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ddl_api.go
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ddl_api.go
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// 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 2016 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"
"time"
"github.com/juju/errors"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/expression"
"github.com/pingcap/tidb/infoschema"
"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/stringutil"
"github.com/pingcap/tidb/util/types"
)
func (d *ddl) CreateSchema(ctx context.Context, schema model.CIStr, charsetInfo *ast.CharsetOpt) (err error) {
is := d.GetInformationSchema()
_, ok := is.SchemaByName(schema)
if ok {
return infoschema.ErrDatabaseExists.GenByArgs(schema)
}
if err = checkTooLongSchema(schema); err != nil {
return errors.Trace(err)
}
schemaID, err := d.genGlobalID()
if err != nil {
return errors.Trace(err)
}
dbInfo := &model.DBInfo{
Name: schema,
}
if charsetInfo != nil {
dbInfo.Charset = charsetInfo.Chs
dbInfo.Collate = charsetInfo.Col
} else {
dbInfo.Charset, dbInfo.Collate = getDefaultCharsetAndCollate()
}
job := &model.Job{
SchemaID: schemaID,
Type: model.ActionCreateSchema,
BinlogInfo: &model.HistoryInfo{},
Args: []interface{}{dbInfo},
}
err = d.doDDLJob(ctx, job)
err = d.callHookOnChanged(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.ErrDatabaseNotExists)
}
job := &model.Job{
SchemaID: old.ID,
Type: model.ActionDropSchema,
BinlogInfo: &model.HistoryInfo{},
}
err = d.doDDLJob(ctx, job)
err = d.callHookOnChanged(err)
return errors.Trace(err)
}
func checkTooLongSchema(schema model.CIStr) error {
if len(schema.L) > mysql.MaxDatabaseNameLength {
return ErrTooLongIdent.Gen("too long schema %s", schema)
}
return nil
}
func checkTooLongTable(table model.CIStr) error {
if len(table.L) > mysql.MaxTableNameLength {
return ErrTooLongIdent.Gen("too long table %s", table)
}
return nil
}
func getDefaultCharsetAndCollate() (string, string) {
// TODO: TableDefaultCharset-->DatabaseDefaultCharset-->SystemDefaultCharset.
// TODO: Change TableOption parser to parse collate.
// This is a tmp solution.
return "utf8", "utf8_bin"
}
func setColumnFlagWithConstraint(colMap map[string]*table.Column, v *ast.Constraint) {
switch v.Tp {
case ast.ConstraintPrimaryKey:
for _, key := range v.Keys {
c, ok := colMap[key.Column.Name.L]
if !ok {
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 {
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 {
continue
}
if i == 0 {
// Only the first column can be set.
c.Flag |= mysql.MultipleKeyFlag
}
}
}
}
func buildColumnsAndConstraints(ctx context.Context, colDefs []*ast.ColumnDef,
constraints []*ast.Constraint) ([]*table.Column, []*ast.Constraint, error) {
var cols []*table.Column
colMap := map[string]*table.Column{}
for i, colDef := range colDefs {
col, cts, err := 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 setCharsetCollationFlenDecimal(tp *types.FieldType) error {
tp.Charset = strings.ToLower(tp.Charset)
tp.Collate = strings.ToLower(tp.Collate)
if len(tp.Charset) == 0 {
switch tp.Tp {
case mysql.TypeString, mysql.TypeVarchar, mysql.TypeVarString, mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob, mysql.TypeEnum, mysql.TypeSet:
tp.Charset, tp.Collate = getDefaultCharsetAndCollate()
default:
tp.Charset = charset.CharsetBin
tp.Collate = charset.CharsetBin
}
} else {
if !charset.ValidCharsetAndCollation(tp.Charset, tp.Collate) {
return errUnsupportedCharset.GenByArgs(tp.Charset, tp.Collate)
}
if len(tp.Collate) == 0 {
var err error
tp.Collate, err = charset.GetDefaultCollation(tp.Charset)
if err != nil {
return errors.Trace(err)
}
}
}
// Use default value for flen or decimal when they are unspecified.
defaultFlen, defaultDecimal := mysql.GetDefaultFieldLengthAndDecimal(tp.Tp)
if tp.Flen == types.UnspecifiedLength {
tp.Flen = defaultFlen
if mysql.HasUnsignedFlag(tp.Flag) && tp.Tp != mysql.TypeLonglong && mysql.IsIntegerType(tp.Tp) {
// Issue #4684: the flen of unsigned integer(except bigint) is 1 digit shorter than signed integer
// because it has no prefix "+" or "-" character.
tp.Flen--
}
}
if tp.Decimal == types.UnspecifiedLength {
tp.Decimal = defaultDecimal
}
return nil
}
func buildColumnAndConstraint(ctx context.Context, offset int,
colDef *ast.ColumnDef) (*table.Column, []*ast.Constraint, error) {
err := setCharsetCollationFlenDecimal(colDef.Tp)
if err != nil {
return nil, nil, errors.Trace(err)
}
col, cts, err := columnDefToCol(ctx, offset, colDef)
if err != nil {
return nil, nil, errors.Trace(err)
}
return col, cts, nil
}
// checkColumnCantHaveDefaultValue checks the column can have value as default or not.
// Now, TEXT/BLOB/JSON can't have not null value as default.
func checkColumnCantHaveDefaultValue(col *table.Column, value interface{}) (err error) {
if value != nil && (col.Tp == mysql.TypeJSON ||
col.Tp == mysql.TypeTinyBlob || col.Tp == mysql.TypeMediumBlob ||
col.Tp == mysql.TypeLongBlob || col.Tp == mysql.TypeBlob) {
// TEXT/BLOB/JSON can't have not null default values.
return errBlobCantHaveDefault.GenByArgs(col.Name.O)
}
return nil
}
// columnDefToCol converts ColumnDef to Col and TableConstraints.
func columnDefToCol(ctx context.Context, offset int, colDef *ast.ColumnDef) (*table.Column, []*ast.Constraint, error) {
constraints := []*ast.Constraint{}
col := table.ToColumn(&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
}
setOnUpdateNow := false
hasDefaultValue := false
if colDef.Options != nil {
len := types.UnspecifiedLength
keys := []*ast.IndexColName{
{
Column: colDef.Name,
Length: len,
},
}
for _, v := range colDef.Options {
switch v.Tp {
case ast.ColumnOptionNotNull:
col.Flag |= mysql.NotNullFlag
case ast.ColumnOptionNull:
col.Flag &= ^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.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, ErrColumnBadNull.Gen("invalid default value - %s", err)
}
if err = checkColumnCantHaveDefaultValue(col, value); err != nil {
return nil, nil, errors.Trace(err)
}
col.DefaultValue = value
hasDefaultValue = true
removeOnUpdateNowFlag(col)
case ast.ColumnOptionOnUpdate:
// TODO: Support other time functions.
if !expression.IsCurrentTimestampExpr(v.Expr) {
return nil, nil, ErrInvalidOnUpdate.Gen("invalid ON UPDATE for - %s", col.Name)
}
col.Flag |= mysql.OnUpdateNowFlag
setOnUpdateNow = true
case ast.ColumnOptionComment:
err := setColumnComment(ctx, col, v)
if err != nil {
return nil, nil, errors.Trace(err)
}
case ast.ColumnOptionGenerated:
col.GeneratedExprString = stringutil.RemoveBlanks(v.Expr.Text())
col.GeneratedStored = v.Stored
_, dependColNames := findDependedColumnNames(colDef)
col.Dependences = dependColNames
case ast.ColumnOptionFulltext:
// TODO: Support this type.
}
}
}
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)
if col.Charset == charset.CharsetBin {
col.Flag |= mysql.BinaryFlag
}
if col.Tp == mysql.TypeBit {
// For BIT field, it's charset is binary but does not have binary flag.
col.Flag &= ^mysql.BinaryFlag
col.Flag |= mysql.UnsignedFlag
}
err := checkDefaultValue(ctx, col, hasDefaultValue)
if err != nil {
return nil, nil, errors.Trace(err)
}
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 {
vd, err := expression.GetTimeValue(ctx, c.Expr, tp, fsp)
value := vd.GetValue()
if err != nil {
return nil, errors.Trace(err)
}
// Value is nil means `default null`.
if value == nil {
return nil, nil
}
// If value is types.Time, convert it to string.
if vv, ok := value.(types.Time); ok {
return vv.String(), nil
}
return value, nil
}
v, err := expression.EvalAstExpr(c.Expr, ctx)
if err != nil {
return nil, errors.Trace(err)
}
if v.IsNull() {
return nil, nil
}
if v.Kind() == types.KindBinaryLiteral || v.Kind() == types.KindMysqlBit {
if tp == mysql.TypeBit ||
tp == mysql.TypeString || tp == mysql.TypeVarchar || tp == mysql.TypeVarString ||
tp == mysql.TypeBlob || tp == mysql.TypeLongBlob || tp == mysql.TypeMediumBlob || tp == mysql.TypeTinyBlob ||
tp == mysql.TypeJSON {
// For BinaryLiteral / string fields, when getting default value we cast the value into BinaryLiteral{}, thus we return
// its raw string content here.
return v.GetBinaryLiteral().ToString(), nil
}
// For other kind of fields (e.g. INT), we supply its integer value so that it acts as integers.
return v.GetBinaryLiteral().ToInt()
}
if tp == mysql.TypeBit {
if v.Kind() == types.KindInt64 || v.Kind() == types.KindUint64 {
// For BIT fields, convert int into BinaryLiteral.
return types.NewBinaryLiteralFromUint(v.GetUint64(), -1).ToString(), nil
}
}
return v.ToString()
}
func removeOnUpdateNowFlag(c *table.Column) {
// For timestamp Col, if it is set null or default value,
// OnUpdateNowFlag should be removed.
if mysql.HasTimestampFlag(c.Flag) {
c.Flag &= ^mysql.OnUpdateNowFlag
}
}
func setTimestampDefaultValue(c *table.Column, 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 = types.ZeroDatetimeStr
} else {
c.DefaultValue = strings.ToUpper(ast.CurrentTimestamp)
}
}
}
func setNoDefaultValueFlag(c *table.Column, 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(ctx context.Context, c *table.Column, hasDefaultValue bool) error {
if !hasDefaultValue {
return nil
}
if c.DefaultValue != nil {
_, err := table.GetColDefaultValue(ctx, c.ToInfo())
if types.ErrTruncated.Equal(err) {
return types.ErrInvalidDefault.GenByArgs(c.Name)
}
return errors.Trace(err)
}
// Set not null but default null is invalid.
if mysql.HasNotNullFlag(c.Flag) {
return types.ErrInvalidDefault.GenByArgs(c.Name)
}
return nil
}
func checkDuplicateColumn(colDefs []*ast.ColumnDef) error {
colNames := map[string]bool{}
for _, colDef := range colDefs {
nameLower := colDef.Name.Name.L
if colNames[nameLower] {
return infoschema.ErrColumnExists.GenByArgs(colDef.Name.Name)
}
colNames[nameLower] = true
}
return nil
}
func checkGeneratedColumn(colDefs []*ast.ColumnDef) error {
var colName2Generation = make(map[string]columnGenerationInDDL, len(colDefs))
for i, colDef := range colDefs {
generated, depCols := findDependedColumnNames(colDef)
if !generated {
colName2Generation[colDef.Name.Name.L] = columnGenerationInDDL{
position: i,
generated: false,
}
} else {
colName2Generation[colDef.Name.Name.L] = columnGenerationInDDL{
position: i,
generated: true,
dependences: depCols,
}
}
}
for _, colDef := range colDefs {
colName := colDef.Name.Name.L
if err := verifyColumnGeneration(colName2Generation, colName); err != nil {
return errors.Trace(err)
}
}
return nil
}
func checkTooLongColumn(colDefs []*ast.ColumnDef) error {
for _, colDef := range colDefs {
if len(colDef.Name.Name.O) > mysql.MaxColumnNameLength {
return ErrTooLongIdent.Gen("too long column %s", colDef.Name.Name)
}
}
return nil
}
func checkTooManyColumns(colDefs []*ast.ColumnDef) error {
if len(colDefs) > TableColumnCountLimit {
return errTooManyFields
}
return nil
}
func checkDuplicateConstraint(namesMap map[string]bool, name string, foreign bool) error {
if name == "" {
return nil
}
nameLower := strings.ToLower(name)
if namesMap[nameLower] {
if foreign {
return infoschema.ErrCannotAddForeign
}
return errDupKeyName.Gen("duplicate key name %s", name)
}
namesMap[nameLower] = true
return nil
}
func setEmptyConstraintName(namesMap map[string]bool, constr *ast.Constraint, foreign bool) {
if constr.Name == "" && len(constr.Keys) > 0 {
colName := constr.Keys[0].Column.Name.L
constrName := colName
i := 2
if strings.EqualFold(constrName, mysql.PrimaryKeyName) {
constrName = fmt.Sprintf("%s_%d", constrName, 2)
i = 3
}
for namesMap[constrName] {
// We loop forever until we find constrName that haven't been used.
if foreign {
constrName = fmt.Sprintf("fk_%s_%d", colName, i)
} else {
constrName = fmt.Sprintf("%s_%d", colName, i)
}
i++
}
constr.Name = constrName
namesMap[constrName] = true
}
}
func checkConstraintNames(constraints []*ast.Constraint) error {
constrNames := map[string]bool{}
fkNames := map[string]bool{}
// Check not empty constraint name whether is duplicated.
for _, constr := range constraints {
if constr.Tp == ast.ConstraintForeignKey {
err := checkDuplicateConstraint(fkNames, constr.Name, true)
if err != nil {
return errors.Trace(err)
}
} else {
err := checkDuplicateConstraint(constrNames, constr.Name, false)
if err != nil {
return errors.Trace(err)
}
}
}
// Set empty constraint names.
for _, constr := range constraints {
if constr.Tp == ast.ConstraintForeignKey {
setEmptyConstraintName(fkNames, constr, true)
} else {
setEmptyConstraintName(constrNames, constr, false)
}
}
return nil
}
func (d *ddl) buildTableInfo(tableName model.CIStr, cols []*table.Column, constraints []*ast.Constraint, ctx context.Context) (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 {
v.ID = allocateColumnID(tbInfo)
tbInfo.Columns = append(tbInfo.Columns, v.ToInfo())
}
for _, constr := range constraints {
if constr.Tp == ast.ConstraintForeignKey {
for _, fk := range tbInfo.ForeignKeys {
if fk.Name.L == strings.ToLower(constr.Name) {
return nil, infoschema.ErrCannotAddForeign
}
}
var fk model.FKInfo
fk.Name = model.NewCIStr(constr.Name)
fk.RefTable = constr.Refer.Table.Name
fk.State = model.StatePublic
for _, key := range constr.Keys {
fk.Cols = append(fk.Cols, key.Column.Name)
}
for _, key := range constr.Refer.IndexColNames {
fk.RefCols = append(fk.RefCols, key.Column.Name)
}
fk.OnDelete = int(constr.Refer.OnDelete.ReferOpt)
fk.OnUpdate = int(constr.Refer.OnUpdate.ReferOpt)
if len(fk.Cols) != len(fk.RefCols) {
return nil, infoschema.ErrForeignKeyNotMatch.GenByArgs(tbInfo.Name.O)
}
if len(fk.Cols) == 0 {
// TODO: In MySQL, this case will report a parse error.
return nil, infoschema.ErrCannotAddForeign
}
tbInfo.ForeignKeys = append(tbInfo.ForeignKeys, &fk)
continue
}
if constr.Tp == ast.ConstraintPrimaryKey {
for _, key := range constr.Keys {
col := table.FindCol(cols, key.Column.Name.O)
if col == nil {
return nil, errKeyColumnDoesNotExits.Gen("key column %s doesn't exist in table", key.Column.Name)
}
// Virtual columns cannot be used in primary key.
if col.IsGenerated() && !col.GeneratedStored {
return nil, errUnsupportedOnGeneratedColumn.GenByArgs("Defining a virtual generated column as primary key")
}
}
if len(constr.Keys) == 1 {
key := constr.Keys[0]
col := table.FindCol(cols, key.Column.Name.O)
if col == nil {
return nil, errKeyColumnDoesNotExits.Gen("key column %s doesn't exist in table", key.Column.Name)
}
switch col.Tp {
case mysql.TypeLong, mysql.TypeLonglong,
mysql.TypeTiny, mysql.TypeShort, mysql.TypeInt24:
tbInfo.PKIsHandle = true
// Avoid creating index for PK handle column.
continue
}
}
}
// build index info.
idxInfo, err := buildIndexInfo(tbInfo, model.NewCIStr(constr.Name), constr.Keys, model.StatePublic)
if err != nil {
return nil, errors.Trace(err)
}
//check if the index is primary or uniqiue.
switch constr.Tp {
case ast.ConstraintPrimaryKey:
idxInfo.Primary = true
idxInfo.Unique = true
idxInfo.Name = model.NewCIStr(mysql.PrimaryKeyName)
case ast.ConstraintUniq, ast.ConstraintUniqKey, ast.ConstraintUniqIndex:
idxInfo.Unique = true
}
// set index type.
if constr.Option != nil {
idxInfo.Comment, err = validateCommentLength(ctx.GetSessionVars(),
constr.Option.Comment,
maxCommentLength,
errTooLongIndexComment.GenByArgs(idxInfo.Name.String(), maxCommentLength))
if err != nil {
return nil, errors.Trace(err)
}
if constr.Option.Tp == model.IndexTypeInvalid {
// Use btree as default index type.
idxInfo.Tp = model.IndexTypeBtree
} else {
idxInfo.Tp = constr.Option.Tp
}
} else {
// Use btree as default index type.
idxInfo.Tp = model.IndexTypeBtree
}
idxInfo.ID = allocateIndexID(tbInfo)
tbInfo.Indices = append(tbInfo.Indices, idxInfo)
}
return
}
func (d *ddl) CreateTableWithLike(ctx context.Context, ident, referIdent ast.Ident) error {
is := d.GetInformationSchema()
_, ok := is.SchemaByName(referIdent.Schema)
if !ok {
return infoschema.ErrTableNotExists.GenByArgs(referIdent.Schema, referIdent.Name)
}
referTbl, err := is.TableByName(referIdent.Schema, referIdent.Name)
if err != nil {
return infoschema.ErrTableNotExists.GenByArgs(referIdent.Schema, referIdent.Name)
}
schema, ok := is.SchemaByName(ident.Schema)
if !ok {
return infoschema.ErrDatabaseNotExists.GenByArgs(ident.Schema)
}
if is.TableExists(ident.Schema, ident.Name) {
return infoschema.ErrTableExists.GenByArgs(ident)
}
tblInfo := *referTbl.Meta()
tblInfo.Name = ident.Name
tblInfo.AutoIncID = 0
tblInfo.ForeignKeys = nil
tblInfo.ID, err = d.genGlobalID()
if err != nil {
return errors.Trace(err)
}
job := &model.Job{
SchemaID: schema.ID,
TableID: tblInfo.ID,
Type: model.ActionCreateTable,
BinlogInfo: &model.HistoryInfo{},
Args: []interface{}{tblInfo},
}
err = d.doDDLJob(ctx, job)
err = d.callHookOnChanged(err)
return errors.Trace(err)
}
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.ErrDatabaseNotExists.GenByArgs(ident.Schema)
}
if is.TableExists(ident.Schema, ident.Name) {
return infoschema.ErrTableExists.GenByArgs(ident)
}
if err = checkTooLongTable(ident.Name); err != nil {
return errors.Trace(err)
}
if err = checkDuplicateColumn(colDefs); err != nil {
return errors.Trace(err)
}
if err = checkGeneratedColumn(colDefs); err != nil {
return errors.Trace(err)
}
if err = checkTooLongColumn(colDefs); err != nil {
return errors.Trace(err)
}
if err = checkTooManyColumns(colDefs); err != nil {
return errors.Trace(err)
}
cols, newConstraints, err := 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, ctx)
if err != nil {
return errors.Trace(err)
}
job := &model.Job{
SchemaID: schema.ID,
TableID: tbInfo.ID,
Type: model.ActionCreateTable,
BinlogInfo: &model.HistoryInfo{},
Args: []interface{}{tbInfo},
}
handleTableOptions(options, tbInfo)
err = d.doDDLJob(ctx, job)
if err == nil {
if tbInfo.AutoIncID > 1 {
// Default tableAutoIncID base is 0.
// If the first id is expected to greater than 1, we need to do rebase.
err = d.handleAutoIncID(tbInfo, schema.ID)
}
}
err = d.callHookOnChanged(err)
return errors.Trace(err)
}
// handleAutoIncID handles auto_increment option in DDL. It creates a ID counter for the table and initiates the counter to a proper value.
// For example if the option sets auto_increment to 10. The counter will be set to 9. So the next allocated ID will be 10.
func (d *ddl) handleAutoIncID(tbInfo *model.TableInfo, schemaID int64) error {
if tbInfo.OldSchemaID != 0 {
schemaID = tbInfo.OldSchemaID
}
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(tbInfo.AutoIncID-1, false); err != nil {
return errors.Trace(err)
}
return nil
}
// handleTableOptions updates tableInfo according to table options.
func handleTableOptions(options []*ast.TableOption, tbInfo *model.TableInfo) {
for _, op := range options {
switch op.Tp {
case ast.TableOptionAutoIncrement:
tbInfo.AutoIncID = int64(op.UintValue)
case ast.TableOptionComment:
tbInfo.Comment = op.StrValue
case ast.TableOptionCharset:
tbInfo.Charset = op.StrValue
case ast.TableOptionCollate:
tbInfo.Collate = op.StrValue
}
}
}
func (d *ddl) AlterTable(ctx context.Context, ident ast.Ident, specs []*ast.AlterTableSpec) (err error) {
// Only handle valid specs, AlterTableLock is ignored.
validSpecs := make([]*ast.AlterTableSpec, 0, len(specs))
for _, spec := range specs {
if spec.Tp == ast.AlterTableLock {
continue
}
validSpecs = append(validSpecs, spec)
}
if len(validSpecs) != 1 {
// TODO: Hanlde len(validSpecs) == 0.
// Now we only allow one schema changing at the same time.
return errRunMultiSchemaChanges
}
for _, spec := range validSpecs {
switch spec.Tp {
case ast.AlterTableAddColumn:
err = d.AddColumn(ctx, ident, spec)
case ast.AlterTableDropColumn:
err = d.DropColumn(ctx, ident, spec.OldColumnName.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, constr.Option)
case ast.ConstraintUniq, ast.ConstraintUniqIndex, ast.ConstraintUniqKey:
err = d.CreateIndex(ctx, ident, true, model.NewCIStr(constr.Name), spec.Constraint.Keys, constr.Option)
case ast.ConstraintForeignKey:
err = d.CreateForeignKey(ctx, ident, model.NewCIStr(constr.Name), spec.Constraint.Keys, spec.Constraint.Refer)
case ast.ConstraintPrimaryKey:
err = ErrUnsupportedModifyPrimaryKey.GenByArgs("add")
default:
// Nothing to do now.
}
case ast.AlterTableDropForeignKey:
err = d.DropForeignKey(ctx, ident, model.NewCIStr(spec.Name))
case ast.AlterTableModifyColumn:
err = d.ModifyColumn(ctx, ident, spec)
case ast.AlterTableChangeColumn:
err = d.ChangeColumn(ctx, ident, spec)
case ast.AlterTableAlterColumn:
err = d.AlterColumn(ctx, ident, spec)
case ast.AlterTableRenameTable:
newIdent := ast.Ident{Schema: spec.NewTable.Schema, Name: spec.NewTable.Name}
err = d.RenameTable(ctx, ident, newIdent)
case ast.AlterTableDropPrimaryKey:
err = ErrUnsupportedModifyPrimaryKey.GenByArgs("drop")
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.ColumnOptionUniqKey:
return errUnsupportedAddColumn.Gen("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.NewColumn.Options)
if err != nil {
return errors.Trace(err)
}
is := d.infoHandle.Get()
schema, ok := is.SchemaByName(ti.Schema)
if !ok {
return errors.Trace(infoschema.ErrDatabaseNotExists)
}
t, err := is.TableByName(ti.Schema, ti.Name)
if err != nil {
return errors.Trace(infoschema.ErrTableNotExists.GenByArgs(ti.Schema, ti.Name))
}
// Check whether added column has existed.
colName := spec.NewColumn.Name.Name.O
col := table.FindCol(t.Cols(), colName)
if col != nil {
return infoschema.ErrColumnExists.GenByArgs(colName)
}
// If new column is a generated column, do validation.
// NOTE: Because now we can only append columns to table,
// we dont't need check whether the column refers other
// generated columns occurring later in table.
for _, option := range spec.NewColumn.Options {
if option.Tp == ast.ColumnOptionGenerated {
referableColNames := make(map[string]struct{}, len(t.Cols()))
for _, col := range t.Cols() {
referableColNames[col.Name.L] = struct{}{}
}
_, dependColNames := findDependedColumnNames(spec.NewColumn)
if err = columnNamesCover(referableColNames, dependColNames); err != nil {
return errors.Trace(err)
}
}
}
if len(colName) > mysql.MaxColumnNameLength {
return ErrTooLongIdent.Gen("too long column %s", colName)
}
// Ingore table constraints now, maybe return error later.
// We use length(t.Cols()) as the default offset firstly, we will change the
// column's offset later.
col, _, err = buildColumnAndConstraint(ctx, len(t.Cols()), spec.NewColumn)
if err != nil {
return errors.Trace(err)
}
col.OriginDefaultValue = col.DefaultValue
if col.OriginDefaultValue == nil && mysql.HasNotNullFlag(col.Flag) {
zeroVal := table.GetZeroValue(col.ToInfo())
col.OriginDefaultValue, err = zeroVal.ToString()
if err != nil {
return errors.Trace(err)
}
}
if col.OriginDefaultValue == strings.ToUpper(ast.CurrentTimestamp) &&
(col.Tp == mysql.TypeTimestamp || col.Tp == mysql.TypeDatetime) {
col.OriginDefaultValue = time.Now().Format(types.TimeFormat)
}
job := &model.Job{
SchemaID: schema.ID,
TableID: t.Meta().ID,
Type: model.ActionAddColumn,
BinlogInfo: &model.HistoryInfo{},
Args: []interface{}{col, spec.Position, 0},
}
err = d.doDDLJob(ctx, job)
err = d.callHookOnChanged(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.ErrDatabaseNotExists)
}
t, err := is.TableByName(ti.Schema, ti.Name)
if err != nil {
return errors.Trace(infoschema.ErrTableNotExists.GenByArgs(ti.Schema, ti.Name))
}
// Check whether dropped column has existed.
col := table.FindCol(t.Cols(), colName.L)
if col == nil {
return ErrCantDropFieldOrKey.Gen("column %s doesn't exist", colName)
}
tblInfo := t.Meta()
if err = isDroppableColumn(tblInfo, colName); err != nil {
return errors.Trace(err)
}
// We don't support dropping column with PK handle covered now.