MySQL :: MySQL 8.4 Reference Manual :: 7.5.4 Query Attribute Components

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7.5.4 查询属性组件

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.

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