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Or you can do it programmatically, before building the session factory, using cfg.Properties[NHibernate.Cfg.Environment.UseProxyValidator]="false". NHibernate uses two different instances so that even polymorphic associations can be proxied when the proxied object is fetched, it may be an instance of a mapped subclass of Item (if there were any subclasses of Item, that is). You can even choose any interface implemented by the Item class as the type of the proxy. To do so, declare it using the proxy attribute, instead of specifying lazy="true":
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<class name="Item" proxy="ItemInterface">
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As soon as you declare the proxy or lazy attribute on Item, any single-point association to Item is proxied and fetched lazily, unless that association overrides the fetching strategy by declaring the outer-join attribute. There are three possible values for outer-join:
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outer-join="auto" The default. When the attribute isn t specified; NHiber-
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nate fetches the associated object lazily if the associated class has proxying enabled or eagerly using an outer join if proxying is disabled (default). outer-join="true" NHibernate always fetches the association eagerly using an outer join, even if proxying is enabled. This allows you to choose different fetching strategies for different associations to the same proxied class. It s equivalent to fetch="join". outer-join="false" NHibernate never fetches the association using an outer join, even if proxying is disabled. This is useful if you expect the associated object to exist in the second-level cache (see chapter 6). If it isn t available in the second-level cache, the object is fetched immediately using an extra SQL SELECT. This option is equivalent to fetch="select".
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If you wanted to re-enable eager fetching for the association, now that proxying is enabled, you would specify
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<many-to-one name="item" class="Item" outer-join="true">
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For a one-to-one association (discussed in more detail in chapter 7), lazy fetching is conceptually possible only when the associated object always exists. You indicate this by specifying constrained="true". For example, if an item can have only one bid, the mapping for the Bid is
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<one-to-one name="item" class="Item" constrained="true">
The constrained attribute has a slightly similar interpretation to the not-null attribute of a <many-to-one> mapping. It tells NHibernate that the associated object is required and thus can t be null. To enable batch fetching, you specify the batch-size in the mapping for Item:
<class name="Item" lazy="true" batch-size="9">
The batch size limits the number of items that may be retrieved in a single batch. Choose a reasonably small number here.
Retrieving objects
You ll meet the same attributes (outer-join, batch-size, and lazy) when we consider collections, but the interpretation is slightly different.
COLLECTIONS
In the case of collections, fetching strategies apply not just to entity associations but also to collections of values (for example, a collection of strings could be fetched by an outer join). Just like classes, collections have their own proxies, which we usually call collection wrappers. Unlike classes, the collection wrapper is always there, even if lazy fetching is disabled (NHibernate needs the wrapper to detect collection modifications). Collection mappings may declare a lazy attribute, an outer-join attribute, neither, or both (specifying both isn t meaningful). The meaningful options are as follow:
Neither attribute specified This option is equivalent to outer-join="false" lazy="false". The collection is fetched from the second-level cache or by an immediate extra SQL SELECT. This option is most useful when the second-level cache is enabled for this collection. outer-join="true" NHibernate fetches the association eagerly using an outer join. At the time of this writing, NHibernate is able to fetch only one collection per SQL SELECT, so it isn t possible to declare multiple collections belonging to the same persistent class with outer-join="true". lazy="true" NHibernate fetches the collection lazily, when it s first accessed. Since NHibernate 1.2, this is the default option, and we recommend that you keep this option as a default for all your collection mappings.
We don t recommend eager fetching for collections, so you ll map the item s collection of bids with lazy="true". This option is almost always used for collection mappings (although it s the default since NHibernate 1.2, we ll continue to write it to insist on it):
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