fbsql_insert_id() returns the ID
generated for an column defined as DEFAULT UNIQUE by the
previous INSERT query using the given
link_identifier. If
link_identifier isn't specified, the last opened
link is assumed.
fbsql_insert_id() returns 0 if
the previous query does not generate an DEFAULT UNIQUE value.
If you need to save the value for later, be sure to call
fbsql_insert_id() immediately after the query that generates
the value.
注: The value of the FrontBase SQL function LAST_INSERT_ID() always contains the most recently generated DEFAULT UNIQUE value, and is not reset between queries.