77 lines
953 B
Markdown
77 lines
953 B
Markdown
# 存储过程
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## 一、创建存储过程（create procedure）
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### 1.创建无参的存储过程
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```mysql
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delimiter //
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create procedure proc()
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begin
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select from fruits;
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end //
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```
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```mysql
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修改数据库命令结束标志
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delimiter //
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end //
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```
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### 2.带输出参数的存储过程
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```mysql
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delimiter $$
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create procedure proc1(out num int)
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begin
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select count(*)into num from fruits;
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end $$
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```
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### 3.创建带输入输出参数的存储过程
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```mysql
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delimiter $$
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create procedure proc2(in sid int,out n int)
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begin
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select count(*)into n from fruits where s id=sid;
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end$$
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```
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## 二、调用存储过程（call）
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### 1.调用无参的存储过程
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```mysql
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call proc();
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```
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### 2.带输出参数的存储过程
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```mysql
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call proc(@num);$$
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select @num; $$
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```
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### 3.调用带输入输出参数的存储过程
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```mysql
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call proc2(101,@n);$$
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select @n;$$
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```
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## 三、删除存储过程
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```mysql
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drop procedure 存储名
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```
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