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The second call to session.save() seems redundant, if we re talking about a true parent/children relationship. Hold that thought, and think about entities and value types again: If both classes are entities, their instances have a completely independent lifecycle. New objects are transient and have to be made persistent if you want to store them in the database. Their relationship doesn t influence their lifecycle, if they re entities. If Bid would be a value type, the state of a Bid instance is the same as the state of its owning entity. In this case, however, Bid is a separate entity with its own completely independent state. You have three choices:

Take care of the independent instances yourself, and execute additional save() and delete() calls on the Bid objects when needed in addition to the Java code needed to manage the relationship (adding and removing references from collections, and so on). Make the Bid class a value type (a component). You can map the collection with a <composite-element> and get the implicit lifecycle. However, you lose other aspects of an entity, such as possible shared references to an instance. Do you need shared references to Bid objects Currently, a particular Bid instance isn t referenced by more than one Item. However, imagine that a User entity also has a collection of bids, made by the user. To support shared references, you have to map Bid as an entity. Another reason you need shared references is the successfulBid association from Item in the full CaveatEmptor model. In this case, Hibernate offers transitive persistence, a feature you can enable to save lines of code and to let Hibernate manage the lifecycle of associated entity instances automatically.

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There are a few easy rules for reducing the risk of blocking issues caused by extensive locking:

You don t want to execute more persistence operations than absolutely necessary, and you don t want to change your domain model you need shared references to Bid instances. The third option is what you ll use to simplify this parent/children example. Transitive persistence When you instantiate a new Bid and add it to an Item, the bid should become persistent automatically. You d like to avoid making the Bid persistent explicitly with an extra save() operation. To enable this transitive state across the association, add a cascade option to the XML mapping:

This requirement suggests that you modify the user profiles of the sales representatives. 1. What type of profile will be most useful to maintain a locked-down desktop com mon to all sales representatives a. Local profile b. Local, mandatory profile c. The All Users profile d. Preconfigured roaming group profile e. Preconfigured roaming mandatory group profile

Use the least-restrictive isolation level possible. Consider whether you can make use of the read uncommitted isolation level. Avoid using the repeatable read and serializable isolation levels.

<class name="Item" table="ITEM"> ... <set name="bids" inverse="true" cascade="save-update"> <key column="ITEM_ID"/> <one-to-many class="Bid"/> </set> </class>

The cascade="save-update" attribute enables transitive persistence for Bid instances, if a particular Bid is referenced by a persistent Item, in the collection. The cascade attribute is directional: It applies to only one end of the association. You could also add cascade="save-update" to the <many-to-one> association in the mapping of Bid, but because bids are created after items, doing so doesn t make sense. JPA also supports cascading entity instance state on associations:

Keep your transactions as short as possible (measured in execution time, not number of T-SQL code lines). If you mostly read data, consider using the snapshot and read committed snapshot isolation levels.

2. In Lesson 3, Exercise 5, you created a profile called Sales. You made it a manda tory profile by renaming Ntuser.dat to Ntuser.man. Finally, you assigned it to sev eral users. How can you ensure that each new sales representative utilizes the same profile

public class Item { ... @OneToMany(cascade = { CascadeType.PERSIST, CascadeType.MERGE }, mappedBy = "item") private Set<Bid> bids = new HashSet<Bid>(); ... }

This lab contains two exercises. In the first exercise, you investigate how locks are acquired in the read committed isolation level, which is the default isolation level. In the second exercise, you perform the same tests against the read committed snapshot isolation level.

Cascading options are per operation you d like to be transitive. For native Hibernate, you cascade the save and update operations to associated entities with cascade="save-update". Hibernate s object state management always bundles these two things together, as you ll learn in future chapters. In JPA, the (almost) equivalent operations are persist and merge. You can now simplify the code that links and saves an Item and a Bid, in native Hibernate:

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