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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 (
"bytes"
"fmt"
"strings"
"time"
"github.com/cznic/mathutil"
"github.com/pingcap/tidb/ast"
"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"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/charset"
"github.com/pkg/errors"
)
func (d *ddl) CreateSchema(ctx sessionctx.Context, schema model.CIStr, charsetInfo *ast.CharsetOpt) (err error) {
is := d.GetInformationSchema(ctx)
_, ok := is.SchemaByName(schema)
if ok {
return infoschema.ErrDatabaseExists.GenWithStackByArgs(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 {
err = checkCharsetAndCollation(charsetInfo.Chs, charsetInfo.Col)
if err != nil {
return errors.Trace(err)
}
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 sessionctx.Context, schema model.CIStr) (err error) {
is := d.GetInformationSchema(ctx)
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.GenWithStackByArgs(schema)
}
return nil
}
func checkTooLongTable(table model.CIStr) error {
if len(table.L) > mysql.MaxTableNameLength {
return ErrTooLongIdent.GenWithStackByArgs(table)
}
return nil
}
func checkTooLongIndex(index model.CIStr) error {
if len(index.L) > mysql.MaxIndexIdentifierLen {
return ErrTooLongIdent.GenWithStackByArgs(index)
}
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 sessionctx.Context, colDefs []*ast.ColumnDef,
constraints []*ast.Constraint) ([]*table.Column, []*ast.Constraint, error) {
var cols []*table.Column
colMap := map[string]*table.Column{}
// outPriKeyConstraint is the primary key constraint out of column definition. such as: create table t1 (id int , age int, primary key(id));
var outPriKeyConstraint *ast.Constraint
for _, v := range constraints {
if v.Tp == ast.ConstraintPrimaryKey {
outPriKeyConstraint = v
break
}
}
for i, colDef := range colDefs {
col, cts, err := buildColumnAndConstraint(ctx, i, colDef, outPriKeyConstraint)
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.GenWithStackByArgs(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
}
// outPriKeyConstraint is the primary key constraint out of column definition. such as: create table t1 (id int , age int, primary key(id));
func buildColumnAndConstraint(ctx sessionctx.Context, offset int,
colDef *ast.ColumnDef, outPriKeyConstraint *ast.Constraint) (*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, outPriKeyConstraint)
if err != nil {
return nil, nil, errors.Trace(err)
}
return col, cts, nil
}
// checkColumnDefaultValue checks the default value of the column.
// In non-strict SQL mode, if the default value of the column is an empty string, the default value can be ignored.
// In strict SQL mode, TEXT/BLOB/JSON can't have not null default values.
func checkColumnDefaultValue(ctx sessionctx.Context, col *table.Column, value interface{}) (bool, interface{}, error) {
hasDefaultValue := true
if value != nil && (col.Tp == mysql.TypeJSON ||
col.Tp == mysql.TypeTinyBlob || col.Tp == mysql.TypeMediumBlob ||
col.Tp == mysql.TypeLongBlob || col.Tp == mysql.TypeBlob) {
// In non-strict SQL mode.
if !ctx.GetSessionVars().SQLMode.HasStrictMode() && value == "" {
if col.Tp == mysql.TypeBlob || col.Tp == mysql.TypeLongBlob {
// The TEXT/BLOB default value can be ignored.
hasDefaultValue = false
}
// In non-strict SQL mode, if the column type is json and the default value is null, it is initialized to an empty array.
if col.Tp == mysql.TypeJSON {
value = `null`
}
sc := ctx.GetSessionVars().StmtCtx
sc.AppendWarning(errBlobCantHaveDefault.GenWithStackByArgs(col.Name.O))
return hasDefaultValue, value, nil
}
// In strict SQL mode or default value is not an empty string.
return hasDefaultValue, value, errBlobCantHaveDefault.GenWithStackByArgs(col.Name.O)
}
return hasDefaultValue, value, nil
}
// isExplicitTimeStamp is used to check if explicit_defaults_for_timestamp is on or off.
// Check out this link for more details.
// https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_explicit_defaults_for_timestamp
func isExplicitTimeStamp() bool {
// TODO: implement the behavior as MySQL when explicit_defaults_for_timestamp = off, then this function could return false.
return true
}
// columnDefToCol converts ColumnDef to Col and TableConstraints.
// outPriKeyConstraint is the primary key constraint out of column definition. such as: create table t1 (id int , age int, primary key(id));
func columnDefToCol(ctx sessionctx.Context, offset int, colDef *ast.ColumnDef, outPriKeyConstraint *ast.Constraint) (*table.Column, []*ast.Constraint, error) {
var constraints = make([]*ast.Constraint, 0)
col := table.ToColumn(&model.ColumnInfo{
Offset: offset,
Name: colDef.Name.Name,
FieldType: *colDef.Tp,
})
if !isExplicitTimeStamp() {
// Check and set TimestampFlag, OnUpdateNowFlag and NotNullFlag.
if col.Tp == mysql.TypeTimestamp {
col.Flag |= mysql.TimestampFlag
col.Flag |= mysql.OnUpdateNowFlag
col.Flag |= mysql.NotNullFlag
}
}
setOnUpdateNow := false
hasDefaultValue := false
hasNullFlag := false
if colDef.Options != nil {
length := types.UnspecifiedLength
keys := []*ast.IndexColName{
{
Column: colDef.Name,
Length: length,
},
}
for _, v := range colDef.Options {
switch v.Tp {
case ast.ColumnOptionNotNull:
col.Flag |= mysql.NotNullFlag
case ast.ColumnOptionNull:
col.Flag &= ^mysql.NotNullFlag
removeOnUpdateNowFlag(col)
hasNullFlag = true
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.GenWithStack("invalid default value - %s", err)
}
if hasDefaultValue, value, err = checkColumnDefaultValue(ctx, col, value); err != nil {
return nil, nil, errors.Trace(err)
}
if err = col.SetDefaultValue(value); err != nil {
return nil, nil, errors.Trace(err)
}
removeOnUpdateNowFlag(col)
case ast.ColumnOptionOnUpdate:
// TODO: Support other time functions.
if col.Tp == mysql.TypeTimestamp || col.Tp == mysql.TypeDatetime {
if !expression.IsCurrentTimestampExpr(v.Expr) {
return nil, nil, ErrInvalidOnUpdate.GenWithStackByArgs(col.Name)
}
} else {
return nil, nil, ErrInvalidOnUpdate.GenWithStackByArgs(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:
var buf = bytes.NewBuffer([]byte{})
v.Expr.Format(buf)
col.GeneratedExprString = buf.String()
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.FieldType.EvalType().IsStringKind() && 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
}
if col.Tp == mysql.TypeYear {
// For Year field, it's charset is binary but does not have binary flag.
col.Flag &= ^mysql.BinaryFlag
col.Flag |= mysql.ZerofillFlag
}
// If you specify ZEROFILL for a numeric column, MySQL automatically adds the UNSIGNED attribute to the column.
// See https://dev.mysql.com/doc/refman/5.7/en/numeric-type-overview.html for more details.
// But some types like bit and year, won't show its unsigned flag in `show create table`.
if mysql.HasZerofillFlag(col.Flag) {
col.Flag |= mysql.UnsignedFlag
}
err := checkPriKeyConstraint(col, hasDefaultValue, hasNullFlag, outPriKeyConstraint)
if err != nil {
return nil, nil, errors.Trace(err)
}
err = checkDefaultValue(ctx, col, hasDefaultValue)
if err != nil {
return nil, nil, errors.Trace(err)
}
return col, constraints, nil
}
func getDefaultValue(ctx sessionctx.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(ctx, c.Expr)
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(ctx.GetSessionVars().StmtCtx)
}
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.SetDefaultValue(types.ZeroDatetimeStr)
} else {
c.SetDefaultValue(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 sessionctx.Context, c *table.Column, hasDefaultValue bool) error {
if !hasDefaultValue {
return nil
}
if c.GetDefaultValue() != nil {
if _, err := table.GetColDefaultValue(ctx, c.ToInfo()); err != nil {
return types.ErrInvalidDefault.GenWithStackByArgs(c.Name)
}
return nil
}
// Primary key default null is invalid.
if mysql.HasPriKeyFlag(c.Flag) {
return ErrPrimaryCantHaveNull
}
// Set not null but default null is invalid.
if mysql.HasNotNullFlag(c.Flag) {
return types.ErrInvalidDefault.GenWithStackByArgs(c.Name)
}
return nil
}
// checkPriKeyConstraint check all parts of a PRIMARY KEY must be NOT NULL
func checkPriKeyConstraint(col *table.Column, hasDefaultValue, hasNullFlag bool, outPriKeyConstraint *ast.Constraint) error {
// Primary key should not be null.
if mysql.HasPriKeyFlag(col.Flag) && hasDefaultValue && col.GetDefaultValue() == nil {
return types.ErrInvalidDefault.GenWithStackByArgs(col.Name)
}
// Set primary key flag for outer primary key constraint.
// Such as: create table t1 (id int , age int, primary key(id))
if !mysql.HasPriKeyFlag(col.Flag) && outPriKeyConstraint != nil {
for _, key := range outPriKeyConstraint.Keys {
if key.Column.Name.L != col.Name.L {
continue
}
col.Flag |= mysql.PriKeyFlag
break
}
}
// Primary key should not be null.
if mysql.HasPriKeyFlag(col.Flag) && hasNullFlag {
return ErrPrimaryCantHaveNull
}
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.GenWithStackByArgs(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.GenWithStackByArgs(colDef.Name.Name)
}
}
return nil
}
func checkTooManyColumns(colDefs []*ast.ColumnDef) error {
if len(colDefs) > TableColumnCountLimit {
return errTooManyFields
}
return nil
}
// checkColumnsAttributes checks attributes for multiple columns.
func checkColumnsAttributes(colDefs []*ast.ColumnDef) error {
for _, colDef := range colDefs {
if err := checkColumnAttributes(colDef.Name.OrigColName(), colDef.Tp); err != nil {
return errors.Trace(err)
}
}
return nil
}
// checkColumnAttributes check attributes for single column.
func checkColumnAttributes(colName string, tp *types.FieldType) error {
switch tp.Tp {
case mysql.TypeNewDecimal, mysql.TypeDouble, mysql.TypeFloat:
if tp.Flen < tp.Decimal {
return types.ErrMBiggerThanD.GenWithStackByArgs(colName)
}
case mysql.TypeDatetime, mysql.TypeDuration, mysql.TypeTimestamp:
if tp.Decimal != types.UnspecifiedFsp && (tp.Decimal < types.MinFsp || tp.Decimal > types.MaxFsp) {
return types.ErrTooBigPrecision.GenWithStackByArgs(tp.Decimal, colName, types.MaxFsp)
}
}
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.GenWithStack("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 buildTableInfo(ctx sessionctx.Context, d *ddl, tableName model.CIStr, cols []*table.Column, constraints []*ast.Constraint) (tbInfo *model.TableInfo, err error) {
tbInfo = &model.TableInfo{
Name: tableName,
}
// When this function is called by MockTableInfo, we should set a particular table id.
// So the `ddl` structure may be nil.
if d != nil {
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.GenWithStackByArgs(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 {
var col *table.Column
for _, key := range constr.Keys {
col = table.FindCol(cols, key.Column.Name.O)
if col == nil {
return nil, errKeyColumnDoesNotExits.GenWithStack("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.GenWithStackByArgs("Defining a virtual generated column as primary key")
}
}
if len(constr.Keys) == 1 {
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.GenWithStackByArgs(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 sessionctx.Context, ident, referIdent ast.Ident, ifNotExists bool) error {
is := d.GetInformationSchema(ctx)
_, ok := is.SchemaByName(referIdent.Schema)
if !ok {
return infoschema.ErrTableNotExists.GenWithStackByArgs(referIdent.Schema, referIdent.Name)
}
referTbl, err := is.TableByName(referIdent.Schema, referIdent.Name)
if err != nil {
return infoschema.ErrTableNotExists.GenWithStackByArgs(referIdent.Schema, referIdent.Name)
}
schema, ok := is.SchemaByName(ident.Schema)
if !ok {
return infoschema.ErrDatabaseNotExists.GenWithStackByArgs(ident.Schema)
}
if is.TableExists(ident.Schema, ident.Name) {
if ifNotExists {
ctx.GetSessionVars().StmtCtx.AppendNote(infoschema.ErrTableExists.GenWithStackByArgs(ident))
return nil
}
return infoschema.ErrTableExists.GenWithStackByArgs(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 sessionctx.Context, s *ast.CreateTableStmt) (err error) {
ident := ast.Ident{Schema: s.Table.Schema, Name: s.Table.Name}
if s.ReferTable != nil {
referIdent := ast.Ident{Schema: s.ReferTable.Schema, Name: s.ReferTable.Name}
return d.CreateTableWithLike(ctx, ident, referIdent, s.IfNotExists)
}
colDefs := s.Cols
is := d.GetInformationSchema(ctx)
schema, ok := is.SchemaByName(ident.Schema)
if !ok {
return infoschema.ErrDatabaseNotExists.GenWithStackByArgs(ident.Schema)
}
if is.TableExists(ident.Schema, ident.Name) {
if s.IfNotExists {
ctx.GetSessionVars().StmtCtx.AppendNote(infoschema.ErrTableExists.GenWithStackByArgs(ident))
return nil
}
return infoschema.ErrTableExists.GenWithStackByArgs(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)
}
if err = checkColumnsAttributes(colDefs); err != nil {
return errors.Trace(err)
}
cols, newConstraints, err := buildColumnsAndConstraints(ctx, colDefs, s.Constraints)
if err != nil {
return errors.Trace(err)
}
err = checkConstraintNames(newConstraints)
if err != nil {
return errors.Trace(err)
}
tbInfo, err := buildTableInfo(ctx, d, ident.Name, cols, newConstraints)
if err != nil {
return errors.Trace(err)
}
pi, err := buildTablePartitionInfo(ctx, d, s)
if err != nil {
return errors.Trace(err)
}
if pi != nil && pi.Type == model.PartitionTypeRange {
// Only range type partition is now supported.
// Range columns partition only implements the parser, so it will not be checked.
if s.Partition.ColumnNames == nil {
if err = checkPartitionNameUnique(tbInfo, pi); err != nil {
return errors.Trace(err)
}
if err = checkCreatePartitionValue(ctx, tbInfo, pi, cols); err != nil {
return errors.Trace(err)
}
if err = checkAddPartitionTooManyPartitions(len(pi.Definitions)); err != nil {
return errors.Trace(err)
}
if err = checkPartitionFuncValid(ctx, tbInfo, s.Partition.Expr); err != nil {
return errors.Trace(err)
}
if err = checkPartitionFuncType(ctx, s, cols, tbInfo); err != nil {
return errors.Trace(err)
}
if err = checkRangePartitioningKeysConstraints(ctx, s, tbInfo, newConstraints); err != nil {
return errors.Trace(err)
}
}
tbInfo.Partition = pi
}
job := &model.Job{
SchemaID: schema.ID,
TableID: tbInfo.ID,
Type: model.ActionCreateTable,
BinlogInfo: &model.HistoryInfo{},
Args: []interface{}{tbInfo},
}
err = handleTableOptions(s.Options, tbInfo)
if err != nil {
return errors.Trace(err)
}
err = checkCharsetAndCollation(tbInfo.Charset, tbInfo.Collate)
if err != nil {
return errors.Trace(err)
}
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)
}
}
// table exists, but if_not_exists flags is true, so we ignore this error.
if infoschema.ErrTableExists.Equal(err) && s.IfNotExists {
return nil
}
err = d.callHookOnChanged(err)
return errors.Trace(err)
}
func checkCharsetAndCollation(cs string, co string) error {
if !charset.ValidCharsetAndCollation(cs, co) {
return ErrUnknownCharacterSet.GenWithStackByArgs(cs)
}
return nil
}
// 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 {
alloc := autoid.NewAllocator(d.store, tbInfo.GetDBID(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(nil, 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) error {