Hi Ashikaga,
As you can probably see in the ibm_db.c driver code available in gems/ibm_db-0.8.0-mswin32/ext there's nothing i5 specific for handling auto-generated primary keys. The ibm_db driver just simply relies on the DB2 CLI driver (libdb2) for that.
That being said, we probably need some context regarding this question specifically on the i5 platform in order to help. Please feel free to let us know if we can help with other related information.
Thanks,
Alex
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