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gitea/vendor/github.com/pingcap/tidb/ddl/table.go

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Go

// 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 (
"github.com/juju/errors"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/meta"
"github.com/pingcap/tidb/meta/autoid"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/terror"
)
func (d *ddl) onCreateTable(t *meta.Meta, job *model.Job) error {
schemaID := job.SchemaID
tbInfo := &model.TableInfo{}
if err := job.DecodeArgs(tbInfo); err != nil {
// arg error, cancel this job.
job.State = model.JobCancelled
return errors.Trace(err)
}
tbInfo.State = model.StateNone
tables, err := t.ListTables(schemaID)
if terror.ErrorEqual(err, meta.ErrDBNotExists) {
job.State = model.JobCancelled
return errors.Trace(infoschema.DatabaseNotExists)
} else if err != nil {
return errors.Trace(err)
}
for _, tbl := range tables {
if tbl.Name.L == tbInfo.Name.L {
if tbl.ID != tbInfo.ID {
// table exists, can't create, we should cancel this job now.
job.State = model.JobCancelled
return errors.Trace(infoschema.TableExists)
}
tbInfo = tbl
}
}
_, err = t.GenSchemaVersion()
if err != nil {
return errors.Trace(err)
}
switch tbInfo.State {
case model.StateNone:
// none -> public
job.SchemaState = model.StatePublic
tbInfo.State = model.StatePublic
err = t.CreateTable(schemaID, tbInfo)
if err != nil {
return errors.Trace(err)
}
// finish this job
job.State = model.JobDone
return nil
default:
return errors.Errorf("invalid table state %v", tbInfo.State)
}
}
func (d *ddl) delReorgTable(t *meta.Meta, job *model.Job) error {
tblInfo := &model.TableInfo{}
err := job.DecodeArgs(tblInfo)
if err != nil {
// arg error, cancel this job.
job.State = model.JobCancelled
return errors.Trace(err)
}
tblInfo.State = model.StateDeleteReorganization
tbl, err := d.getTable(job.SchemaID, tblInfo)
if err != nil {
return errors.Trace(err)
}
err = d.dropTableData(tbl)
if err != nil {
return errors.Trace(err)
}
// finish this background job
job.SchemaState = model.StateNone
job.State = model.JobDone
return nil
}
func (d *ddl) onDropTable(t *meta.Meta, job *model.Job) error {
schemaID := job.SchemaID
tableID := job.TableID
tblInfo, err := t.GetTable(schemaID, tableID)
if terror.ErrorEqual(err, meta.ErrDBNotExists) {
job.State = model.JobCancelled
return errors.Trace(infoschema.DatabaseNotExists)
} else if err != nil {
return errors.Trace(err)
}
if tblInfo == nil {
job.State = model.JobCancelled
return errors.Trace(infoschema.TableNotExists)
}
_, err = t.GenSchemaVersion()
if err != nil {
return errors.Trace(err)
}
switch tblInfo.State {
case model.StatePublic:
// public -> write only
job.SchemaState = model.StateWriteOnly
tblInfo.State = model.StateWriteOnly
err = t.UpdateTable(schemaID, tblInfo)
case model.StateWriteOnly:
// write only -> delete only
job.SchemaState = model.StateDeleteOnly
tblInfo.State = model.StateDeleteOnly
err = t.UpdateTable(schemaID, tblInfo)
case model.StateDeleteOnly:
tblInfo.State = model.StateNone
err = t.UpdateTable(schemaID, tblInfo)
if err = t.DropTable(job.SchemaID, job.TableID); err != nil {
break
}
// finish this job
job.Args = []interface{}{tblInfo}
job.State = model.JobDone
job.SchemaState = model.StateNone
default:
err = errors.Errorf("invalid table state %v", tblInfo.State)
}
return errors.Trace(err)
}
func (d *ddl) getTable(schemaID int64, tblInfo *model.TableInfo) (table.Table, error) {
alloc := autoid.NewAllocator(d.store, schemaID)
tbl, err := table.TableFromMeta(alloc, tblInfo)
return tbl, errors.Trace(err)
}
func (d *ddl) getTableInfo(t *meta.Meta, job *model.Job) (*model.TableInfo, error) {
schemaID := job.SchemaID
tableID := job.TableID
tblInfo, err := t.GetTable(schemaID, tableID)
if terror.ErrorEqual(err, meta.ErrDBNotExists) {
job.State = model.JobCancelled
return nil, errors.Trace(infoschema.DatabaseNotExists)
} else if err != nil {
return nil, errors.Trace(err)
} else if tblInfo == nil {
job.State = model.JobCancelled
return nil, errors.Trace(infoschema.TableNotExists)
}
if tblInfo.State != model.StatePublic {
job.State = model.JobCancelled
return nil, errors.Errorf("table %s is not in public, but %s", tblInfo.Name.L, tblInfo.State)
}
return tblInfo, nil
}
func (d *ddl) dropTableData(t table.Table) error {
// delete table data
err := d.delKeysWithPrefix(t.RecordPrefix())
if err != nil {
return errors.Trace(err)
}
// delete table index
err = d.delKeysWithPrefix(t.IndexPrefix())
return errors.Trace(err)
}