Monday, August 29, 2011

Loading Multiple files...

Recently I came across a scenario where in i had to load multiple excel files into a database table in sql server.The excel files reside in a folder from where these files need to be loaded into a sql server table. At first i worked on the data flow task where i import one excel file into the table. The reason being i need to build out the connection string for the excel source. I dragged a Excel source to the data flow task editor and a OLE Db destination data source. I set the source folder and the file for the excel source and also choose the first row has column names option.

This sets the connection for the excel source like this:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Ramdas\SSIS\Sheet1.xls ;Extended Properties="EXCEL 8.0;HDR=YES";
Once the excel source is set, connect it to the destination and do the required mappings for the destination table. Test the data flow task to make sure the data from a single excel can be imported.

In the Control flow editor, create a string variable called sfilename of type string and set the value of this to the excel file with the path (In this example: "C:\Ramdas\SSIS\Sheet1.xls), make sure the scope of the variable is at the package level.

Drag an For Each Loop Container, make sure the data flow task is inside the container. Edit the For Each Loop Container, choose the ForEach file enumerator in the Collection window, choose the file path and choose the option Full qualified under retrieve file name. In the variables section choose the variable sFilename and set the index to 0.

In the Data Flow task editor, right click on the Excel Connection Manager,Choose Properties, within the properties choose Expressions. In the Expressions dropdown Choose connection string. In the expression editor window copy and paste the Connection String of Excel connection manager, replace the fully qualified name with the user defined variable. The expression should be like the following:
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + @[User::sFilename]+" ;Extended Properties=\"Excel 8.0;HDR=YES\";"

The backslash in this expression is critical since they are the escape characters. When the evaluate expression is clicked the following statement should appear:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Ramdas\SSIS\Sheet1.xls ;Extended Properties="Excel 8.0;HDR=YES";
Once the expression is tested, click ok.

Now going back to the Control Flow the ForEach Container can be executed and multiple files within the source folder would be loaded to the database. In order to make sure that multiple files are loaded one can create an other table in the sql server database and capture the value in the user defined variable into a table.

I would like to thank the author of the blog,Matthew Roche: http:\\

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