使用@PersistenceContext插入EntityManager

我们目前正在使用 EntityManager 就像下面一样。我们想从 @PersistenceUnit 到 @PersistenceContext 对于实体管理器。我们怎么用这个呢 @Inject 机制?

持久性.xml:

<persistence-unit name="my-data-source" transaction-type="JTA">
    <jta-data-source>java:/foo/model</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
        <property name="hibernate.show_sql" value="${hibernate.show_sql:false}"/>
        <property name="hibernate.format_sql" value="true" />
        <property name="hibernate.use_sql_comments" value="true" />
        <property name="hibernate.order_inserts" value="true" />
        <property name="hibernate.order_updates" value="true" />
        <property name="hibernate.jdbc.batch_versioned_data" value="true" />
        <property name="hibernate.jdbc.batch_size" value="30" />
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL57InnoDBDialect" />
    </properties>
</persistence-unit>

这就是我们获得实体经理的方法:

@Stateless
public class EntityManagerProvider {

    @PersistenceUnit(unitName = "my-data-source")
    private EntityManagerFactory emFactory;

    @Produces
    @Default
    public EntityManager getDefaultEntityManager() {
        return emFactory.createEntityManager();
    }

}

在应用程序中,我们像这样注入实体管理器:

@Inject
private EntityManager entityManager;