NSString *PgSQLColumnsKeyField ;
key for columns array
NSString *PgSQLNameKeyField ;
key for column's name field (string)
NSString *PgSQLRowsKeyField ;
key for fields array
NSString *PgSQLTypeKeyField ;
key for column's type field (integer)
NSString *PgSQLTypeNameKeyField ;
key for column's type field (integer)
NSString *PgSQLconditionNotificationField ;
NSString *PgSQLconnectionNotificationField ;
NSString *PgSQLuserInfoNotificationField ;
NSString *PostgreSQLNotification ;
NSString *PostgreSQLResultAvailable ;
NSString *PostgreSQLTimeOut ;
(Last Updated 12/27/2002)