SQL游标

游标创建步骤~~~谢啦

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看一下帮助文档

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SQL code:
A. 使用简单游标和语法
打开该游标时所生成的结果集包括 pubs 数据库的 authors 表中的所有行和列。可以更新该游标，对该游标所做的所有更新和删除均在提取中表现出来。因为没指定 SCROLL 选项，FETCH NEXT 是唯一可用的提取选项。

DECLARE authors_cursor CURSOR
FOR SELECT * from authors
OPEN authors_cursor
FETCH NEXT from authors_cursor

B. 使用嵌套游标生成报表输出
下例显示如何嵌套游标以生成复杂的报表。为每个作者声明内部游标。

SET NOCOUNT ON

DECLARE @au_id varchar(11), @au_fname varchar(20), @au_lname varchar(40),
@message varchar(80), @title varchar(80)

PRINT "-------- Utah Authors report --------"

DECLARE authors_cursor CURSOR FOR
SELECT au_id, au_fname, au_lname
from authors
WHERE state = "UT"
ORDER BY au_id

OPEN authors_cursor

FETCH NEXT from authors_cursor
INTO @au_id, @au_fname, @au_lname

WHILE @@FETCH_STATUS = 0
BEGIN
PRINT " "
SELECT @message = "----- Books by Author: " +
@au_fname + " " + @au_lname

PRINT @message

-- Declare an inner cursor based
-- on au_id from the outer cursor.

DECLARE titles_cursor CURSOR FOR
SELECT t.title
from titleauthor ta, titles t
WHERE ta.title_id = t.title_id AND
ta.au_id = @au_id -- Variable value from the outer cursor

OP