table

package
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 Go to latest Published: Sep 14, 2018 License: Apache-2.0 Imports: 17 Imported by: 1,864

Documentation

Index

Constants

View Source 
const (
	// DirtyTableAddRow is the constant for dirty table operation type.
	DirtyTableAddRow = iota
	// DirtyTableDeleteRow is the constant for dirty table operation type.
	DirtyTableDeleteRow
	// DirtyTableTruncate is the constant for dirty table operation type.
	DirtyTableTruncate
)

Variables

View Source 
var (
	// ErrColumnCantNull is used for inserting null to a not null column.
	ErrColumnCantNull = terror.ClassTable.New(codeColumnCantNull, mysql.MySQLErrName[mysql.ErrBadNull])

	// ErrNoDefaultValue is used when insert a row, the column value is not given, and the column has not null flag
	// and it doesn't have a default value.
	ErrNoDefaultValue = terror.ClassTable.New(codeNoDefaultValue, "field doesn't have a default value")
	// ErrIndexOutBound returns for index column offset out of bound.
	ErrIndexOutBound = terror.ClassTable.New(codeIndexOutBound, "index column offset out of bound")
	// ErrUnsupportedOp returns for unsupported operation.
	ErrUnsupportedOp = terror.ClassTable.New(codeUnsupportedOp, "operation not supported")
	// ErrRowNotFound returns for row not found.
	ErrRowNotFound = terror.ClassTable.New(codeRowNotFound, "can not find the row")
	// ErrTableStateCantNone returns for table none state.
	ErrTableStateCantNone = terror.ClassTable.New(codeTableStateCantNone, "table can not be in none state")
	// ErrColumnStateCantNone returns for column none state.
	ErrColumnStateCantNone = terror.ClassTable.New(codeColumnStateCantNone, "column can not be in none state")
	// ErrColumnStateNonPublic returns for column non-public state.
	ErrColumnStateNonPublic = terror.ClassTable.New(codeColumnStateNonPublic, "can not use non-public column")
	// ErrIndexStateCantNone returns for index none state.
	ErrIndexStateCantNone = terror.ClassTable.New(codeIndexStateCantNone, "index can not be in none state")
	// ErrInvalidRecordKey returns for invalid record key.
	ErrInvalidRecordKey = terror.ClassTable.New(codeInvalidRecordKey, "invalid record key")
	// ErrTruncateWrongValue returns for truncate wrong value for field.
	ErrTruncateWrongValue = terror.ClassTable.New(codeTruncateWrongValue, "incorrect value")
	// ErrTruncatedWrongValueForField returns for truncate wrong value for field.
	ErrTruncatedWrongValueForField = terror.ClassTable.New(codeTruncateWrongValue, mysql.MySQLErrName[mysql.ErrTruncatedWrongValueForField])
	// ErrTrgInvalidCreationCtx happens when inserting a value outside the table partitions.
	ErrTrgInvalidCreationCtx = terror.ClassTable.New(codeTrgInvalidCreationCtx, "locate partition failed")
)
View Source 
var MockTableFromMeta func(tableInfo *model.TableInfo) Table

MockTableFromMeta only serves for test.

View Source 
var TableFromMeta func(alloc autoid.Allocator, tblInfo *model.TableInfo) (Table, error)

TableFromMeta builds a table.Table from *model.TableInfo. Currently, it is assigned to tables.TableFromMeta in tidb package's init function.

Functions

func CastValue 

func CastValue(ctx sessionctx.Context, val types.Datum, col *model.ColumnInfo) (casted types.Datum, err error)

CastValue casts a value based on column type.

func CastValues 

func CastValues(ctx sessionctx.Context, rec []types.Datum, cols []*Column) (err error)

CastValues casts values based on columns type.

func CheckNotNull 

func CheckNotNull(cols []*Column, row []types.Datum) error

CheckNotNull checks if row has nil value set to a column with NotNull flag set.

func CheckOnce 

func CheckOnce(cols []*Column) error

CheckOnce checks if there are duplicated column names in cols.

func ColDescFieldNames 

func ColDescFieldNames(full bool) []string

ColDescFieldNames returns the fields name in result set for desc and show columns.

func GetColDefaultValue 

func GetColDefaultValue(ctx sessionctx.Context, col *model.ColumnInfo) (types.Datum, error)

GetColDefaultValue gets default value of the column.

func GetColOriginDefaultValue 

func GetColOriginDefaultValue(ctx sessionctx.Context, col *model.ColumnInfo) (types.Datum, error)

GetColOriginDefaultValue gets default value of the column from original default value.

func GetZeroValue 

func GetZeroValue(col *model.ColumnInfo) types.Datum

GetZeroValue gets zero value for given column type.

Types

type ColDesc 

type ColDesc struct {
	Field        string
	Type         string
	Collation    string
	Null         string
	Key          string
	DefaultValue interface{}
	Extra        string
	Privileges   string
	Comment      string
}

ColDesc describes column information like MySQL desc and show columns do.

func NewColDesc 

func NewColDesc(col *Column) *ColDesc

NewColDesc returns a new ColDesc for a column.

type Column 

type Column struct {
	*model.ColumnInfo
	// If this column is a generated column, the expression will be stored here.
	GeneratedExpr ast.ExprNode
}

Column provides meta data describing a table column.

func FindCol 

func FindCol(cols []*Column, name string) *Column

FindCol finds column in cols by name.

func FindCols 

func FindCols(cols []*Column, names []string, pkIsHandle bool) ([]*Column, error)

FindCols finds columns in cols by names. If pkIsHandle is false and name is ExtraHandleName, the extra handle column will be added.

func FindOnUpdateCols 

func FindOnUpdateCols(cols []*Column) []*Column

FindOnUpdateCols finds columns which have OnUpdateNow flag.

func ToColumn 

func ToColumn(col *model.ColumnInfo) *Column

ToColumn converts a *model.ColumnInfo to *Column.

func (*Column) CheckNotNull 

func (c *Column) CheckNotNull(data types.Datum) error

CheckNotNull checks if nil value set to a column with NotNull flag is set.

func (*Column) GetTypeDesc 

func (c *Column) GetTypeDesc() string

GetTypeDesc gets the description for column type.

func (*Column) IsPKHandleColumn 

func (c *Column) IsPKHandleColumn(tbInfo *model.TableInfo) bool

IsPKHandleColumn checks if the column is primary key handle column.

func (*Column) String 

func (c *Column) String() string

String implements fmt.Stringer interface.

func (*Column) ToInfo 

func (c *Column) ToInfo() *model.ColumnInfo

ToInfo casts Column to model.ColumnInfo NOTE: DONT modify return value.

type Index 

type Index interface {
	// Meta returns IndexInfo.
	Meta() *model.IndexInfo
	// Create supports insert into statement.
	Create(ctx sessionctx.Context, rm kv.RetrieverMutator, indexedValues []types.Datum, h int64) (int64, error)
	// Delete supports delete from statement.
	Delete(sc *stmtctx.StatementContext, m kv.Mutator, indexedValues []types.Datum, h int64) error
	// Drop supports drop table, drop index statements.
	Drop(rm kv.RetrieverMutator) error
	// Exist supports check index exists or not.
	Exist(sc *stmtctx.StatementContext, rm kv.RetrieverMutator, indexedValues []types.Datum, h int64) (bool, int64, error)
	// GenIndexKey generates an index key.
	GenIndexKey(sc *stmtctx.StatementContext, indexedValues []types.Datum, h int64, buf []byte) (key []byte, distinct bool, err error)
	// Seek supports where clause.
	Seek(sc *stmtctx.StatementContext, r kv.Retriever, indexedValues []types.Datum) (iter IndexIterator, hit bool, err error)
	// SeekFirst supports aggregate min and ascend order by.
	SeekFirst(r kv.Retriever) (iter IndexIterator, err error)
	// FetchValues fetched index column values in a row.
	// Param columns is a reused buffer, if it is not nil, FetchValues will fill the index values in it,
	// and return the buffer, if it is nil, FetchValues will allocate the buffer instead.
	FetchValues(row []types.Datum, columns []types.Datum) ([]types.Datum, error)
}

Index is the interface for index data on KV store.

type IndexIterator 

type IndexIterator interface {
	Next() (k []types.Datum, h int64, err error)
	Close()
}

IndexIterator is the interface for iterator of index data on KV store.

type PartitionedTable 

type PartitionedTable interface {
	Table
	GetPartition(physicalID int64) PhysicalTable
	GetPartitionByRow(sessionctx.Context, []types.Datum) (Table, error)
}

PartitionedTable is a Table, and it has a GetPartition() method. GetPartition() gets the partition from a partition table by a physical table ID,

type PhysicalTable 

type PhysicalTable interface {
	Table
	GetPhysicalID() int64
}

PhysicalTable is an abstraction for two kinds of table representation: partition or non-partitioned table. PhysicalID is a ID that can be used to construct a key ranges, all the data in the key range belongs to the corresponding PhysicalTable. For a non-partitioned table, its PhysicalID equals to its TableID; For a partition of a partitioned table, its PhysicalID is the partition's ID.

type RecordIterFunc 

type RecordIterFunc func(h int64, rec []types.Datum, cols []*Column) (more bool, err error)

RecordIterFunc is used for low-level record iteration.

type Slice 

type Slice []Table

Slice is used for table sorting.

func (Slice) Len 

func (s Slice) Len() int

func (Slice) Less 

func (s Slice) Less(i, j int) bool

func (Slice) Swap 

func (s Slice) Swap(i, j int)

type Table 

type Table interface {
	// IterRecords iterates records in the table and calls fn.
	IterRecords(ctx sessionctx.Context, startKey kv.Key, cols []*Column, fn RecordIterFunc) error

	// RowWithCols returns a row that contains the given cols.
	RowWithCols(ctx sessionctx.Context, h int64, cols []*Column) ([]types.Datum, error)

	// Row returns a row for all columns.
	Row(ctx sessionctx.Context, h int64) ([]types.Datum, error)

	// Cols returns the columns of the table which is used in select.
	Cols() []*Column

	// WritableCols returns columns of the table in writable states.
	// Writable states includes Public, WriteOnly, WriteOnlyReorganization.
	WritableCols() []*Column

	// Indices returns the indices of the table.
	Indices() []Index

	// WritableIndices returns write-only and public indices of the table.
	WritableIndices() []Index

	// DeletableIndices returns delete-only, write-only and public indices of the table.
	DeletableIndices() []Index

	// RecordPrefix returns the record key prefix.
	RecordPrefix() kv.Key

	// IndexPrefix returns the index key prefix.
	IndexPrefix() kv.Key

	// FirstKey returns the first key.
	FirstKey() kv.Key

	// RecordKey returns the key in KV storage for the row.
	RecordKey(h int64) kv.Key

	// AddRecord inserts a row which should contain only public columns
	// skipHandleCheck indicates that recordID in r has been checked as not duplicate already.
	AddRecord(ctx sessionctx.Context, r []types.Datum, skipHandleCheck bool) (recordID int64, err error)

	// UpdateRecord updates a row which should contain only writable columns.
	UpdateRecord(ctx sessionctx.Context, h int64, currData, newData []types.Datum, touched []bool) error

	// RemoveRecord removes a row in the table.
	RemoveRecord(ctx sessionctx.Context, h int64, r []types.Datum) error

	// AllocAutoID allocates an auto_increment ID for a new row.
	AllocAutoID(ctx sessionctx.Context) (int64, error)

	// Allocator returns Allocator.
	Allocator(ctx sessionctx.Context) autoid.Allocator

	// RebaseAutoID rebases the auto_increment ID base.
	// If allocIDs is true, it will allocate some IDs and save to the cache.
	// If allocIDs is false, it will not allocate IDs.
	RebaseAutoID(ctx sessionctx.Context, newBase int64, allocIDs bool) error

	// Meta returns TableInfo.
	Meta() *model.TableInfo

	// Seek returns the handle greater or equal to h.
	Seek(ctx sessionctx.Context, h int64) (handle int64, found bool, err error)

	// Type returns the type of table
	Type() Type
}

Table is used to retrieve and modify rows in table.

type Type 

type Type int16

Type , the type of table, store data in different ways. 

const (
	// NormalTable , store data in tikv, mocktikv and so on.
	NormalTable Type = iota
	// VirtualTable , store no data, just extract data from the memory struct.
	VirtualTable
	// MemoryTable , store data only in local memory.
	MemoryTable
)

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