Cursors In Named Query

Nov 8, 2006

hi...

In DSV, i am creating a "named Query", can we use 'cursors' while creating a named query ???

Thanks in advance ..

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Want To Avoid Cursors ... Need Help With Query

Oct 30, 2006

Hi,

I have a customer who is using vba to pull a result set from an sql server stored procedure into excel. She wants a calculated column added to the result set that gives:
The number days (datediff) between the end date (autend_dte) on one row and the begin date (autbeg_dte) on the next row for each client (clt_num). The rows are to be ordered by client and begin date. The number should be associated with the second row used to calculate the date diff. The first row for each client will have a date diff of 0.

I could do this using a cursor in the stored procedure or a loop in the vba, but I would prefer to do it with the select, but I don't even know where to start.

See expected results below.


CREATE TABLE #testit (
clt_num int NOT NULL ,
autbeg_dte datetime NULL ,
autend_dte datetime NULL)

INSERT INTO #testit (clt_num, autbeg_dte, autend_dte)
SELECT 510, '2004-09-01 00:00:00.000', '2005-09-30 23:59:00.000' UNION ALL
SELECT 510, '2005-10-01 00:00:00.000', '2006-04-06 23:59:00.000' UNION ALL
SELECT 600, '2006-08-01 00:00:00.000', '2006-11-06 23:59:00.000' UNION ALL
SELECT 2529, '2006-01-13 00:00:00.000', '2006-04-11 23:59:00.000' UNION ALL
SELECT 2529, '2005-11-30 00:00:00.000', '2005-12-12 23:59:00.000' UNION ALL
SELECT 2602, '2006-03-29 00:00:00.000', '2006-05-02 23:59:00.000' UNION ALL
SELECT 2602, '2005-11-12 00:00:00.000', '2006-02-27 23:59:00.000' UNION ALL
SELECT 2602, '2006-05-26 00:00:00.000', '2006-06-12 23:59:00.000' UNION ALL
SELECT 2602, '2006-06-18 00:00:00.000', '2006-06-28 23:59:00.000'

SELECT * FROM #testit
order by clt_num,autbeg_dte

Expected result:

clt_numautbeg_dte autend_dte Days Diff
5102004-09-01 00:00:00.0002005-09-30 23:59:00.0000
5102005-10-01 00:00:00.0002006-04-06 23:59:00.0001
6002006-08-01 00:00:00.000 2006-11-06 23:59:00.000 0
25292005-11-30 00:00:00.0002005-12-12 23:59:00.0000
25292006-01-13 00:00:00.0002006-04-11 23:59:00.00044
26022005-11-12 00:00:00.0002006-02-27 23:59:00.0000
26022006-03-29 00:00:00.0002006-05-02 23:59:00.00030
26022006-05-26 00:00:00.0002006-06-12 23:59:00.00024
26022006-06-18 00:00:00.0002006-06-28 23:59:00.0006


Thanks,

Laurie

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Mar 31, 2008

TaskID PID task Milestone
83manasi task2
83manasi task3
83manasi task4


Above is the query of the result
I want to show this resultset horizontaly
for that I have to use the cursor such that
@M1=Where Milestone=1
@M2=Where Milestone=2
@M3=Where Milestone=3
and putting this into a temp table with its projectid and taskid.
Plz guide me that how to achiev this exactly
Swati

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Oct 3, 2006

Hi all.



I am stuck in a bit of a conundrum for quite a while now, and I hope someone here will help me figure this one out.



So, first things first: let me explain what I need to do. I am
designing a web application that will allow users to consult info
available in a SQL2000 database. The user will enter the search
criterea, and hopefully the web page will show matching results.



The problem is the results shown aren't available per se in the DB, I
need to process the data a bit. I decided to do so on the SQL Server
side, though the use of cursors. So, when a user defines his search
criteria, I run a stored procedure that begins by building a dynamic
sql query and creating a cursor for it. I used a global cursor in order
to do so. It looked something like this:



SET @sqlQuery = ... (build the dinamic sql query)

SET @cursorQuery = 'DECLARE myCursor CURSOR GLOBAL FAST_FORWARD FOR ' + @sqlQuery

EXEC @cursorQuery

OPEN myCursor

FETCH NEXT FROM myCursor INTO ...

CLOSE myCursor

DEALLOCATE myCursor



This works fine, if there's only one instance of the
stored procedure running at a time. Should another user connect to the
site and run a search while someone's at it, it'll fail due to the
atempt to create a cursor with the same name.



My first thought was to make the cursor name unique, which led me to:

...

SET @cursorName = 'myCursor' + @uniqueUserID

SET @cursorQuery = 'DECLARE '+ @cursorName + 'CURSOR FAST_FORWARD FOR ' + @sqlQuery

EXEC @cursorQuery

...



The problem with this is that I can't do a FETCH NEXT FROM @cursorName since
@cursorName is a char variable holding the cursor name, and not a
cursor variable. So to enforce this unique name method the only option
I have is to keep creating dynamic sql queries and exucting them. And
this makes the sp a bitch to develop and maintain, and I'm guessing it
doesn't make it very performant.



So I moved on to my second idea: local cursor variables. The problem with
this is that if I create a local cursor variable by executing a dynamic
query, I can't extract it from the EXEC (or sp_executesql) context, as
it offers no output variable.


I guess my concrete questions are:


Is it possible to execute a dynamic sql query and extract a (cursor) variable from it?Is it possible to populate a local cursor variable with a global cursor, by providing the global cursor's name?Can I create a local cursor variable for a dynamic sql query? How?



Anybody sees another way arround this?Thanks in advance,

Carlos

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Hello,

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Sincerely,

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is this the best way to do it?

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Hi,
Te following situtation is :

ReportModel is created ,there is only a named query in DSV ,it has a few tables in it(The relationship are inner joins and outer joins).

The question is how could I create a unique logical primary key to identify each unique row in the named query dataset, and also you cannt generate a model unless the named query has a logical primary key . how can I solve this problem,any help?


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Jul 16, 2006

Hello,
Can anyone direct me a good article that is about why we should try avoiding using cursors and what are the alternatives?

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can we call cursors from asp.net as we can call stored procedures from asp.net.
 

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Jan 7, 2005

Hi,

I'm writting a stored procedure to insert new rows into a table, but I need to loop through an exsiting table and create a new record for every row in the old table. So I think what I'm needing to use is a cursor, but I've never worked with cursors before, and I just want to check that I have the right idea on what they are used for and if what I have so far looks ok.

This what I have so far, the StoreFees table only has 5 rows:


DECLARE @StoreFee as smallmoney
DECLARE @StoreLineID as int

DECLARE MyStoreFees CURSOR
FORWARD_ONLY
FOR
SELECT LineId, StoreFee FROM StoreFees ORDER BY StoreFee

OPEN MyStoreFees

FETCH NEXT FROM MyStoreFees
INTO @StoreLineId, @StoreFee

--Do my Inserts into other tables
INSERT INTO OtherTable (...,...,.., @StoreFee)
...
...
-- Done working with that row

CLOSE MyStoreFees

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Feb 28, 2005

I am trying to pull the data via fetching rows into a variable.

Begin
Fetch Next Into @temp...
Select @MainVariable = @MainVariable + @temp < @temp doesn't refresh with next fetch)

Print @temp < this works fine and returns the value for each fetch

End


I can print @temp and the data returns fine, but when I try to cancantenate with the above select, it doesn't refresh @temp wit the column in the table.

Any ideas?

DotNetNow

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Jun 19, 2001

I have two procedures. One works well, and the other has a small glitch I cannot figure out. I have placed >>>> at the place where the problem is occuring.

The first procedure, which is working great, is applying a stored procedure to many servers (remote procedure call), but is also polling the local server via a linked server connection. This way, all servers are polled equally.

The second procedure is actually using a SELECT statment to query a system table. This procedure works well on all servers except the local one. I get this error message:
Server: Msg 3910, Level 16, State 1, Line 1
Transaction context in use by another session.
[OLE/DB provider returned message: Unspecified error]

There seems to be a connection issue. Can someone help me work around this?

Thank you,

Neal


FIRST PROCEDURE (this one works perfectly):
truncate table dbidname
CREATE TABLE ##dbtemp ( dbname VarChar(50),
dbsize varchar (25),
dbownervarchar(50),
dbid smallint,
createdate datetime,
statusvarchar(75) )
declare@servernamevarchar(50)
declare dbupdate cursor
global
for
select servername from sqlservers where status = 'a'
open dbupdate
fetch next from dbupdate into @servername
while @@fetch_status = 0
begin
print @servername
EXEC sp_addlinkedserver @servername, 'SQL Server'
>>>INSERT INTO ##dbtemp
>>>exec (@servername + '.master..sp_helpdb')
alter table dbidname alter column sqlservers_id int null
insert into dbidname (dbsystemid, dbname)
select dbid, dbname from ##dbtemp
update dbidname set sqlservers_id = sqlservers.sqlservers_id from sqlservers where @servername = sqlservers.servername and
dbidname.sqlservers_id is null
update dbidname set whenupdate = getdate()
alter table dbidname alter column sqlservers_id int not null
exec sp_dropserver @servername
delete ##dbtemp
fetch next from dbupdate into @servername
end
close dbupdate
deallocate dbupdate
drop table ##dbtemp
exec spal_db_files_update


SECOND PROCEDURE (see >>>> to note problem area):
truncate table dbidname
CREATE TABLE ##dbtemp ( dbname VarChar(50),
dbsize varchar (25),
dbownervarchar(50),
dbid smallint,
createdate datetime,
statusvarchar(75) )
declare@servernamevarchar(50)
declare dbupdate cursor
global
for
select servername from sqlservers where status = 'a'
open dbupdate
fetch next from dbupdate into @servername
while @@fetch_status = 0
begin
print @servername
EXEC sp_addlinkedserver @servername, 'SQL Server'
>>>>INSERT INTO ##dbtemp
>>>>exec (@servername + '.master..sp_helpdb')
alter table dbidname alter column sqlservers_id int null
insert into dbidname (dbsystemid, dbname)
select dbid, dbname from ##dbtemp
update dbidname set sqlservers_id = sqlservers.sqlservers_id from sqlservers where @servername = sqlservers.servername and
dbidname.sqlservers_id is null
update dbidname set whenupdate = getdate()
alter table dbidname alter column sqlservers_id int not null
exec sp_dropserver @servername
delete ##dbtemp
fetch next from dbupdate into @servername
end
close dbupdate
deallocate dbupdate
drop table ##dbtemp

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I am receiving this error when running my cursor:

Error Messages...
Server: Msg 16933, Level 16, State 1, Line 0
The cursor does not include the table being modified.
The statement has been terminated.
Server: Msg 16933, Level 16, State 1, Line 5 (this message repeats)...
The cursor does not include the table being modified.
The statement has been terminated.

query:

declare cursor_test CURSOR for
select emp_ssn, effective_date1 from temp_employee_benefit_load
open cursor_test
declare @ssn char(9), @process_date char(8)
fetch next from cursor_test into @ssn, @process_date
while (@@fetch_status=0)
update test_cursor
set ssn = @ssn, process_date = @process_date
where current of cursor_test
fetch next from cursor_test into @ssn, @process_date

close cursor_test
deallocate cursor_test


Any help is appreciated:

Thanks,

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Sep 7, 2000

I have stored procedure in that I am using a cursor to fetch the row by row.
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He needed.

Ranch

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Apr 14, 2000

Please help resolve a problem (and debate!).

We have an app using VB with Access as the front end to SQL. SQL statments were built and sent
directly to the server obtaining set-oriented results. Response was fair.

We have a new app developed by an "expert" using VB & Interdev that was to be ported for use on
the internet. The app was designed using the same logic to build the SQL statements, but it is also
using cursors to retrieve all data. RESPONSE IS TERRIBLE!
The designer says that to access SQL over the Web, cursor use is a MUST!
True? Not True?
If true, and I am stuck with an app using cursors, any basic suggestions on where to look to improve
response time?

Thanks for any input.
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Hi,

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I first would query the data to return all rows where the value of R08SegmentValue= Null. Then I move through the resultset changing the value of the field R08Segments.

***********************Start of VB Code****************
'Set initial value for sTReportHeaderIdx
With rs1
sTReportHeaderIdx = !ReportIdx & !HeaderIdx
sPReportHeaderIdx = sTReportHeaderIdx
End With

bCount = 1

'loop through rs and when streportheaderidx changes reset bCount to 1
'otherwise increment bcount by 1 and write to field R08SegmentValue
Do While rs1.EOF = False And blnContinue = True
DoEvents
Do While sPReportHeaderIdx = sTReportHeaderIdx
With rs1
.Edit
!R08SegmentValue = bCount
.Update
bCount = bCount + 1
sPReportHeaderIdx = sTReportHeaderIdx
.MoveNext
If Not rs1.EOF Then sTReportHeaderIdx = !ReportIdx & !HeaderIdx
End With
Loop
sPReportHeaderIdx = sTReportHeaderIdx
bCount = 1
Loop

In the end my data should look like

ReportIdx HeaderIdx R08SegmentValue
1 1 1
1 1 2
2 1 1
2 1 2
2 1 3
3 1 1
3 1 2
3 1 3
1 2 1
1 2 2
1 2 3
etc..


Can this be done via an sp? How would I go about writing something like this?

Thanks in advance...any assistance you could provide would be appreciated!

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I hope someone can help me with this, as BOL didn't get me the answer I am looking for.

I want to write an update step that will transform the following:

1 abc
1 def
2 lmn
3 rst
4 tuv
4 xyz
4 jkl
5 pqr

into this:

1 abc,def
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Thanks in advance!
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Hi
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I suspect there is significant room for optimization here. Some of my ideas:

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- Try a dynamic cursor instead of a READ ONLY cursor.
- Dump new elements to a separate table or a file and then do a single large INSERT.

Anyone else think any of these ideas will work? Can anyone think of something better?

BTW, I've tried to replaced the procedural cursor code with set based UPDATES/INSERTS but the short version of the story is that that route just didn't pan out. I know that is very common optimization advice.

I've made minor simplifications to the code:
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DECLARE [TM #] CURSOR
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Jan 14, 2005

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vs

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I am quite novice in my abilities and I am completely stumped on how to get around using them.

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declare BadRecords cursor dynamic for select lngZipCodeID
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/* this is the syntax in Sybase
open BadRecords;
BadRecordsLoop: loop
fetch next BadRecords into BadID;
if sqlstate<>0 then
leave BadRecordsLoop
end if
*/

I have to convert it to sql , I m just checking whether my syntax is correct or not

open BadRecords
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begin
set @BadId = fetch next BadRecords
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end


I have doubt in my syntax. Can you help me out in this?


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I have a requirement to check a value which MUST be unique forever even if it is removed and readded.I have created a seperate table to maintain this value.

Without using a cursor how would I be able to append a duplicate base value (i.e. smith.j@here.now) with the next sequential value (i.e. smith.j02@here.now)

Any takers?

Oh ya, These values are not manually entered but populated through a DTS script. The existing values are repopulated from historic tables and new entries are added automatically. Initially the values would be populated without a number but a number needs to be generated on duplicates.

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Thanks



If it is that easy, everybody will be doing it

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Can someone tell me what is wrong with this code?
I just want to get the account_number field from the accounts table and put it in the results table. Let me clarify, there are over 500 rows in the accounts table and I want to loop through those while setting the accounts.account_number = results.account_number.

declare @account nvarchar

DECLARE Accounts_Cursor CURSOR FOR
SELECT account_number FROM accounts
OPEN accounts_Cursor
FETCH NEXT FROM accounts_Cursor into @account
WHILE @@FETCH_STATUS = 0
BEGIN
update results
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FETCH NEXT FROM accounts_Cursor into @account
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