The Persistence Tier in Java

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CHAPTER 9 The Persistence Tier
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O/R mapping frameworks, such as Hibernate, TOPLink, and iBatis, simplify storing objects in databases and the associated SQL programming details, and therefore help close the semantic gap They provide libraries of classes that can do the mapping automatically using declarative descriptions These mapping descriptions are typically provided by the programmers in the form of annotations or XML files For example, when you send a message to a data layer object to get the game information, the framework will automatically create the proper query, execute it, and then process the SQL results to translate them into game objects From the business layer perspective, the persistence layer looks like an object store You should not let this simple description mislead you about the complexity of the more general object-relational mapping problem This subject has been studied in great detail, and you should consult references that are available elsewhere
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Overview of Iterations
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The Data Tools component of the Web Standard Tools (WST) subproject of WTP lets you work with relational databases from many vendors (see the Data Tools section in 2) With these tools you can browse database schemas and tables, sample the data, run SQL queries, and edit the contents of tables Shortly after the creation of WTP, the Eclipse Data Tools Platform (DTP) project was created and seeded with the WTP Data Tools and contributions from Sybase Future releases of WTP will depend on features of DTP instead of the Data Tools component (see the Eclipse Data Tools Platform (DTP) Project section in 17) The EJB Tools component of the J2EE Standard Tools (JST) subproject of WTP lets you create EJB 21 entity beans (see the EJB Tools section in 2) These beans can be either created from scratch or generated from tables With EJB 30, the entity bean specification has changed significantly JPA has evolved out of this work Persistence with JPA can be as simple as adding a few annotations to a Java class The resulting class can be used without an EJB container The Dali incubator project of WTP lets you develop JPA-based Java applications (see the Eclipse Dali Java Persistence Architecture (JPA) Tools Project section in 17) This chapter describes how to develop the persistence tier of League Planet using WTP in the following iterations:
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In Iteration 1 you create a database and a table that stores League Planet schedule information You design, create, and query a table using the SQL editor You enter game data using the Database Explorer
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Iteration 1: Creating a Database
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In Iteration 2 you develop a persistence layer with Java Data Access Objects (DAO) that use JDBC APIs to read and write the objects to the League Planet database You then develop a simple Web application that uses this layer to display game information In Iteration 3 you develop a persistence tier with CMP entity beans to read and write objects You use the XDoclet wizard to generate these EJBs
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At the end of this chapter you will be able to create, modify, and query databases using the Data Tools, access databases using JDBC, and develop CMP entity beans using XDoclet
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Iteration 1: Creating a Database
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The League Planet database stores information about leagues, teams, players, and games in an organized fashion so that users can enter and query their data In this iteration you will create a database and a table that stores League Planet schedule information To create a database you will need a database management system (DBMS) This chapter assumes you are using Apache Derby; however, any relational database supported by WTP should also work You ll perform the following tasks:
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Install Apache Derby Use the Database Explorer and New Connection wizard to connect to the database Use the Database Explorer to display and browse the contents of a database Save the database state to work in the offline mode Use the SQL Scrapbook page to run SQL code, create a new table, and review results of SQL execution using the Data Output window Use the Table explorer to browse tables Use the Table editor to enter new games and edit data in the tables
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1 WTP supports many databases, including Apache Derby Install Derby on your machine (see the Getting Derby sidebar in 3) The project Web site includes excellent documentation to get you started You can also refer to [Zikopoulos2005] for more insight Derby is a pure Java, embeddable database, which means that the database runs in the same JVM process as the rest of the application For example, Derby can be embedded in a single-user stand-alone Java application or a multi-user Web application server It is also possible to use Derby as a network server using the Network Client driver
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