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Additional documentation.

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This commit is contained in:
go-jet 2019-07-18 17:43:11 +02:00
parent d253a35161
commit b10270b502
48 changed files with 892 additions and 699 deletions
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23
expression.go
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@ -4,12 +4,13 @@ import (
"errors"
)
// Common expression interface
// Expression is common interface for all expressions.
// Can be Bool, Int, Float, String, Date, Time, Timez, Timestamp or Timestampz expressions.
type Expression interface {
clause
projection
groupByClause
OrderByClause
orderByClause
// Test expression whether it is a NULL value.
IS_NULL() BoolExpression
@ -25,16 +26,16 @@ type Expression interface {
AS(alias string) projection
// Expression will be used to sort query result in ascending order
ASC() OrderByClause
ASC() orderByClause
// Expression will be used to sort query result in ascending order
DESC() OrderByClause
DESC() orderByClause
}
type expressionInterfaceImpl struct {
parent Expression
}
func (e *expressionInterfaceImpl) from(subQuery ExpressionTable) projection {
func (e *expressionInterfaceImpl) from(subQuery SelectTable) projection {
return e.parent
}
@ -58,11 +59,11 @@ func (e *expressionInterfaceImpl) AS(alias string) projection {
return newAlias(e.parent, alias)
}
func (e *expressionInterfaceImpl) ASC() OrderByClause {
func (e *expressionInterfaceImpl) ASC() orderByClause {
return newOrderByClause(e.parent, true)
}
func (e *expressionInterfaceImpl) DESC() OrderByClause {
func (e *expressionInterfaceImpl) DESC() orderByClause {
return newOrderByClause(e.parent, false)
}
@ -145,13 +146,13 @@ func newPrefixExpression(expression Expression, operator string) prefixOpExpress
func (p *prefixOpExpression) serialize(statement statementType, out *sqlBuilder, options ...serializeOption) error {
if p == nil {
return errors.New("jet: Prefix Expression is nil.")
return errors.New("jet: Prefix Expression is nil")
}
out.writeString(p.operator + " ")
if p.expression == nil {
return errors.New("jet: nil prefix Expression.")
return errors.New("jet: nil prefix Expression")
}
if err := p.expression.serialize(statement, out); err != nil {
return err
@ -177,11 +178,11 @@ func newPostfixOpExpression(expression Expression, operator string) postfixOpExp
func (p *postfixOpExpression) serialize(statement statementType, out *sqlBuilder, options ...serializeOption) error {
if p == nil {
return errors.New("jet: Postifx operator Expression is nil.")
return errors.New("jet: Postifx operator Expression is nil")
}
if p.expression == nil {
return errors.New("jet: nil prefix Expression.")
return errors.New("jet: nil prefix Expression")
}
if err := p.expression.serialize(statement, out); err != nil {
return err