Mysql 游标示例

CREATE  PROCEDURE `gk_test`()

COMMENT '测试数据'  -- 函数注释

BEGIN

    DECLARE done INT DEFAULT FALSE -- 定义遍历数据结束标志。非游标变量，需要定义在游标变量前

    DECLARE m_id CHAR(32) -- 定义接收游标数据中id变量

    DECLARE m_or VARCHAR(255) -- 定义接收游标数据中orderno变量

    DECLARE m_c INT(11)  -- 定义接收游标数据中count变量

    DECLARE m_soult CURSOR FOR SELECT `id`, `orderno`, count(*) t FROM hb_shipper_order GROUP BY orderno HAVING t >1   -- 定义游标变量，即接收查询结果集

    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE  -- 将结束标志绑定到游标

    OPEN m_soult    -- 打开游标

    read_loop:LOOP   -- 开始循环。这个是mysql 3种循环中的1种。

        FETCH m_soult INTO m_id,m_or,m_c   -- 提取游标数据

        IF done THEN   -- 判断，当为true时

            LEAVE read_loop   -- 跳出循环

        END IF

        -- 处理事 自己想处理的事

        UPDATE `hb_shipper_waybill` SET

        ordernos = REPLACE (`ordernos`, m_or, CONCAT(m_or,'-2')),

        goodsname = REPLACE (`goodsname`, m_or, CONCAT(m_or,'-2'))

        WHERE `id` IN ( SELECT `waybillid` FROM `hb_shipper_order_waybill_relation` WHERE orderid = m_id)

        UPDATE `hb_shipper_order` SET orderno = CONCAT(m_or,'-2') WHERE id = m_id

    END LOOP  -- 结束循环

    -- 关闭游标

    CLOSE m_soult

END

上图：

DEMO: 2    // 通过 存储过程，处理  copy 数据并处理对应数据关系

delimiter $$

DROP PROCEDURE IF EXISTS gk

CREATE DEFINER =  PROCEDURE `gk`(IN pname varchar(255))

    COMMENT '测试'

    BEGIN

        DECLARE new_id CHAR(32)

        DECLARE m_id CHAR(32)

        DECLARE new_noids VARCHAR(255)

        DECLARE done INT DEFAULT 0

        DECLARE m_result CURSOR FOR select id from `xxx`

        DECLARE m_result2 CURSOR FOR select id from `xxx`

        DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1

        DROP TABLE IF EXISTS `xxx`

        CREATE TABLE `xxx` (

                `id` char(32) NOT NULL COMMENT 'ID',

                `subsystem` char(32) NOT NULL COMMENT '',

                `name` varchar(20) NOT NULL COMMENT '',

                `type` varchar(15) NOT NULL COMMENT '',

                `url` varchar(200) DEFAULT NULL COMMENT '',

                `icon` varchar(20) DEFAULT NULL COMMENT '',

                `target` varchar(10) NOT NULL DEFAULT '_self' COMMENT '',

                `method` mediumtext COMMENT '',

                `orderby` smallint(3) NOT NULL DEFAULT '0' COMMENT '',

                `parentid` char(32) NOT NULL DEFAULT '0' COMMENT '',

                `relateid` char(32) NOT NULL COMMENT '',

                `isopen` tinyint(1) NOT NULL DEFAULT '1' COMMENT '',

                `nodeids` varchar(255) DEFAULT NULL COMMENT '',

                `nodenum` smallint(3) NOT NULL DEFAULT '0' COMMENT '',

                `createtime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '',

                `createuser` char(32) NOT NULL DEFAULT '0' COMMENT '',

                `updatetime` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '',

                `udateuser` char(32) NOT NULL DEFAULT '0' COMMENT '',

                `deleted` tinyint(1) DEFAULT '0' COMMENT '',

                `status` tinyint(1) NOT NULL DEFAULT '0' COMMENT '',

                `isdefault` tinyint(1) unsigned NOT NULL DEFAULT '0' COMMENT '',

                `isdisable` tinyint(1) unsigned NOT NULL DEFAULT '0' COMMENT '',

                `projecttype` varchar(255) NOT NULL COMMENT '',

            PRIMARY KEY (`id`)

        ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT

        INSERT INTO `xxxx` SELECT * FROM `aaa` WHERE `projecttype` = 'T'

        UPDATE `xxx` SET `projecttype` = pname

        OPEN m_result

        REPEAT

                FETCH m_result INTO m_id

                        SET new_id = UPPER(REPLACE(UUID(),'-',''))

                        UPDATE `xxx` SET `id` = new_id WHERE `id` = m_id

                        UPDATE `xxx` SET `parentid` = new_id WHERE `parentid` = m_id

        UNTIL done END REPEAT

        CLOSE m_result

        SET done = 0

        OPEN m_result2

        REPEAT

                FETCH m_result2 INTO m_id

                        SELECT CONCAT(',', GROUP_CONCAT(`id`)) INTO new_noids FROM `xxx` WHERE `parentid` = m_id

                        UPDATE `xxx` SET `nodeids` = new_noids WHERE `id` = m_id

        UNTIL done END REPEAT    

        CLOSE m_result2

        INSERT INTO `aaa` SELECT * FROM `xxx`

        DROP TABLE IF EXISTS xxx

    END $$

delimiter

myql 在实战使用过程中会遇到不同的场景，针对不同场景，使用方式需要整理记录，给以后遇到类似问题做参考使用。

这里主要是对dual虚拟表的一种认识。实际上可以直接函数方式：

【场景描述】

类似手机号，需要中间4位 ‘*’ 处理。如：“ 187****4567 ”，姓名3个字的中间1位 ‘*’ 处理，2个字的后面1位 ‘*’处理。如: “ 李 * , 张*研 ”

【实现方式】

（1） insert(mobile, 4,4,'****') :函数

（2） concat(left(mobile,3), '****', right(mobile,4)) :联接函数

（3） REPLACE(mobile, SUBSTR(mobile,4,4), '****') :替换函数

【实现语句】

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