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Making a detached object transient Finally, you can make a detached instance transient, deleting its persistent state from the database, as in listing 9.8.

Listing 9.8 Making a detached object transient using delete()

9-19

The partial result set produced by either of these two commands is displayed in Figure 1-9.

Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); session.delete(item); tx.commit(); session.close();

Rather than statically configuring all of the client workstations with private IP addresses or using a separate DHCP server to issue IP addresses, NAT can be configured to issue any DHCP-enabled client a private IP address. (See Figure 9-3.)

The next sample provides the same result set as the previous one, but it also adds a rollup row that produces the summary of both columns:

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This means you don t have to reattach (with update() or lock()) a detached instance to delete it from the database. In this case, the call to delete() does two things: It reattaches the object to the Session and then schedules the object for deletion, executed on tx.commit(). The state of the object after the delete() call is removed. Reattachment of detached objects is only one possible way to transport data between several Sessions. You can use another option to synchronize modifications to a detached instance with the database, through merging of its state. Merging the state of a detached object Merging of a detached object is an alternative approach. It can be complementary to or can replace reattachment. Merging was first introduced in Hibernate to deal with a particular case where reattachment was no longer sufficient (the old name for the merge() method in Hibernate 2.x was saveOrUpdateCopy()). Look at the following code, which tries to reattach a detached object:

Figure 9-3

SELECT Production.ProductCategory.ProductCategoryID , Production.Product.ProductSubcategoryID , AVG(Listprice) AS 'Average'

item.getId(); // The database identity is "1234" item.setDescription(...); Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); Item item2 = (Item) session.get(Item.class, new Long(1234)); session.update(item); // Throws exception! tx.commit(); session.close();

5

FROM Production.Product JOIN Production.ProductSubcategory ON Production.ProductSubcategory.ProductSubcategoryID = Production.Product.ProductSubcategoryID JOIN Production.ProductCategory ON Production.ProductSubcategory.ProductCategoryID = Production.ProductCategory.ProductCategoryID WHERE ListPrice <> 0 GROUP BY GROUPING SETS (ROLLUP(Production.ProductCategory.ProductCategoryID), (Product.ProductSubcategoryID));

Given is a detached item object with the database identity 1234. After modifying it, you try to reattach it to a new Session. However, before reattachment, another instance that represents the same database row has already been loaded into the

5-37

persistence context of that Session. Obviously, the reattachment through update() clashes with this already persistent instance, and a NonUniqueObjectException is thrown. The error message of the exception is A persistent instance with the same database identifier is already associated with the Session! Hibernate can t decide which object represents the current state. You can resolve this situation by reattaching the item first; then, because the object is in persistent state, the retrieval of item2 is unnecessary. This is straightforward in a simple piece of code such as the example, but it may be impossible to refactor in a more sophisticated application. After all, a client sent the detached object to the persistence layer to have it managed, and the client may not (and shouldn t) be aware of the managed instances already in the persistence context. You can let Hibernate merge item and item2 automatically:

Although you can still use WHERE clauses to limit the result set based on values that exist in the columns specified in the FROM clause, the HAVING clause allows you to filter based on the results of the calculations performed by the aggregate functions. The following query uses a HAVING clause that returns only product subcategories where the minimum price is greater than $200:

item.getId() // The database identity is "1234" item.setDescription(...); Session session= sessionFactory.openSession(); Transaction tx = session.beginTransaction(); Item item2 = (Item) session.get(Item.class, new Long(1234)); Item item3 = (Item) session.merge(item); (item == item2) // False (item == item3) // False (item2 == item3) // True return item3; tx.commit(); session.close();

SELECT Production.ProductCategory.ProductCategoryID , Production.Product.ProductSubcategoryID , AVG(Listprice) AS 'Average' , MIN(Listprice) AS 'Minimum' , MAX(Listprice) AS 'Maximum'

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