定义游标，打开游标，-------------关闭游标，请问中间的过程怎样使用比如定义那一行，和提取到变量去(10分)

定义游标，打开游标，-------------关闭游标，请问中间的过程怎样使用比如定义那一行，和提取到变量去
游标中间的那个部分我老是学不上手
前辈门提供例子给我

帮助里好多，自己查一下
USE pubs
GO

-- Declare the variables to store the values returned by FETCH.
DECLARE @au_lname varchar(40), @au_fname varchar(20)


DECLARE authors_cursor CURSOR FOR
SELECT au_lname, au_fname FROM authors
WHERE au_lname LIKE "B%"
ORDER BY au_lname, au_fname

OPEN authors_cursor

-- Perform the first fetch and store the values in variables.
-- Note: The variables are in the same order as the columns
-- in the SELECT statement.

FETCH NEXT FROM authors_cursor
INTO @au_lname, @au_fname

-- Check @@FETCH_STATUS to see if there are any more rows to fetch.
WHILE @@FETCH_STATUS = 0
BEGIN

-- Concatenate and display the current values in the variables.
PRINT "Author: " + @au_fname + " " + @au_lname

-- This is executed as long as the previous fetch succeeds.
FETCH NEXT FROM authors_cursor
INTO @au_lname, @au_fname
END

CLOSE authors_cursor
DEALLOCATE authors_cursor
GO

Author: Abraham Bennet
Author: Reginald Blotchet-Halls