} // constructor
/**
* Creates a SelectItem that references another select item in a subquery
*
* @param subQuerySelectItem
* @param subQueryFromItem
* the FromItem that holds the sub-query
*/
public SelectItem(SelectItem subQuerySelectItem, FromItem subQueryFromItem) :
this(null, subQueryFromItem, null, null, null, subQuerySelectItem, null, false)
{
if (subQueryFromItem.getSubQuery() == null)
{
throw new ArgumentException("Only sub-query based FromItems allowed.");
}
if (subQuerySelectItem.getQuery() != null &&
!subQuerySelectItem.getQuery().Equals(subQueryFromItem.getSubQuery()))
{
throw new ArgumentException("The SelectItem must exist in the sub-query");
}
} // constructor
public FilterItem setQuery(Query query)
{
_query = query;
if (_childItems == null)
{
if (_expression == null)
{
if (_selectItem.getQuery() == null)
{
_selectItem.setQuery(_query);
}
if (_operand is SelectItem)
{
SelectItem operand = (SelectItem)_operand;
if (operand.getQuery() == null)
{
operand.setQuery(_query);
}
}
}
}
else
{
foreach (FilterItem item in _childItems)
{
if (item.getQuery() == null)
{
item.setQuery(_query);
}
}
}
return(this);
}
} // groupBy()
public Query groupBy(params GroupByItem[] items)
{
foreach (GroupByItem item in items)
{
SelectItem selectItem = item.getSelectItem();
if (selectItem != null && selectItem.getQuery() == null)
{
selectItem.setQuery(this);
}
}
_groupByClause.addItems(items);
return(this);
} // groupBy()
