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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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32
expression.go
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@ -5,38 +5,58 @@ import (
"fmt"
)
// An Expression
// Common expression interface
type Expression interface {
clause
projection
groupByClause
OrderByClause
// Test expression whether it is a NULL value.
IS_NULL() BoolExpression
// Test expression whether it is a non-NULL value.
IS_NOT_NULL() BoolExpression
// Check if this expressions matches any in expressions list
IN(expressions ...Expression) BoolExpression
// Check if this expressions is different of all expressions in expressions list
NOT_IN(expressions ...Expression) BoolExpression
// The temporary alias name to assign to the expression
AS(alias string) projection
// Expression will be used to sort query result in ascending order
ASC() OrderByClause
// Expression will be used to sort query result in ascending order
DESC() OrderByClause
// casts
// Cast expression to dbType
TO(dbType string) Expression
// Cast expression to bool type
TO_BOOL() BoolExpression
// Cast expression to smallint type
TO_SMALLINT() IntegerExpression
// Cast expression to integer type
TO_INTEGER() IntegerExpression
// Cast expression to bigint type
TO_BIGINT() IntegerExpression
// Cast expression to numeric type, using precision and optionally scale
TO_NUMERIC(precision int, scale ...int) FloatExpression
// Cast expression to real type
TO_REAL() FloatExpression
// Cast expression to double precision type
TO_DOUBLE() FloatExpression
// Cast expression to text type
TO_TEXT() StringExpression
// Cast expression to date type
TO_DATE() DateExpression
// Cast expression to time type
TO_TIME() TimeExpression
// Cast expression to time with time timezone type
TO_TIMEZ() TimezExpression
// Cast expression to timestamp type
TO_TIMESTAMP() TimestampExpression
// Cast expression to timestamp with timezone type
TO_TIMESTAMPZ() TimestampzExpression
}
@ -139,15 +159,15 @@ func (e *expressionInterfaceImpl) TO_TIMESTAMPZ() TimestampzExpression {
}
func (e *expressionInterfaceImpl) serializeForGroupBy(statement statementType, out *queryData) error {
return e.parent.serialize(statement, out, NO_WRAP)
return e.parent.serialize(statement, out, noWrap)
}
func (e *expressionInterfaceImpl) serializeForProjection(statement statementType, out *queryData) error {
return e.parent.serialize(statement, out, NO_WRAP)
return e.parent.serialize(statement, out, noWrap)
}
func (e *expressionInterfaceImpl) serializeForOrderBy(statement statementType, out *queryData) error {
return e.parent.serialize(statement, out, NO_WRAP)
return e.parent.serialize(statement, out, noWrap)
}
// Representation of binary operations (e.g. comparisons, arithmetic)
@ -177,7 +197,7 @@ func (c *binaryOpExpression) serialize(statement statementType, out *queryData,
return errors.New("nil rhs")
}
wrap := !contains(options, NO_WRAP)
wrap := !contains(options, noWrap)
if wrap {
out.writeString("(")