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SCROLL - Creating Cursors for Backward Scrolling in SQL Server
How To Create a Scrollable Cursor with the SCROLL Option in SQL Server Transact-SQL?
✍: FYIcenter.com
SQL Server offers two scrolling option on cursors:
1. FORWARD_ONLY - The cursor can only be scrolled forward with "FETCH NEXT" statements. In another word, you can only loop through the cursor from the first row to the last row. FORWARD_ONLY is the default option.
2. SCROLL - The cursor can be scrolled back and forth with "FETCH NEXT", "FETCH PRIOR", and other fetch options.
The tutorial example below creates a cursor with the SCROLL option so that the result set can be looped through backward:
DECLARE @fyi_cursor CURSOR;
SET @fyi_cursor = CURSOR SCROLL FOR
SELECT id, url, notes, counts, time
FROM fyi_links ORDER BY id;
OPEN @fyi_cursor;
DECLARE @id INT, @url VARCHAR(80), @notes VARCHAR(80),
@counts INT, @time DATETIME;
FETCH LAST FROM @fyi_cursor INTO @id, @url, @notes,
@counts, @time;
WHILE @@FETCH_STATUS = 0 BEGIN
PRINT CONVERT(CHAR(5),ISNULL(@id,0))
+CONVERT(CHAR(18),ISNULL(@url,'NULL'))
+CONVERT(CHAR(20),ISNULL(@notes,'NULL'))
+CONVERT(CHAR(4),ISNULL(@counts,0))
+CONVERT(CHAR(11),ISNULL(@time,'2007'));
FETCH PRIOR FROM @fyi_cursor INTO @id, @url, @notes,
@counts, @time;
END
CLOSE @fyi_cursor;
DEALLOCATE @fyi_cursor;
GO
2102 dba.fyicenter.com NULL 0 Jan 1 2007
2101 dev.fyicenter.com NULL 0 Jan 1 2007
1101 moc.retneciyf.ved NULL 0 Jan 1 2007
302 myspace.com Added today! 0 Jul 1 2007
301 netscape.com Added long time ago!0 Jan 1 1999
202 www.yahoo.com It's another search 0 Jan 1 2007
102 dba.fyicenter.com Nice site. 8 Jan 1 2007
101 dev.fyicenter.com NULL 0 Jan 1 2007
⇒ DYNAMIC - Creating Dynamic Cursors in SQL Server
⇐ Declaring and Using Cursor Variables in SQL Server
2016-10-17, 3165🔥, 0💬
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