The CUBRID connection. If the connection identifier is not specified, the last link opend by cubrid_connect is assumed.
Request Identifier, could be returned from either cubrid_prepare or cubrid_execute. If the request identifier is not specified, the last identifier requested by cubrid_prepare or cubrid_execute is assumed.
Number of rows affected by the SQL statement, when process is successful.
-1, when SQL statement is not INSERT, DELETE or UPDATE.
false, when the request identifier is not specified, and there is no last request.