ps_is_account_enabled.sql

/* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */

DROP FUNCTION IF EXISTS ps_is_account_enabled;

DELIMITER $$

CREATE DEFINER=CURRENT_USER FUNCTION ps_is_account_enabled (
        in_host VARCHAR(60), 
        in_user VARCHAR(16)
    ) 
    RETURNS ENUM('YES', 'NO', 'PARTIAL')
    COMMENT '
             Description
             -----------

             Determines whether instrumentation of an account is enabled 
             within Performance Schema.

             Parameters
             -----------

             in_host VARCHAR(60): 
               The hostname of the account to check.
             in_user (VARCHAR(16)):
               The username of the account to check.

             Returns
             -----------

             ENUM(\'YES\', \'NO\', \'PARTIAL\')

             Example
             -----------

             mysql> SELECT sys.ps_is_account_enabled(\'localhost\', \'root\');
             +------------------------------------------------+
             | sys.ps_is_account_enabled(\'localhost\', \'root\') |
             +------------------------------------------------+
             | YES                                            |
             +------------------------------------------------+
             1 row in set (0.01 sec)
            '
    SQL SECURITY INVOKER
    DETERMINISTIC 
    READS SQL DATA 
BEGIN
    RETURN IF(EXISTS(SELECT 1
                       FROM performance_schema.setup_actors
                      WHERE (`HOST` = '%' OR in_host LIKE `HOST`)
                        AND (`USER` = '%' OR `USER` = in_user)
                    ),
              'YES', 'NO'
           );
END $$

DELIMITER ;