JPA将默认的刷新模式从AUTO更改为COMMIT

Question

我尝试了几种将FlushMode更改为完整应用程序的方法。
这是对的还是还有另一种方法呢？

我不想务实地做到这一点。

这是我发现的属性(property)，但它不起作用。

<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_2_0.xsd"
version="2.0">
    <persistence-unit name="myPU">
        <properties>
            ...
            <property name="hibernate.connection.autocommit" value="false"/>
            <!-- Also tried this: -->

            <property name="org.hibernate.FlushMode" value="commit"/>
            ...
        </properties>
    </persistence-unit>
</persistence>

更新:

我已经按照zxcf的链接中的描述创建了该类，但是我不知道如何在我的persistence.xml中添加此构造。

<property name="jpaDialect">
    <bean class="test.jpa.vendor.HibernateJpaDialect">
        <property name="flushMode" value="MANUAL"/>
    </bean>
</property>

Answer 1

试试这个

<property name="org.hibernate.flushMode" value="COMMIT"/>

在独立程序上进行测试，我可以看到基础Hibernate Session/EntityManager的值从 AUTO更改为 COMMIT
这是我的persistence.xml

<?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_2_0.xsd"
    version="2.0">
  <persistence-unit name="JPATest" transaction-type="RESOURCE_LOCAL">
  <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>  

  <class>com.test.TestEntity</class>  
  <shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode> 
  <properties> 
      <property name="hibernate.hbm2ddl.auto" value="update"/>
      <property name="hibernate.show_sql" value="true"/>
      <property name="hibernate.format_sql" value="true"/>
      <property name="hibernate.use_sql_comments" value="true"/>
      <property name="hibernate.cache.use_query_cache" value="true"/>
      <property name="hibernate.archive.autodetection" value="class, hbm"/>     
       <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
      <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
      <property name="hibernate.connection.username" value="xxx"/>
      <property name="hibernate.connection.password" value="xxx"/>
      <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/test?createDatabaseIfNotExist=true"/>      
       <property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory"/>
       <property name="hibernate.cache.provider_configuration" value="classpath:ehcache.xml"></property>
      <property name="hibernate.use.second.level.cache" value="true"/>
      <property name="hibernate.cache.region_prefix" value="neutrino.jpa.cache"/>
      <property name="hibernate.cache.use_query_cache" value="false"/>
      <property name="hibernate.generate_statistics" value="true"/>
      <property name="hibernate.jdbc.batch_size" value="10"/>
      <property name="hibernate.order_updates" value="true"/>
      <property name="hibernate.order_inserts" value="true"/>
    <property name="org.hibernate.flushMode" value="COMMIT"/>    
  </persistence-unit>
</persistence>

这是我测试的方式

 EntityManagerFactory emf  = Persistence.createEntityManagerFactory("JPATest");
 EntityManager em = emf.createEntityManager();
 Session session = em.unwrap(Session.class);
 System.out.println("Underlying Hibernate session flushmode #######         "+session.getFlushMode());
 System.out.println("EntityManager flushmode                #######         "+em.getFlushMode());

这给了我

Underlying Hibernate session flushmode #######         COMMIT
EntityManager flushmode                #######         COMMIT

如果我省略presistence.xml中的属性，则会得到此信息

Underlying Hibernate session flushmode #######         AUTO
EntityManager flushmode                #######         AUTO