composite-key

I have a composite key in a database table / NHibernate entity. Can I somehow use the .Get method to grab a specific entity or do I have to use HQL / Criteria due to the composite key? lcranf You can only use Session.Get() if you used a key class as suggested here: nHibernate Composite Key Class Type Mismatch With this composite key mapping: <class name="MyClass"> <composite-id> <key-property name="Key1" /> <key-property name="Key2" /> </composite-id> <property name="..." /> </class> ...you can use .Get like this: var x = Session.Get<MyClass>(new MyClass() { Key1 = 'Foo', Key2 = 'Bar'}); 来源：

I'm asking and answering my own question , but i'm not assuming i have the best answer. If you have a better one, please post it! Related questions: How to set a backreference from an @EmbeddedId in JPA hibernate mapping where embeddedid (?) JPA Compound key with @EmbeddedId I have a pair of classes which are in a simple aggregation relationship: any instance of one owns some number of instances of the other. The owning class has some sort of primary key of its own, and the owned class has a many-to-one to this class via a corresponding foreign key. I would like the owned class to have a

I'm getting to grips with EF4 code first, and liking it so far. But I'm having trouble mapping an entity to a table with a composite primary key. The configuration I've tried looks like this: public SubscriptionUserConfiguration() { Property(u => u.SubscriptionID).IsIdentity(); Property(u => u.UserName).IsIdentity(); } Which throws this exception: Unable to infer a key for entity type 'SubscriptionUser'. What am I missing? You could also use HasKey(u => new { u.SubscriptionID, u.UserName }); Edit: One limitation I have found is that the following do not work: public

I have a table that has two foreign keys to two different tables with both foreign keys sharing one column : CREATE TABLE ZipAreas ( country_code CHAR(2) NOT NULL, zip_code VARCHAR(10) NOT NULL, state_code VARCHAR(5) NOT NULL, city_name VARCHAR(100) NOT NULL, PRIMARY KEY (country_code, zip_code, state_code, city_name), FOREIGN KEY (country_code, zip_code) REFERENCES Zips (country_code, code), FOREIGN KEY (country_code, state_code, city_name) REFERENCES Cities (country_code, state_code, name) ) As you can see, there are two FKs sharing country_code (coincidentally referencing the same column at

Goal : I want to have importJobId in ImportJob as foreign key for id of allocation table, such that when we have importJobId then and then only we can have id in allocation as without Job there cannot be any allocations. ImportJob table has composite primary key as [ORGID,IMPORTJOBTYPE] and am trying to get create foreign key relationship in hibernate using <id name="id" column="ID"> <generator class="native"/> </id> <many-to-one name="importjobid" class="com.delta.pdo.admin.ImportJob" cascade="save-update"/> in Allocation.hbm.xml which is not working out and am getting error message as: