#0421 – SQL Server – SSIS – Wild card search to find if a file exists in a folder or directory


I recently answered a question on a forum which I believe will be useful to many of the readers in the audience.

SSIS packages are widely used for data import from and export to files. One of the main tasks in this situation would be to check if files with certain kinds of names exist in a particular folder or directory, i.e. basically perform a wild-card search in a directory.

The solution

This can be achieved by using the EnumerateFiles() method of the System.IO.Directory class in the SSIS Script task. Here’s the sample package:

In a folder, I have a set of files, some with similar names (which we will search from the SSIS package).

Files existing in the directory to be searched

The SSIS package has two (2) variables:

Variable NameConfiguration on the Script TaskDescription
SearchPathReadOnly, InputThis is the path to be searched
SearchPatternReadOnly, InputPattern to be searched
FileExistsReadWrite, OutputA boolean indicating downstream processes whether files were found or not
Table 1: Variables on the SSIS package
Screenshot showing the variables and their configuration on the script task

The script is a quite simple implementation as below:

public void Main()
{
    // SQLTwins: SSIS: Blog #0421

    string searchPath = Dts.Variables["User::SearchPath"].Value.ToString();
    string searchPattern = Dts.Variables["User::SearchPattern"].Value.ToString();

    System.Collections.Generic.List<string> searchResults = System.IO.Directory.EnumerateFileSystemEntries(searchPath, searchPattern).ToList();

    if (searchResults.Any())
    {
        Dts.Variables["User::FileExists"].Value = true;
    }

    Dts.TaskResult = (int)ScriptResults.Success;
}

Here’s the script in action:

Screenshot showing the script in debug mode indicating that files were found matching the pattern.

As you can see, the script can help perform a wild-card search in a given folder or directory.

Further Reading:

  • File System errors when trying to move and rename a file [Blog Link]
  • Adding Date & Time to file names after processing [Blog Link]
  • VSTA Errors when working with SSIS packages [Blog Link]
  • System.IO.Directory.EnumerateFiles [MSDN Link]

Until we meet next time,

Be courteous. Drive responsibly.

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