Persistence.xml配置說明

<?xml version="1.0" encoding="UTF-8"?>

<persistence version="1.0" xmlns:persistence="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 ">

<!-- 

     Name屬性用於定義持久化單元的名字 (name必選,空值也合法);

     transaction-type 指定事務類型(可選) 

-->

<persistence-unit name="unitName" transaction-type="JTA">

 

   <!-- 描述信息.(可選) -->

   <description> </description>

 

   <!-- javax.persistence.PersistenceProvider接口的一個實現類(可選) -->

   <provider>   </provider>

 

   <!-- Jta-data-source和 non-jta-data-source用於分別指定持久化提供商使用的JTA和/或non-JTA數據源的全局JNDI名稱(可選) -->

   <jta-data-source>java:/MySqlDS</jta-data-source>

   <non-jta-data-source> </non-jta-data-source>

 

   <!-- 聲明orm.xml所在位置.(可選) -->

   <mapping-file>product.xml</mapping-file>

 

   <!-- 以包含persistence.xml的jar文件爲基準的相對路徑,添加額外的jar文件.(可選) -->

   <jar-file>../lib/model.jar</jar-file>

 

   <!-- 顯式列出實體類,在Java SE 環境中應該顯式列出.(可選) -->

   <class>com.domain.User</class>

   <class>com.domain.Product</class>

 

   <!-- 聲明是否掃描jar文件中標註了@Enity類加入到上下文.若不掃描,則以下:(可選) -->

   <exclude-unlisted-classes>false</exclude-unlisted-classes>

 

   <!-- 廠商專有屬性(可選) -->

   <properties>

       <!-- hibernate.hbm2ddl.auto= create-drop / create / update -->

       <property name="hibernate.hbm2ddl.auto" value="update" />

       <property name="hibernate.show_sql" value="true" />

   </properties>

 

</persistence-unit>

</persistence>

 

<?xml version="1.0" encoding="UTF-8"?>

<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

    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">

    

    <!-- 

    persistence-unit name="EjbXmlMappingsPU" // 持久化單元名

    transaction-type="JTA(default)/RESOURCE_LOCAL" // 事務類型

    -->

<persistence-unit name="EjbXmlMappingsPU" transaction-type="JTA">

   <description></description> <!-- 描述 -->

   <provider>oracle.toplink.essentials.PersistenceProvider</provider> <!-- 指定一個持久化提供者 -->

   <jta-data-source>jdbc/MyDataSource</jta-data-source> <!-- 指定JTA數據源 -->

   <non-jta-data-source>jdbc/NonTxMyDataSource</non-jta-data-source> <!-- 指定非JTA數據源 -->

   <mapping-file>META-INF/my_queries.xml</mapping-file> <!-- 指定映射文件 -->

   <mapping-file>META-INF/my_entities.xml</mapping-file>

   <jar-file>my/my-classes.jar</jar-file> <!-- 指定託管類的附加JAR -->

   <class>myclass1</class> <!-- 明確列出的類 -->

   <class>myclass2</class>

   <exclude-unlisted-classes/> <!-- 使本地類不能被加到持久化單元中 -->

   <properties> <!-- 使用提供者屬性 -->

    <property name="toplink.logging.level" value="FINE"/>

    <property name="toplink.cache.size.dafault" value="500"/>

   </properties>

</persistence-unit>

</persistence>

 

<?xml version="1.0"?>

<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/persistencehttp://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">

  <persistence-unit name="itcast" transaction-type="RESOURCE_LOCAL">

     <provider>org.hibernate.ejb.HibernatePersistence</provider>

     <properties>

         <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>

         <property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/>

         <property name="hibernate.connection.username" value="root"/>

         <property name="hibernate.connection.password" value="root"/>

         <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/itcast_shoping?useUnicode=true&amp;characterEncoding=UTF-8"/>

         <property name="hibernate.max_fetch_depth" value="3"/>

         <property name="hibernate.hbm2ddl.auto" value="update"/>

         <property name="hibernate.jdbc.fetch_size" value="18"/>

         <property name="hibernate.jdbc.batch_size" value="10"/>

         <property name="hibernate.show_sql" value="true"/>

         <property name="hibernate.format_sql" value="false"/>

     </properties>

  </persistence-unit>

</persistence>