How to Properly Retrieve Results from MySQL Stored Procedures in Python?

Calling MySQL Stored Procedures with Python Cursors

When utilizing MySQL stored procedures in Python applications, it's crucial to handle result retrieval properly. Although it may appear straightforward, retrieving results from procedures can lead to some unexpected errors.

A common challenge is encountering the exception "No result set to fetch from" when using cursor.fetchall(). This occurs because stored procedures often return multiple result sets, and cursor.fetchall() is designed to iterate through only one set.

To resolve this issue, it's necessary to retrieve the specific result set of interest. This can be done using the cursor.stored_results() method, which returns a generator of result sets. Each result set can then be separately fetched using fetchall().

In certain scenarios, you may also encounter the error "Use cmd_query_iter for statements with multiple queries" when using cursor.execute(). This occurs because the connector mistakenly interprets the procedure call as a multiple-query statement.

To rectify this issue, it's recommended to explicitly set the multi=True parameter when executing multiple queries. This ensures that the connector correctly handles such scenarios.

By following these guidelines, you can retrieve results from stored procedures effectively and handle multiple result sets as needed.

The above is the detailed content of How to Properly Retrieve Results from MySQL Stored Procedures in Python?. For more information, please follow other related articles on the PHP Chinese website!