swan_sgp


Hi All,

I created a package which runs everydays and dumps the data into an excel file.

The problem iam facing is that -today the package runs and fills in the excel file,tomorrow it again runs and fills in the data without deleting the previous records.......

But i want it to delete the records already present and fill in the excel only with the new records...

Any help is greatly appreciated.

Thanks in Advance,

SVGP




Re: Overwriting an excel file using SSIS

Jay


Can you simply insert into a new file everyday that is datetime stamped then overwrite the apropriate one through a script task If you keep the paths in variable names you can chose to delete or keep the timestamped files. This may require you to delay validation, but I believe I've found ways around that though.

Or you could delete and re-create the file everyday. You may also have to tweak the package validation.






Re: Overwriting an excel file using SSIS

Rafael Salas

You can create the excel file on every execution. You can create a different file each time by adding a unique identifier to the file name; or you can use the same name every time; but then you have to have an additional step to delete/move the existing file

See if this post helps you:

http://rafael-salas.blogspot.com/2006/12/import-header-line-tables-_116683388696570741.html







Re: Overwriting an excel file using SSIS

desibull

I have found Excel destinations a bit tricky to work with. I had a similar issue wherein each day I wanted to created a different file with the previous day's date appended to the file name. When I tried to execute the package however it would give me an error stating that the file did not exist. I have assumed that for Excel destinations SSIS requires the file to already exist prior to execution. Anyway, this is how I solved the issue.

First, I realized that Flat File destinations are a little more forgiving and a bit more flexible. I therefore chose to output the data in a comma-delimited format csv file. Because csv files open well in Excel I did not have any problem. The other advantage with Flat File destinations is that you can overwrite them.

If using a Flat File is not an option what you can do is to have a "template" Excel file that is always empty and has a different name than the one being populated by your package. Once your package is done populating the target use the File System Task to make a copy of the target file, renaming in the process. Use another File System Task to then copy the template file to the target file area and overwrite the target. You now have a fresh empty target to start with and your previous target has already been saved.

I hope this makes sense.





Re: Overwriting an excel file using SSIS

desibull

OK, I just realiazed why I had to abandon the Excel method. Even when the SSIS package was presented with a new empty target it remembers how many rows were inserted from the previous run and consequently begins a fresh "append" at the n+1 th row in the new spreadsheet. In other words, if SSIS had inserted 50 records the previous day it begins the next day's insert at the 51st record even if the target is empty.

I wonder if there is a buffer that SSIS maintains and if there is a way to clear it.

I am now using a Flat File destination and it is working great. It is a really good alternative to using Excel destinations.





Re: Overwriting an excel file using SSIS

Rafael Salas

SSIS 'does not remember' what was the last row number it inserted. Perhaps the way you removed the data from the existing file made SSIS to still 'see' those rows as been used.

If you use the technique I described in my blog, to create the excel file you won't have that problem.






Re: Overwriting an excel file using SSIS

swan_sgp

Hi Rafael,

I tried the way you mentioned in the blog but

Iam getting the following error,even after trying a lot iam unable to resolve this


Expression cannot be evaluated

The variable "user::excelFilename" was not found in the variable collection.The variable might not exist in the correct scope.

Attempt to parse the expression "@[user::excelFilename]" failed and returned error code 0xC00470A6.The expression cannot
be parsed.It might contain invalid elements or it might not be well-formed.There may also be an out of memory error.

i tried both with package scope and task scope both didnt work as the same error was coming.

Did you face the same issue when you followed this method

Any help on this is greatly aprreciated.

Thanks,

SVGP.





Re: Overwriting an excel file using SSIS

Rafael Salas

Please provide the expression you are using and the property name where are you trying to apply it to.






Re: Overwriting an excel file using SSIS

swan_sgp

Hi

I created a global variable "filename" and then in the property window of the variable i changed the evaluate as expression to 'true' then i wrote an expression in the same properties window like

"H:\\Sharedrive\\Reports\\NAR1+select CONVERT(Char(10),getdate(),101)+.xls"

then i took the connection manager properties and in the expression pane i gave excel file path and in the expression builder i gave @[user::filename] and iam getting the error that i wrote previously.

Please let me know if what iam doing is wrong.

Thanks,

SVGP





Re: Overwriting an excel file using SSIS

Rafael Salas

That expression even when is valid; it evaluate to something like:

H:\Sharedrive\Reports\NAR1+select CONVERT(Char(10),getdate(),101)+.xls

Which is not a valid path/file name.

You need to work out the expression untill you get the desired date format.






Re: Overwriting an excel file using SSIS

Rafael Salas

Thsi expression should work for you:

"H:\\Sharedrive\\Reports\\NAR1" + RIGHT("0" + (DT_WSTR,2)DAY(getdate()),2) + RIGHT("0" + (DT_WSTR,2)MONTH(GetDAte()),2) + RIGHT("0" + (DT_WSTR,4)YEAR(GetDAte()),4) + ".xls"






Re: Overwriting an excel file using SSIS

swan_sgp

Hi Rafael,

Thanks a lot for the code.

Your code is working but again iam getting this error.

' H:\sharedrive\Reports\NAR106092007.xls' is not a valid path.Make sure that the pathname is spelled correctly and that you are connected to the server on which the file resides.

Thanks,

SVGP





Re: Overwriting an excel file using SSIS

swan_sgp

Hi Rafael,

Kindly let me know if you come to know the cause of this error.

Thanks,

SVGP.





Re: Overwriting an excel file using SSIS

desibull

I do not think you can use the drive letter - you need to specify the name of the server with double backslashes - so you need \\\\server_name within quotes so that it will translate to \\server_name.





Re: Overwriting an excel file using SSIS

Rafael Salas

Swan,

the message is very explanatory. Is this path valid

H:\sharedrive\Reports\

or should it be:

H:\sharedrive\Reports\NAR\

If the right one is the second option; then you need to modify the expression to add an extra '\'

Also make sure that the user executing the package (are you using BIDS ) has access to that directory and it can create files.