MySQL 5.0存储过程的经验总结
以下的文章主要描述的是MySQL 5.0存储过程的经验总结,其中包括MySQL数据库存储过程的正确创建,删除以及调用与其他常用命令的描述,以下的文章就是对MySQL 5.0存储过程的经验总结的具体描述。 MySQL 5.0存储过程学习总结: 一.创建存储过程 1.基本语法: cr
以下的文章主要描述的是MySQL 5.0存储过程的经验总结,其中包括MySQL数据库存储过程的正确创建,删除以及调用与其他常用命令的描述,以下的文章就是对MySQL 5.0存储过程的经验总结的具体描述。
MySQL 5.0存储过程学习总结:
一.创建存储过程
1.基本语法:
create procedure sp_name()
begin
………
end
2.参数传递
二.调用存储过程
1.基本语法:call sp_name()
注意:存储过程名称后面必须加括号,哪怕该存储过程没有参数传递
三.删除存储过程
1.基本语法:
drop procedure sp_name//
2.注意事项
(1)MySQL 5.0存储过程中不能在一个存储过程中删除另一个存储过程,只能调用另一个存储过程
四.区块,条件,循环
1.区块定义,常用
begin
……
end;
也可以给区块起别名,如:
lable:begin
………..
end lable;
可以用leave lable;跳出区块,执行区块以后的代码
2.条件语句
if 条件 then
statement
else
statement
end if;
3.循环语句
(1).while循环
[label:] WHILE expression DO
statements
END WHILE [label] ;
(2).loop循环
[label:] LOOP
statements
END LOOP [label];
(3).repeat until循环
<ol class="dp-xml"> <li class="alt"><span><span>[label:] REPEAT </span></span></li> <li><span>statements </span></li> <li class="alt"><span>UNTIL expression </span></li> <li><span>END REPEAT [label] ; </span></li> </ol>
五.其他常用命令
1.show procedure status
MySQL 5.0存储过程中显示数据库中所有存储的存储过程基本信息,包括所属数据库,存储过程名称,创建时间等
2.show create procedure sp_name
显示某一个存储过程的详细信息
MySQL存储过程中要用到的运算符
MySQL存储过程学习总结-操作符
算术运算符
+ 加 SET var1=2+2; 4
- 减 SET var2=3-2; 1
* 乘 SET var3=3*2; 6
/ 除 SET var4=10/3; 3.3333
DIV 整除 SET var5=10 DIV 3; 3
% 取模 SET var6=10%3 ; 1
比较运算符
> 大于 1>2 False
>= 大于等于 3>=2 True
BETWEEN 在两值之间 5 BETWEEN 1 AND 10 True
NOT BETWEEN 不在两值之间 5 NOT BETWEEN 1 AND 10 False
IN 在集合中 5 IN (1,2,3,4) False
NOT IN 不在集合中 5 NOT IN (1,2,3,4) True
= 等于 2=3 False
, != 不等于 23 False
严格比较两个NULL值是否相等 NULLNULL True
LIKE 简单模式匹配 “Guy Harrison” LIKE “Guy%” True
REGEXP 正则式匹配 “Guy Harrison” REGEXP “[Gg]reg” False
IS NULL 为空 0 IS NULL False
IS NOT NULL 不为空 0 IS NOT NULL True
逻辑运算符
与(AND)
<ol class="dp-xml"> <li class="alt"><span><span>AND TRUE FALSE NULL </span></span></li> <li><span>TRUE TRUE FALSE NULL </span></li> <li class="alt"><span>FALSE FALSE FALSE NULL </span></li> <li><span>NULL NULL NULL NULL </span></li> </ol>
或(OR)
<ol class="dp-xml"> <li class="alt"><span><span>OR TRUE FALSE NULL </span></span></li> <li><span>TRUE TRUE TRUE TRUE </span></li> <li class="alt"><span>FALSE TRUE FALSE NULL </span></li> <li><span>NULL TRUE NULL NULL </span></li> </ol>
异或(XOR)
<ol class="dp-xml"> <li class="alt"><span><span>XOR TRUE FALSE NULL </span></span></li> <li><span>TRUE FALSE TRUE NULL </span></li> <li class="alt"><span>FALSE TRUE FALSE NULL </span></li> <li><span>NULL NULL NULL NULL </span></li> </ol>
位运算符
| 位或
& 位与
>> 右移位
~ 位非(单目运算,按位取反)
上述的相关内容就是对MySQL 5.0存储过程学习总结的描述,希望会给你带来一些帮助在此方面。

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