Criteria is a simplified API for retrieving entities by composing
NHibernate.Expression objects.
Namespace:
NHibernateAssembly: NHibernate (in NHibernate.dll)
Syntax
Visual Basic (Declaration) |
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Public Interface ICriteria |
C# |
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public interface ICriteria |
Visual C++ |
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public interface class ICriteria |
JavaScript |
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NHibernate.ICriteria = function(); NHibernate.ICriteria.createInterface('NHibernate.ICriteria'); |
Remarks
Using criteria is a very convenient approach for functionality like "search" screens where there is a variable number of conditions to be placed upon the result set.
The Session is a factory for ICriteria. Expression instances are usually obtained via the factory methods on NHibernate.Expression. eg:
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IList cats = session.CreateCriteria(typeof(Cat)) .Add( Expression.Like("name", "Iz%") ) .Add( Expression.Gt( "weight", minWeight ) ) .AddOrder( Order.Asc("age") ) .List(); |
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IList cats = session.CreateCriteria(typeof(Cat)) .CreateCriteria("kittens") .Add( Expression.like("name", "Iz%") ) .List(); |
Hibernate's query language is much more general and should be used for non-simple cases.
