SQL编程
变量
局部变量 declare
全局变量 @a
set @a = 10; 直接赋值
set @a := 'zhoudian';
select @c := 'abc'; 打印并赋值
select @@version;
@@开头是MySQL已经定义好的一些变量。
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drop procedure if exists sp1;
-
delimiter // -- 修改语句界定符，这样就允许在程序体中使用;
-
create procedure sp1()
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begin
-
-- 在declare之前不能有非declare语句
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declare a int; -- declare声明局部变量
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declare b, c , d float default 3.3;
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set a = 10; -- 没有赋值时默认为null
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set b =1.23, c=8.9;
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select a, b, c, @b;
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end//
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delimiter ;
----------------------------------------------
show procedure status\G;
show procedure status like 'sp1' \G;
---------------------------------------------
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drop procedure if exists sp1;
-
delimiter //
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create procedure sp1()
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begin
-
declare a int;
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declare b dec(5,2) default 10;
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declare c varchar(32) charset utf8;
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set a = 10;
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set b = 314.12;
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set c = '中国';
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select a, b, c;
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end //
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delimiter ;
-----------------------------------------------
存储过程(数据库中的)，执行速度快
MySQL中的存储过程没有返回值，但是可以通过out参数将值传出
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drop procedure if exists sp1;
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delimiter //
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create procedure sp1(a date , b varchar(20))
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begin
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select a, b;
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end //
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delimiter ;
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drop procedure if exists sp1;
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delimiter //
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create procedure sp1(sid int, sname varchar(32))
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begin
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create table if not exists stu
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(
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stuID int,
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stuName varchar(32)
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)engine=innodb charset=utf8;
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insert into stu values(sid,sname);
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end //
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delimiter ;
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-- 使用out传出值,,,,,inout传入传出
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drop procedure if exists sp1;
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delimiter //
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create procedure sp1(out c int)
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begin
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select count(1) into c from stu;
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end //
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delimiter ;
-
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call sp1(@c);
-----------------------------------------------------------------
select * from stu;
select found_rows(); -- 上一条语句一共查出了多少条记录
---------------------------------------------------------------------------------
使用php连接数据库
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create table dept
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(
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deptID int,
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deptName varchar(32)
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)engine=innodb charset=utf8;
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drop procedure if exists sp1;
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delimiter //
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create procedure sp1(a int, b varchar(32))
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begin
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insert into dept values(a, b);
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end //
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delimiter ;
html页面
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<html>
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<body>
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<form name="frm" action="my.php" method="post">
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deptID:<input type="text" name="deptID" /><br />
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deptName:<input type="text" name="deptName" /><br />
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<input type="submit" value="submit">
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</form>
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</body>
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</html>
php页面
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<?php
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$deptID = $_POST['deptID'];
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$deptName = $_POST['deptName'];
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mysql_connect('localhost:/var/run/mysqld/mysql57.sock','root','');
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mysql_select_db('ds');
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mysql_query('set names utf8');
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#$sql = "insert into dept values($deptID,'$deptName')";
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#mysql_query($sql);
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mysql_query("call sp1($deptID,'$deptName')");
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?>
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