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MySQL带参数的存储过程小例子

WBOY
WBOYOriginal
2016-06-07 17:24:13906browse

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

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,'徐越',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,'徐越',1,'2012-10-01 10:20:01');调用存储过程

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