NSString *PgSQLColumnsKeyField ;
key for columns array
NSString *PgSQLNameKeyField ;
NSString *PgSQLRowsKeyField ;
NSString *PgSQLTypeKeyField ;
NSString *PgSQLTypeNameKeyField ;
NSString *PgSQLconditionNotificationField ;
NSString *PgSQLconnectionNotificationField ;
NSString *PgSQLuserInfoNotificationField ;
NSString *PostgreSQLNotification ;
NSString *PostgreSQLResultAvailable ;
(Last Updated 12/27/2002)