mysql——使用——函数——示例

table employee ( num int(50), d_id int(50), name varchar(50), age int(50), sex varchar(50), homeadd varchar(50) ); insert into employee values(1,1001,‘zhangsan‘,26,‘nan‘,‘beijing‘); insert into employee values(2,1001,‘lisi‘,24,‘nv‘,‘hunan‘); insert into employee values(3,1002,‘wangwu‘,25,‘nan‘,‘jiangsu‘); insert into employee values(4,1004,‘aric‘,15,‘nan‘,‘yingguo‘); select * from employee; create table department ( d_id int(50), d_name varchar(50), functione varchar(50), address varchar(50) ); insert into department values(1001,‘keyanbu‘,‘yanfachanpin‘,‘3lou5hao‘); insert into department values(1002,‘shengchanbu‘,‘shengchanchanp‘,‘5louyiceng‘); insert into department values(1003,‘xiaoshoubu‘,‘cehuaxiaoshou‘,‘1louxiaoshoudating‘); select * from employee; select * from department;

 

 

 

定义一个存储函数：

delimiter &&

create function name_from_employee ( emp_id INT )

returns varchar(20)

begin

     return ( select name from employee where num = emp_id );

end &&

delimiter;

 

 

 

 

 

查看此存储函数的状态：

show function status like ‘name_from_employee‘;

 

 

 

 

 

查看此函数的定义：

show create function name_from_employee;

 

 

 

 

调用此函数：

select name_from_employee(3);

 

 

 

 

 

删除此函数：

drop function name_from_employee;

mysql——使用——函数——示例

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