borland Packages Class Hierarchy dx.dataset Package
java.lang.Object +----com.borland.dx.dataset.AggOperator +----com.borland.dx.dataset.CustomAggOperator
Variables Properties Methods
Implements Serializable, Cloneable
The CustomAggOperator
class is used internally as a place holder for Column
values that are aggregated by using the StorageDataSet.calcAggFieldsListener
event.
To aggregate Column
values with the StorageDataSet.calcAggFieldsListener
event, you must:
aggColumn
in the Column
's AggDescriptor
property to null.
aggOperator
in the Column
's AggDescriptor
property to null.
Column
to maintain the aggregate value. Set its calcType
property to calcType.Aggregate
.
CalcAggFieldsListener
with the aggregate Column
's StorageDataSet
.
For more information on aggregating, see "Aggregating data with calculated fields" in the Database Application Developer's Guide.
public final boolean isUpdatable()This property is used internally by other
com.borland
classes. You should never use this property directly.
public void add(ReadRow row, long internalRow, boolean first)This method is used internally by other
com.borland
classes. You should never use this method directly. This method is a "dummy" add request. The StorageDataSet.calcAggFieldsListener
maintains the aggregate.
public void delete(ReadRow row, long internalRow)This method is used internally by other
com.borland
classes. You should never use this method directly. This method is a "dummy" delete request. The StorageDataSet.calcAggFieldsListener
maintains the aggregate.