Setting A Variable In A For Loop

Jan 30, 2008



The For Loop will execute a stored procedure that passes a variable each time it loops. I need to set this variable, @FiscalWeek, equal to the variable @Counter. So the first time it loops, the counter will be 1, and the Fiscal Year would be set to 1. The next time it would be two, and so forth. Can I do this in the Expressions section of the For Loop? If so,
what would the property be?


InitExpression @Counter =0
EvalExpression @Counter == @CurFiscalWeek
AssignExpression @Counter = @Counter + 1

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Problem With Setting Variable Values In A Loop

Sep 11, 2007

In a stored procedure that I'm fixing, there is a problem with assigning variable values inside a loop. The proc is using dynamic SQL and if statements to build all these statements, but I'm having to add a new variable value to it that is throwing it out of whack.

This is the current structure:

SET @MktNbr = 10

WHILE @MktNbr < 90

BEGIN

DECLARE@sqlstmt varchar(1000)

SET @Market = '0' + CONVERT(char(2),@MktNbr)

SET @sqlstmt = 'SELECT (columns)
INTO dbo.table' + @Market + '
FROM #table
WHERE marketcode = ''' + @Market + '''
IF @MktNbr = 50
BEGIN
SET @MktNbr = 51
END
ELSE
IF @MktNbr = 51
BEGIN
SET @MktNbr = 52
END
ELSE
IF @MktNbr = 52
BEGIN
SET @MktNbr = 55
END
ELSE
IF @MktNbr = 55
BEGIN
SET @MktNbr = 60
END
ELSE
BEGIN
SET @MktNbr = @MktNbr + 10
END
EXEC (@sqlstmt)


END


I'm probably having a blonde moment, but I'm trying to replace the if statements with this:

SET @MktNbr =
CASE
WHEN @MktNbr = 10 THEN 20
WHEN @MktNbr = 20 THEN 30
WHEN @MktNbr = 30 THEN 40
WHEN @MktNbr = 40 THEN 50
WHEN @MktNbr = 50 THEN 51
WHEN @MktNbr = 51 THEN 52
WHEN @MktNbr = 52 THEN 55
WHEN @MktNbr = 55 THEN 60
WHEN @MktNbr = 60 THEN 70
WHEN @MktNbr = 70 THEN 80
WHEN @MktNbr = 80 THEN 81
ELSE @MktNbr END

Clearly it's wrong because the proc bombs every time with a duplicate table error.

It has been suggested to me that I should hold these market values in an external table. This sounds reasonable but I'm ashamed to admit that I don't know how I'd implement that. Can someone maybe give me a nudge in the right direction?

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Feb 22, 2008

Hello all,

I am running into an issue that seems to be collaborated here: http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=188886&SiteID=1.

To summarize, I have a Foreach Loop that uses a Foreach File Enumerator. The loop writes the file names to a variable which is used in the Expressions property for a flat file's ConnectionString. The flat file is used as a source destination in a Bulk Insert Task that is inside the Foreach Loop. The flat file's connection string is not picking up the file name, resulting in this error: "The specified connection "test.txt" is either not valid, or points to an invalid object. To continue, specify a valid connection."

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It does work if I replace the Bulk Insert Task with a Data Flow (flat file source -> ole db destination). It also works if I set the file's connection string manually in a script task.

It looks to me as though the Bulk Insert isn't calling whatever method in the connection manager that reevaluates the property expression. Am I missing something or is this a bug? I looked at the connect site, but couldn't find this particular scenario.

Thanks for any insight you might provide!
Jessica

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hi !

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Dear All,

I’m trying to collect values from a query into a single variable within a loop, like so:

WHILE condition is true
BEGIN

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For some reason though the @myString does not collect up the values, but will equal NULL at the end of the loop.

If however I simple do

WHILE condition is true
BEGIN

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END


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Can anyone explain why this might be?

Thanks in advance!

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As I understand it, if you declare a variable and then try to re-declare a variable of the same name an error is generated. If I do this inside a While loop this does not seem to be the case. What ever is assigned is kept and just added to (in the case of a table variable)

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BEGIN
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[Code] ....

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Hi All,

Seems like a simple task, but been a struggle.

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In my file task trying to join the two variables together in another variable, keep saying my path is wrong with the file task kicks off.

here's the syntaxt

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[code]....

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Code Block
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</Configuration>

The property in the DataFlow task is then set to: @BufferTempStoragePathValue.


When the package is executed, it logs the error message "The buffer manager cannot create a temporary storage file on any path in the BufferTempStoragePath property. There is an incorrect file name or no permission."

My question for the group is two-fold: 1) what am I doing wrong in the setup of the property/variable, and 2) what are the security permissions that are required for the (new) folder.

It's got to be something obvious, I just can't see what!

Many thanks for your assistance.

Cheers,
Mike

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Hi,

im using a Foreach ADO Enumerator in my SSIS Package, which iterate on a DataSet from a SQL Task.

I use the "Variable Mappings" on my Foreach Loop to retrieve the values into User-variables. But what i need is a way to combine a value from the DataSet with a User-variable and assign this new value to a new User-variable.

Anybody tried something like this?

Regards, Martin

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May 24, 2007

Hi,

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I want to modify that variable in such a way that if no value is set for that variable then use system date else use date in varaiable.



Can someone help me out in this.. I know it has something to do with the expression builder but donn know how to do it.



Cheers

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I have to import a number of excel spreadsheets. I'm using the classic Foreach Loop inside another Foreach loop approach. The outside loop (Foreach File Enumerator) cycles through the Excel files, while the inside loop (Foreach ADO.NET Schema Rowset Enumerator - ExcelSchema - Tables) to cycle through the individual Excel sheets in each file.

Nothing special there; however, for some reason these excel files have some "phantom" tabs that should not be imported. I call them phanton because they show up as an importable tab in a SSSIS import wizard but actually are not listed in the excel file structure (no, they are not hidden tabs, I checked).

My idea is to use a constraint to NOT import those phanton tabs. The name convention should allow me to do that because the normal tabs have the name 'AAAAAAyyyymmdd$' and the phantom tabs show up as 'AAAAAAyyyymmdd$'_xlnm#_FilterDatabase (the line below was captured from the Local Variable window and show one of the phantom tabs name).

+ User::WorksheetName {'AAAAAAyyyymmdd$'_xlnm#_FilterDatabase} String

I tried using Len (@[User::WorksheetName]) == 17, which corresponds to the length of the normal tabs name ('AAAAAAyyyymmdd$'). However, it does not work. For some reason the portion of the phantom tab name after the ending single quote (_xlnm#_FilterDatabase)  appears to be ignored.

I tested with a number of different expressions, including reversing the variable, to no avail. It seems that internally just the standard name between quotes is what the constraint sees.

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Apr 24, 2007

What I'm trying to do is this;

I have a table with Year , Account and Amount as fields. I want to



SELECT Year, Account, sum(Amount) AS Amt

FROM GLTable

WHERE Year <= varYear



varYear being a variable which is each year from a query



SELECT Distinct Year FROM GLTable



My thought was that I would need to pass a variable into a select statement which then would be used as the source in my Data Flow Task.



What I have done is to defined two variables as follows

Name: varYear (this will hold the year)

Scope: Package

Data type: String



Name:vSQL (This will hold a SQL statement using the varYear)

Scope: Package

Data type: String

Value: "SELECT Year, Account, sum(Amount) AS Amount FROM GLTable WHERE Year <=" + @[User::varYear]



I've created a SQL Task as follows

Result set: Full Result Set

Connection Type: OLE DB

SQL Statement: SELECT DISTINCT Year FROM GLTable

Result Name: 0

Variable Name: User::varYear



Next I created a For Each Loop container with the following parameters

Enumerator: Foreach ADO Enumerator

ADO Object source Variable: User::varYear

Enumeration Mode: Rows in First Table



I then created a Data Flow Task in the Foreach Loop Container and as the source used OLE DB Source as follows

Data Access Mode: SQL Command from Variable

Variable Name: User::varYear



However this returns a couple of errors "Statement(s) could not be prepared."

and "Incorrect syntax near '='.".



I'm not sure what is wrong or if this is the right way to accomplish what I am trying to do. I got this from another thread "Passing Variables" started 15 Nov 2005.



Any help would be most appreciated.

Regards,

Bill

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Hi:

I am trying to loop through 4 files in a folder and read the names of those files through the For each loop container task. I have 4 readme files (readme1.txt thru readme4.txt) in a folder called C:SSIS.

I have added a for each Loop container and a script task to my package. In the Variable Mapping page I have named the Variable and configured the index to be 0. The problem is when I execute the package the file name that is read is always readme1.txt. I want all the file names to be read under the folder ( in other words configure the index to be 0 thru 4). How do I configure the index so that it can read all the files?.

The following is the code I have in my script task:

Public Sub Main()

Dim variables As Variables

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Dts.VariableDispenser.LockOneforRead("FileName", variables)

End if

Msgbox ("Retrieved the File " & CStr(variables("FileName").Value))

Dts.TaskResult=Dts.Results.Success

End Sub

When I execute the package with the above code, I always see a message box popping up and saying Retrived File Readme1.txt.

I want the msgbox to pop up and say

Retrieved Readme1.txt

Retrieved Readme2.txt

Retrieved Readme3.txt and so forth...

Any help on achieving this is appreciated.

Thanks

AK











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