separate dataset instances using datamodules in delphi

Question

I am using Delphi6 and have a data module with an ADO DataSet which is used by two forms, formA and FormB. Each form has a Datas

Answer 1

Probably you need a separate instance from the datamodule for each form.

If you really want to use the same datamodule instance form both forms, then you have to open and close the dataset from the datamodule, adding some reference counting mechanism.

Tipically you do that by having a procedure for opening the dataset and one for closing it in the datamodule and an integer to count the open and close calls. The procedure which opens the dataset actually opens it only at the first call, at any subsequent call just incremets the counter. The closer procedure decrements the counter at each call, and closes the database when the counter value drops back to 0.