MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0
As of MySQL 8.0.23, a component service provides access to query
attributes (see Section 11.6, “Query Attributes”). The
query_attributes component uses this service to
provide access to query attributes within SQL statements.
Purpose: Implements the
mysql_query_attribute_string()
function that takes an attribute name argument and returns the
attribute value as a string, or NULL if the
attribute does not exist.
URN: file://component_query_attributes
Developers who wish to incorporate the same query-attribute
component service used by query_attributes
should consult the mysql_query_attributes.h
file in a MySQL source distribution.