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----用于保存主键
CREATE TABLE `c_guid` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) NOT NULL DEFAULT '',
  `guid` int(11) NOT NULL DEFAULT '1',
  `desc` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`Id`),
  UNIQUE KEY `name` (`name`)
) ENGINE=MyISAM AUTO_INCREMENT=52 DEFAULT CHARSET=utf8;


----如果存在此key，则返回下一个id(既id+1)。否则，创建一条新记录，写入新id为1并返回此id.
CREATE PROCEDURE `nextGUID`(IN p_name varchar(50))
BEGIN    
     insert into c_guid (name,guid) values(p_name,1) ON DUPLICATE KEY UPDATE guid=guid+1;    
     select guid from c_guid where name=p_name;          
END;

call nextGuid('user_pk');