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+1.定义游标
+
+declare 游标名称 cursor select_statement
+
+2.打开游标
+
+open 游标名称
+
+3.获取游标
+
+fetch 结果集 into 变量
+
+4.关闭
+
+close 游标名称
+
+
+
+1.利用游标，查询并计算出emp表中全公司的总薪资(sal和comm)
+
+drop procedure UU;
+delimiter //
+create procedure UU(out n int)
+begin 
+ declare s int;
+ declare c int;
+ declare i int default 1;
+ declare num cursor for select sal,ifnull(comm,0) from emp;
+ declare continue handler for 1329 set i=2;
+ set n=0;
+ open num ;
+while  i=1 do
+ fetch num into s,c;
+ set n=n+s+c;
+end while;
+ close num;
+end //
+delimiter ;
+call UU(@nn);
+select @nn;
+
+
+
+-- 2.利用游标修改表格，如果sal<1000,则删除工资为此值的员工，如果1000 < sal <= 3000,该员工薪资涨100并将该员工的信息放在新表中，否则扣工资100
+
+drop procedure II;
+delimiter //
+create procedure II()
+begin 
+  declare id int;
+  declare nsal int;
+  declare i int default 1;
+	declare num1 cursor for select empno,sal from emp;
+	declare continue handler for 1329 set i=2;
+	open num1;
+	create table if not exists xinbiao(
+	     empno int primary key auto_increment,
+ 	     sal int 
+	 );
+	while i=1 do 
+	 fetch num1 into id,nsal;
+	 if nsal<1000 then delete from emp where empno=id;
+	   elseif 1000<nsal and nsal>=3000 then update emp set sal=sal+100 where empno=id;
+	   insert into xinbiao values(id,nsal);
+	   else update emp set sal=sal-100 where empno=id;
+	 end if;
+	end while;
+	close num1;
+end //
+delimiter ;
+call II();
+select * from xinbiao;
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