mysql存储过程游标的运用，适合对游标刚学习者。

近来，因业务的需要写了一个存储，放上面晒晒。适合对游标刚学习者，大致业务是实现对多张表审核操作需要插入审核消息记录

--创建带有三个输入参数，一个输出参数的存储

create procedure prop_dealMessage (in ids integer ,in status1 integer ,in op integer , out ids1 varchar(20))

begin

--声明业务变量

declare v_sql varchar(100);

declare var1 varchar(20);

declare message text;

declare var2 varchar(20);

declare var3 integer;

--声明游标并标记游标是否可读；no_more_departments = 0 可读；no_more_departments = 1 不可读；这里大量声明了多个游标其实不可取，但用动态sql也不好处理，为了
--完成任务暂时就这么写上去了。

declare no_more_departments integer default 0;

declare c_result cursor for select title,createuser from project_info where id = ids;

declare c_result1 cursor for select p.title,pd.userId from project_detail pd left join project_info p on p.id = pd.projectinfoId where pd.id = ids;

declare CONTINUE HANDLER FOR NOT FOUND

SET no_more_departments =1;

set ids1 = ",";

--处理我的业务逻辑，读者不用关心细节

if (op = 1 || op =7) then

if status1 = 22 then set message = ( select concat("恭喜!你的项目已通过审核成功发布!-"));

elseif status1 = 23 then set message = "伤心!你的项目未通过审核,下次努力!-" ;

elseif status1 = 21 then set message = "耐心! 后台正在复审!-" ;

end if;

open c_result; --打开游标

dept_loop:REPEAT

FETCH C_RESULT INTO var1 ,var3; --将游标每次迭代的数据赋值给变量var1,var3

IF no_more_departments= 0 THEN

insert into user_message(receiveid,sendid,content,type,enabled,isDeleted,Createdate) values( var3,-1, concat(message,"\"",var1,"\""),11,1,0,now());--满足条件执行插入数据

select last_insert_id() into var2;

set ids1 = concat(ids1 ,var2 ,",");

END IF;

UNTIL no_more_departments END REPEAT dept_loop;

close c_result; --关闭游标

elseif op =2 then

if status1 = 22 then set message = ( select concat("恭喜!你通过审核成功加入-"));

elseif status1 = 23 then set message = "伤心!你未通过审核失败加入!-" ;

elseif status1 = 21 then set message = "耐心! 后台正在复审!-" ;

end if;

open c_result1;

dept_loop:REPEAT

FETCH C_RESULT1 INTO var1 ,var3;

IF no_more_departments= 0 THEN

insert into user_message(receiveid,sendid,content,type,enabled,isDeleted,Createdate) values( var3,-1, concat(message,"\"",var1,"\""),11,1,0,now());

select last_insert_id() into var2;

set ids1 = concat(ids1 ,var2 ,",");

END IF;

UNTIL no_more_departments END REPEAT dept_loop;

close c_result1;

end if;

end

--调用带差存储

call prop_dealMessage(4, 22,8,@x);

select @x;

--总结：读者只要将游标的适用当做循环的适用方法，就很好学习游标的运用了。