存储过程之循环遍历查询结果集

-- 创建存储过程之前需判断该存储过程是否已存在，若存在则删除
DROP PROCEDURE IF EXISTS shxc40;
-- 创建存储过程
CREATE PROCEDURE shxc40()
BEGIN

-- 定义变量
DECLARE s int DEFAULT 0;
DECLARE p varchar(255);
DECLARE s1 varchar(255);
DECLARE k varchar(256);
DECLARE r varchar(256);
DECLARE u varchar(256);

-- 定义游标，并将sql结果集赋值到游标中
DECLARE report CURSOR FOR select upperpolicyno,serialno,kindcode,oldregistno,uniqueno from shxh40_test;

-- 声明当游标遍历完后将标志变量置成某个值
DECLARE CONTINUE HANDLER FOR NOT FOUND SET s=1;

-- 打开游标
open report;

-- 将游标中的值赋值给变量，注意：变量名不要和返回的列名同名，变量顺序要和sql结果列的顺序一致
fetch report into p,s1,k,r,u;

-- 当s不等于1，也就是未遍历完时，会一直循环
while s<>1 do

-- 执行业务逻辑
UPDATE icp_claim_info_shxh40 info,icp_engage_shxh40 engage set info.oldregistno = r, info.uniqueno = u
where info.registno = engage.registno
and info.sourceflag = '34'
and info.endcasedate = '2019-07-15'
and info.upperpolicyno =p
and engage.serialno = s1
and engage.kindcode = k
and oldregistno is null;

-- 当s等于1时表明遍历以完成，退出循环
fetch report into p,s1,k,r,u;
end while;
-- 关闭游标
close report;
END;