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
，