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Learn how to efficiently store JSON output from a dynamic stored procedure into a variable in SQL Server using T-SQL.
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Storing EXECUTE Command Output in a Variable in SQL Server

Introduction

If you are working with SQL Server and need to capture the output of a stored procedure into a variable for further processing, you might encounter some challenges. A common requirement is to take the JSON output of a dynamic stored procedure and store it in a variable to use it in another part of your application or in subsequent procedures. In this guide, we will explore how to achieve this effectively.

The Problem

You may have a stored procedure like the following:

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When calling this stored procedure and trying to capture the JSON output into the @ Address variable, you might find the output is empty. This can be frustrating when you want to use that output later, especially if you are passing it to another stored procedure.

The Solution

To properly store the output of a dynamic SQL execution into a variable, you need to use the sp_executesql command with the correct parameters. Here’s how to structure your stored procedure and the calls appropriately.

Step 1: Modify the Stored Procedure

You need to ensure that you're executing the dynamic query using sp_executesql and that you define the output parameter correctly. Here’s an example structure:

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Step 2: Call the Procedure with Correct Parameters

When calling the stored procedure, the output parameter must also be correctly defined. Here is how you should call the procedure:

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Step 3: Use the Output in Another Procedure

If you want to use the JSON output in another stored procedure, make sure to pass the @ Address variable correctly:

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

Conclusion

Storing the output of an EXECUTE command in SQL Server can initially seem complicated, especially when dealing with dynamic SQL and output parameters. However, by following the above steps and restructuring your stored procedure and its calls, you can efficiently capture your desired output and utilize it in your other SQL operations. This technique will not only enhance your coding skills in T-SQL but will also allow for more dynamic and functional stored procedures in your SQL Server projects.

Implement these changes, and you'll find capturing output values to be a seamless part of your SQL workflow.