org.proteios.core.query
Class ExpressionSelect

java.lang.Object
  org.proteios.core.query.ExpressionSelect

All Implemented Interfaces:

QueryElement, Select

public class ExpressionSelect
extends Object
implements Select

A selection query element that selects an expression, optionally giving it an alias.

SELECT <expression> AS <alias>
FROM ...

Version:

2.0

Author:

Nicklas

See Also:

Selects.expression(Expression, String)

Last modified

$Date: 2009-04-09 08:48:11 +0200 (Thu, 09 Apr 2009) $

Method Summary

String	getAlias() Get the alias of the selected expression.
Expression	getExpression() Get the expression object representing the selected expression.
String	toQl(Query query, DbControl dc) Create a query language string of the query element.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

toQl

public String toQl(Query query,
                   DbControl dc)
            throws BaseException

Description copied from interface: QueryElement

Create a query language string of the query element. Use the Query.getQueryType() method to find out which query language is wanted in case the element requires different syntax for different languages.

Specified by:

toQl in interface QueryElement

Parameters:

query - The query that is about to be executed

dc - The DbControl object used to execute the query

Throws:

BaseException - If there is any other error

getAlias

public String getAlias()

Description copied from interface: Select

Get the alias of the selected expression.

Specified by:

getAlias in interface Select

Returns:

The alias, or null if no alias has been specified

getExpression

public Expression getExpression()

Description copied from interface: Select

Get the expression object representing the selected expression.

Specified by:

getExpression in interface Select

Returns:

An expression object

toString

public String toString()

Overrides:

toString in class Object