int mysql_stmt_store_result(MYSQL_STMT *stmt)

Description

You must call mysql_stmt_store_result() for every statement that successfully produces a result set (SELECT, SHOW, DESCRIBE, EXPLAIN), and only if you want to buffer the complete result set by the client, so that the subsequent mysql_stmt_fetch() call returns buffered data.

It is unnecessary to call mysql_stmt_store_result() for other statements, but if you do, it does not harm or cause any notable performance problem. You can detect whether the statement produced a result set by checking if mysql_stmt_result_metadata() returns NULL. For more information, refer to Section 25.2.7.22, “mysql_stmt_result_metadata()”.

Note: MySQL doesn't by default calculate MYSQL_FIELD->max_length for all columns in mysql_stmt_store_result() because calculating this would slow down mysql_stmt_store_result() considerably and most applications doesn't need max_length. If you want max_length to be updated, you can call mysql_stmt_attr_set(MYSQL_STMT, STMT_ATTR_UPDATE_MAX_LENGTH, &flag) to enable this. See Section 25.2.7.3, “mysql_stmt_attr_set()”.

Return Values

Zero if the results are buffered successfully. Non-zero if an error occurred.

Errors