游标的使用

如下图，想把address和内容两个字段拼接后，放到NewFiled字段里。这回我用了游标。

 

-- 方法1：游标
-- 声明变量
DECLARE
    @address AS NVARCHAR(50),
    @neirong AS NVARCHAR(50);
    
-- 声明游标
DECLARE C_MemberPhone CURSOR FAST_FORWARD FOR
    SELECT address,neirong
    FROM huiyi;
    --ORDER BY empid;
    
OPEN C_MemberPhone;

-- 取第一条记录
FETCH NEXT FROM C_MemberPhone INTO @address,@neirong;

WHILE @@FETCH_STATUS=0
BEGIN
    -- 操作
    UPDATE huiyi SET NewFiled= @address+' '+@neirong WHERE address=@address and neirong=@neirong;
    
    -- 取下一条记录
    FETCH NEXT FROM C_MemberPhone INTO @address,@neirong;
END

-- 关闭游标
CLOSE C_MemberPhone;

-- 释放游标
DEALLOCATE C_MemberPhone;