isql.expression
Class ColumnExpressionByGroup

java.lang.Object
  isql.expression.ColumnExpressionByGroup

All Implemented Interfaces:

ISimpleExpression, IWhereExpression, IExpression

public class ColumnExpressionByGroup
extends java.lang.Object
implements ISimpleExpression, IWhereExpression

A simple table-column expression. In this case the SQL query contains a group by claues, so that this expression is repeated for each row in a group. In other words there is only one value of the expression for the whole group

Author:

SHZ Nov 5, 2007

Constructor Summary

ColumnExpressionByGroup(ColumnKey key, Groups groups)

Method Summary

java.util.Set<ColumnKey>	getInvolvedColumns() Returns the table columns named in the expression
ITypedValue	getResult() Get the result of the expression (can be a constant or an array)
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ColumnExpressionByGroup

public ColumnExpressionByGroup(ColumnKey key,
                               Groups groups)

Method Detail

getResult

public ITypedValue getResult()
                      throws ISQLException

Description copied from interface: IExpression

Get the result of the expression (can be a constant or an array)

Specified by:

getResult in interface IExpression

Returns:

the result

Throws:

ISQLException

getInvolvedColumns

public java.util.Set<ColumnKey> getInvolvedColumns()

Description copied from interface: IExpression

Returns the table columns named in the expression

Specified by:

getInvolvedColumns in interface IExpression

Returns:

the identifiers of the columns

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object