If generated keys are requested on a table that has no IDENTITY column, the JDBC driver will return a null result set.Īs an example, create the following table in the sample database: CREATE TABLE TestTable The result set that is returned by getGeneratedKeys method of the SQLServerStatement class will have only one column, with the returned column name of GENERATED_KEYS. SQL Server allows only a single IDENTITY column per table. The main value of this feature is to provide a way to make IDENTITY values available to an application that is updating a database table without a requiring a query and a second round trip to the server.īecause SQL Server doesn't support pseudo columns for identifiers, updates that have to use the autogenerated key feature must operate against a table that contains an IDENTITY column.
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