Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All

Retrieving Class Definitions

Schema queries are WQL statements that request class definitions and information about schema associations. Class providers use schema queries in their instances of the __ClassProviderRegistration class to specify the classes that they support when they register with WMI. Schema queries are placed in the ResultSetQueries, ReferencedSetQueries, and UnsupportedQueries properties of the __ClassProviderRegistration instance.

Schema queries are similar to data queries in that they support the following WQL statements:

A schema query is similar to a REFERENCES OF data query that specifies the ClassDefsOnly keyword; in other words, that returns a result set of class definition objects rather than actual instances of association classes. However, REFERENCES OF returns class definitions only if there are instances present. A schema query returns class definitions whether or not instances are present.



© 2015 Microsoft