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5 Bean-Managed Persistence Examples
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ATA is at the heart of most business applications In J2EE applications, entity beans represent the business objects that are stored in a database For entity beans with bean-managed persistence, you must write the code for the database access calls Although writing this code is an additional responsibility, you will have more control over how the entity bean accesses a database
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This chapter discusses the coding techniques for entity beans with bean-managed persistence For conceptual information on entity beans, please see What Is an Entity Bean , page (51)
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The SavingsAccountEJB Example 84 Entity Bean Class 85 Home Interface 94 Remote Interface 96 Running the SavingsAccountEJB Example 97 deploytool Tips for Entity Beans With Bean-Managed Persistence 99 Mapping Table Relationships for Bean-Managed Persistence 99 One-to-One Relationships 99 One-to-Many Relationships 103 Many-to-Many Relationships 110 83
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BEAN-MANAGED PERSISTENCE EXAMPLES
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Primary Keys for Bean-Managed Persistence 113 The Primary Key Class 113 Primary Keys in the Entity Bean Class 114 Getting the Primary Key 115 Handling Exceptions 116
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The SavingsAccountEJB Example
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The entity bean illustrated in this section represents a simple bank account The is stored in the table of a relastate of tional database The table is created by the following SQL statement:
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This example also makes use of the following classes:
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The source code for this example is in the directory To compile the code, go to the directory and type A sample file is in the j directory
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A utility class named A client class called
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THE SAVINGSACCOUNT EJB EXAMPLE
Entity Bean Class
The sample entity bean class is called As you look through its code, note that it meets the requirements of any entity bean with bean-managed persistence First of all, it implements the following: interface and methods Zero or more Finder methods Business methods Home methods In addition, an entity bean class with bean-managed persistence has these requirements:
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The EntityBean Interface
The interface extends the interface, which extends the interface The interface declares a number of methods, such as and , which you must implement in your entity bean class These methods are discussed in later sections
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The ejbCreate Method
When the client invokes a method, the EJB container invokes the corresponding method Typically, an method in an entity bean performs the following tasks: Inserts the entity state into the database Initializes the instance variables Returns the primary key method of inserts the entity state into the The database by invoking the private method, which issues the SQL statement Here is the source code for the method:
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