Deallocate A Cursor On Error
Contents |
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us deallocate cursor without close Learn more about Stack Overflow the company Business Learn more about hiring developers close cursor sql server or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow cursor_status Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up T-sql Cursor, what will happen in case of
Sql Server Deallocate Cursor If Exists
error? up vote 3 down vote favorite What will happen if an error occurs during: Declaring a cursor Fetching data What will happen if the error occurs before the cursor is closed? Does it close automatically? When I use a cursor, what is the best practice for handling errors? sql-server tsql share|improve this question edited May 1 '12 at 10:49 Mark Byers 447k8810921192 asked Oct 10 '10 try catch in cursor sql server at 3:04 Costa 1,24373262 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote accepted When an error occurs after declaring the cursor and the batch terminates, the cursor will remain open. The cursor will be closed after the connection is closed. If you can capture the error, it is good practice to close the cursor as part of the error handling. share|improve this answer answered Oct 10 '10 at 3:35 bobs 16.3k93957 add a comment| up vote 2 down vote Updated with a better solution The [CURSOR_STATUS][1] function can be used to check the state of a cursor. In SQL 2005 and later, this can be wrapped in a TRY...CATCH block. Something like BEGIN TRY DECLARE
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn error handling in cursor sql server more about Stack Overflow the company Business Learn more about hiring developers or
Global Cursor In Sql Server
posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow
A Cursor With The Name 'db_cursor' Already Exists
Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What happens when you forget to close and deallocate http://stackoverflow.com/questions/3898845/t-sql-cursor-what-will-happen-in-case-of-error cursor? up vote 22 down vote favorite 5 Leaving cursor open is known as a bad practice. But what really happens when you forget to close and/or deallocate it? How does it affect SQL Server, connection/session? Are there any differences in consequences for queries, stored procedures and triggers using cursors? sql-server tsql cursor share|improve this question asked Mar 7 '12 at 16:45 Mike 82021323 add a comment| 3 http://stackoverflow.com/questions/9605683/what-happens-when-you-forget-to-close-and-deallocate-cursor Answers 3 active oldest votes up vote 23 down vote accepted It depends on whether you declared the cursor locally or globally (and what the default is in your environment - default is global but you can change it). If the cursor is global, then it can stay "alive" in SQL Server until the last piece of code is touched in the scope in which it was created. For example if you call a stored procedure that creates a global cursor, then call 20 other stored procedures, the cursor will live on while those other 20 stored procedures are running, until the caller goes out of scope. I believe it will stay alive at the session level, not the connection level, but haven't tested this thoroughly. If the cursor is declared as local, then it should only stay in scope for the current object (but again, this is theoretical, and I haven't done extensive, low-level memory tests to confirm). The general concept, though, should be: when you're done with something, say so. In order to make my cursors as efficient as possible, I always use the following declarations: DECLARE c CURSOR LOCAL STATIC FORWARD_ONLY READ_ONLY FOR SELECT ... I've also he
Recent PostsRecent Posts Popular TopicsPopular Topics Home Search Members Calendar Who's On Home http://www.sqlservercentral.com/Forums/Topic767778-338-1.aspx » SQL Server 2005 » T-SQL (SS2K5) » Try/Catch in Cursor It Breaks after failure Try/Catch in Cursor It Breaks after failure Rate Topic Display Mode Topic Options Author http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=124951 Message GhantaGhanta Posted Monday, August 10, 2009 6:17 AM SSC Veteran Group: General Forum Members Last Login: Tuesday, January 3, 2012 11:53 AM Points: 231, Visits: 698 Hey GUys,I sql server do not need the cursor to break after failures and want to iterate through all the records... Any suggestion how can I change this code below? Thanks!BEGIN TRY DECLARE test_cursor CURSOR STATIC FOR SELECT [file_name] , op_format FROM ABC..test --- THIS IS FOR TESTING PURPOSE!!!!!!!!! OPEN test_cursor FETCH NEXT FROM test_cursor INTO @var1, @var2 WHILE @@FETCH_STATUS = 0 cursor sql server BEGIN <<<
SQL Server experts to answer whatever question you can come up with. Our new SQL Server Forums are live! Come on over! We've restricted the ability to create new threads on these forums. SQL Server Forums Profile | ActiveTopics | Members | Search | ForumFAQ Register Now and get your question answered! Username: Password: Save Password Forgot your Password? All Forums SQL Server 2005 Forums Transact-SQL (2005) How to close and deallocate cursor in CATCH Block? Reply to Topic Printer Friendly Author Topic aex Yak Posting Veteran 60 Posts Posted-05/02/2009: 02:53:40 BEGIN TRY DECLARE Cur CURSOR FAST_FORWARD FOR SELECT Id FROM Staff OPEN Cur FETCH NEXT FROM Cur INTO @Id WHILE (@@FETCH_STATUS = 0) BEGIN -- processing.. FETCH NEXT FROM Cur INTO @Id END CLOSE Cur DEALLOCATE Cur END TRY BEGIN CATCH END CATCH Refer to code above, if there is any error happen in -- processing.. line, the error will be trapped in CATCH block, however, the cursor variable is not allocated. Is there any way to close and deallocate the cursor whenever the abovementioned issue happened?aex PeterNeo Constraint Violating Yak Guru 357 Posts Posted-05/03/2009: 06:54:36 u can write the CLOSE, DEALLOCATE stmts in Catch block also, check thisBEGIN TRY DECLARE Cur CURSOR FAST_FORWARD FOR SELECT DISTINCT ID FROM Staff OPEN Cur FETCH NEXT FROM Cur INTO @Id WHILE (@@FETCH_STATUS = 0) BEGIN -- processing.. print 'LOOP' SELECT @ID * 'A' FETCH NEXT FROM Cur INTO @Id END SELECT Cursor_Status('global', 'Cur') AS 'Cur1' CLOSE Cur DEALLOCATE Cur END TRY BEGIN CATCH SELECT Cursor_Status('global', 'Cur') AS 'Cur2' CLOSE Cur DEALLOCATE Cur PRINT ERROR_MESSAGE() SELECT Cursor_Status('global', 'Cur') AS 'Cur2' END CATCHIf any error occurs then CURSOR is closed in Catch block."There is only one difference between a dream and an aim. A dream requires soundless sleep to see, whereas an aim requires sleepless efforts to achieve..!!" Topic Reply to Topic Printer Friendly Jump To: Select Forum General SQL Server Forums New to SQL Server Programming New to SQL Server Administration Script Library Data Corruption Issues Database Design and Application Architecture SQL Server 2012 Forums Transact-SQL (2012) SQL Server Administration (2012) SSIS and Import/Export (2012) Analysis Server and Reporting Services (2012) Replication (2012) Availability Groups and DR (2012) Other SQL Server 2012 Topics SQL Server 2008 Forums Transact-SQL (2008) SQL Server Administration (2008) SSIS and Import/Export (2008) High Availability (2008) Replication (2008) Analysis Server and Reporting Services (2008) Other SQL Ser