Determining If A Local Variable Exists
Jun 11, 2007
Is there a way to determine if a local variable exists or not?
There's a parameter I often use in code called @guid_batch that is usually declared in the parameter of a stored proc, but when in debugging it would be nice to have it available without having to change code.
Is there something that I could do similar to the following
Code:
IF VARIABLE_ID('@guid_batch') IS NULL
BEGIN
DECLARE @guid_batch UNIQUEIDENTIFIER
SELECT @guid_batch = NEWID()
END
Thanks in advance,
-MBirchmeier
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May 2, 2000
How do I find out if a temporary table named '##test' exists? I have a stored
procedure that creates this table and if it exists another stored procedure
should do one thing, if it does not exist I want the SP to do something else.
Any help as to how I can determine if this table exists at the current time
would be greatly appreciated.
Thanks in advance for you help,
Jon
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Jul 20, 2005
Hello,I'm working with a number of databases. I need a way to determine if aforeign key with given name exists and determine what tables andfields are linked to it. Any ideas?I know I can issue the following statement to get a list of the fieldsthat are constrained by a foreign key constraint.SELECT * FROM INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGEHow can I get a list of fields pointed to by the constraints?Thanks,WillJoin Bytes!
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Jul 20, 2005
Hey,I'm writing some automated unit tests for a database app. The appcreates a database via script. I'm developing the system in atest-driven manner and need a way to determine if a parameter existswithin a stored procedure using SQL. Any ideas?Thanks,WillJoin Bytes!
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May 12, 2015
I am building as Search page whereby a user passes in a variable and depending on the variable type, different results will come back ...if the search criteria is '123 somewhere' it would be a string and we would search the address field. If the search criteria is '123' i want to search the address field as well as the id field.that being said, in TSQL is there a way to determine if the variable coming in is a string or an int?
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Mar 10, 2008
It is possible for global temporary tables, but for local, it is said that the names(in the tempdb) change each time the table is created, so i am not sure if there is a way to check it.
Thanks
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Feb 28, 2008
Hello,
I would like to set a variable within my if exists statement, however SQL is throwing and error stating:
Incorrect syntax near '='.
If I remove the if exists, the query runs fine. Is there a reason why this is not working the way I have it and what suggestions can I use to accomplish what I am trying to do, which is store the ID into the permissionID variable
Here is my code block:
Code Snippet
declare @permissionID int;
if exists(select @permissionID = Id from Permission
where [Description] = 'SettlementReport')
Thanks,
Flea#
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Jul 20, 2005
Hi allIn the SP below im (trying to) do some dynamic sql. As you can see the tableto use is set as a variable and the 'exec' method used to run thesqlstatements.My problem is that the 'if exists' method is not doing what i was hoping itcould do.The @presql command returns somewhere between 0 or 50 rows (give and take) -i just want the 'if exists' part to determine if the select statementreturns something or not since i then will have to update a current row - orinsert a new one.Even if there is no rows returned, the 'if exists' command will return true:-/Any suggestions to a different way of approach...?Thanks in advance :-)######## Stored procedure start ########[various @ variables]....declare @presql varchar(200)select @presql = 'SELECT * FROM '+@CurrentDB+' where btsiteID='+cast(@SiteID as varchar(6))+''IF exists((@presql))BEGINdeclare @UpdateSQL varchar(400)set @UpdateSQL = 'UPDATE '+@CurrentDB+' SET btDate='''+cast(@FileDate asvarchar(12))+''''exec(@UpdateSQL)ENDELSEBEGINdeclare @InsertSQL varchar(2000)select @InsertSQL = 'INSERT INTO ' + @CurrentDB + '(btDate,btTime)VALUES('''+ cast(@FileDate as varchar(12)) + ''','+ cast(@ImportTime as varchar(6)) + ')'EXEC(@InsertSQL)END######## Stored procedure end ########
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Feb 18, 2006
hi. i'm building a news section for some friends of mine. i list all the news items on the main page in a gridview. i've made a custom edit linkbutton that sends the user to an edit page, passing the news id as a quarystring variable. on the edit page i first check if the querystring variable contains an id at all. if not, i redirect the user to the main page. if an id is passed with the querystring, i fetch the matching news item from the database and place it in a formview control for editing.so far, so good. but what if someone types a random id in the querystring? then the formview won't show up and i'd look like a fool. :) therefore, i need some kind of check to see if the id exists in the database. if not redirect the user back to the main page... so i started thinking: i could check the databsae in a page_load procedure. if all is well, then display the news item. since the formview is automatically filled with the correct data, does that mean that i call the database two times? i mean, one for checking if the news item exists, and one for filling the formview. logically, this would be a waste of resources.help is appreciated.
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May 27, 2004
I am trying to create a procedure or function that will deal with weekly information for staff records.
Rather than declaring 14 local variables for the information, is it possible to declare a local variable as an array? Sorry for using VB terminology - not sure how SQL would describe it.
TIA
Fatherjack
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Dec 19, 2001
Hello everybody,
Here I have two tables. Let's call them A and B.
A contains the folowing data: (address of persons)
PostCode Street Number CdeTour
-------- ------ ------ -------
31000 Well. 0025 NULL
31000 Well. 0050 NULL
31000 Wash. 0010 NULL
B contains the folowing data:
PostCode Street FirstEven LastEven FirstOdd LastOdd CdeTour
-------- ------ --------- -------- -------- ------- -------
31000 Well. 0002 0040 0043 0073 100
31000 Well. 0042 0084 0001 0041 200
31000 Wash. 0002 0050 0001 0049 100
* My problem is that I want to update the field A.CdeTour depending on the data present in B.
Let's take the first line from the table A: the number of the street 'well.' is '25', and '25' is odd and between '1' and '41' which meens that I should update my field A.CdeTour should be set to '100' (B.CdeTour).
Let's take another example, so in the second line: the street is still 'well.' but here the number is '50'. '50' is even and between '42' and '84' so the field A.CdeTour should be set to '200' (B.CdeTour).
Here I wrote a query, which doesn't work properly:
DECLARE @Num VARCHAR(4)
UPDATE A
SET @Num = Number, CodeTournee=
CASE WHEN @Num % 2 = 0 THEN(
-- even number of street
SELECT CdeTour
FROM B
WHERE @Num BETWEEN FirstEven AND LastEven
AND A.PostCode = B.PostCode
AND A.Street = B.Street
)ELSE(
-- odd number of street
SELECT CdeTour
FROM B
WHERE @Num BETWEEN FirstOdd AND LastOdd
AND A.PostCode = B.PostCode
AND A.Street = B.Street
)END
FROM A, B
The query runs but the problem is that it doesn't update the field, because it doesn't interpret @num by its value.
In fact, if instead of @num, I hard-code a value it works
... WHERE '0025' BETWEEN FirstOdd AND LastOdd ...
Can someone help me???? I would be very pleased, if someones could give me another way of doing it or a trick in order to avoid this problem.
Thanks in advance.
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Jun 28, 2004
I execute the following in my Query Analyzer:
Declare @Test varchar(8000)
Set @Test='SELECT VIOXX_LastName + '' + VIOXX_FirstName + '' + CONVERT(varchar(50), VIOXX_Number) AS PlaintiffsName, VIOXX_Number
FROM tblPlaintiff WHERE VIOXX_Number NOT IN(SELECT VIOXX_Number FROM tblCase_Plaintiff) OR
VIOXX_Number IN (SELECT tblCase_Plaintiff.VIOXX_Number FROM tblCase INNER JOIN tblCase_Plaintiff ON tblCase.Case_Number = tblCase_Plaintiff.Case_Number
WHERE (tblCase.Status = ''InActive'')) ORDER BY VIOXX_Number, VIOXX_LastName'
Select @Test
and get the following result:
SELECT VIOXX_LastName + ' + VIOXX_FirstName + ' + CONVERT(varchar(50), VIOXX_Number) AS PlaintiffsName, VIOXX_Number
FROM tblPlaintiff WHERE VIOXX_Number NOT IN(SELECT VIOXX_Number FROM tblCase_Plaintiff) OR
VIOXX_Number IN (SELECT
the latter part of my original text is not stored in the variable. Is there some limitation on the number of characters for a local variable in transact sql?
Any ideas? Thanks in advance.
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Jan 17, 2007
Hi All,
How to declare TEXT datatype as local variable . My data is getting truncated as it cross varchar(8000) characters.
Saju
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Dec 17, 2007
Hi guys I am sitting and testing som variants of this simple SP, and I have an question that I couldent answer with google or any thread in this forum.
Perhaps I am doing something really easy completly wrong here.
Why does the local variables in the first code segment slow down the overall execution of the procedure?
Dont mind the logic why I have them there are only testing som things out.
If i declare two variables the same way:
DECLARE @v INT
SET @v = 100
When I use it in a WHERE CLAUSE:
...WHERE [V] BETWEEN @v AND @x)
Is there any different then
...WHERE [V] BETWEEN 100 AND 200)
Cant figure this out, why does it hurt the performance so bad? As a C# guy its the same thing ?
Thanks in advance
/Johan
Slow
ALTER PROCEDURE [dbo].[spStudio_Get_Cdr]
@beginDate DATETIME = null,
@endDate DATETIME = null,
@beginTime INT,
@endTime INT,
@subscribers VARCHAR(MAX),
@exchanges VARCHAR(MAX) = '1:',
@beginDateValue int,
@endDateValue int
AS
BEGIN
SET NOCOUNT ON;
DECLARE @s INT
SET @s = @beginDateValue
DECLARE @e INT
SET @e = @endDateValue
print @s
print @e
DECLARE @exch TABLE(Item Varchar(50))
INSERT INTO @exch
SELECT Item FROM [SplitDelimitedVarChar] (@exchanges, '|') ORDER BY Item
DECLARE @subs TABLE(Item Varchar(19))
INSERT INTO @subs
SELECT Item FROM [SplitDelimitedVarChar] (@subscribers, '|') ORDER BY Item
SELECT [id]
,[Abandon]
,[Bcap]
,[BlId]
,[CallChg]
,[CallIdentifier]
,[ChgInfo]
,[ClId]
,[CustNo]
,[Digits]
,[DigitType]
,[Dnis1]
,[Dnis2]
,[Duration]
,[FgDani]
,[HoundredHourDuration]
,[Name]
,[NameId]
,[Npi]
,[OrigAuxId]
,[OrigId]
,[OrigMin]
,[Origten0]
,[RecNo]
,[RecType]
,[Redir]
,[TerId]
,[TermAuxId]
,[TermMin]
,[Termten0]
,[Timestamp]
,[Ton]
,[Tta]
,[Twt]
,[Level]
FROM
[dbo].[Cdr] AS C
WHERE
(C.[DateValue] BETWEEN @s AND @e)
AND
(C.[TimeValue] BETWEEN @beginTime AND @endTime)
AND
EXISTS(SELECT [Item] FROM @exch WHERE [Item] = C.[Level])
AND
(EXISTS(SELECT [Item] FROM @subs WHERE [Item] = C.[OrigId] OR [Item] = C.[TerId]))
END
Fast
ALTER PROCEDURE [dbo].[spStudio_Get_Cdr]
@beginDate DATETIME = null,
@endDate DATETIME = null,
@beginTime INT,
@endTime INT,
@subscribers VARCHAR(MAX),
@exchanges VARCHAR(MAX) = '1:',
@beginDateValue int,
@endDateValue int
AS
BEGIN
SET NOCOUNT ON;
DECLARE @exch TABLE(Item Varchar(50))
INSERT INTO @exch
SELECT Item FROM [SplitDelimitedVarChar] (@exchanges, '|') ORDER BY Item
DECLARE @subs TABLE(Item Varchar(19))
INSERT INTO @subs
SELECT Item FROM [SplitDelimitedVarChar] (@subscribers, '|') ORDER BY Item
SELECT [id]
,[Abandon]
,[Bcap]
,[BlId]
,[CallChg]
,[CallIdentifier]
,[ChgInfo]
,[ClId]
,[CustNo]
,[Digits]
,[DigitType]
,[Dnis1]
,[Dnis2]
,[Duration]
,[FgDani]
,[HoundredHourDuration]
,[Name]
,[NameId]
,[Npi]
,[OrigAuxId]
,[OrigId]
,[OrigMin]
,[Origten0]
,[RecNo]
,[RecType]
,[Redir]
,[TerId]
,[TermAuxId]
,[TermMin]
,[Termten0]
,[Timestamp]
,[Ton]
,[Tta]
,[Twt]
,[Level]
FROM
[dbo].[Cdr] AS C
WHERE
(C.[DateValue] BETWEEN @beginDateValue AND @endDateValue)
AND
(C.[TimeValue] BETWEEN @beginTime AND @endTime)
AND
EXISTS(SELECT [Item] FROM @exch WHERE [Item] = C.[Level])
AND
(EXISTS(SELECT [Item] FROM @subs WHERE [Item] = C.[OrigId] OR [Item] = C.[TerId]))
END
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Feb 24, 2015
declare @filename varchar(255),
@path varchar(255),
@sql varchar(8000),
@sql3 varchar(8000),
[Code].....
i need to set a Apostrophe in front of dir and at the end
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Jun 17, 2008
Hi guys,
I have a cursor that loops over a table and I use a local variable to append the column data. However when I try to print this variable, it comes as empty!
The code is
declare @testVar varchar(max)
<cursor loop begins>
set @testVar = @testVar + ',' + @SomeColName
<cursor loop ends>
print 'Value: ' + @testVar
I can't understand why the @testVar is empty, since the @SomeColName has a value in every iteration.
Thanks!
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Dec 15, 2006
Is there an expression syntax for putting a local variable value into a text box like there is for putting a parameter value? I'm using the report builder via VS
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Mar 12, 2003
I've created a stored procedure that converts an input string in richtext format (input as type TEXT) to plain text. I would like to be able to return this newly converted string, but I need to have some way of storing it in a local variable. My problem is that since I can't use the TEXT datatype as a local variable, I have no way of storing the large amounts of text I converted within the procedure. The VARCHAR(8000) just isn't large enough for my purposes. Anyone have any suggestions on how to go about doing this?
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Mar 22, 1999
I'm trying to have an identity column seed value specified with a local variable value as follows, however it
doesn't allow me to do it (Says cannot use a variable name for a seed value).
Any ideas or suggestions?
DECLARE @idvalue int
SELECT @idvalue = max(accountid) + 1
FROM account
CREATE TABLE accounttemp
(Accountid int IDENTITY(@idvalue,1),
name char(10),
address char(10))
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Oct 7, 2007
Hi all
Imagine we have a table as follow:
Create Table Test(
Pkey int not Null identity Primary Key,
Name varchar(20) not null,
Famil varchar(30) not null
)
now is there anyway to Run following Script:
declare @FLDName varchar(10)
set @FLDName='Name'
Select @FLDName from Test
in the other hand is there anyway to use Local variables in a SELECT statements as above?
to tell you the truth , what really motivated me to do this , was being able to declare a User-Defined-Function and passing some fields as an String and then use them in a SELECT statement or any other T-Sql codes!!!
Could anyone help me.?
Kind Regards.
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Jul 23, 2005
I am new at sql so would appreciate some helpI have the name of a table in alocal variable is it possible to select thistableDECLARE @name sysnameSET @name = 'tblSniffedItems'PRINT @nameSELECT * FROM @nameI expected this wo work but I got the following error.@name is declare as far as I knowServer messageMust declare the variable '@name'.Thanks in advanceAndre
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Mar 16, 2007
Changed stored procedure
[dbo].[spLogonName @pNewLogonName varchar(60) AS
SELECT * FROM .dbo.tblUser Where vcLogonName = @pNewLogonName
to
[dbo].[spLogonName @pNewLogonName varchar(60) AS
DECLARE @Local_pNewLogonName varchar(60)
SET @Local_pNewLogonName = @pNewLogonName
SELECT * FROM .dbo.tblUser Where vcLogonName = @Local_pNewLogonName
and started getting this error on the web page.
ADODB.Recordset error '800a0cb3'
Current Recordset does not support updating. This may be a limitation of the provider, or of the selected locktype.
Does anyone know why this is happening? Nothing on the site has changed. If I change the sp back the errors go away. I'm trying to use local variables in all SP to avoid the slowness that can happen when using the parameter varibles.
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Feb 29, 2008
Hi,
I€™ve got the following statement :
SELECT TOP(1) Date, Status FROM TABLE1 WHERE TEC_STATUS = 1 ORDER BY DATE DESC
I want to retrieve the status field to a variable, but I€™m not being able to do so€¦ I think its due to the TOP function€¦
I have tried those with no success:
SELECT @var2 = TOP(1) [Date], @var = [ Status] FROM TABLE1 WHERE TEC_STATUS = 1 ORDER BY DATE DESC
SELECT @var2 = [TOP(1) Date], @var = [ Status] FROM TABLE1 WHERE TEC_STATUS = 1 ORDER BY DATE DESC
Is there Any way I can do that ?
Thanks
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Feb 25, 2008
hi,
i'm fairly new to visual studio and have a select statment which is displayed fine in my report, i have headings however of which one i'd like as a variable that i've declared and set
declare @MyVariable varchar(6)
set @MyVariable = "abcdef"
i know how to display a field in a cell like follows:
=Fields!Code.Value
or a parameter like follows:
=Parameters!month.Value
but how do i display my local variable called @MyVariable?
thanks in advance.. I've searched but can't find out how to do this and it's probably really obvious!!
kev
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Oct 11, 2006
Hi,
I'm trying to put the results from a SQL query that returns only one filed but one or more rows into a local variable in a comma separated format.
Any help is appreciated.
Thanks.
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Nov 2, 2006
Can someone show how to do this?I have a SqlDataSource1, and i have a SELECT * FROM Table1How would i get@ProdName@ProdNumber Into the following local variablesString ProductNameInt ProductNumber I’m using C# and ASP 2.0 VWDThanks for Help1
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Feb 10, 2000
Hi All,
I need to store the row count from two different servers (one 6.5 and one 7.0)
to compare by doing this:(in T-SQL)
declare @kount1 int, @kount2 int
exec master..xp_cmdshell 'isql -Sserver65 -d dbA -T -Q "select count(*) from tableA",no_output
exec master..xp_cmdshell 'isql -Sserver70 -d dbA -T -Q "select count(*) from tableA",no_output
How can I save the rowcount in @kount1, @kount2 respectively for comparison?
Appreciate your feedback.
David Nguyen
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May 23, 2001
In a stored proc, can you declare a local variable that is an existing column in a table & then based on other criteria, do an order by using the local variable?
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Mar 7, 2006
Hi Guys,
i'm batttling with the below Trigger creation
__________________________________________________ _
CREATE TRIGGER dbo.Fochini_Insert ON dbo.FochiniTable AFTER INSERT AS
BEGIN
DECLARE @v_object_key VARCHAR(80)
DECLARE @v_object_name VARCHAR(40)
DECLARE @v_object_verb VARCHAR(40)
DECLARE @v_datetime DATETIME
SELECT ins.Cust_Id INTO @v_object_key FROM inserted ins <--- my problem area!!
SET @v_object_name = 'FochiniTable'
SET @v_object_verb = 'Create'
SET @v_datetime = GETDATE()
IF ( USER <> 'webuser' )
INSERT INTO dbo.xworlds_events (connector_id, object_key, object_name, object_verb, event_priority, event_time, event_status, event_comment)
VALUES ('Fochini', @v_object_key, @v_object_name, @v_object_verb, '1', @v_datetime,'0', 'Triggered by Customer CREATE')
END
________________________________________________
i'm trying to get the INSERTED variable from table FochiniTable on colomn Cust_Id
and the statement: SELECT ins.Cust_Id INTO @v_object_key FROM inserted ins - is failing [still a newbie on mssql server 2000]
any help will be appreciated
lehare.
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Feb 10, 2004
Hi all,
I'm trying to be slick, but so far am just all wet *snicker*
I've got a table with rows that may or may not exist, and am trying to retrieve a column if an associate row DOES exist.
For argument's sake, my PIndex table looks like:
PID int
CreateDate smalldatetime
CloseID float
Here is my select logic that I thought would save an extra select to load my local variable if the row is actually in the table...
DECLARE @CloseID float
IF NOT EXISTS (SELECT @CloseID = CloseID
FROM PIndex
WHERE ((PID = '14') and
(CreateDate = '2004-02-06')))
SET @CloseID = 100
The SET afterwards is just to initialize the variable if it can't be had from an existing row in the table.
The trouble is, that it fails to compile with the following error:
>>>>> Line 3: Incorrect syntax near '='.
Any insights? My goal is to use a single select to load the value into my local variable if the associated row exists, or to set my local variable to 100 if it doesn't.
Thanks!
Paul
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May 25, 2004
Not wishing to derail the other recent thread on loading a local variable, I've posted this query (hee,hee,hee...I kill me) on a separate thread...though I think I am trying to do something similar...that is to build a dynamic select statement, but return a count of the rows it finds/doesn't find to a local variable...using the (amazingly timely) responses above, I tried this:
Note that the local variables @TargetDate and @TLevel are necessary because they are being passed into the procedure as variables....
DECLARE @SQLCmd varchar(256)
DECLARE @TargetDate smalldatetime
DECLARE @TLevel int
DECLARE @n int
SET @TargetDate = '2004-05-24'
SET @TLevel = 1
SET @SQLCmd = 'SELECT @n = count(*) FROM EventLog WHERE ((CONVERT(varchar(10), [Date], 101) = ''' +
CONVERT(varchar(10), @TargetDate, 101) + ''') AND (MsgLevel = ' +
CONVERT(varchar(3), @TLevel) + '))'
exec (@SQLCmd)
if @n > 0
print 'yep'
else print 'nope'
and, it's TRYING to work...but apparently the local variable @n is not recognized in the execution of the dynamic statement, as this is the output:
Server: Msg 137, Level 15, State 1, Line 1
Must declare the variable '@n'.
nope
Thoughts?
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Nov 12, 2013
I am trying to figure out a way to retrieve a field value and assign it to a local variable with out destroying the whole structure of my T-SQL statement.
Here is the code:
DECLARE @AVERAGE_WHOLESALE_PRICE VARCHAR(20)
DECLARE @ORDERBY VARCHAR(20)
SELECT TOP 1 @AVERAGE_WHOLESALE_PRICE = P.NPT_PRICEX,
CASE NPT_TYPE
WHEN '07' THEN 1
WHEN '09' THEN 2
[Code] ....
The error message is
Msg 141, Level 15, State 1, Line 3
A SELECT statement that assigns a value to a variable must not be combined with data-retrieval operations.
How to modify this statement?
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Aug 16, 2007
Hi All,
I need to select some collumn data , can i store it in a varable some how.
Select name from Names
how can i assign this value to a variable, I need to manipulate this column value based on few cases.
As always thanks and appreciate your help.
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