Fixing the SQL Error: No Result Rows When Using Postman with JSON

Learn how to resolve the common SQL error: `NO result rows in the set` when inserting data into your database using Go and Postman. Improve your database transaction skills.
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Understanding the SQL Error: NO Result Rows in Set

If you've ever encountered the error message No result rows in the set while working with SQL queries in Go, especially when sending JSON data via Postman, you're not alone. This common issue typically arises during the execution of an insert or update query when the expected results are not returned.

When working with SQL, particularly in a transaction, ensuring your insert/update statements correctly handle conflicts and return the appropriate results is crucial. In this guide, we will dive into the reasons behind this error and provide a structured solution to fix it.

The Problem: Error Explained

The error occurs when the code attempts to retrieve a result using the Scan method on a query that does not produce a result set. Typically, QueryRow returns a single row, ideal for SELECT statements but not suited for INSERT or UPDATE attempts, which don't generate rows.

Key Causes of the Error:

Using QueryRow with statements that do not return data (like INSERT or UPDATE).

Incorrect parameter binding in the query execution.

The Solution: Using ExecContext

To resolve this error, we can utilize the ExecContext method instead of QueryRow. The ExecContext method is specifically designed for executing statements that do not return rows, such as INSERT or UPDATE. Let's break it down into steps.

Step-by-Step Implementation

Begin a Transaction: Start by initiating a database transaction using the Begin() method.

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Write the SQL Query: Prepare the SQL query string, ensuring it includes your intended fields and handles conflicts.

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Execute the Query: Use the ExecContext() method to execute the query, passing in the parameters.

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Error Handling: Check for errors during execution. If an error occurs, rollback the transaction. Otherwise, log the results of the execution.

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Commit the Transaction: Finally, once everything is confirmed successful, commit the transaction.

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Understanding the Results

After executing the query with ExecContext, you can retrieve additional information about the execution:

LastInsertId() gives you the ID of the last inserted row.

RowsAffected() tells you how many rows were impacted by your query.

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Conclusion

In summary, resolving the No result rows in the set error involves using the ExecContext method in Go for executing your insert/update SQL queries. By following the structured solution outlined in this post, you can efficiently handle transactions and ensure your code functions as intended when manipulating database records.

Make sure to adjust your database operations according to this guidance, and you'll significantly reduce the chances of encountering similar SQL issues in the future.