mysqlstmtfreeresult

The mysql_stmt_free_result function in the MySQL C API is used to deallocate the result set buffer associated with a prepared statement. When a prepared statement is executed and produces a result set, the data is typically buffered by the MySQL client library. This buffering allows for efficient retrieval of results using functions like mysql_stmt_fetch.

However, once the application has finished processing or retrieving all the data from a result set, it is good practice to release the memory associated with that result set. This is where mysql_stmt_free_result comes in. Calling this function signals to the client library that the result set buffer can be freed, making the memory available for other uses.

It is important to call mysql_stmt_free_result after all rows have been fetched or if the application decides to abandon fetching the remaining rows of a result set. If mysql_stmt_free_result is not called, the memory allocated for the result set will not be released until the statement handle itself is closed using mysql_stmt_close or the connection is closed. Failing to free result sets can lead to memory leaks, especially in applications that execute many prepared statements with large result sets. The function takes a pointer to a MYSQL_STMT structure as its argument, which represents the prepared statement.