Jet\DataModel_Query_Select_Item_Expression

It is a class representing an expression within the SELECT part of the query - for example, calling a SQL function.It is a subentity of the Jet\DataModel_Query_Select class and also a subentity of the Jet\DataModel_Query_Select_Item class.

Overview of methods

Method	Meaning of
public __construct( string $expression, DataModel_Definition_Property[] $properties=[] )	Parameters: $expression Expression (e.g. SQL function call). $properties Possible definitions of the properties used in the expression.
public setProperties( DataModel_Definition_Property[] $properties ) : void	Sets the list of properties used in the expression.
public getProperties( ) : DataModel_Definition_Property[]	Returns the definitions of any properties used.
public getExpression( ) : string	It returns the expression in its raw form.
public toString( callable $property_name_to_backend_column_name_callback=null ) : string	Converts the expression to a string, ideally using a backend that converts any property names used into the correct format (relevant to the database type).