Question

我必须使用Hibernate / JPA在我的项目（Web应用程序）上映射三个数据库，所以我的问题是如何配置persistance.xml以支持三个连接这是我的文件：的 persistance.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" 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">
<persistence-unit name="JiraMapPU" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>DTOKpi.AssociationKpiProfil</class>  //from  database1
<class>DTOKpi.Kpi</class>                  //database1
<class>DTOKpi.ProfilUser</class>          //  database1
<class>DTOJIRA.Resolution</class>         //  database2
<class>DTOJIRA.Project</class>           //  database2
<class>DTOJIRA.Issuestatus</class>
<class>DTOJIRA.Jiraissue</class>
<class>DTOJIRA.Priority</class>
<class>DTOJIRA.Component</class>
<class>DTOJIRA.Issuetype</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
  <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/jiradb"/>
  <property name="javax.persistence.jdbc.password" value="root"/>
  <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
  <property name="javax.persistence.jdbc.user" value="root"/>
</properties>

我的hibernate.cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD  3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/jiradb</property>
<property name="hibernate.connection.username">root</property>
<mapping resource="DTOTest/issuestatus.hbm.xml"/>
<mapping resource="hibernate.hbm.xml"/>
</session-factory>
</hibernate-configuration>

我发现此链接很有用：How do I connect to multiple databases using JPA?但我无法理解第二步

Answer 1

如果你的三个数据库是相同的，我想它会起作用，但如果没有，我认为你应该为每个数据库创建一个地图文件。

同时映射三个数据库

1 个答案: