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If a container-provided (through injection or obtained through lookup) EntityManager is invoked for the first time, a persistence context begins. By default, it s transaction-scoped and closes when the system transaction is committed or rolled back. It s automatically flushed when the transaction is committed.
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create table USERS ( USERNAME varchar(15) not null primary key, NAME varchar(50) not null, ADDRESS varchar(100) ) create table BILLING_DETAILS ( ACCOUNT_NUMBER varchar(10) not null primary key, ACCOUNT_NAME varchar(50) not null, ACCOUNT_TYPE varchar(2) not null, USERNAME varchar(15) foreign key references user )
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However, it s usually inconvenient to have an association in a composite identifier class, so this approach isn t recommended except in special circumstances. Since USER has a composite primary key, any referencing foreign key is also composite. For example, the association from Item to User (the seller) is now mapped to a composite foreign key. To our relief, Hibernate can hide this detail from the Java code. We can use the following association mapping for Item:
Document by ean reader.termDocs( term ); while ( termDocs.next() ) { bitSet.clear( termDocs.doc() ); Filter them out }
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would be thrown away immediately (Hibernate flattens the tabular result set to build the object graph). You may fetch as many one-to-one or many-toone associations as you like.
Unlike many other programming languages (C, C++, Pascal, and so on), C# provides garbage collection. Your objects are destroyed after you are done with them although not immediately after; they re destroyed when the garbage collection process runs, which is determined by the system. You do not need to worry about cleaning up after your objects unless you use unmanaged or scarce resources. An unmanaged resource is an operating-system feature outside the .NET Framework, such as a connection to a database. A scarce resource is a resource that you have in limited quantity, perhaps because of licensing limitations or limited bandwidth. Graphics resources, such as fonts and brushes, are considered scarce because of the way the operating system works. If you do control an unmanaged resource, you need to explicitly free that resource when you are done with it. Typically, you ll manage this by implementing the IDisposable interface. (You will learn more about interfaces in 13.) The IDisposable interface requires you to create a method named Dispose( ), which will be called by your clients. If you provide a Dispose( ) method, you should stop the garbage collector from calling your object s destructor. To stop the garbage collector, call the static method GC.SuppressFinalize( ), passing in the this reference for your object. Your finalizer can then call your Dispose( ) method. Thus, you might write:
// Set to null so we don't ever leak instances between test runs bean = null;
This chapter will be a little different from most others that you ll find in Manning s Bitter books. We won t really illustrate how to use or misuse a major EJB feature. Instead, we ll show you why EJB entity beans should be avoided and suggest alternatives. If you re strongly committed to entity beans, then we invite you to skip this chapter and move on to the next one. (You won t be tested, and you won t need this information to understand the rest of the book.) If you re open to exploring entity bean alternatives, then read on. In chapter 7, we discussed antipatterns caused by common, but avoidable, misuses of the entity bean specification. In this chapter, we will focus on problems not easily solved within the realm of EJB entity beans. To provide a clear view of the landscape, we ll present a simple application that supports persistent objects with three different alternatives: EJB CMP, JDBC, and object-oriented persistence frameworks. Against that backdrop, we ll fully explore several entity
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