MYSQL_RES * mysql_stmt_result_metadata(MYSQL_STMT * stmt);
stmt- a statement handle, which was previously allocated by mysql_stmt_init().
If a statement passed to mysql_stmt_prepare() is one that produces a result set, mysql_stmt_result_metadata() returns the result set that can be used to process the meta information such as total number of fields and individual field information.
The result set returned by mysql_stmt_result_metadata() contains only metadata. It does not contain any row results. The rows are obtained by mysql_stmt_fetch().
This result set pointer can be passed as an argument to any of the field-based functions that process result set metadata, such as: mysql_num_fields(), mysql_fetch_field(), mysql_fetch_field_direct(), mysql_fetch_fields(), mysql_field_count(), mysql_field_seek(), mysql_field_tell(), mysql_free_result()