如何在JBOSS上使用EJB 3与持久性单元



我有一个jboss as,在此服务器上有一个独立的.xml文件,那里也有几个属性,我的数据源也是如此,因此如何在standalone.xml文件中组合数据源我想添加到EJB?

的持久性单元

只需添加 <jta-data-source>java:/ExampleDS</jta-data-source>将您的dataSource jndi-name提供到persistence.xml。

dataSource的示例:

<datasource jndi-name="java:/ExampleDS" pool-name="ExampleDS" enabled="true" use-java-context="true">
                    <connection-url>jdbc:h2:mem:test;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE</connection-url>
                    <driver>h2</driver>
                    <security>
                        <user-name>sa</user-name>
                        <password>sa</password>
                    </security>
                </datasource>

persistence.xml引用数据源检查的示例:

<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="example">
      <jta-data-source>java:/ExampleDS</jta-data-source>
      <properties>
         <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
         <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
      </properties>
   </persistence-unit>
</persistence>

示例在您的EJB3中注入持久性单元:

@Stateless
public class MyEJB {
    @PersistenceContext(unitName="example") protected EntityManager entityManager;
    public void createEmployee(String fName, String lName) {
        Employee employee  = new Employee();
        employee.setFirstName(fName);
        employee.setLastName(lName);
        entityManager.persist(employee);
    }
...
}

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