来源: MySQL带参数的存储过程小例子 – IT徐胖子的专栏 – 博客频道 – CSDN.NET
存储过程P_GET_CLASS_NAME是根据输入的班级号判断班级名称
存储过程P_INSERT_STUDENT是接收输入的学生信息,最终将信息插入学生表。
- DROP PROCEDURE IF EXISTS `P_GET_CLASS_NAME`;
- CREATE PROCEDURE P_GET_CLASS_NAME(IN ID int,OUT NAME VARCHAR(50))
- BEGIN
- IF(ID = 1) THEN
- SET NAME = ‘一班’;
- END IF;
- IF(ID = 2) THEN
- SET NAME = ‘二班’;
- END IF;
- END;
- DROP PROCEDURE IF EXISTS `P_INSERT_STUDENT`;
- CREATE PROCEDURE P_INSERT_STUDENT(IN ID INT,IN NAME VARCHAR(10),IN CLASSNO INT,IN BIRTH DATETIME)
- BEGIN
- SET @ID = ID;
- SET @NAME = NAME;
- SET @CLASSNO = CLASSNO;
- SET @BIRTH = BIRTH;
- SET @CLASSNAME = NULL;
- CALL P_GET_CLASS_NAME(@CLASSNO,@CLASSNAME);
- SET @insertSQL = CONCAT(‘INSERT INTO TBL_STUDENT VALUES(?,?,?,?)’);
- PREPARE stmtinsert FROM @insertSQL;
- EXECUTE stmtinsert USING @ID,@NAME,@CLASSNAME,@BIRTH;
- DEALLOCATE PREPARE stmtinsert;
- END;
- CALL P_INSERT_STUDENT(1,‘xy’,1,‘2012-10-01 10:20:01’);
在第二个存储过程中
①利用SET声明了参数,调用了第一个存储过程
②在第一个存储过程中的NAME参数是输出参数,所以@CLASSNAME这个参数在调用完第一个过程后就被附值
③最终利用CONCAT拼接SQL语句并传入参数执行SQL语句
CALL P_INSERT_STUDENT(1,’xy’,1,’2012-10-01 10:20:01′);调用存储过程