mysql存储过程嵌套循环并分页处理数据

业务背景：公司存证产品升级，随着数据量的增加，存证产品线按业务分表，导致以往的存证关联数据需要做数据同步更新。版本发布前，通过当前存储过程解决数据升级问题。

##创建存证文档关联情况下更新所用存储过程 CREATE PROCEDURE evi_doc_refs_eid_deal() begin
    declare pageNum int default 0; declare totalSize int default 0; declare pageSize int default 5; declare totalPage int DEFAULT 0; declare startIndex int default 0; select count(*) into totalSize from osv_service_evidence where type != 11 and type !=12 and type !=50 ; set totalPage = totalSize/pageSize; while ( pageNum<totalPage-1) do #对分页的起始下标计算，以便分页查询时使用 set startIndex = pageNum *pageSize; #开启事务 　START TRANSACTION; #嵌套内部分页查询，通过游标处理分页查询结果记录 begin #声明变量 declare eviId varchar(50); declare evidenceEid varchar(50); declare done int default 0; declare mark varchar(2); declare eid_value varchar(50); declare type_value int default 0; declare eid_mark varchar(50); 　　　　 declare num int DEFAULT 0; 　　　　#定义分页查询结果的游标 declare i_cur cursor for select id from osv_service_evidence where type !=11 and type !=12 and type !=50 limit startIndex,pageSize; declare continue handler for sqlstate '09000' set done = 1; open i_cur; fetch next from i_cur into eviId; WHILE (done = 0 ) do #判断每页中处理数据的下标index set num = num+1; select type into type_value  from osv_service_evidence where id = eviId; select e.eid into eid_value from osv_service_evidence e where id = eviId; if(0 =type_value|null = eid_value) then fetch next from i_cur into eviId; end if; 　　　　　　#数据处理 if     type_value =40 then set mark = 'O'; set eid_mark=concat(mark,eid_value);update evi_doc_refs set docEid = eid_mark where docEviId = eviId; elseif type_value =11 then set mark = 'S'; set eid_mark=concat(mark,eid_value);update evi_doc_refs set docEid = eid_mark where docEviId = eviId;set done = 0; end if; 　　　　　#如果当前页处理的数据已达页记录数值，通过done退出内部循环，进入外部循环 　　　　 IF num = pageSize THEN set done = 1; 　　　　 #否则继续当前循环 　　　　　　ELSEIF num !=pageSize THEN set done =0; 　　　　　　fetch next from i_cur into eviId; 　　　　　 END IF; END WHILE; 　　　　#关闭游标 close i_cur; end ; COMMIT; 　　#更新下一次处理的页码，+1
        set pageNum = pageNum+1; end while; END;

call evi_doc_refs_eid_deal();

 

##创建出证订单表中存证编号为null的情况下更新所用存储过程 create procedure evi_order_refs_eid_deal() begin
declare original_eviId varchar(50); declare evidenceEid varchar(50); declare done int default 0; declare mark varchar(2); declare eid_value varchar(50); declare type_value int default 0; declare eid_mark varchar(50); # declare existence boolean ; ## declare cur cursor for select eviId  from evi_order_refs where evidenceEid is null order by createTime desc; ##异常处理(触发sql语句失败，执行结束) declare continue handler for sqlstate '09000' set done = 1; open cur; ##取出游标值至变量中 fetch next from cur into original_eviId; 　　repeat if not done then 
       
                    select type into type_value  from osv_service_evidence where id = original_eviId; #逻辑判断，如果eviId确实在存证表中无记录，直接忽略该条出证记录 select e.eid into eid_value from osv_service_evidence e where id = original_eviId; #逻辑判断，如果eviId确实在存证表中无记录，直接忽略该条出证记录 if(0 =type_value|null = eid_value) then fetch next from cur into original_eviId; end if; if     type_value =40 then set mark = 'O';set eid_mark=concat(mark,eid_value);update evi_order_refs set evidenceEid = eid_mark where eviId = original_eviId; elseif type_value =11 then set mark = 'S';set eid_mark=concat(mark,eid_value);update evi_order_refs set evidenceEid = eid_mark where eviId = original_eviId;else  set done = 0; 　　　　　　　　　　　　end if; 　　　　　　end if; #if(done = 1) then leave cur; ##重新抓取数据进入循环 fetch next from cur into original_eviId; ##结束循环 until done end repeat; ##关闭游标 close cur; end ;