MySQL存储过程例子代码,MYSQL代码库,德仔网

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【MYSQL】 MySQL存储过程例子
作者:Dezai.CN / 发布于2012/8/1/ 1090
MySQL存储过程例子，包含事务，参数，嵌套调用，游标，循环等
<div><span style="font-family: 宋体; font-size: 12px;">----------------------------------   </span>
<span style="font-family: 宋体; font-size: 12px;">-- rep_shadow_rs   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 用来处理信息的增加，更新和删除   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 每次只更新上次以来没有做过的数据   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 根据不同的标志位   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 需要一个输出的参数，   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 如果返回为0，则调用失败，事务回滚   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 如果返回为1，调用成功，事务提交   </span>
<span style="font-family: 宋体; font-size: 12px;">--   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 测试方法   </span>
<span style="font-family: 宋体; font-size: 12px;">-- call pro_rep_shadow_rs(@rtn);   </span>
<span style="font-family: 宋体; font-size: 12px;">-- select @rtn;   </span>
<span style="font-family: 宋体; font-size: 12px;">----------------------------------   </span>
<span style="font-family: 宋体; font-size: 12px;">create procedure pro_rep_shadow_rs(out rtn int)   </span>
<span style="font-family: 宋体; font-size: 12px;">begin   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 声明变量，所有的声明必须在非声明的语句前面   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare iLast_rep_sync_id int default -1;   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare iMax_rep_sync_id int default -1;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 如果出现异常，或自动处理并rollback,但不再通知调用方了   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 如果希望应用获得异常，需要将下面这一句，以及启动事务和提交事务的语句全部去掉   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare exit handler for sqlexception rollback;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 查找上一次的   </span>
<span style="font-family: 宋体; font-size: 12px;">    select eid into iLast_rep_sync_id from rep_de_proc_log where tbl='rep_shadow_rs';   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 如果不存在，则增加一行   </span>
<span style="font-family: 宋体; font-size: 12px;">    if iLast_rep_sync_id=-1 then   </span>
<span style="font-family: 宋体; font-size: 12px;">      insert into rep_de_proc_log(rid,eid,tbl) values(0,0,'rep_shadow_rs');   </span>
<span style="font-family: 宋体; font-size: 12px;">      set iLast_rep_sync_id = 0;   </span>
<span style="font-family: 宋体; font-size: 12px;">    end if;   </span>
<span style="font-family: 宋体; font-size: 12px;">       </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 下一个数字   </span>
<span style="font-family: 宋体; font-size: 12px;">    set iLast_rep_sync_id=iLast_rep_sync_id+1;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 设置默认的返回值为0：失败   </span>
<span style="font-family: 宋体; font-size: 12px;">    set rtn=0;   </span>
<span style="font-family: 宋体; font-size: 12px;">       </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 启动事务   </span>
<span style="font-family: 宋体; font-size: 12px;">    start transaction;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 查找最大编号   </span>
<span style="font-family: 宋体; font-size: 12px;">    select max(rep_sync_id) into iMax_rep_sync_id from rep_shadow_rs;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 有新数据   </span>
<span style="font-family: 宋体; font-size: 12px;">    if iMax_rep_sync_id>=iLast_rep_sync_id then   </span>
<span style="font-family: 宋体; font-size: 12px;">        -- 调用   </span>
<span style="font-family: 宋体; font-size: 12px;">        call pro_rep_shadow_rs_do(iLast_rep_sync_id,iMax_rep_sync_id);   </span>
<span style="font-family: 宋体; font-size: 12px;">        -- 更新日志   </span>
<span style="font-family: 宋体; font-size: 12px;">        update rep_de_proc_log set rid=iLast_rep_sync_id,eid=iMax_rep_sync_id where tbl='rep_shadow_rs';   </span>
<span style="font-family: 宋体; font-size: 12px;">    end if;   </span>
<span style="font-family: 宋体; font-size: 12px;">       </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 运行没有异常，提交事务   </span>
<span style="font-family: 宋体; font-size: 12px;">    commit;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 设置返回值为1  </span>
<span style="font-family: 宋体; font-size: 12px;">    set rtn=1;   </span>
<span style="font-family: 宋体; font-size: 12px;">end;   </span>
<span style="font-family: 宋体; font-size: 12px;">|   </span>
<span style="font-family: 宋体; font-size: 12px;">delimiter ;   </span>
<span style="font-family: 宋体; font-size: 12px;">drop procedure if exists pro_rep_shadow_rs_do;   </span>
<span style="font-family: 宋体; font-size: 12px;">delimiter |   </span>
<span style="font-family: 宋体; font-size: 12px;">---------------------------------   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 处理指定编号范围内的数据   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 需要输入2个参数   </span>
<span style="font-family: 宋体; font-size: 12px;">-- last_rep_sync_id 是编号的最小值   </span>
<span style="font-family: 宋体; font-size: 12px;">-- max_rep_sync_id 是编号的最大值   </span>
<span style="font-family: 宋体; font-size: 12px;">-- 无返回值   </span>
<span style="font-family: 宋体; font-size: 12px;">---------------------------------   </span>
<span style="font-family: 宋体; font-size: 12px;">create procedure pro_rep_shadow_rs_do(last_rep_sync_id int, max_rep_sync_id int)   </span>
<span style="font-family: 宋体; font-size: 12px;">begin   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare iRep_operationtype varchar(1);   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare iRep_status varchar(1);   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare iRep_Sync_id int;   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare iId int;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 这个用于处理游标到达最后一行的情况   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare stop int default 0;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 声明游标   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare cur cursor for select id,Rep_operationtype,iRep_status,rep_sync_id from rep_shadow_rs where rep_sync_id between last_rep_sync_id and max_rep_sync_id;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 声明游标的异常处理，设置一个终止标记   </span>
<span style="font-family: 宋体; font-size: 12px;">    declare CONTINUE HANDLER FOR SQLSTATE '02000' SET stop=1;   </span>
<span style="font-family: 宋体; font-size: 12px;">       </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 打开游标   </span>
<span style="font-family: 宋体; font-size: 12px;">    open cur;   </span>
<span style="font-family: 宋体; font-size: 12px;">       </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 读取一行数据到变量   </span>
<span style="font-family: 宋体; font-size: 12px;">    fetch cur into iId,iRep_operationtype,iRep_status,iRep_Sync_id;   </span>
<span style="font-family: 宋体; font-size: 12px;">    -- 这个就是判断是否游标已经到达了最后   </span>
<span style="font-family: 宋体; font-size: 12px;">    while stop <> 1 do  </span>
<span style="font-family: 宋体; font-size: 12px;">        -- 各种判断   </span>
<span style="font-family: 宋体; font-size: 12px;">        if iRep_operationtype='I' then   </span>
<span style="font-family: 宋体; font-size: 12px;">            insert into rs0811 (id,fnbm) select id,fnbm from rep_shadow_rs where rep_sync_id=iRep_sync_id;   </span>
<span style="font-family: 宋体; font-size: 12px;">        elseif iRep_operationtype='U' then   </span>
<span style="font-family: 宋体; font-size: 12px;">        begin   </span>
<span style="font-family: 宋体; font-size: 12px;">            if iRep_status='A' then   </span>
<span style="font-family: 宋体; font-size: 12px;">                insert into rs0811 (id,fnbm) select id,fnbm from rep_shadow_rs where rep_sync_id=iRep_sync_id;   </span>
<span style="font-family: 宋体; font-size: 12px;">            elseif iRep_status='B' then   </span>
<span style="font-family: 宋体; font-size: 12px;">                delete from rs0811 where id=iId;   </span>
<span style="font-family: 宋体; font-size: 12px;">            end if;   </span>
<span style="font-family: 宋体; font-size: 12px;">        end;   </span>
<span style="font-family: 宋体; font-size: 12px;">        elseif iRep_operationtype='D' then   </span>
<span style="font-family: 宋体; font-size: 12px;">            delete from rs0811 where id=iId;   </span>
<span style="font-family: 宋体; font-size: 12px;">        end if;    </span>
<span style="font-family: 宋体; font-size: 12px;">           </span>
<span style="font-family: 宋体; font-size: 12px;">        -- 读取下一行的数据    </span>
<span style="font-family: 宋体; font-size: 12px;">        fetch cur into iId,iRep_operationtype,iRep_status,iRep_Sync_id;   </span>
<span style="font-family: 宋体; font-size: 12px;">    end while;  -- 循环结束   </span>
<span style="font-family: 宋体; font-size: 12px;">    close cur; -- 关闭游标   </span>
<span style="font-family: 宋体; font-size: 12px;"> end; </span>
</div>
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