driver

Documentation

Index

• Constants
• Variables
• func BuildSpecialCommentPrefix(featureID featureID) string
• type ParamMarkerExpr
  • func (n *ParamMarkerExpr) Accept(v ast.Visitor) (ast.Node, bool)
  • func (n *ParamMarkerExpr) Format(w io.Writer)
  • func (n *ParamMarkerExpr) Restore(ctx *format.RestoreCtx) error
  • func (n *ParamMarkerExpr) SetOrder(order int)
• type ValueExpr
  • func (n *ValueExpr) Accept(v ast.Visitor) (ast.Node, bool)
  • func (n *ValueExpr) Format(w io.Writer)
  • func (n *ValueExpr) GetDatumString() string
  • func (n *ValueExpr) GetProjectionOffset() int
  • func (n *ValueExpr) Restore(ctx *format.RestoreCtx) error
  • func (n *ValueExpr) SetProjectionOffset(offset int)
  • func (n *ValueExpr) SetValue(res interface{})

Constants

const (
	// FeatureIDAutoRandom is the `auto_random` feature.
	FeatureIDAutoRandom featureID = "auto_rand"
	// FeatureIDAutoIDCache is the `auto_id_cache` feature.
	FeatureIDAutoIDCache featureID = "auto_id_cache"
	// FeatureIDAutoRandomBase is the `auto_random_base` feature.
	FeatureIDAutoRandomBase featureID = "auto_rand_base"
)

const SpecialCommentVersionPrefix = `/*T!`

SpecialCommentVersionPrefix is the prefix of TiDB executable comments.

Variables

var FeatureIDPatterns = map[featureID]*regexp.Regexp{
	FeatureIDAutoRandom:     regexp.MustCompile(`(?i)AUTO_RANDOM\b\s*(\s*\(\s*\d+\s*\)\s*)?`),
	FeatureIDAutoIDCache:    regexp.MustCompile(`(?i)AUTO_ID_CACHE\s*=?\s*\d+\s*`),
	FeatureIDAutoRandomBase: regexp.MustCompile(`(?i)AUTO_RANDOM_BASE\s*=?\s*\d+\s*`),
}

FeatureIDPatterns is used to record special comments patterns.

Functions

func BuildSpecialCommentPrefix

func BuildSpecialCommentPrefix(featureID featureID) string

BuildSpecialCommentPrefix returns the prefix of `featureID` special comment. For some special feature in TiDB, we will refine ddl query with special comment, which may be useful when A: the downstream is directly MySQL instance (treat it as comment for compatibility). B: the downstream is lower version TiDB (ignore the unknown feature comment). C: the downstream is same/higher version TiDB (parse the feature syntax out).

Types

type ParamMarkerExpr

type ParamMarkerExpr struct {
	ValueExpr
	Offset    int
	Order     int
	InExecute bool
}

ParamMarkerExpr expression holds a place for another expression. Used in parsing prepare statement.

func (*ParamMarkerExpr) Accept

func (n *ParamMarkerExpr) Accept(v ast.Visitor) (ast.Node, bool)

Accept implements Node Accept interface.

func (*ParamMarkerExpr) Format

func (n *ParamMarkerExpr) Format(w io.Writer)

Format the ExprNode into a Writer.

func (*ParamMarkerExpr) Restore

func (n *ParamMarkerExpr) Restore(ctx *format.RestoreCtx) error

Restore implements Node interface.

func (*ParamMarkerExpr) SetOrder

func (n *ParamMarkerExpr) SetOrder(order int)

SetOrder implements the ast.ParamMarkerExpr interface.

type ValueExpr

type ValueExpr struct {
	ast.TexprNode
	types.Datum
	// contains filtered or unexported fields
}

ValueExpr is the simple value expression.

func (*ValueExpr) Accept

func (n *ValueExpr) Accept(v ast.Visitor) (ast.Node, bool)

Accept implements Node interface.

func (*ValueExpr) Format

func (n *ValueExpr) Format(w io.Writer)

Format the ExprNode into a Writer.

func (*ValueExpr) GetDatumString

func (n *ValueExpr) GetDatumString() string

GetDatumString implements the ast.ValueExpr interface.

func (*ValueExpr) GetProjectionOffset

func (n *ValueExpr) GetProjectionOffset() int

GetProjectionOffset returns ValueExpr.projectionOffset.

func (*ValueExpr) Restore

func (n *ValueExpr) Restore(ctx *format.RestoreCtx) error

Restore implements Node interface.

func (*ValueExpr) SetProjectionOffset

func (n *ValueExpr) SetProjectionOffset(offset int)

SetProjectionOffset sets ValueExpr.projectionOffset for logical plan builder.

func (*ValueExpr) SetValue

func (n *ValueExpr) SetValue(res interface{})

SetValue implements interface of ast.ValueExpr.