== Basics ==
Queries In UBIK, queries are used for fetching a list of objects [[Contentclass|ContentClasses] from the database. Queries will use data base mechanism for perfomant data access. Queries and will deliver a list of objects of a certain [[Metaclass]].
Queries can be used in different scenarios:
* data fetching (n records)
== Query, QueryItem ==
A Query is defined for a single MetaClass. The MetaClass is defined by a Referenceproperty (“FILTEROBJECT”). A Query will deliver objects ContentClasses(instances) of the defined MetaClass.
A Query holds a list of QueryItems. A single QueryItem defines a single filter rule for the evaluation of the result collection:
* OPERATOR
[[Category:UBIK]][[Category:How to...Object]]