In this article, we will explore how to use the Konesans File Watcher Task in SQL Server Integration Services (SSIS) to process data files as soon as they arrive in a directory. This task provides a lightweight and efficient solution for monitoring a directory and triggering actions based on the arrival of new files.
First, let’s understand the scenario we will be working with. We have a designated “drop directory” where Excel files will be delivered for processing. Each Excel file will have a specific format and contain a worksheet named “Products” with a fixed set of columns. Our goal is to develop an SSIS package that waits for a file to arrive in the drop directory and then loads that file into a SQL Server table.
The Konesans File Watcher Task offers several beneficial features that make it a better option than other solutions. Firstly, it waits until exclusive access to a found file can be gained before allowing control to pass to the rest of the package. This ensures that the file is not processed while it is still being written to. Secondly, it captures the name of the found file into a variable for later use. This allows us to easily reference the file name in subsequent tasks. Additionally, the task can recognize existing files in the directory being watched, making it easier to handle files that are already present when the package starts. Lastly, it is simple to configure the task to watch for files in a directory referenced as a network UNC path.
Now, let’s discuss the steps involved in implementing this solution using the Konesans File Watcher Task:
- Create a new SSIS package in SQL Server Data Tools (SSDT).
- Add the Konesans File Watcher Task to the package.
- Configure the task to watch for new files in the drop directory.
- Move the file from the drop directory to a processing directory using a File System Task.
- Clear the database staging table using an Execute SQL Task.
- Load the Excel file into the staging table using a Data Flow Task.
- Move the file from the processing directory to an archive directory using a File System Task.
- Exit the package.
By following these steps, we can create a robust and efficient SSIS package that processes Excel files as soon as they arrive in the drop directory. The Konesans File Watcher Task provides a reliable and easy-to-use solution for monitoring directories and triggering actions based on file arrivals.
It is important to note that there are some drawbacks to using the Konesans File Watcher Task. Firstly, it requires installation on all workstations and servers where the package will be developed or executed. Secondly, it is a closed-source tool, meaning we cannot review the source code. These factors may be a barrier to adoption for some individuals or organizations.
In conclusion, the Konesans File Watcher Task is a powerful tool for monitoring directories and processing files in SSIS. It offers several beneficial features that make it a preferred option in many cases. However, it is important to consider the drawbacks and evaluate whether it aligns with your specific requirements and constraints.