usage of TAggregateField

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1 total messages Started by Emmanuel Sun, 29 May 2005 00:03

#92

Author: Emmanuel
Date: Sun, 29 May 2005 00:03

30 lines
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Dear All,

I have some ClientDataSets

TClientDataSet*ClientDataSetA ;
TClientDataSet*ClientDataSetB ;

TDataSource *DataSourceA :

DataSourceA->DataSet =ClientDataSetA

ClientDataSetB->MasterSource=DataSourceA
ClientDataSetB->MasterField="FieldA"
ClientDataSetB->IndexFieldNames="FieldA;FieldB"

I want to calculate the sum of the current FieldC of ClientDataSetB under
the relationship of ClientDataSetA
but I found that the TAggregateField must be some every record igrone the
MasterSource information
How to I do it?

I cannot use the TDataSetField, because there are so many table relate to
ClientDataSetA;
but TDataSetField can only handle 1 master dataset and 1 detail dataset
without bug
please teach me if you know

thank you

Emmanuel

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