MySql--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;