||
}
|
||
|
||
// If flen is not assigned, assigned it by type.
|
||
if col.Flen == types.UnspecifiedLength {
|
||
col.Flen = mysql.GetDefaultFieldLength(col.Tp)
|
||
}
|
||
if col.Decimal == types.UnspecifiedLength {
|
||
col.Decimal = mysql.GetDefaultDecimal(col.Tp)
|
||
}
|
||
|
||
setOnUpdateNow := false
|
||
hasDefaultValue := false
|
||
if colDef.Options != nil {
|
||
keys := []*ast.IndexColName{
|
||
{
|
||
Column: colDef.Name,
|
||
Length: colDef.Tp.Flen,
|
||
},
|
||
}
|
||
for _, v := range colDef.Options {
|
||
switch v.Tp {
|
||
case ast.ColumnOptionNotNull:
|
||
col.Flag |= mysql.NotNullFlag
|
||
case ast.ColumnOptionNull:
|
||
col.Flag &= ^uint(mysql.NotNullFlag)
|
||
removeOnUpdateNowFlag(col)
|
||
case ast.ColumnOptionAutoIncrement:
|
||
col.Flag |= mysql.AutoIncrementFlag
|
||
case ast.ColumnOptionPrimaryKey:
|
||
constraint := &ast.Constraint{Tp: ast.ConstraintPrimaryKey, Keys: keys}
|
||
constraints = append(constraints, constraint)
|
||
col.Flag |= mysql.PriKeyFlag
|
||
case ast.ColumnOptionUniq:
|
||
constraint := &ast.Constraint{Tp: ast.ConstraintUniq, Name: colDef.Name.Name.O, Keys: keys}
|
||
constraints = append(constraints, constraint)
|
||
col.Flag |= mysql.UniqueKeyFlag
|
||
case ast.ColumnOptionIndex:
|
||
constraint := &ast.Constraint{Tp: ast.ConstraintIndex, Name: colDef.Name.Name.O, Keys: keys}
|
||
constraints = append(constraints, constraint)
|
||
case ast.ColumnOptionUniqIndex:
|
||
constraint := &ast.Constraint{Tp: ast.ConstraintUniqIndex, Name: colDef.Name.Name.O, Keys: keys}
|
||
constraints = append(constraints, constraint)
|
||
col.Flag |= mysql.UniqueKeyFlag
|
||
case ast.ColumnOptionKey:
|
||
constraint := &ast.Constraint{Tp: ast.ConstraintKey, Name: colDef.Name.Name.O, Keys: keys}
|
||
constraints = append(constraints, constraint)
|
||
case ast.ColumnOptionUniqKey:
|
||
constraint := &ast.Constraint{Tp: ast.ConstraintUniqKey, Name: colDef.Name.Name.O, Keys: keys}
|
||
constraints = append(constraints, constraint)
|
||
col.Flag |= mysql.UniqueKeyFlag
|
||
case ast.ColumnOptionDefaultValue:
|
||
value, err := getDefaultValue(ctx, v, colDef.Tp.Tp, colDef.Tp.Decimal)
|
||
if err != nil {
|
||
return nil, nil, errors.Errorf("invalid default value - %s", errors.Trace(err))
|
||
}
|
||
col.DefaultValue = value
|
||
hasDefaultValue = true
|
||
removeOnUpdateNowFlag(col)
|
||
case ast.ColumnOptionOnUpdate:
|
||
if !evaluator.IsCurrentTimeExpr(v.Expr) {
|
||
return nil, nil, errors.Errorf("invalid ON UPDATE for - %s", col.Name)
|
||
}
|
||
|
||
col.Flag |= mysql.OnUpdateNowFlag
|
||
setOnUpdateNow = true
|
||
case ast.ColumnOptionFulltext, ast.ColumnOptionComment:
|
||
// Do nothing.
|
||
}
|
||
}
|
||
}
|
||
|
||
setTimestampDefaultValue(col, hasDefaultValue, setOnUpdateNow)
|
||
|
||
// Set `NoDefaultValueFlag` if this field doesn't have a default value and
|
||
// it is `not null` and not an `AUTO_INCREMENT` field or `TIMESTAMP` field.
|
||
setNoDefaultValueFlag(col, hasDefaultValue)
|
||
|
||
err := checkDefaultValue(col, hasDefaultValue)
|
||
if err != nil {
|
||
return nil, nil, errors.Trace(err)
|
||
}
|
||
if col.Charset == charset.CharsetBin {
|
||
col.Flag |= mysql.BinaryFlag
|
||
}
|
||
return col, constraints, nil
|
||
}
|
||
|
||
func getDefaultValue(ctx context.Context, c *ast.ColumnOption, tp byte, fsp int) (interface{}, error) {
|
||
if tp == mysql.TypeTimestamp || tp == mysql.TypeDatetime {
|
||
value, err := evaluator.GetTimeValue(ctx, c.Expr, tp, fsp)
|
||
if err != nil {
|
||
return nil, errors.Trace(err)
|
||
}
|
||
|
||
// Value is nil means `default null`.
|
||
if value == nil {
|
||
return nil, nil
|
||
}
|
||
|
||
// If value is mysql.Time, convert it to string.
|
||
if vv, ok := value.(mysql.Time); ok {
|
||
return vv.String(), nil
|
||
}
|
||
|
||
return value, nil
|
||
}
|
||
v, err := evaluator.Eval(ctx, c.Expr)
|
||
if err != nil {
|
||
return nil, errors.Trace(err)
|
||
}
|
||
return v, nil
|
||
}
|
||
|
||
func removeOnUpdateNowFlag(c *column.Col) {
|
||
// For timestamp Col, if it is set null or default value,
|
||
// OnUpdateNowFlag should be removed.
|
||
if mysql.HasTimestampFlag(c.Flag) {
|
||
c.Flag &= ^uint(mysql.OnUpdateNowFlag)
|
||
}
|
||
}
|
||
|
||
func setTimestampDefaultValue(c *column.Col, hasDefaultValue bool, setOnUpdateNow bool) {
|
||
if hasDefaultValue {
|
||
return
|
||
}
|
||
|
||
// For timestamp Col, if is not set default value or not set null, use current timestamp.
|
||
if mysql.HasTimestampFlag(c.Flag) && mysql.HasNotNullFlag(c.Flag) {
|
||
if setOnUpdateNow {
|
||
c.DefaultValue = evaluator.ZeroTimestamp
|
||
} else {
|
||
c.DefaultValue = evaluator.CurrentTimestamp
|
||
}
|
||
}
|
||
}
|
||
|
||
func setNoDefaultValueFlag(c *column.Col, hasDefaultValue bool) {
|
||
if hasDefaultValue {
|
||
return
|
||
}
|
||
|
||
if !mysql.HasNotNullFlag(c.Flag) {
|
||
return
|
||
}
|
||
|
||
// Check if it is an `AUTO_INCREMENT` field or `TIMESTAMP` field.
|
||
if !mysql.HasAutoIncrementFlag(c.Flag) && !mysql.HasTimestampFlag(c.Flag) {
|
||
c.Flag |= mysql.NoDefaultValueFlag
|
||
}
|
||
}
|
||
|
||
func checkDefaultValue(c *column.Col, hasDefaultValue bool) error {
|
||
if !hasDefaultValue {
|
||
return nil
|
||
}
|
||
|
||
if c.DefaultValue != nil {
|
||
return nil
|
||
}
|
||
|
||
// Set not null but default null is invalid.
|
||
if mysql.HasNotNullFlag(c.Flag) {
|
||
return errors.Errorf("invalid default value for %s", c.Name)
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
func checkDuplicateColumn(colDefs []*ast.ColumnDef) error {
|
||
colNames := map[string]bool{}
|
||
for _, colDef := range colDefs {
|
||
nameLower := colDef.Name.Name.O
|
||
if colNames[nameLower] {
|
||
return errors.Errorf("CREATE TABLE: duplicate column %s", colDef.Name)
|
||
}
|
||
colNames[nameLower] = true
|
||
}
|
||
return nil
|
||
}
|
||
|
||
func checkConstraintNames(constraints []*ast.Constraint) error {
|
||
constrNames := map[string]bool{}
|
||
|
||
// Check not empty constraint name whether is duplicated.
|
||
for _, constr := range constraints {
|
||
if constr.Tp == ast.ConstraintForeignKey {
|
||
// Ignore foreign key.
|
||
continue
|
||
}
|
||
if constr.Name != "" {
|
||
nameLower := strings.ToLower(constr.Name)
|
||
if constrNames[nameLower] {
|
||
return errors.Errorf("CREATE TABLE: duplicate key %s", constr.Name)
|
||
}
|
||
constrNames[nameLower] = true
|
||
}
|
||
}
|
||
|
||
// Set empty constraint names.
|
||
for _, constr := range constraints {
|
||
if constr.Name == "" && len(constr.Keys) > 0 {
|
||
colName := constr.Keys[0].Column.Name.O
|
||
constrName := colName
|
||
i := 2
|
||
for constrNames[strings.ToLower(constrName)] {
|
||
// We loop forever until we find constrName that haven't been used.
|
||
constrName = fmt.Sprintf("%s_%d", colName, i)
|
||
i++
|
||
}
|
||
constr.Name = constrName
|
||
constrNames[constrName] = true
|
||
}
|
||
}
|
||
return nil
|
||
}
|
||
|
||
func (d *ddl) buildTableInfo(tableName model.CIStr, cols []*column.Col, constraints []*ast.Constraint) (tbInfo *model.TableInfo, err error) {
|
||
tbInfo = &model.TableInfo{
|
||
Name: tableName,
|
||
}
|
||
tbInfo.ID, err = d.genGlobalID()
|
||
if err != nil {
|
||
return nil, errors.Trace(err)
|
||
}
|
||
for _, v := range cols {
|
||
tbInfo.Columns = append(tbInfo.Columns, &v.ColumnInfo)
|
||
}
|
||
for _, constr := range constraints {
|
||
if constr.Tp == ast.ConstraintPrimaryKey {
|
||
if len(constr.Keys) == 1 {
|
||
key := constr.Keys[0]
|
||
col := column.FindCol(cols, key.Column.Name.O)
|
||
if col == nil {
|
||
return nil, errors.Errorf("No such column: %v", key)
|
||
}
|
||
switch col.Tp {
|
||
case mysql.TypeLong, mysql.TypeLonglong:
|
||
tbInfo.PKIsHandle = true
|
||
// Avoid creating index for PK handle column.
|
||
continue
|
||
}
|
||
}
|
||
}
|
||
|
||
// 1. check if the column is exists
|
||
// 2. add index
|
||
indexColumns := make([]*model.IndexColumn, 0, len(constr.Keys))
|
||
for _, key := range constr.Keys {
|
||
col := column.FindCol(cols, key.Column.Name.O)
|
||
if col == nil {
|
||
return nil, errors.Errorf("No such column: %v", key)
|
||
}
|
||
indexColumns = append(indexColumns, &model.IndexColumn{
|
||
Name: key.Column.Name,
|
||
Offset: col.Offset,
|
||
Length: key.Length,
|
||
})
|
||
}
|
||
idxInfo := &model.IndexInfo{
|
||
Name: model.NewCIStr(constr.Name),
|
||
Columns: indexColumns,
|
||
State: model.StatePublic,
|
||
}
|
||
switch constr.Tp {
|
||
case ast.ConstraintPrimaryKey:
|
||
idxInfo.Unique = true
|
||
idxInfo.Primary = true
|
||
idxInfo.Name = model.NewCIStr(column.PrimaryKeyName)
|
||
case ast.ConstraintUniq, ast.ConstraintUniqKey, ast.ConstraintUniqIndex:
|
||
idxInfo.Unique = true
|
||
}
|
||
if constr.Option != nil {
|
||
idxInfo.Comment = constr.Option.Comment
|
||
idxInfo.Tp = constr.Option.Tp
|
||
} else {
|
||
// Use btree as default index type.
|
||
idxInfo.Tp = model.IndexTypeBtree
|
||
}
|
||
idxInfo.ID, err = d.genGlobalID()
|
||
if err != nil {
|
||
return nil, errors.Trace(err)
|
||
}
|
||
tbInfo.Indices = append(tbInfo.Indices, idxInfo)
|
||
}
|
||
return
|
||
}
|
||
|
||
func (d *ddl) CreateTable(ctx context.Context, ident ast.Ident, colDefs []*ast.ColumnDef,
|
||
constraints []*ast.Constraint, options []*ast.TableOption) (err error) {
|
||
is := d.GetInformationSchema()
|
||
schema, ok := is.SchemaByName(ident.Schema)
|
||
if !ok {
|
||
return infoschema.DatabaseNotExists.Gen("database %s not exists", ident.Schema)
|
||
}
|
||
if is.TableExists(ident.Schema, ident.Name) {
|
||
return errors.Trace(infoschema.TableExists)
|
||
}
|
||
if err = checkDuplicateColumn(colDefs); err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
cols, newConstraints, err := d.buildColumnsAndConstraints(ctx, colDefs, constraints)
|
||
if err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
err = checkConstraintNames(newConstraints)
|
||
if err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
tbInfo, err := d.buildTableInfo(ident.Name, cols, newConstraints)
|
||
if err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
job := &model.Job{
|
||
SchemaID: schema.ID,
|
||
TableID: tbInfo.ID,
|
||
Type: model.ActionCreateTable,
|
||
Args: []interface{}{tbInfo},
|
||
}
|
||
|
||
err = d.startDDLJob(ctx, job)
|
||
if err == nil {
|
||
err = d.handleTableOptions(options, tbInfo, schema.ID)
|
||
}
|
||
err = d.hook.OnChanged(err)
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
func (d *ddl) handleTableOptions(options []*ast.TableOption, tbInfo *model.TableInfo, schemaID int64) error {
|
||
for _, op := range options {
|
||
if op.Tp == ast.TableOptionAutoIncrement {
|
||
alloc := autoid.NewAllocator(d.store, schemaID)
|
||
tbInfo.State = model.StatePublic
|
||
tb, err := table.TableFromMeta(alloc, tbInfo)
|
||
if err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
// The operation of the minus 1 to make sure that the current value doesn't be used,
|
||
// the next Alloc operation will get this value.
|
||
// Its behavior is consistent with MySQL.
|
||
if err = tb.RebaseAutoID(int64(op.UintValue-1), false); err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
}
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
func (d *ddl) AlterTable(ctx context.Context, ident ast.Ident, specs []*ast.AlterTableSpec) (err error) {
|
||
// now we only allow one schema changes at the same time.
|
||
if len(specs) != 1 {
|
||
return errors.New("can't run multi schema changes in one DDL")
|
||
}
|
||
|
||
for _, spec := range specs {
|
||
switch spec.Tp {
|
||
case ast.AlterTableAddColumn:
|
||
err = d.AddColumn(ctx, ident, spec)
|
||
case ast.AlterTableDropColumn:
|
||
err = d.DropColumn(ctx, ident, spec.DropColumn.Name)
|
||
case ast.AlterTableDropIndex:
|
||
err = d.DropIndex(ctx, ident, model.NewCIStr(spec.Name))
|
||
case ast.AlterTableAddConstraint:
|
||
constr := spec.Constraint
|
||
switch spec.Constraint.Tp {
|
||
case ast.ConstraintKey, ast.ConstraintIndex:
|
||
err = d.CreateIndex(ctx, ident, false, model.NewCIStr(constr.Name), spec.Constraint.Keys)
|
||
case ast.ConstraintUniq, ast.ConstraintUniqIndex, ast.ConstraintUniqKey:
|
||
err = d.CreateIndex(ctx, ident, true, model.NewCIStr(constr.Name), spec.Constraint.Keys)
|
||
default:
|
||
// nothing to do now.
|
||
}
|
||
default:
|
||
// nothing to do now.
|
||
}
|
||
|
||
if err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
func checkColumnConstraint(constraints []*ast.ColumnOption) error {
|
||
for _, constraint := range constraints {
|
||
switch constraint.Tp {
|
||
case ast.ColumnOptionAutoIncrement, ast.ColumnOptionPrimaryKey, ast.ColumnOptionUniq, ast.ColumnOptionUniqKey:
|
||
return errors.Errorf("unsupported add column constraint - %v", constraint.Tp)
|
||
}
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
// AddColumn will add a new column to the table.
|
||
func (d *ddl) AddColumn(ctx context.Context, ti ast.Ident, spec *ast.AlterTableSpec) error {
|
||
// Check whether the added column constraints are supported.
|
||
err := checkColumnConstraint(spec.Column.Options)
|
||
if err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
is := d.infoHandle.Get()
|
||
schema, ok := is.SchemaByName(ti.Schema)
|
||
if !ok {
|
||
return errors.Trace(infoschema.DatabaseNotExists)
|
||
}
|
||
|
||
t, err := is.TableByName(ti.Schema, ti.Name)
|
||
if err != nil {
|
||
return errors.Trace(infoschema.TableNotExists)
|
||
}
|
||
|
||
// Check whether added column has existed.
|
||
colName := spec.Column.Name.Name.O
|
||
col := column.FindCol(t.Cols(), colName)
|
||
if col != nil {
|
||
return errors.Errorf("column %s already exists", colName)
|
||
}
|
||
|
||
// ingore table constraints now, maybe return error later
|
||
// we use length(t.Cols()) as the default offset first, later we will change the
|
||
// column's offset later.
|
||
col, _, err = d.buildColumnAndConstraint(ctx, len(t.Cols()), spec.Column)
|
||
if err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
job := &model.Job{
|
||
SchemaID: schema.ID,
|
||
TableID: t.Meta().ID,
|
||
Type: model.ActionAddColumn,
|
||
Args: []interface{}{&col.ColumnInfo, spec.Position, 0},
|
||
}
|
||
|
||
err = d.startDDLJob(ctx, job)
|
||
err = d.hook.OnChanged(err)
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
// DropColumn will drop a column from the table, now we don't support drop the column with index covered.
|
||
func (d *ddl) DropColumn(ctx context.Context, ti ast.Ident, colName model.CIStr) error {
|
||
is := d.infoHandle.Get()
|
||
schema, ok := is.SchemaByName(ti.Schema)
|
||
if !ok {
|
||
return errors.Trace(infoschema.DatabaseNotExists)
|
||
}
|
||
|
||
t, err := is.TableByName(ti.Schema, ti.Name)
|
||
if err != nil {
|
||
return errors.Trace(infoschema.TableNotExists)
|
||
}
|
||
|
||
// Check whether dropped column has existed.
|
||
col := column.FindCol(t.Cols(), colName.L)
|
||
if col == nil {
|
||
return errors.Errorf("column %s doesn’t exist", colName.L)
|
||
}
|
||
|
||
job := &model.Job{
|
||
SchemaID: schema.ID,
|
||
TableID: t.Meta().ID,
|
||
Type: model.ActionDropColumn,
|
||
Args: []interface{}{colName},
|
||
}
|
||
|
||
err = d.startDDLJob(ctx, job)
|
||
err = d.hook.OnChanged(err)
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
// DropTable will proceed even if some table in the list does not exists.
|
||
func (d *ddl) DropTable(ctx context.Context, ti ast.Ident) (err error) {
|
||
is := d.GetInformationSchema()
|
||
schema, ok := is.SchemaByName(ti.Schema)
|
||
if !ok {
|
||
return infoschema.DatabaseNotExists.Gen("database %s not exists", ti.Schema)
|
||
}
|
||
|
||
tb, err := is.TableByName(ti.Schema, ti.Name)
|
||
if err != nil {
|
||
return errors.Trace(infoschema.TableNotExists)
|
||
}
|
||
|
||
job := &model.Job{
|
||
SchemaID: schema.ID,
|
||
TableID: tb.Meta().ID,
|
||
Type: model.ActionDropTable,
|
||
}
|
||
|
||
err = d.startDDLJob(ctx, job)
|
||
err = d.hook.OnChanged(err)
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
func (d *ddl) CreateIndex(ctx context.Context, ti ast.Ident, unique bool, indexName model.CIStr, idxColNames []*ast.IndexColName) error {
|
||
is := d.infoHandle.Get()
|
||
schema, ok := is.SchemaByName(ti.Schema)
|
||
if !ok {
|
||
return infoschema.DatabaseNotExists.Gen("database %s not exists", ti.Schema)
|
||
}
|
||
|
||
t, err := is.TableByName(ti.Schema, ti.Name)
|
||
if err != nil {
|
||
return errors.Trace(infoschema.TableNotExists)
|
||
}
|
||
indexID, err := d.genGlobalID()
|
||
if err != nil {
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
job := &model.Job{
|
||
SchemaID: schema.ID,
|
||
TableID: t.Meta().ID,
|
||
Type: model.ActionAddIndex,
|
||
Args: []interface{}{unique, indexName, indexID, idxColNames},
|
||
}
|
||
|
||
err = d.startDDLJob(ctx, job)
|
||
err = d.hook.OnChanged(err)
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
func (d *ddl) DropIndex(ctx context.Context, ti ast.Ident, indexName model.CIStr) error {
|
||
is := d.infoHandle.Get()
|
||
schema, ok := is.SchemaByName(ti.Schema)
|
||
if !ok {
|
||
return errors.Trace(infoschema.DatabaseNotExists)
|
||
}
|
||
|
||
t, err := is.TableByName(ti.Schema, ti.Name)
|
||
if err != nil {
|
||
return errors.Trace(infoschema.TableNotExists)
|
||
}
|
||
|
||
job := &model.Job{
|
||
SchemaID: schema.ID,
|
||
TableID: t.Meta().ID,
|
||
Type: model.ActionDropIndex,
|
||
Args: []interface{}{indexName},
|
||
}
|
||
|
||
err = d.startDDLJob(ctx, job)
|
||
err = d.hook.OnChanged(err)
|
||
return errors.Trace(err)
|
||
}
|
||
|
||
// findCol finds column in cols by name.
|
||
func findCol(cols []*model.ColumnInfo, name string) *model.ColumnInfo {
|
||
name = strings.ToLower(name)
|
||
for _, col := range cols {
|
||
if col.Name.L == name {
|
||
return col
|
||
}
|
||
}
|
||
|
||
return nil
|
||
}
|