org.proteios.core.query
Class Selects

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

public class Selects
extends Object

A factory class to create select expressions.

Version:

2.0

Author:

Nicklas

Last modified

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

Field Summary

static Pattern

ALIAS_REGEXP An alias can only contain the characters a-z, A-Z or 0-9.

Constructor Summary

Selects()

Method Summary

static Select

expression(Expression e1, String alias) Create a selection from an expression, optionally giving it an alias.

Methods inherited from class java.lang.Object

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

Field Detail

ALIAS_REGEXP

public static final Pattern ALIAS_REGEXP

An alias can only contain the characters a-z, A-Z or 0-9.

Constructor Detail

Selects

public Selects()

Method Detail

expression

public static final Select expression(Expression e1,
                                      String alias)
                               throws InvalidDataException

Create a selection from an expression, optionally giving it an alias. The alias can be used when getting the result to find the column index. See SqlResultIterator.getIndex(String).

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

TODO - more example code

Parameters:

e1 - The expression to select

alias - The alias to give the expression

Returns:

A selection query element

Throws:

InvalidDataException - If the expression is null or if the alias contains invalid characters