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We recommend you avoid pessimistic locking unless you really need it because the database locks the record or page during the transaction. Even if you are using optimistic locking, use the lowest lock (i.e., the READ lock) if it will satisfy your application requirement. Using DELETE_CASCADE appropriately In chapter 8, we discussed setting the cascade type to REMOVE for one-to-many or one-to-one relationships. If you set cascade to REMOVE or ALL, when you remove an entity any associated entities are also automatically removed. For example, if we remove a Seller entity, then the associated BillingInfo is also removed. This will lead to at least two DELETE statements in the database.

Native pointers should not refer into the managed heap, because a managed object that a native pointer would refer to could be relocated So far, I have discussed two concepts for referring into the managed heap These are tracking handles (and tracking references) that refer to a managed object s header, as well as interior pointers that refer to a part of the managed object s state The runtime is able to automatically update all tracking handles and interior pointers However, the runtime is not aware of native pointers referring into the managed heap Therefore, it cannot update native pointers Nevertheless, there can be scenarios in which reading or updating the state of a managed object directly from native code is desired.

public class Seller { ... @OneToOne(cascade = CascadeType.REMOVE) public BillingInfo getBillingInfo() { } }

For a one-to-many relationship, it may lead to removal of multiple rows, which could have a negative impact on performance. Many databases support enforcing a CASCADE DELETE constraint on tables:

CREATE TABLE BillingInfo ( billing_id number(10) not null, ... CONSTRAINT fk_user FOREIGN KEY (user_id) REFERENCES supplier (user_id) ON DELETE CASCADE )

Design the XML Messages and XSD Schemas (Step 1)

We suggest you consider using CASCADE DELETE as a table constraint. This normally yields better performance than a DELETE statement. Using the cascade property Remember from our discussions in part 3 that you can set the cascade type of relationships to NONE, PERSIST, MERGE, REFRESH, REMOVE, or ALL, as in this example:

For example, instead of copying a managed byte array into a native memory block so that native code can access the copied state, it would be more efficient if native code could directly read the managed array s state For write operations, the situation is similar: instead of modifying a native memory block and copying it byte by byte into a managed array, it would likely be faster to update the managed array directly from native code Reading or modifying the copied state could also require special attention with respect to concurrent updates from other threads NET has a concept that allows native pointers to temporarily refer to a managed object To understand this concept, it is useful to take a step back and review interior pointers.

public class Seller { ... @OneToMany(cascade = CascadeType.ALL) public Items getItems() { } }

Each of these options impacts how the related entities are handled when an entity operation is performed. For example, when set to ALL, the persistence provider will try each operation (persist, merge, refresh, etc.) on the target entity. These may result in unnecessary database operations when you have several associated entities, and each of the operations is cascaded. So when setting the cascade property, take into account the needs of your applications. Bulk updates Your application may require changes to multiple entities within one transaction. You may wish to retrieve a collection of entities and iterate through each to make changes. If we want to give Gold status to all Sellers who have been members of ActionBazaar for longer than five years, we can do it like this:

Query query = em.createQuery( "SELECT s FROM Seller s WHERE s.createDate <= 1"); ... List sellers = query.getResultList(); Iterator i = seller.iterator(); while (i.hasNext()) { Seller seller = (seller) i.next(); Seller.setStatus("Gold"); }

This will lead to many UPDATE statements being generated by the persistence provider. You can reduce this to a single UPDATE statement by using the bulk Update feature of JPQL as follows:

XML messages represent the operations that your Web service supports, and they correlate to implemented Web methods. XML messages do not contain implementation logic. Instead, they simply document the name of an operation and its input and output types. XML messages must be designed in conjunction with XSD schema files. The best starting point is to

An interior pointer allows managed code to iterate through a managed array via pointer arithmetic, as this sample from 2 shows: void WeakEncrypt(array<unsigned char>^ bytes, unsigned char key) { cli::interior_ptr<unsigned char> pb = &(bytes[0]); interior_ptr<unsigned char> pbEnd = pb + bytes->Length; while (pb < pbEnd) { *pb ^= key; pb++; } }.