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Index ¶
Constants ¶
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const ( AlterTableOpt int = iota + 1 AlterAddColumn AlterAddConstr AlterDropColumn AlterDropPrimaryKey AlterDropIndex AlterDropForeignKey )
AlterTableSpecification.Action types.
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const ( ColumnPositionNone int = iota ColumnPositionFirst ColumnPositionAfter )
ColumnPosition Types
Variables ¶
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var ( // ErrExists returned for creating an exist schema or table. ErrExists = errors.Errorf("DDL:exists") // ErrNotExists returned for dropping a not exist schema or table. ErrNotExists = errors.Errorf("DDL:not exists") )
Pre-defined errors
Functions ¶
This section is empty.
Types ¶
type AlterSpecification ¶
type AlterSpecification struct {
Action int
Name string
Constraint *coldef.TableConstraint
TableOpts []*coldef.TableOpt
Column *coldef.ColumnDef
Position *ColumnPosition
}
AlterSpecification alter table specification
func (*AlterSpecification) String ¶
func (as *AlterSpecification) String() string
String implements fmt.Stringer
type ColumnPosition ¶
type ColumnPosition struct {
// ColumnPositionNone | ColumnPositionFirst | ColumnPositionAfter
Type int
// RelativeColumn is the column the newly added column after if type is ColumnPositionAfter
RelativeColumn string
}
ColumnPosition represent the position of the newly added column
func (*ColumnPosition) String ¶
func (cp *ColumnPosition) String() string
String implements fmt.Stringer
type DDL ¶
type DDL interface {
CreateSchema(ctx context.Context, name model.CIStr) error
DropSchema(ctx context.Context, schema model.CIStr) error
CreateTable(ctx context.Context, ident table.Ident, cols []*coldef.ColumnDef, constrs []*coldef.TableConstraint) error
DropTable(ctx context.Context, tableIdent table.Ident) (err error)
CreateIndex(ctx context.Context, tableIdent table.Ident, unique bool, indexName model.CIStr, columnNames []*coldef.IndexColName) error
DropIndex(ctx context.Context, schema, tableName, indexName model.CIStr) error
GetInformationSchema() infoschema.InfoSchema
AlterTable(ctx context.Context, tableIdent table.Ident, spec []*AlterSpecification) error
}
DDL is responsible for updating schema in data store and maintain in-memory InfoSchema cache.
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