Why Am I Getting MySQL Error 2014: 'Cannot Execute Queries While Other Unbuffered Queries Are Active'?

Causes of MySQL Error 2014: Cannot Execute Queries While Other Unbuffered Queries Are Active

This error occurs when attempting to execute a new query before completing processing results from a previous unbuffered query. MySQL's client protocol does not allow multiple queries to be simultaneously "in progress."

Solution:

• Use PDO::fetchAll(): This method fetches all results of the previous query implicitly, allowing execution of the next query.
• Enable Query Buffering: Set PDO::MYSQL_ATTR_USE_BUFFERED_QUERY to true, causing the client library to buffer results internally instead of PHP.
• CloseCursors: Call closeCursor() to inform the server that you're done fetching results from a query.

Additional Recommendations:

• Move loop-invariant code outside of loops: Avoid repeatedly executing a query that returns the same result within a loop.
• Use named parameters for prepared statements to simplify parameter passing.
• Consider using mysqlnd client library for improved features and efficiency.

The above is the detailed content of Why Am I Getting MySQL Error 2014: 'Cannot Execute Queries While Other Unbuffered Queries Are Active'?. For more information, please follow other related articles on the PHP Chinese website!