I have database connector for read. But it requires input parameters (to set "where" conditions in the SQL statement) and will output some fields. How to set up the "fields" or "parameters" in the database operation (database profile) for the connector? Do I specify all of the input and output in the "fields"? I have a map before the database connector. In the map, the destination "parameters" cannot map to anything (cannot connect to any source fields).