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Using Hibernate-managed JDBC connections
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The sample configuration file in listing 3.1 uses Hibernate-managed JDBC connections. You would typically encounter this configuration in a nonmanaged environment, such as a standalone application. Listing 3.1 Example hibernate.cfg.xml file
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< xml version="1.0" > <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration3.0.dtd"> <hibernate-configuration> <session-factory> <property name="connection.username">uid</property> <property name="connection.password">pwd</property> <property name="connection.url"> jdbc:mysql://localhost/db </property> <property name="connection.driver_class"> com.mysql.jdbc.Driver
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Hibernate basics
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</property> <property name="dialect"> org.hibernate.dialect.MySQLDialect </property> <mapping resource="com/manning/hq/ch03/Event.hbm.xml"/> <mapping resource="com/manning/hq/ch03/Location.hbm.xml"/> <mapping resource="com/manning/hq/ch03/Speaker.hbm.xml"/> <mapping resource="com/manning/hq/ch03/Attendee.hbm.xml"/> </session-factory> </hibernate-configuration>
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To use Hibernate-provided JDBC connections, the configuration file requires the following five properties:
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connection.driver_class The JDBC connection class for the specific database connection.url The full JDBC URL to the database connection.username The username used to connect to the database connection.password The password used to authenticate the username dialect The name of the SQL dialect for the database The connection properties are common to any Java developer who has worked with JDBC in the past. Since you re not specifying a connection pool, which we cover later in this chapter, Hibernate uses its own rudimentary connection-pooling mechanism. The internal pool is fine for basic testing, but you shouldn t use it in production.
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The dialect property tells Hibernate which SQL dialect to use for certain operations. Although not strictly required, it should be used to ensure Hibernate Query Language (HQL) statements are correctly converted into the proper SQL dialect for the underlying database. The dialect property tells the framework whether the given database supports identity columns, altering relational tables, and unique indexes, among other database-specific details. Hibernate ships with
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Configuring Hibernate
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more than 20 SQL dialects, supporting each of the major database vendors, including Oracle, DB2, MySQL, and PostgreSQL. Hibernate also needs to know the location and names of the mapping files describing the persistent classes. The mapping element provides the name of each mapping file as well as its location relative to the application classpath. There are different methods of configuring the location of the mapping file, which we ll examine later.
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Using a JNDI DataSource
To use Hibernate with database connections provided by a JNDI DataSource, you need to make a few changes to the configuration file, as shown in listing 3.2. Listing 3.2 Modified hibernate.cfg.xml file
< xml version="1.0" > <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration3.0.dtd"> Sets JNDI name <hibernate-configuration> of SessionFactory <session-factory name="java:comp/env/hibernate/SessionFactory"> <property name="connection.datasource"> jdbc/myDataSource Specifies name of JNDI DataSource </property> <property name="dialect"> org.hibernate.dialect.MySQLDialect </property> <mapping resource="com/manning/hq/ch03/Event.hbm.xml"/> <mapping resource="com/manning/hq/ch03/Location.hbm.xml"/> <mapping resource="com/manning/hq/ch03/Speaker.hbm.xml"/> <mapping resource="com/manning/hq/ch03/Attendee.hbm.xml"/> </session-factory> </hibernate-configuration>
You would typically use this type of configuration when using Hibernate with an application server. The connection.datasource property
Hibernate basics
must have the same value as the JNDI DataSource name used in the application server configuration. The dialect property serves the same purpose as the previous configuration file example. At this point, you have almost enough information to configure Hibernate. The next step is to create mapping definitions for the objects you intend to persist.
3.2 Creating mapping definitions
Mapping definitions, also called mapping documents, are used to provide Hibernate with information to persist objects to a relational database. The mapping files also provide support features, such as creating the database schema from a collection of mapping files. Mapping definitions for persistent objects may be stored together in a single mapping file. Alternatively, the definition for each object can be stored in an individual mapping file. The latter approach is preferred, since storing the definitions for a large number of persistent classes in one mapping file can be cumbersome. We use the file-per-class method to organize our mapping documents throughout this book. There is another advantage to having multiple mapping files: If you have all mapping definitions in a single file, it may be hard to debug and isolate any error to a specific class definition. The naming convention for mapping files is to use the name of the persistent class with the hbm.xml extension. The mapping file for the Event class is thus Event.hbm.xml. The Event.hbm.xml file is shown in listing 3.3. Listing 3.3 The Event.hbm.xml mapping file
< xml version="1.0" > <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.manning.hq.ch03"> <class name="Event" table="events">
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