fetch_next.sql

本程序中即有讲义

--在简单的游标中使用 FETCH
--下例为 authors 表中姓以字母 B 开头的行声明了一个简单的游标，
--并使用 FETCH NEXT 逐个提取这些行。
--FETCH 语句以单行结果集形式返回由 DECLARE CURSOR 指定的列的值。

USE pubs
GO
DECLARE authors_cursor CURSOR FOR
SELECT au_lname FROM authors
WHERE au_lname LIKE 'B%'
ORDER BY au_lname

OPEN authors_cursor

-- Perform the first fetch.
FETCH NEXT FROM authors_cursor

-- Check @@FETCH_STATUS to see if there are any more rows to fetch.
WHILE @@FETCH_STATUS = 0
BEGIN
   -- This is executed as long as the previous fetch succeeds.
   FETCH NEXT FROM authors_cursor
END

CLOSE authors_cursor
DEALLOCATE authors_cursor
GO