How can I find if a DataSet is the master in a master/detail relationship in Delphi?
-
28-06-2021 - |
質問
I want to create a "Duplicate Record" action which when invoked, duplicates current record in any TDataSet
descendant. How can I find out if the dataset is the master dataset of a master/detail relationship? With TClientDataSet
it's rather easy, but I need this action to be used with all descendants of TDataSet
.
解決
You should call TDataSet
.GetDetailDataSets
method. If the list is not empty, then this dataset is the master dataset for the datasets in the list. For example:
var
oDetails: TList;
lIsMaster: Boolean;
...
oDetails := TList.Create;
try
myDataSet.GetDetailDataSets(oDetails);
lIsMaster := oDetails.Count > 0;
finally
oDetails.Free;
end;
所属していません StackOverflow