mysql函数实例

 CREATE FUNCTION hello()
 RETURNS VARCHAR(255)
 BEGIN
 RETURN 'Hello  world,i am mysql';
 END


DROP FUNCTION IF EXISTS formatDate
 CREATE FUNCTION   formatDate(fdate datetime)
 RETURNS VARCHAR(255)
 BEGIN
 DECLARE x VARCHAR(255) DEFAULT '';
 SET x= date_format(fdate,'%Y年%m月%d日%h时%i分%s秒');
 RETURN x;
 END 


SELECT   formatDate(now());

http://www.cnblogs.com/zhangminghui/p/4113160.html