model

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 Go to latest Published: Nov 13, 2017 License: Apache-2.0 Imports: 8 Imported by: 0

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Constants

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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

This section is empty.

Functions

This section is empty.

Types

type ActionType 

type ActionType byte

ActionType is the type for DDL action. 

const (
	ActionNone ActionType = iota
	ActionCreateSchema
	ActionDropSchema
	ActionCreateTable
	ActionDropTable
	ActionAddColumn
	ActionDropColumn
	ActionAddIndex
	ActionDropIndex
	ActionAddForeignKey
	ActionDropForeignKey
	ActionTruncateTable
	ActionModifyColumn
	ActionRenameTable
	ActionSetDefaultValue
)

List DDL actions.

func (ActionType) String 

func (action ActionType) String() 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 (*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
}

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"`
	// LastUpdateTS now uses unix nano seconds
	// TODO: Use timestamp allocated by TSO.
	LastUpdateTS int64 `json:"last_update_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) 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 (
	JobNone JobState = iota
	JobRunning
	// When DDL encountered an unrecoverable error at reorganization state,
	// some keys has been added already, we need to remove them.
	// JobRollingback is the state to do the rolling back job.
	JobRollingback
	JobRollbackDone
	JobDone
	JobCancelled
	// JobSynced is used to mark the information about the completion of this job
	// has been synchronized to all servers.
	JobSynced
	// JobCancelling is used to mark the DDL job is cancelled by the client, but the DDL work hasn't handle it.
	JobCancelling
)

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"`
	// 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.
	OldSchemaID int64 `json:"old_schema_id,omitempty"`
}

TableInfo provides meta data describing a DB table.

func (*TableInfo) Clone 

func (t *TableInfo) Clone() *TableInfo

Clone clones TableInfo.

func (*TableInfo) ColumnIsInIndex 

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

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

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.

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