MySQL 存储过程实例_MySQL
1. 例子1
DELIMITER //
DROP PROCEDURE IF EXISTS loginandreg //
CREATE PROCEDURE loginandreg(
OUT userId BIGINT,
IN user_Pwd VARCHAR(32),
IN user_MobileCode VARCHAR(16),
IN user_RegIP VARCHAR(16)
)
BEGIN
DECLARE cnt BIGINT DEFAULT 0;
DECLARE cnt2 BIGINT DEFAULT 0;
DECLARE outid BIGINT DEFAULT -1;
SELECT COUNT(*) INTO cnt FROM Users u WHERE u.user_MobileCode=user_MobileCode;
IF cnt > 0 THEN
SELECT COUNT(*) INTO cnt2 FROM Users u WHERE u.user_MobileCode=user_MobileCode AND u.user_Pwd=user_Pwd;
IF cnt2 > 0 THEN
SELECT u.userId INTO outid FROM Users u
WHERE u.user_MobileCode=user_MobileCode AND u.user_Pwd=user_Pwd LIMIT 1;
ELSE
SELECT -1 INTO outid;
END IF;
SELECT outid INTO userId;
ELSE
INSERT INTO Users(user_Pwd,user_MobileCode,user_Visibility,user_Level,user_RegTime,
user_RegIP,user_Collecter,user_Collected)
VALUES (user_Pwd,user_MobileCode,6,6,NOW(),user_RegIP,0,0);
SET userId=LAST_INSERT_ID();
SELECT userId;
END IF;
END //
DELIMITER ;
知识点：
1）参数分为 in, out 类型，即输入类型和输出类型；
2）select xx into varible from table where ... 句式：
SELECT COUNT(*) INTO cnt FROM Users u WHERE u.user_MobileCode=user_MobileCode;
3）if cnt > 0 then ... elseif cnt =0 then ... else ... end if;
if 语句注意带有 then 关键字和 end if 结束关键字。
4）获取 insert 语句的主键：set userId=last_insert_id(); select userId;
select last_insert_id() into userId; 也是可以的。
5）如何调用该存储过程：
CALL loginandreg(@userId,'112358','18357xxx7','127.0.0.1');
SELECT @userId;
最后的 select @userId 就是存储过程的 out 类型参数返回的结果。
2. 例子2
DELIMITER //
DROP PROCEDURE IF EXISTS mingRenTangJiangLi //
CREATE PROCEDURE mingRenTangJiangLi()
BEGIN
DECLARE total_level,role_id,ming_ren_level,ming_ren_type,
fuben_times,tiaozhan_times,duobei_shijian,no_more_data INT DEFAULT 0;
DECLARE my_cursor CURSOR FOR SELECT playerRoleId,`level`,type from mingrentang;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_data = 1;
OPEN my_cursor;
FETCH my_cursor INTO role_id,ming_ren_level,ming_ren_type;
REPEAT
set total_level = ming_ren_level + 10 * (ming_ren_type-1);
set fuben_times = total_level / 2;
set tiaozhan_times = total_level /3;
set duobei_shijian = 10 * total_level;
select total_level,fuben_times,tiaozhan_times,duobei_shijian;
update player_role set hufu=hufu+1000,paihangbangNumber=paihangbangNumber+tiaozhan_times,
duobeiShiJian=duobeiShiJian+duobei_shijian,fubenTimes=fubenTimes+fuben_times;
FETCH my_cursor INTO role_id,ming_ren_level,ming_ren_type;
UNTIL no_more_data = 1
END REPEAT;
CLOSE my_cursor;
END //
DELIMITER ;
知识点：
1）该例子演示了游标的用法：
DECLARE my_cursor CURSOR FOR SELECT playerRoleId,`level`,type from mingrentang;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_data = 1;
定义了游标语句，也说明了游标循环结束时设置的标志：SET no_more_data = 1;
OPEN my_cursor;
FETCH my_cursor INTO role_id,ming_ren_level,ming_ren_type;
打开游标，从游标中获取值。
REPEAT
......
FETCH my_cursor INTO role_id,ming_ren_level,ming_ren_type;
UNTIL no_more_data = 1
END REPEAT;
repeat 循环 直到 no_more_data = 1： UNTIL no_more_data = 1，然后结束循环 END REPEAT;
最后关闭游标 close my_cursor;
因为上面在定义游标时，指明了，没有数据时设置了 no_more_data = 1，所以这里使用 UNTIL no_more_data = 1 来退出repeat
2）判断相等是使用 = ，而不是 == ，赋值操作是使用 set var=xxx; ：set fuben_times = total_level / 2;
3. Java 如何调用存储过程
1）hibernate调用存储过程：
/*
* 调用无参数的存储过程，传入存储过程名字
*/
public int callProcedure(final String procedureName)
{
int count = (Integer)this.getHibernateTemplate().execute(
new HibernateCallback(){
public Object doInHibernate(Session session) throws HibernateException, SQLException {
String procedureSql = "{call "+ procedureName +"()}";
Query query = session.createSQLQuery(procedureSql);
Integer num = query.executeUpdate();
return num;
}
});
return count;
}
2）ibatis 调用mysql 存储过程：
@Override
public Long loginAndRegByProcedure(String user_Pwd, String user_MobileCode, String user_RegIP){
Long userId = null;
HashMap paramMap = new HashMap();
paramMap.put("userId", userId);
paramMap.put("user_Pwd", user_Pwd);
paramMap.put("user_MobileCode", user_MobileCode);
paramMap.put("user_RegIP", user_RegIP);
this.getSqlMapClientTemplate().queryForObject("Users.loginAndRegByProcedure", paramMap);
return (Long)paramMap.get("userId");
}
对应的xml 文件配置：
{call loginandreg(?, ?, ?, ?)}
存储过程的参数的类型，是在xml文件中说明的。
3) JDBC 调用mysql 存储过程：
public Long loginAndRegByProcedure2(String user_Pwd, String user_MobileCode, String user_RegIP){
Connection conn = DbUtil.getConnection();
CallableStatement cstmt = conn.prepareCall("{call loginandreg(?, ?, ?, ?)}");
cstmt.setString(2, user_Pwd);
cstmt.setString(3, user_MobileCode);
cstmt.setString(4, user_RegIP);
cstmt.registerOutParameter(1, java.sql.Types.BIGINT);
cstmt.execute();
return cstmt.getLong(1);
}
输入参数：cstmt.setString(2, user_Pwd);
输出参数：cstmt.registerOutParameter(1, java.sql.Types.BIGINT);