model

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 Go to latest Published: Mar 22, 2018 License: Apache-2.0 Imports: 9 Imported by: 0

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Index

Constants

View Source 
const ExtraHandleID = -1

ExtraHandleID is the column ID of column which we need to append to schema to occupy the handle's position for use of execution phase.

Variables

View Source 
var ExtraHandleName = NewCIStr("_tidb_rowid")

ExtraHandleName is the name of ExtraHandle Column.

Functions

This section is empty.

Types

type ActionType 

type ActionType byte

ActionType is the type for DDL action. 

const (
	ActionNone            ActionType = 0
	ActionCreateSchema    ActionType = 1
	ActionDropSchema      ActionType = 2
	ActionCreateTable     ActionType = 3
	ActionDropTable       ActionType = 4
	ActionAddColumn       ActionType = 5
	ActionDropColumn      ActionType = 6
	ActionAddIndex        ActionType = 7
	ActionDropIndex       ActionType = 8
	ActionAddForeignKey   ActionType = 9
	ActionDropForeignKey  ActionType = 10
	ActionTruncateTable   ActionType = 11
	ActionModifyColumn    ActionType = 12
	ActionRebaseAutoID    ActionType = 13
	ActionRenameTable     ActionType = 14
	ActionSetDefaultValue ActionType = 15
	ActionShardRowID      ActionType = 16
)

List DDL actions.

func (ActionType) String 

func (action ActionType) String() string

String return current ddl action in string

type CIStr 

type CIStr struct {
	O string `json:"O"` // Original string.
	L string `json:"L"` // Lower case string.
}

CIStr is case insensitive string.

func NewCIStr 

func NewCIStr(s string) (cs CIStr)

NewCIStr creates a new CIStr.

func (CIStr) String 

func (cis CIStr) String() string

String implements fmt.Stringer interface.

type ColumnInfo 

type ColumnInfo struct {
	ID                  int64               `json:"id"`
	Name                CIStr               `json:"name"`
	Offset              int                 `json:"offset"`
	OriginDefaultValue  interface{}         `json:"origin_default"`
	DefaultValue        interface{}         `json:"default"`
	GeneratedExprString string              `json:"generated_expr_string"`
	GeneratedStored     bool                `json:"generated_stored"`
	Dependences         map[string]struct{} `json:"dependences"`
	types.FieldType     `json:"type"`
	State               SchemaState `json:"state"`
	Comment             string      `json:"comment"`
}

ColumnInfo provides meta data describing of a table column.

func NewExtraHandleColInfo 

func NewExtraHandleColInfo() *ColumnInfo

NewExtraHandleColInfo mocks a column info for extra handle column.

func (*ColumnInfo) Clone 

func (c *ColumnInfo) Clone() *ColumnInfo

Clone clones ColumnInfo.

func (*ColumnInfo) IsGenerated 

func (c *ColumnInfo) IsGenerated() bool

IsGenerated returns true if the column is generated column.

type DBInfo 

type DBInfo struct {
	ID      int64        `json:"id"`      // Database ID
	Name    CIStr        `json:"db_name"` // DB name.
	Charset string       `json:"charset"`
	Collate string       `json:"collate"`
	Tables  []*TableInfo `json:"-"` // Tables in the DB.
	State   SchemaState  `json:"state"`
}

DBInfo provides meta data describing a DB.

func (*DBInfo) Clone 

func (db *DBInfo) Clone() *DBInfo

Clone clones DBInfo.

type FKInfo 

type FKInfo struct {
	ID       int64       `json:"id"`
	Name     CIStr       `json:"fk_name"`
	RefTable CIStr       `json:"ref_table"`
	RefCols  []CIStr     `json:"ref_cols"`
	Cols     []CIStr     `json:"cols"`
	OnDelete int         `json:"on_delete"`
	OnUpdate int         `json:"on_update"`
	State    SchemaState `json:"state"`
}

FKInfo provides meta data describing a foreign key constraint.

func (*FKInfo) Clone 

func (fk *FKInfo) Clone() *FKInfo

Clone clones FKInfo.

type HistoryInfo 

type HistoryInfo struct {
	SchemaVersion int64
	DBInfo        *DBInfo
	TableInfo     *TableInfo
	FinishedTS    uint64
}

HistoryInfo is used for binlog.

func (*HistoryInfo) AddDBInfo 

func (h *HistoryInfo) AddDBInfo(schemaVer int64, dbInfo *DBInfo)

AddDBInfo adds schema version and schema information that are used for binlog. dbInfo is added in the following operations: create database, drop database.

func (*HistoryInfo) AddTableInfo 

func (h *HistoryInfo) AddTableInfo(schemaVer int64, tblInfo *TableInfo)

AddTableInfo adds schema version and table information that are used for binlog. tblInfo is added except for the following operations: create database, drop database.

func (*HistoryInfo) Clean 

func (h *HistoryInfo) Clean()

Clean cleans history information.

type IndexColumn 

type IndexColumn struct {
	Name   CIStr `json:"name"`   // Index name
	Offset int   `json:"offset"` // Index offset
	// Length of prefix when using column prefix
	// for indexing;
	// UnspecifedLength if not using prefix indexing
	Length int `json:"length"`
}

IndexColumn provides index column info.

func (*IndexColumn) Clone 

func (i *IndexColumn) Clone() *IndexColumn

Clone clones IndexColumn.

type IndexInfo 

type IndexInfo struct {
	ID      int64          `json:"id"`
	Name    CIStr          `json:"idx_name"`   // Index name.
	Table   CIStr          `json:"tbl_name"`   // Table name.
	Columns []*IndexColumn `json:"idx_cols"`   // Index columns.
	Unique  bool           `json:"is_unique"`  // Whether the index is unique.
	Primary bool           `json:"is_primary"` // Whether the index is primary key.
	State   SchemaState    `json:"state"`
	Comment string         `json:"comment"`    // Comment
	Tp      IndexType      `json:"index_type"` // Index type: Btree or Hash
}

IndexInfo provides meta data describing a DB index. It corresponds to the statement `CREATE INDEX Name ON Table (Column);` See https://dev.mysql.com/doc/refman/5.7/en/create-index.html

func (*IndexInfo) Clone 

func (index *IndexInfo) Clone() *IndexInfo

Clone clones IndexInfo.

func (*IndexInfo) HasPrefixIndex 

func (index *IndexInfo) HasPrefixIndex() bool

HasPrefixIndex returns whether any columns of this index uses prefix length.

type IndexType 

type IndexType int

IndexType is the type of index 

const (
	IndexTypeInvalid IndexType = iota
	IndexTypeBtree
	IndexTypeHash
)

IndexTypes

func (IndexType) String 

func (t IndexType) String() string

String implements Stringer interface.

type Job 

type Job struct {
	ID       int64         `json:"id"`
	Type     ActionType    `json:"type"`
	SchemaID int64         `json:"schema_id"`
	TableID  int64         `json:"table_id"`
	State    JobState      `json:"state"`
	Error    *terror.Error `json:"err"`
	// ErrorCount will be increased, every time we meet an error when running job.
	ErrorCount int64 `json:"err_count"`
	// RowCount means the number of rows that are processed.
	RowCount int64         `json:"row_count"`
	Mu       sync.Mutex    `json:"-"`
	Args     []interface{} `json:"-"`
	// RawArgs : We must use json raw message to delay parsing special args.
	RawArgs     json.RawMessage `json:"raw_args"`
	SchemaState SchemaState     `json:"schema_state"`
	// SnapshotVer means snapshot version for this job.
	SnapshotVer uint64 `json:"snapshot_ver"`
	// StartTS uses timestamp allocated by TSO.
	// Now it's the TS when we put the job to TiKV queue.
	StartTS uint64 `json:"start_ts"`
	// Query string of the ddl job.
	Query      string       `json:"query"`
	BinlogInfo *HistoryInfo `json:"binlog"`

	// Version indicates the DDL job version. For old jobs, it will be 0.
	Version int64 `json:"version"`
}

Job is for a DDL operation.

func (*Job) Decode 

func (job *Job) Decode(b []byte) error

Decode decodes job from the json buffer, we must use DecodeArgs later to decode special args for this job.

func (*Job) DecodeArgs 

func (job *Job) DecodeArgs(args ...interface{}) error

DecodeArgs decodes job args.

func (*Job) Encode 

func (job *Job) Encode(updateRawArgs bool) ([]byte, error)

Encode encodes job with json format. updateRawArgs is used to determine whether to update the raw args.

func (*Job) FinishDBJob 

func (job *Job) FinishDBJob(jobState JobState, schemaState SchemaState, ver int64, dbInfo *DBInfo)

FinishDBJob is called when a job is finished. It updates the job's state information and adds dbInfo the binlog.

func (*Job) FinishTableJob 

func (job *Job) FinishTableJob(jobState JobState, schemaState SchemaState, ver int64, tblInfo *TableInfo)

FinishTableJob is called when a job is finished. It updates the job's state information and adds tblInfo to the binlog.

func (*Job) GetRowCount 

func (job *Job) GetRowCount() int64

GetRowCount gets the number of rows. Make sure it can pass `make race`.

func (*Job) IsCancelled 

func (job *Job) IsCancelled() bool

IsCancelled returns whether the job is cancelled or not.

func (*Job) IsCancelling 

func (job *Job) IsCancelling() bool

IsCancelling returns whether the job is cancelling or not.

func (*Job) IsDone 

func (job *Job) IsDone() bool

IsDone returns whether job is done.

func (*Job) IsFinished 

func (job *Job) IsFinished() bool

IsFinished returns whether job is finished or not. If the job state is Done or Cancelled, it is finished.

func (*Job) IsRollingback 

func (job *Job) IsRollingback() bool

IsRollingback returns whether the job is rolling back or not.

func (*Job) IsRunning 

func (job *Job) IsRunning() bool

IsRunning returns whether job is still running or not.

func (*Job) IsSynced 

func (job *Job) IsSynced() bool

IsSynced returns whether the DDL modification is synced among all TiDB servers.

func (*Job) SetRowCount 

func (job *Job) SetRowCount(count int64)

SetRowCount sets the number of rows. Make sure it can pass `make race`.

func (*Job) String 

func (job *Job) String() string

String implements fmt.Stringer interface.

type JobState 

type JobState byte

JobState is for job state. 

const (
	JobStateNone    JobState = 0
	JobStateRunning JobState = 1
	// When DDL encountered an unrecoverable error at reorganization state,
	// some keys has been added already, we need to remove them.
	// JobStateRollingback is the state to do the rolling back job.
	JobStateRollingback  JobState = 2
	JobStateRollbackDone JobState = 3
	JobStateDone         JobState = 4
	JobStateCancelled    JobState = 5
	// JobStateSynced is used to mark the information about the completion of this job
	// has been synchronized to all servers.
	JobStateSynced JobState = 6
	// JobStateCancelling is used to mark the DDL job is cancelled by the client, but the DDL work hasn't handle it.
	JobStateCancelling JobState = 7
)

List job states.

func (JobState) String 

func (s JobState) String() string

String implements fmt.Stringer interface.

type SchemaDiff 

type SchemaDiff struct {
	Version  int64      `json:"version"`
	Type     ActionType `json:"type"`
	SchemaID int64      `json:"schema_id"`
	TableID  int64      `json:"table_id"`

	// OldTableID is the table ID before truncate, only used by truncate table DDL.
	OldTableID int64 `json:"old_table_id"`
	// OldSchemaID is the schema ID before rename table, only used by rename table DDL.
	OldSchemaID int64 `json:"old_schema_id"`
}

SchemaDiff contains the schema modification at a particular schema version. It is used to reduce schema reload cost.

type SchemaState 

type SchemaState byte

SchemaState is the state for schema elements. 

const (
	// StateNone means this schema element is absent and can't be used.
	StateNone SchemaState = iota
	// StateDeleteOnly means we can only delete items for this schema element.
	StateDeleteOnly
	// StateWriteOnly means we can use any write operation on this schema element,
	// but outer can't read the changed data.
	StateWriteOnly
	// StateWriteReorganization means we are re-organizating whole data after write only state.
	StateWriteReorganization
	// StateDeleteReorganization means we are re-organizating whole data after delete only state.
	StateDeleteReorganization
	// StatePublic means this schema element is ok for all write and read operations.
	StatePublic
)

func (SchemaState) String 

func (s SchemaState) String() string

String implements fmt.Stringer interface.

type TableInfo 

type TableInfo struct {
	ID      int64  `json:"id"`
	Name    CIStr  `json:"name"`
	Charset string `json:"charset"`
	Collate string `json:"collate"`
	// Columns are listed in the order in which they appear in the schema.
	Columns     []*ColumnInfo `json:"cols"`
	Indices     []*IndexInfo  `json:"index_info"`
	ForeignKeys []*FKInfo     `json:"fk_info"`
	State       SchemaState   `json:"state"`
	PKIsHandle  bool          `json:"pk_is_handle"`
	Comment     string        `json:"comment"`
	AutoIncID   int64         `json:"auto_inc_id"`
	MaxColumnID int64         `json:"max_col_id"`
	MaxIndexID  int64         `json:"max_idx_id"`
	// UpdateTS is used to record the timestamp of updating the table's schema information.
	// These changing schema operations don't include 'truncate table' and 'rename table'.
	UpdateTS uint64 `json:"update_timestamp"`
	// OldSchemaID :
	// Because auto increment ID has schemaID as prefix,
	// We need to save original schemaID to keep autoID unchanged
	// while renaming a table from one database to another.
	// TODO: Remove it.
	// Now it only uses for compatibility with the old version that already uses this field.
	OldSchemaID int64 `json:"old_schema_id,omitempty"`

	// ShardRowIDBits specify if the implicit row ID is sharded.
	ShardRowIDBits uint64
}

TableInfo provides meta data describing a DB table.

func (*TableInfo) Clone 

func (t *TableInfo) Clone() *TableInfo

Clone clones TableInfo.

func (*TableInfo) Cols 

func (t *TableInfo) Cols() []*ColumnInfo

Cols returns the columns of the table in public state.

func (*TableInfo) ColumnIsInIndex 

func (t *TableInfo) ColumnIsInIndex(c *ColumnInfo) bool

ColumnIsInIndex checks whether c is included in any indices of t.

func (*TableInfo) GetDBID 

func (t *TableInfo) GetDBID(dbID int64) int64

GetDBID returns the schema ID that is used to create an allocator. TODO: Remove it after removing OldSchemaID.

func (*TableInfo) GetPkColInfo 

func (t *TableInfo) GetPkColInfo() *ColumnInfo

GetPkColInfo gets the ColumnInfo of pk if exists. Make sure PkIsHandle checked before call this method.

func (*TableInfo) GetPkName 

func (t *TableInfo) GetPkName() CIStr

GetPkName will return the pk name if pk exists.

func (*TableInfo) GetUpdateTime 

func (t *TableInfo) GetUpdateTime() time.Time

GetUpdateTime gets the table's updating time.

Source Files

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