【转】JPA persistence.xml 资料

【转】JPA persistence.xml 文件

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JPA配置文件

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<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence persistence_1_0.xsd" version="1.0">    <persistence-unit name="eclipselink" transaction-type="RESOURCE_LOCAL">        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>        <class>org.compass.gps.device.jpa.model.Simple</class>        <class>org.compass.gps.device.jpa.model.SimpleBase</class>        <class>org.compass.gps.device.jpa.model.SimpleExtend</class>        <exclude-unlisted-classes>false</exclude-unlisted-classes>        <properties>            <property name="eclipselink.jdbc.driver" value="org.hsqldb.jdbcDriver"/>            <property name="eclipselink.jdbc.url" value="jdbc:hsqldb:mem:test"/>            <property name="eclipselink.jdbc.user" value="sa"/>            <property name="eclipselink.jdbc.password" value=""/>            <property name="eclipselink.target-database"                      value="org.eclipse.persistence.platform.database.HSQLPlatform"/>            <property name="eclipselink.logging.level" value="OFF"/>            <property name="eclipselink.orm.throw.exceptions" value="true"/>            <property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>            <property name="eclipselink.ddl-generation.output-mode" value="database"/>        </properties>    </persistence-unit>    <persistence-unit name="embeddedeclipselink" transaction-type="RESOURCE_LOCAL">        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>        <class>org.compass.gps.device.jpa.model.Simple</class>        <class>org.compass.gps.device.jpa.model.SimpleBase</class>        <class>org.compass.gps.device.jpa.model.SimpleExtend</class>        <exclude-unlisted-classes>false</exclude-unlisted-classes>        <properties>            <property name="eclipselink.jdbc.driver" value="org.hsqldb.jdbcDriver"/>            <property name="eclipselink.jdbc.url" value="jdbc:hsqldb:mem:test"/>            <property name="eclipselink.jdbc.user" value="sa"/>            <property name="eclipselink.jdbc.password" value=""/>            <property name="eclipselink.target-database"                      value="org.eclipse.persistence.platform.database.HSQLPlatform"/>            <property name="eclipselink.logging.level" value="OFF"/>            <property name="eclipselink.orm.throw.exceptions" value="true"/>            <property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>            <property name="eclipselink.ddl-generation.output-mode" value="database"/>            <property name="eclipselink.session.customizer"                      value="org.compass.gps.device.jpa.embedded.eclipselink.CompassSessionCustomizer"/>            <property name="compass.engine.connection" value="target/test-index"/>            <property name="compass.debug" value="true" />        </properties>    </persistence-unit>    <persistence-unit name="toplink" transaction-type="RESOURCE_LOCAL">        <provider>oracle.toplink.essentials.PersistenceProvider</provider>        <class>org.compass.gps.device.jpa.model.Simple</class>        <class>org.compass.gps.device.jpa.model.SimpleBase</class>        <class>org.compass.gps.device.jpa.model.SimpleExtend</class>        <exclude-unlisted-classes>false</exclude-unlisted-classes>        <properties>            <property name="toplink.jdbc.driver" value="org.hsqldb.jdbcDriver"/>            <property name="toplink.jdbc.url" value="jdbc:hsqldb:mem:test"/>            <property name="toplink.jdbc.user" value="sa"/>            <property name="toplink.jdbc.password" value=""/>            <property name="toplink.target-database" value="oracle.toplink.essentials.platform.database.HSQLPlatform"/>            <property name="toplink.logging.level" value="OFF"/>            <property name="toplink.orm.throw.exceptions" value="true"/>            <property name="toplink.ddl-generation" value="drop-and-create-tables"/>            <property name="toplink.ddl-generation.output-mode" value="database"/>        </properties>    </persistence-unit>    <persistence-unit name="embeddedtoplink" transaction-type="RESOURCE_LOCAL">        <provider>oracle.toplink.essentials.PersistenceProvider</provider>        <class>org.compass.gps.device.jpa.model.Simple</class>        <class>org.compass.gps.device.jpa.model.SimpleBase</class>        <class>org.compass.gps.device.jpa.model.SimpleExtend</class>        <exclude-unlisted-classes>false</exclude-unlisted-classes>        <properties>            <property name="toplink.jdbc.driver" value="org.hsqldb.jdbcDriver"/>            <property name="toplink.jdbc.url" value="jdbc:hsqldb:mem:test"/>            <property name="toplink.jdbc.user" value="sa"/>            <property name="toplink.jdbc.password" value=""/>            <property name="toplink.target-database" value="oracle.toplink.essentials.platform.database.HSQLPlatform"/>            <property name="toplink.logging.level" value="OFF"/>            <property name="toplink.orm.throw.exceptions" value="true"/>            <property name="toplink.ddl-generation" value="drop-and-create-tables"/>            <property name="toplink.ddl-generation.output-mode" value="database"/>            <property name="toplink.session.customizer"                      value="org.compass.gps.device.jpa.embedded.toplink.CompassSessionCustomizer"/>            <property name="compass.engine.connection" value="target/test-index"/>            <property name="compass.debug" value="true" />        </properties>    </persistence-unit>    <persistence-unit name="hibernate" transaction-type="RESOURCE_LOCAL">        <provider>org.hibernate.ejb.HibernatePersistence</provider>        <class>org.compass.gps.device.jpa.model.Simple</class>        <class>org.compass.gps.device.jpa.model.SimpleBase</class>        <class>org.compass.gps.device.jpa.model.SimpleExtend</class>        <exclude-unlisted-classes>false</exclude-unlisted-classes>        <properties>            <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>            <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>            <property name="hibernate.connection.url" value="jdbc:hsqldb:mem:test"/>            <property name="hibernate.connection.username" value="sa"/>            <property name="hibernate.connection.password" value=""/>            <property name="hibernate.search.autoregister_listeners" value="false"/>            <property name="hibernate.hbm2ddl.auto" value="create"/>        </properties>    </persistence-unit>    <persistence-unit name="embeddedhibernate" transaction-type="RESOURCE_LOCAL">        <provider>org.hibernate.ejb.HibernatePersistence</provider>        <class>org.compass.gps.device.jpa.model.Simple</class>        <class>org.compass.gps.device.jpa.model.SimpleBase</class>        <class>org.compass.gps.device.jpa.model.SimpleExtend</class>        <exclude-unlisted-classes>false</exclude-unlisted-classes>        <properties>            <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>            <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>            <property name="hibernate.connection.url" value="jdbc:hsqldb:mem:test"/>            <property name="hibernate.connection.username" value="sa"/>            <property name="hibernate.connection.password" value=""/>            <property name="hibernate.search.autoregister_listeners" value="true"/>            <property name="hibernate.hbm2ddl.auto" value="create"/>            <property name="compass.engine.connection" value="target/test-index"/>            <property name="compass.debug" value="true" />        </properties>    </persistence-unit>    <persistence-unit name="openjpa" transaction-type="RESOURCE_LOCAL">        <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>        <class>org.compass.gps.device.jpa.model.Simple</class>        <class>org.compass.gps.device.jpa.model.SimpleBase</class>        <class>org.compass.gps.device.jpa.model.SimpleExtend</class>        <exclude-unlisted-classes>false</exclude-unlisted-classes>        <properties>            <property name="openjpa.jdbc.DBDictionary" value="hsql"/>            <property name="openjpa.ConnectionDriverName" value="org.hsqldb.jdbcDriver"/>            <property name="openjpa.ConnectionURL" value="jdbc:hsqldb:mem:test"/>            <property name="openjpa.ConnectionUserName" value="sa"/>            <property name="openjpa.ConnectionPassword" value=""/>            <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema"/>        </properties>    </persistence-unit>    <persistence-unit name="embeddedopenjpa" transaction-type="RESOURCE_LOCAL">        <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>        <class>org.compass.gps.device.jpa.model.Simple</class>        <class>org.compass.gps.device.jpa.model.SimpleBase</class>        <class>org.compass.gps.device.jpa.model.SimpleExtend</class>        <exclude-unlisted-classes>true</exclude-unlisted-classes>        <properties>            <property name="openjpa.jdbc.DBDictionary" value="hsql"/>            <property name="openjpa.ConnectionDriverName" value="org.hsqldb.jdbcDriver"/>            <property name="openjpa.ConnectionURL" value="jdbc:hsqldb:mem:test"/>            <property name="openjpa.ConnectionUserName" value="sa"/>            <property name="openjpa.ConnectionPassword" value=""/>            <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema"/>            <property name="compass.engine.connection" value="target/test-index"/>            <property name="compass.debug" value="true" />        </properties>    </persistence-unit></persistence>

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附上一篇不错的文章

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来源：http://www.cnblogs.com/luxh/archive/2012/05/24/2516282.html

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persistence.xml文件必须定义在classpath路径下的META-INF文件夹中。

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我们看看基于Hibernate提供的一个比较完整的JPA2.0的persistence.xml文件。

　　persistence.xml:　

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<?xml version="1.0" encoding="UTF-8"?>  <persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"               xsi:schemaLocation="http://java.sun.com/xml/ns/persistence               http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">          <!--必须要有name属性，不能为空 -->      <persistence-unit name="jpaPU" transaction-type="RESOURCE_LOCAL">           <!--可选 -->           <provider>org.hibernate.ejb.HibernatePersistence</provider>           <!--可选 -->           <jta-data-source>java:/DefaultDS</jta-data-source>           <!--可选 -->           <mapping-file>ormap.xml</mapping-file>           <!--可选 -->           <jar-file>MyApp.jar</jar-file>           <!--可选 -->           <class>org.acme.Employee</class>           <!--可选 -->           <shared-cache-mode>ENABLE_SELECTOVE</shared-cache-mode>           <!--可选 -->           <validation-mode>CALLBACK</validation-mode>                      <!--厂商的特定属性 -->           <properties>              <!--配置Hibernate方言 -->              <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />              <!--配置数据库驱动 -->              <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />              <!--配置数据库用户名 -->              <property name="hibernate.connection.username" value="root" />              <!--配置数据库密码 -->              <property name="hibernate.connection.password" value="root" />              <!--配置数据库url -->              <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/jpa?useUnicode=true&amp;characterEncoding=UTF-8" />              <!--设置外连接抓取树的最大深度 -->              <property name="hibernate.max_fetch_depth" value="3" />              <!--自动输出schema创建DDL语句 -->              <property name="hibernate.hbm2ddl.auto" value="update" />               </properties>      </persistence-unit>                </persistence>

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　　xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"

　　要注意使用的是2.0规范

　　name　　

　　JPA2.0规范要求每一个持久化单元必须有一个名字，不能为空。即persistence-unit name="manager1"的name不能为空。

　　transaction-type

　　使用的事务类型。有JTA和RESOURCE_LOCAL两种类型可以选择。在JavaEE环境中默认为JTA,在JavaSE环境中默认为RESOURCE_LOCAL。当在persistent.xml文件使用<jta-data-source>,默认就是JTA事务，使用<non-jta-data-source>，默认就是使用RESOURCE_LOCAL事务。这两种事务的区别不在这里讨论。　　　　　　　　　　　　　　　　

??? provider

　　EJB Persistence provider的一个实现类。如果不是使用多个厂商的?EJB?Persistence实现，是不需要定义的。

　　mapping-file

　　指定映射文件的位置

???? jar-file

　　指定要解析的jar。jar中所有注解的类、包和所有的hbm.xml都会被添加到persistent-unit的配置中。主要用在JavaEE环境中。

???? exclude-unlisted-classes

　　不检查jar中加了@Entity注解的类。

???? class

　　明确指定要映射的类

???? shared-cache-mode

　　缓存模式。加了@Cacheable注解的默认为二级缓存。有四种模式：ALL-缓存所有实体；NONE-禁止缓存；ENABLE_SELECTIVE-如果加了缓存的标识，是默认的选选　　　　　　　　项；DISABLE_SELECTIVE- enable caching unless explicitly marked as??@Cacheable(false) (not? recommended)

???? validation-mode

　　实体的验证模式，默认是激活的。当一个实体在创建、更新，在实体发送到数据库前会被进行验证。CALLBACK: entities are validated on creation, update and deletion. If no Bean Validation provider??is present, an exception is raised at initialization?time.

???? properties

　　配置厂商的一些特定属性。