mysql_result_metadata() returns a value that indicates whether a result set has metadata. It can be useful for metadata-optional connections when the client does not know in advance whether particular result sets have metadata. For example, if a client executes a stored procedure that returns multiple result sets and might change the resultset_metadata system variable, the client can invoke mysql_result_metadata() for each result set to determine whether it has metadata.

For details about managing result set metadata transfer, see Section 3.6.7, “Optional Result Set Metadata”.

mysql_result_metadata() returns one of these values:

enum enum_resultset_metadata {
 RESULTSET_METADATA_NONE= 0,
 RESULTSET_METADATA_FULL= 1
};