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We use Delphi 7 + Oracle 10g + dbExpress driver for Oracle
(License Number : CRDBO-01347) , we find that can't use ClientDataset.ApplyUpdate() to Insert/Update Table,the table will change nothing ; however, the "Insert into..." and "Update tablename...." SQL Script can do it well, we can't find what the prblem is, please help us.

Try to set the following properties of TSQLQuery:
NoMetadata := False;
GetMetadata := True;

It solved, and many thanks.