2.10.0: 2009-02-24

net.sf.basedb.core.query
Class SumExpression

java.lang.Object
  extended by net.sf.basedb.core.query.SumExpression
All Implemented Interfaces:
Expression, QueryElement

public class SumExpression
extends Object
implements Expression

Calculates the sum of an expression: SUM(e)

Version:
2.0
Author:
Nicklas
See Also:
Aggregations.mean(Expression)
Last modified
$Date: 2008-09-11 22:09:17 +0200 (Thu, 11 Sep 2008) $

Field Summary
private  Expression e
           
 
Constructor Summary
SumExpression(Expression e)
           
 
Method Summary
 Collection<? extends QueryElement> getChildren()
          Get the children of this query element or null if it has no children.
 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
 

Field Detail

e

private final Expression e
Constructor Detail

SumExpression

SumExpression(Expression e)
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

getChildren

public Collection<? extends QueryElement> getChildren()
Description copied from interface: QueryElement
Get the children of this query element or null if it has no children. For example the AddExpression has two children, the expression beeing added.

Specified by:
getChildren in interface QueryElement
Returns:
The expression to sum

toString

public String toString()
Overrides:
toString in class Object

2.10.0: 2009-02-24