Why Am I Getting \'Unread Result Found\' Errors with Python\'s MySQL Connector and How Can I Fix Them?

Python MySQL Connector: Unread Result Found When Using Fetchone

In Python, encountering "Unread result found" errors while utilizing the MySQL connector often stems from using the fetchone() function without properly consuming all results. This error occurs when executing subsequent queries without first fetching and consuming any existing results from previous queries.

To resolve this issue, ensure that all results from executed queries are fetched and consumed before moving on to subsequent queries. One approach is to use the cursor.fetchall() method to retrieve all results and clear the buffer. This can be achieved by adding try/except blocks to capture and handle any InterfaceErrors.

However, in this specific scenario, the issue lies in the lack of a buffered cursor. By default, cursors are created without buffering. Enabling buffering ensures that all results from a query are pre-fetched and reside within the client memory. To enable buffering, initiate the cursor with the buffered=True parameter:

cursor = cnx.cursor(buffered=True)

With buffered cursors, fetchone() will return a single row from the pre-fetched result set, eliminating the error caused by unread results. It's important to note that buffered cursors may consume more memory, especially when working with large result sets. Consider using unbuffered cursors for improved performance in such cases. Remember to manually fetch and consume all results to prevent the "Unread result found" error.

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