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Suppose certain customers want to deviate from this default and swap the order. Rather than provide a separate properties file for each customer, we could use the <replaceregexp> task to maintain a single file and note the exceptions (perhaps in a customer-specific properties file loaded in Ant), as the following code illustrates:

In the CaveatEmptor domain model, you use the nullable type java.lang.Long as your identifier property type everywhere. Because you re using generated,

synthetic identifiers, this solves the problem New instances have a null identifier property value, so Hibernate treats them as transient Detached instances have a nonnull identifier value, so Hibernate treats them accordingly It s rarely necessary to customize the automatic detection routines built into Hibernate The saveOrUpdate() method always knows what to do with the given object (or any reachable objects, if cascading of save-update is enabled for an association) However, if you use a natural composite key and there is no version or timestamp property on your entity, Hibernate has to hit the database with a SELECT to find out if a row with the same composite identifier already exists.

<project name="Regexp" default="default"> <property name="customer" value="normal"/> <property file="${customer}.properties"/> <target name="init"> <delete dir="output"/> <mkdir dir="output"/> </target> <target name="default" depends="init" if="customer.different"> <copy file="display.properties" todir="output"/> <replaceregexp file="output/display.properties" match="sort.order=(.*),(.*)" replace="sort.order=\2,\1" byline="true" /> </target> </project>

In other words, we recommend that you almost always use saveOrUpdate() instead of the individual save() or update() methods, Hibernate is smart enough to do the right thing and it makes transitive all of this should be in persistent state, no matter if new or old much easier to handle We ve now discussed the basic transitive persistence options in Hibernate, for saving new instances and reattaching detached instances with as few lines of code as possible Most of the other cascading options are equally easy to understand: persist, lock, replicate, and evict do what you would expect they make a particular Session operation transitive The merge cascading option has effectively the same consequences as save-update It turns out that object deletion is a more difficult thing to grasp; the delete-orphan setting in particular causes confusion for new Hibernate users.

The <replaceregexp> shown matches a comma-delimited sort.order line and replaces it with the two fields swapped. The <replaceregexp> task modifies files in place. Notice that the source file was copied to a working directory prior to replacement. Although the main point is to demonstrate a use of <replaceregexp>, the conditional flag was added to provide some insight into how Ant properties can be used to make life easier, even given exceptions to rules. In this example, an

This isn t because it s complex, but because many Java developers tend to forget that they re working with a network of pointers Considering transitive deletion Imagine that you want to delete a Category object You have to pass this object to the delete() method on a Session; it s now in removed state and will be gone from the database when the persistence context is flushed and committed However, you ll get a foreign key constraint violation if any other Category holds a reference to the deleted row at that time (maybe because it was still referenced as the parent of others) It s your responsibility to delete all links to a Category before you delete the instance This is the normal behavior of entities that support shared references.

acme.properties file could be provided with customer.different=true and Ant run with ant -Dcustomer=acme. Alternatively, customer.different could be enabled directly using ant -Dcustomer.different=yes.

Any value-typed property (or component) value of an entity instance is deleted automatically when the owning entity instance is deleted Value-typed collection elements (for example, the collection of Image objects for an Item) are deleted if you remove the references from the owning collection..

In certain situations, you want to delete an entity instance by removing a reference from a collection. In other words, you can guarantee that once you remove the reference to this entity from the collection, no other reference will exist. Therefore, Hibernate can delete the entity safely after you ve removed that single last reference. Hibernate assumes that an orphaned entity with no references should be deleted. In the example domain model, you enable this special cascading style for the collection (it s only available for collections) of bids, in the mapping of Item: