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Listing 3-1. Configuration File for the Hibernate Example Database # Filename: C:\home\hsqldb\server.properties # # Hibernate examples database - create a # database on the default port. # Specifies the path to the database # files note that the trailing slash # IS required. server.database.0=file:/home/hsqldb/hibernate/ # Specifies the name of the database server.dbname.0=hibernate You can then manually run the following command from the new Hibernate directory to start up the database server: java -classpath ..\lib\hsqldb.jar org.hsqldb.Server To shut down the database in an orderly fashion, you will want to create and compile the simple Java program shown in Listing 3-2 (this will require hsqldb.jar in the classpath for both compilation and runtime). Listing 3-2. Simple Shutdown Logic for the HSQL Server import java.sql.*; public class Shutdown { public static void main(String[] argv) throws Exception { Class.forName("org.hsqldb.jdbcDriver" ); Connection c = DriverManager.getConnection( "jdbc:hsqldb:hsql://localhost/hibernate", "sa", ""); Statement s = c.createStatement(); s.execute("SHUTDOWN"); c.close(); } } The alternative to this is to use the DatabaseManager tool provided with HSQL. This and many other features are comprehensively documented in the files you unpacked into the HSQL directory and on the HSQL website. Sadly, the details of HSQL are outside the scope of this book, but we think you will find it extremely useful to be aware of this excellent tool.

database If you attempt to remove data that is the target of a foreign key relationship in another table, you will get a referential integrity constraint violation in return Let s look at an example that puts these issues in context Suppose, for example, that a company wishes to reorganize its department structure We want to delete a number of departments and then assign the employees to new departments The first step is to delete the old departments, so the following statement is to be executed: DELETE FROM Department d WHERE dname IN ('CA13', 'CA19', 'NY30') This is a straightforward operation We want to remove the department entities that match the given list of names using a DELETE statement instead of querying for the entities and using the remove() operation to dispose of them.

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But when this query is executed, a PersistenceException exception is thrown, reporting that a foreign key integrity constraint has been violated Another table has a foreign key reference to one of the rows we are trying to delete Checking the database, we see that the table mapped by the Employee entity has a foreign key constraint against the table mapped by the Department entity Because the foreign key value in the Employee table is not NULL, the parent key from the Department table can t be removed We first need to update the Employee entities in question to make sure they do not point to the department we are trying to delete: UPDATE Employee e SET edepartment = null WHERE edepartmentname IN ('CA13', 'CA19', 'NY30') With this change the original DELETE statement will work as expected.

As you will see later with push DI supported by Spring IOC, there is no need for applications to look up objects like EJB remote interfaces. DI promotes good object-oriented design and reuse object composition rather than reuse by inheritance.

Now consider what would have happened if the integrity constraint had not been in the database The DELETE operation would have completed successfully, but the foreign key values would still be sitting in the Employee table The next time the persistence provider tried to load the Employee entities with dangling foreign keys, it would be unable to resolve the target entity The outcome of this operation is vendor-specific, but it may lead to a PersistenceException exception being thrown, complaining of the invalid relationship..

} public void setSoftwareName(String softwareName) { this.softwareName = softwareName; } } Notice that we used the @InheritanceJoinColumn annotation, although we did not have to. The second type of inheritance is the single table inheritance, where the data for the base class and its subclasses is in one table. What differentiates the data in the table is a discriminator column that contains a unique value for the base class and for each subclass. For instance, if we used this strategy for our Book and ComputerBook example, we could have a column on our Book table that contained either BOOK or COMPUTERBOOK for each entry, denoting which class it belonged to. We would specify this inheritance strategy with this annotation on the Book class: @Inheritance(strategy=InheritanceType.SINGLE_TABLE, discriminator_value="BOOK") Our ComputerBook class would contain this annotation: @Inheritance(discriminator_value="COMPBOOK") The last type of inheritance is the table per class inheritance. We would simply specify the inheritance strategy as TABLE_PER_CLASS.

The Java Persistence API has a pluggable Service Provider Interface (SPI) that allows any compliant Java EE server to communicate with any compliant persistence provider implementation. Servers normally have a default provider, though, that is native to the server, meaning that it is implemented by the same vendor or is shipped with the server. In most cases, this default provider will be used by the server, and no special metadata will be necessary to explicitly specify it.

Drawbacks of DI These are the drawbacks of DI: The dependencies are generally hard-coded in XML configuration files that are proprietary and nonstandard. Wiring instances together can become a hazard if there are too many instances and many dependencies that need to be addressed. Dependency on XML-based metadata and excessive use of reflection and bytecode manipulation may impact application performance.

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