ddl

Documentation

Index

• Variables
• type BaseCallback
  • func (c *BaseCallback) OnBgJobUpdated(job *model.Job)
  • func (c *BaseCallback) OnChanged(err error) error
  • func (c *BaseCallback) OnJobRunBefore(job *model.Job)
  • func (c *BaseCallback) OnJobUpdated(job *model.Job)
• type Callback
• type DDL
  • func NewDDL(store kv.Storage, infoHandle *infoschema.Handle, hook Callback, ...) DDL
• type Event
  • func (e *Event) String() string
• type JobType
  • func (j JobType) String() string

Variables

var (

	// ErrInvalidDBState returns for invalid database state.
	ErrInvalidDBState = terror.ClassDDL.New(codeInvalidDBState, "invalid database state")
	// ErrInvalidTableState returns for invalid Table state.
	ErrInvalidTableState = terror.ClassDDL.New(codeInvalidTableState, "invalid table state")
	// ErrInvalidColumnState returns for invalid column state.
	ErrInvalidColumnState = terror.ClassDDL.New(codeInvalidColumnState, "invalid column state")
	// ErrInvalidIndexState returns for invalid index state.
	ErrInvalidIndexState = terror.ClassDDL.New(codeInvalidIndexState, "invalid index state")
	// ErrInvalidForeignKeyState returns for invalid foreign key state.
	ErrInvalidForeignKeyState = terror.ClassDDL.New(codeInvalidForeignKeyState, "invalid foreign key state")
	// ErrUnsupportedModifyPrimaryKey returns an error when add or drop the primary key.
	// It's exported for testing.
	ErrUnsupportedModifyPrimaryKey = terror.ClassDDL.New(codeUnsupportedModifyPrimaryKey, "unsupported %s primary key")

	// ErrColumnBadNull returns for a bad null value.
	ErrColumnBadNull = terror.ClassDDL.New(codeBadNull, "column cann't be null")
	// ErrCantRemoveAllFields returns for deleting all columns.
	ErrCantRemoveAllFields = terror.ClassDDL.New(codeCantRemoveAllFields, "can't delete all columns with ALTER TABLE")
	// ErrCantDropFieldOrKey returns for dropping a non-existent field or key.
	ErrCantDropFieldOrKey = terror.ClassDDL.New(codeCantDropFieldOrKey, "can't drop field; check that column/key exists")
	// ErrInvalidOnUpdate returns for invalid ON UPDATE clause.
	ErrInvalidOnUpdate = terror.ClassDDL.New(codeInvalidOnUpdate, "invalid ON UPDATE clause for the column")
	// ErrTooLongIdent returns for too long name of database/table/column.
	ErrTooLongIdent = terror.ClassDDL.New(codeTooLongIdent, "Identifier name too long")
)

var RunWorker = true

RunWorker indicates if this TiDB server starts DDL worker and can run DDL job.

Types

type BaseCallback

type BaseCallback struct {
}

BaseCallback implements Callback.OnChanged interface.

func (*BaseCallback) OnBgJobUpdated

func (c *BaseCallback) OnBgJobUpdated(job *model.Job)

OnBgJobUpdated implements Callback.OnBgJobUpdated interface.

func (*BaseCallback) OnChanged

func (c *BaseCallback) OnChanged(err error) error

OnChanged implements Callback interface.

func (*BaseCallback) OnJobRunBefore

func (c *BaseCallback) OnJobRunBefore(job *model.Job)

OnJobRunBefore implements Callback.OnJobRunBefore interface.

func (*BaseCallback) OnJobUpdated

func (c *BaseCallback) OnJobUpdated(job *model.Job)

OnJobUpdated implements Callback.OnJobUpdated interface.

type Callback

type Callback interface {
	// OnChanged is called after schema is changed.
	OnChanged(err error) error
	// OnJobRunBefore is called before running job.
	OnJobRunBefore(job *model.Job)
	// OnJobUpdated is called after the running job is updated.
	OnJobUpdated(job *model.Job)
	// OnBgJobUpdated is called after the running background job is updated.
	OnBgJobUpdated(job *model.Job)
}

Callback is the interface supporting callback function when DDL changed.

type DDL

type DDL interface {
	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
	CreateTableWithLike(ctx context.Context, ident, referIdent ast.Ident) 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
	TruncateTable(ctx context.Context, tableIdent ast.Ident) error
	RenameTable(ctx context.Context, oldTableIdent, newTableIdent ast.Ident) 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
	// RegisterEventCh registers event channel for ddl.
	RegisterEventCh(chan<- *Event)
}

DDL is responsible for updating schema in data store and maintaining in-memory InfoSchema cache.

func NewDDL

func NewDDL(store kv.Storage, infoHandle *infoschema.Handle, hook Callback, lease time.Duration) DDL

NewDDL creates a new DDL.

type Event

type Event struct {
	Tp         model.ActionType
	TableInfo  *model.TableInfo
	ColumnInfo *model.ColumnInfo
	IndexInfo  *model.IndexInfo
}

Event is an event that a ddl operation happened.

func (*Event) String

func (e *Event) String() string

String implements fmt.Stringer interface.

type JobType

type JobType int

JobType is job type, including ddl/background.

func (JobType) String

func (j JobType) String() string