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Discover how to display User-Defined Types (UDTs) in Java using the Datastax driver, formatted similarly to how they appear in CQL Shell.
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How to Print UDT with the Datastax Java Driver in a Human-Readable Format

Working with databases can sometimes be a challenging endeavor, particularly when dealing with complex data types like User-Defined Types (UDTs) in Cassandra. A common issue developers face is how to print these UDTs in a format that is easy to read, especially when they need to view the contents in a manner similar to what you would see in the CQL Shell. If you're dealing with the Datastax Java Driver and find yourself seeing object references instead of the actual contents, you’re not alone. Let’s explore how to overcome this problem effectively.

The Challenge: Displaying UDTs in Java

When you retrieve a UDT from Cassandra using the Java driver, you might encounter a situation where the output looks something like this:

[[See Video to Reveal this Text or Code Snippet]]

This output doesn’t tell you much about the data itself. Instead, you want to see a user-friendly representation, like this:

[[See Video to Reveal this Text or Code Snippet]]

To achieve this, we need a method that converts the UDT to a more readable format.

The Solution: Using getFormattedContents()

Fortunately, there’s a straightforward solution to this problem. The Datastax Java Driver provides the getFormattedContents() method, which formats UDTs in a manner that is both readable and similar to how the data is displayed in CQL Shell.

Here’s a Quick Guide on How to Use It

Execute Your Query: Start by executing your CQL statement to retrieve the UDT.

[[See Video to Reveal this Text or Code Snippet]]

Print the UDT: Instead of using System.out.println(resultUDT); or System.out.println(resultUDT.toString());, you should use:

[[See Video to Reveal this Text or Code Snippet]]

Run Your Code: When you run your code with the above line, it should display the UDT in the desired format.

Benefits of Using getFormattedContents()

Readability: The output is formatted nicely, making it easier to understand the structure and the contents of the UDT.

Convenience: It saves time and effort since you don’t have to manually parse or convert the UDT.

Consistency: The output is more consistent with how you would see the data represented in CQL Shell.

Conclusion

Displaying UDTs from Cassandra using the Datastax Java Driver doesn't have to be a cumbersome task. By utilizing the getFormattedContents() method, you can quickly retrieve and print UDTs in a human-readable format that mimics the appearance of data in the CQL Shell. With this approach, you can focus more on your application's logic rather than spending time on formatting data outputs.

Now you have an effective solution to handle UDTs in your Java applications, making your development process smoother and more efficient. Happy coding!