org.apache.torque.util.functions
Class Aggregate

java.lang.Object
  org.apache.torque.util.functions.Aggregate

public class Aggregate
extends java.lang.Object

A container for classes that will generate SQL for the SQL99 Standard Aggregate functions. These can be used via the Criteria.addAsColumn method to produce SQL statements that can be called via the BasePeer.doSelect methods.

Note database servers that use non-standard function names can be supported by using the setFunction(String) method.

E.g., older MySQL servers use LEAST instead of MIN. This can be supported by creating a Aggregate.Min instance and then calling the setFunction("LEAST") method.

Version:

$Id

Author:

Greg Monroe

See Also:

SummaryHelper

Nested Class Summary

class	Aggregate.AgregateFunction The base class for all the standard aggregate function classes.
class	Aggregate.Avg SQL99 Standard Average a column function.
class	Aggregate.Count SQL99 Standard Count records function.
class	Aggregate.Max SQL99 Standard maximum value of column function.
class	Aggregate.Min SQL99 Standard Minimum value of column function.
class	Aggregate.Sum SQL99 Standard sum column values function.

Constructor Summary

Aggregate()

Method Summary

Methods inherited from class java.lang.Object

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

Constructor Detail

Aggregate

public Aggregate()