• 1.首先需要配置服务器glassfish的数据库连接池，又叫资源连接池：

• 2.然后配置persistence unit：

  • 整个Persistence unit的格式如下：

    
    
    
    

    -配置实例：

<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="RealEstateAgencyPU" transaction-type="JTA">
    <jta-data-source>jdbc/RealEstateDataSource</jta-data-source>
    <class>fit5042.tutex.repository.entities.ContactPerson</class>
    <class>fit5042.tutex.repository.entities.Property</class>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <properties>      
      <property name="javax.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

• 其中：

  
  
  
  

  就是这条：