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Add wiki Expressions page.

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go-jet 2019-06-27 19:55:21 +02:00
parent 3516d2861c
commit 6a6ee0561d
17 changed files with 399 additions and 109 deletions
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30
operators.go
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@ -11,48 +11,48 @@ func NOT(expr BoolExpression) BoolExpression {
//----------- Comparison operators ---------------//
func EXISTS(subQuery SelectStatement) BoolExpression {
return newPrefixBoolExpression(subQuery, "EXISTS")
}
// Returns a representation of "a=b"
func EQ(lhs, rhs Expression) BoolExpression {
func eq(lhs, rhs Expression) BoolExpression {
return newBinaryBoolExpression(lhs, rhs, "=")
}
// Returns a representation of "a!=b"
func NOT_EQ(lhs, rhs Expression) BoolExpression {
func notEq(lhs, rhs Expression) BoolExpression {
return newBinaryBoolExpression(lhs, rhs, "!=")
}
func IS_DISTINCT_FROM(lhs, rhs Expression) BoolExpression {
func isDistinctFrom(lhs, rhs Expression) BoolExpression {
return newBinaryBoolExpression(lhs, rhs, "IS DISTINCT FROM")
}
func IS_NOT_DISTINCT_FROM(lhs, rhs Expression) BoolExpression {
func isNotDistinctFrom(lhs, rhs Expression) BoolExpression {
return newBinaryBoolExpression(lhs, rhs, "IS NOT DISTINCT FROM")
}
// Returns a representation of "a<b"
func LT(lhs Expression, rhs Expression) BoolExpression {
func lt(lhs Expression, rhs Expression) BoolExpression {
return newBinaryBoolExpression(lhs, rhs, "<")
}
// Returns a representation of "a<=b"
func LT_EQ(lhs, rhs Expression) BoolExpression {
func ltEq(lhs, rhs Expression) BoolExpression {
return newBinaryBoolExpression(lhs, rhs, "<=")
}
// Returns a representation of "a>b"
func GT(lhs, rhs Expression) BoolExpression {
func gt(lhs, rhs Expression) BoolExpression {
return newBinaryBoolExpression(lhs, rhs, ">")
}
// Returns a representation of "a>=b"
func GT_EQ(lhs, rhs Expression) BoolExpression {
func gtEq(lhs, rhs Expression) BoolExpression {
return newBinaryBoolExpression(lhs, rhs, ">=")
}
func EXISTS(subQuery SelectStatement) BoolExpression {
return newPrefixBoolExpression(subQuery, "EXISTS")
}
// --------------- CASE operator -------------------//
type CaseOperatorExpression interface {
@ -125,14 +125,14 @@ func (c *caseOperatorImpl) serialize(statement statementType, out *queryData, op
for i, when := range c.when {
out.writeString("WHEN")
err := when.serialize(statement, out, NO_WRAP)
err := when.serialize(statement, out, noWrap)
if err != nil {
return err
}
out.writeString("THEN")
err = c.then[i].serialize(statement, out, NO_WRAP)
err = c.then[i].serialize(statement, out, noWrap)
if err != nil {
return err
@ -141,7 +141,7 @@ func (c *caseOperatorImpl) serialize(statement statementType, out *queryData, op
if c.els != nil {
out.writeString("ELSE")
err := c.els.serialize(statement, out, NO_WRAP)
err := c.els.serialize(statement, out, noWrap)
if err != nil {
return err