predicates

Documentation

Index

• func WriteAll(sw io.StringWriter, predicates []Predicate) error
• type Between
  • func (f Between) LogicOp() Logic
  • func (f Between) WriteTo(writer io.StringWriter) error
• type EQ
  • func (f EQ) LogicOp() Logic
  • func (f EQ) WriteTo(writer io.StringWriter) error
• type GT
  • func (f GT) LogicOp() Logic
  • func (f GT) WriteTo(writer io.StringWriter) error
• type GTE
  • func (f GTE) LogicOp() Logic
  • func (f GTE) WriteTo(writer io.StringWriter) error
• type In
  • func (f In) LogicOp() Logic
  • func (f In) WriteTo(writer io.StringWriter) error
• type IsNull
  • func (f IsNull) LogicOp() Logic
  • func (f IsNull) WriteTo(writer io.StringWriter) error
• type LT
  • func (f LT) LogicOp() Logic
  • func (f LT) WriteTo(writer io.StringWriter) error
• type LTE
  • func (f LTE) LogicOp() Logic
  • func (f LTE) WriteTo(writer io.StringWriter) error
• type Like
  • func (f Like) LogicOp() Logic
  • func (f Like) WriteTo(writer io.StringWriter) error
• type Logic
• type NE
  • func (f NE) LogicOp() Logic
  • func (f NE) WriteTo(writer io.StringWriter) error
• type Not
  • func (f Not) LogicOp() Logic
  • func (f Not) WriteTo(writer io.StringWriter) error
• type Predicate
• type Wrap
  • func (f Wrap) LogicOp() Logic
  • func (f Wrap) WriteTo(sw io.StringWriter) error

Functions

func WriteAll

func WriteAll(sw io.StringWriter, predicates []Predicate) error

WriteAll writes predicates to a string writer. It will ignore the logic operator of the first predicate.

Types

type Between

type Between struct {
	Col   expressions.Expression
	Low   expressions.Expression
	High  expressions.Expression
	Logic Logic
}

func (Between) LogicOp

func (f Between) LogicOp() Logic

func (Between) WriteTo

func (f Between) WriteTo(writer io.StringWriter) error

type EQ

type EQ struct {
	Col   expressions.Expression
	Expr  expressions.Expression
	Logic Logic
}

EQ is an equal condition.

func (EQ) LogicOp

func (f EQ) LogicOp() Logic

func (EQ) WriteTo

func (f EQ) WriteTo(writer io.StringWriter) error

type GT

type GT struct {
	Col   expressions.Expression
	Expr  expressions.Expression
	Logic Logic
}

GT is a greater than condition.

func (GT) LogicOp

func (f GT) LogicOp() Logic

func (GT) WriteTo

func (f GT) WriteTo(writer io.StringWriter) error

type GTE

type GTE struct {
	Col   expressions.Expression
	Expr  expressions.Expression
	Logic Logic
}

GTE is a greater than or equal to condition.

func (GTE) LogicOp

func (f GTE) LogicOp() Logic

func (GTE) WriteTo

func (f GTE) WriteTo(writer io.StringWriter) error

type In

type In struct {
	Col         expressions.Expression
	Expressions []expressions.Expression
	Logic       Logic
}

In is an IN condition.

func (In) LogicOp

func (f In) LogicOp() Logic

func (In) WriteTo

func (f In) WriteTo(writer io.StringWriter) error

type IsNull

type IsNull struct {
	Col   expressions.Expression
	Logic Logic
}

IsNull is a IS NULL condition.

func (IsNull) LogicOp

func (f IsNull) LogicOp() Logic

func (IsNull) WriteTo

func (f IsNull) WriteTo(writer io.StringWriter) error

type LT

type LT struct {
	Col   expressions.Expression
	Expr  expressions.Expression
	Logic Logic
}

LT is a less than condition.

func (LT) LogicOp

func (f LT) LogicOp() Logic

func (LT) WriteTo

func (f LT) WriteTo(writer io.StringWriter) error

type LTE

type LTE struct {
	Col   expressions.Expression
	Expr  expressions.Expression
	Logic Logic
}

LTE is a less than or equal to condition.

func (LTE) LogicOp

func (f LTE) LogicOp() Logic

func (LTE) WriteTo

func (f LTE) WriteTo(writer io.StringWriter) error

type Like

type Like struct {
	Col   expressions.Expression
	Expr  expressions.Expression
	Logic Logic
}

Like is a LIKE condition.

func (Like) LogicOp

func (f Like) LogicOp() Logic

func (Like) WriteTo

func (f Like) WriteTo(writer io.StringWriter) error

type Logic

type Logic int

Logic is a logic operator.

const (
	AND Logic = iota // LogicAnd is the AND operator.
	OR               // LogicOr is the OR operator.
)

type NE

type NE struct {
	Col   expressions.Expression
	Expr  expressions.Expression
	Logic Logic
}

NE is a not equal condition.

func (NE) LogicOp

func (f NE) LogicOp() Logic

func (NE) WriteTo

func (f NE) WriteTo(writer io.StringWriter) error

type Not

type Not struct {
	Predicate Predicate
}

Not is a NOT condition.

func (Not) LogicOp

func (f Not) LogicOp() Logic

func (Not) WriteTo

func (f Not) WriteTo(writer io.StringWriter) error

type Predicate

type Predicate interface {
	LogicOp() Logic // LogicOp returns the logic operator: AND or OR.
	WriteTo(writer io.StringWriter) error
}

Predicates are conditions that can be evaluated to SQL three-valued logic (3VL) (true/false/unknown)

type Wrap

type Wrap struct {
	Predicates []Predicate
	Logic      Logic
}

Wrap wraps a group of predicates in parenthesis.

func (Wrap) LogicOp

func (f Wrap) LogicOp() Logic

func (Wrap) WriteTo

func (f Wrap) WriteTo(sw io.StringWriter) error

Write writes the group to the given writer.