mysqlistmtclose

mysqlistmtclose is a function in the MySQL C API that is used to deallocate a prepared statement. When a prepared statement is created, resources are allocated on both the client and server sides to hold the statement's definition and execution plan. The mysqlistmtclose function releases these resources, freeing up memory and improving performance.

To use mysqlistmtclose, you must first have a valid MYSQL_STMT object, which is typically obtained from a successful call to mysql_stmt_prepare. The function takes a pointer to this MYSQL_STMT object as its only argument. It's important to call mysqlistmtclose after you are finished with a prepared statement to prevent memory leaks and ensure efficient resource management.

After calling mysqlistmtclose, the MYSQL_STMT object becomes invalid and should not be used for further operations. Attempting to execute or bind parameters to a closed statement will result in an error. It is good practice to set the pointer to the MYSQL_STMT object to NULL after closing it to avoid accidental reuse.

The mysqlistmtclose function does not return a value. Its primary purpose is to clean up resources associated with a prepared statement. This function is crucial for applications that frequently prepare and execute SQL statements, as it helps maintain a low memory footprint and prevents potential performance degradation over time. Always ensure that all prepared statements are properly closed when they are no longer needed.