How Can I Implement Auto-Reconnection in MySQLdb for Persistent Connections?

Enabling MySQL Client Auto Re-Connection with MySQLdb

In MySQLdb, persistent connections are not enabled by default. This means that if the connection to the MySQL database is lost, the client will need to re-establish the connection manually.

The PHP Method

In PHP, MySQLdb provides the mysql_options() function to enable auto re-connection. By setting the MYSQL_OPT_RECONNECT option to true, the client will attempt to reestablish the connection automatically in case of a connection loss.

The MySQLdb Method

In Python, MySQLdb does not have a direct equivalent of mysql_options(). However, it is possible to implement auto re-connection using a custom function that wraps the cursor.execute() method. The original question suggests that the conn.cursor() method throws an exception when the connection is lost.

Solution

The provided solution addresses this issue by creating a wrapper function called query(). This function attempts to execute the SQL query using the cursor.execute() method. If an error occurs due to a lost connection, the query() function reestablishes the connection and retries the execution.

Implementation

The provided Python code shows how to implement the query() function and use it to establish and maintain a persistent connection to the MySQL database. Even after a long timeout, the connection is still active and allows further queries to be executed.

Conclusion

By leveraging the query() wrapper function, it becomes possible to enable auto re-connection in MySQLdb, ensuring that the client can automatically recover from lost connections.

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