Description
int 
fbsql_insert_id ( [resource link_identifier])
     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
      fbsql_insert_id() always contains the most
      recently generated DEFAULT UNIQUE value, and is not reset
      between queries.