Spring+Hibernate+JPA的多数据库
Posted
技术标签:
【中文标题】Spring+Hibernate+JPA的多数据库【英文标题】：Multiple database with Spring+Hibernate+JPA 【发布时间】：2010-12-26 13:21:33 【问题描述】：我正在尝试配置 Spring+Hibernate+JPA 以使用两个数据库（mysql 和 MSSQL）。
我的数据源-context.xml：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util">
<!--
Data Source config
-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close" p:driverClassName="$local.jdbc.driver" p:url="$local.jdbc.url"
p:username="$local.jdbc.username" p:password="$local.jdbc.password">
</bean>
<bean id="dataSourceRemote" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close" p:driverClassName="$remote.jdbc.driver"
p:url="$remote.jdbc.url" p:username="$remote.jdbc.username"
p:password="$remote.jdbc.password" />
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"
p:entity-manager-factory-ref="entityManagerFactory" />
<!--
JPA config
-->
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="persistenceUnitManager"
class="org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager">
<property name="persistenceXmlLocations">
<list value-type="java.lang.String">
<value>classpath*:config/persistence.local.xml</value>
<value>classpath*:config/persistence.remote.xml</value>
</list>
</property>
<property name="dataSources">
<map>
<entry key="localDataSource" value-ref="dataSource" />
<entry key="remoteDataSource" value-ref="dataSourceRemote" />
</map>
</property>
<property name="defaultDataSource" ref="dataSource" />
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
p:showSql="true" p:generateDdl="true">
</bean>
</property>
<property name="persistenceUnitManager" ref="persistenceUnitManager" />
<property name="persistenceUnitName" value="localjpa"/>
</bean>
<bean
class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
</beans>
每个persistence.xml 包含一个单元，如下所示：
<persistence-unit name="remote" transaction-type="RESOURCE_LOCAL">
<properties>
<property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.DefaultNamingStrategy" />
<property name="hibernate.dialect" value="$remote.hibernate.dialect" />
<property name="hibernate.hbm2ddl.auto" value="$remote.hibernate.hbm2ddl.auto" />
</properties>
</persistence-unit>
PersistenceUnitManager 导致以下异常：
无法解析对 bean 的引用 设置时的“persistenceUnitManager” 豆属性 'persistenceUnitManager';嵌套的 例外是 org.springframework.beans.factory.BeanCreationException： 创建具有名称的 bean 时出错 'persistenceUnitManager' 定义在 类路径资源 [配置/数据源上下文.xml]： bean初始化失败；嵌套的 例外是 org.springframework.beans.TypeMismatchException： 未能转换的属性值 键入 [java.util.ArrayList] 为必需 为属性键入 [java.lang.String] 'persistenceXmlLocation';嵌套的 例外是 java.lang.IllegalArgumentException： 无法转换类型的值 [java.util.ArrayList] 到所需类型 [java.lang.String] 用于属性 'persistenceXmlLocation'：没有匹配 找到编辑器或转换策略
如果只留下一个没有列表的 persistence.xml，每个都可以正常工作 但我需要 2 个单位...
我还尝试找到在 Spring+Hibernate 上下文中使用两个数据库的替代解决方案，因此我将不胜感激。
改成persistenceXmlLocations后出现新错误：
在 classpath:config/persistence.local.xml, classpath:config/persistence.remote.xml 中没有定义单个默认持久性单元
更新：
我添加了 persistenceUnitName，它可以工作，但只有一个单元，仍然需要帮助。
更新：
我更改了配置文件： 数据源-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close" p:driverClassName="$local.jdbc.driver" p:url="$local.jdbc.url"
p:username="$local.jdbc.username" p:password="$local.jdbc.password">
</bean>
<bean id="dataSourceRemote" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close" p:driverClassName="$remote.jdbc.driver"
p:url="$remote.jdbc.url" p:username="$remote.jdbc.username"
p:password="$remote.jdbc.password">
</bean>
<bean
class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor">
<property name="defaultPersistenceUnitName" value="pu1" />
</bean>
<bean id="persistenceUnitManager"
class="org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager">
<property name="persistenceXmlLocation" value="$persistence.xml.location" />
<property name="defaultDataSource" ref="dataSource" /> <!-- problem -->
<property name="dataSources">
<map>
<entry key="local" value-ref="dataSource" />
<entry key="remote" value-ref="dataSourceRemote" />
</map>
</property>
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
p:showSql="true" p:generateDdl="true">
</bean>
</property>
<property name="persistenceUnitManager" ref="persistenceUnitManager" />
<property name="persistenceUnitName" value="pu1" />
<property name="dataSource" ref="dataSource" />
</bean>
<bean id="entityManagerFactoryRemote"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
p:showSql="true" p:generateDdl="true">
</bean>
</property>
<property name="persistenceUnitManager" ref="persistenceUnitManager" />
<property name="persistenceUnitName" value="pu2" />
<property name="dataSource" ref="dataSourceRemote" />
</bean>
<tx:annotation-driven />
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"
p:entity-manager-factory-ref="entityManagerFactory" />
<bean id="transactionManagerRemote" class="org.springframework.orm.jpa.JpaTransactionManager"
p:entity-manager-factory-ref="entityManagerFactoryRemote" />
</beans>
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_1_0.xsd"
version="1.0">
<persistence-unit name="pu1" transaction-type="RESOURCE_LOCAL">
<properties>
<property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.DefaultNamingStrategy" />
<property name="hibernate.dialect" value="$local.hibernate.dialect" />
<property name="hibernate.hbm2ddl.auto" value="$local.hibernate.hbm2ddl.auto" />
</properties>
</persistence-unit>
<persistence-unit name="pu2" transaction-type="RESOURCE_LOCAL">
<properties>
<property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.DefaultNamingStrategy" />
<property name="hibernate.dialect" value="$remote.hibernate.dialect" />
<property name="hibernate.hbm2ddl.auto" value="$remote.hibernate.hbm2ddl.auto" />
</properties>
</persistence-unit>
</persistence>
现在它构建了两个 entityManagerFactory，但都是用于 Microsoft SQL Server
[main] INFO org.hibernate.ejb.Ejb3Configuration - Processing PersistenceUnitInfo [
name: pu1
...]
[main] INFO org.hibernate.cfg.SettingsFactory - RDBMS: Microsoft SQL Server
[main] INFO org.hibernate.ejb.Ejb3Configuration - Processing PersistenceUnitInfo [
name: pu2
...]
[main] INFO org.hibernate.cfg.SettingsFactory - RDBMS: Microsoft SQL Server (but must MySQL)
我建议，仅使用 dataSource，dataSourceRemote（无替换）是行不通的。这是我的最后一个问题。
【问题讨论】：
【参考方案1】：您需要使用persistenceXmlLocations 属性（注意复数）而不是persistenceXmlLocation。它是一个字符串数组，所以它会从列表中自动转换：
<bean id="persistenceUnitManager"
class="org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager">
<property name="persistenceXmlLocations"><list>
<value>classpath*:config/persistence.local.xml</value>
<value>classpath*:config/persistence.remote.xml</value>
</list></property>
...
更新（基于编辑）
您的 entityManagerFactory 未指定 persistenceUnitName 属性。您必须明确地这样做，因为您定义了多个持久性单元，entityManagerFactory 必须知道要使用哪一个。
【讨论】：
如果和这个有关，也许你可以更新你的问题，我来看看。如果没有直接相关，最好发布一个新问题。 好的，所以如果我明确设置persistenceUnitName，它会起作用，但只能使用一个单元。如何在应用程序中切换单位？ 您不能“切换”它们。但是，您可以创建多个entityManagerFactory 实例 - 每个持久性单元一个。然后，您可以在代码中的 PersistenceContext 注释上指定 unitName，以选择哪个工厂将生成将被注入的实体管理器。
大家好，我阅读了上面的代码，因此创建多个 org.springframework.orm.jpa.JpaTransactionManager 并使用 @transactional("name") 是合法的？【参考方案2】：
贾斯汀，3 号可以用更标准的方式完成，如下所示：
在您的 Spring 上下文中：
<context:annotation-config />
在 Spring 管理的 DAO 中（注意 unitName 属性）：
@PersistenceContext(unitName = "pu1"`) protected EntityManager entityManager;
这样，与名为“pu1”的持久性单元相对应的正确实例化的 EntityManager 将被注入相应的 DAO。
【讨论】：
我不相信 Spring 支持版本 3 之前的 unitName 属性，仅供参考。【参考方案3】：如果您遵循本教程， http://www.javacodegeeks.com/2010/05/jboss-42x-spring-3-jpa-hibernate.html您可以进行以下更改以访问两个不同的数据库：
-
persistence.xml，为您的第二个数据库定义第二个持久性单元。
spring.xml，以不同的名称定义第二个 entityManagerFactory bean，让我们说“entityManagerFactoryDB2”并将其配置为使用第二个数据库的持久单元。
对于您要访问第二个数据库的每个 DAO，包括以下内容：
@Autowired
private EntityManagerFactory entityManagerFactoryDB2;
@PostConstruct
public void init()
super.setEntityManagerFactory(entityManagerFactoryDB2);
就是这样！
在 Spring 服务类上，照常使用 DAO！
【讨论】：
【参考方案4】：我通过这种方式解决了问题（如何使用spring和Hibernate连接多个数据库），希望对您有所帮助:) 注意： 我已经添加了相关代码，请在下面提到的代码中使用的 impl 的帮助下制作 dao。
**web.xml**
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>MultipleDatabaseConnectivityInSpring</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/dispatcher-servlet.xml
</param-value>
</context-param>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>30</session-timeout>
</session-config>
</web-app>
**persistence.xml**
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
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_1_0.xsd">
<persistence-unit name="localPersistenceUnitOne"
transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>in.india.entities.CustomerDetails</class>
<exclude-unlisted-classes />
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
<property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
<property name="hibernate.jdbc.batch_size" value="0" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/shankar?sslmode=require" />
<property name="hibernate.connection.username" value="username" />
<property name="hibernate.connection.password" value="password" />
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>
</persistence-unit>
<persistence-unit name="localPersistenceUnitTwo"
transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>in.india.entities.CompanyDetails</class>
<exclude-unlisted-classes />
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
<property name="hibernate.connection.driver_class" value="org.postgresql.Driver" />
<property name="hibernate.jdbc.batch_size" value="0" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.connection.url" value="jdbc:postgresql://localhost:5432/shankarTwo?sslmode=require" />
<property name="hibernate.connection.username" value="username" />
<property name="hibernate.connection.password" value="password" />
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>
</persistence-unit>
</persistence>
**dispatcher-servlet**
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:task="http://www.springframework.org/schema/task" xmlns:p="http://www.springframework.org/schema/p"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:util="http://www.springframework.org/schema/util"
default-autowire="byName"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<!-- Configure messageSource -->
<mvc:annotation-driven />
<context:component-scan base-package="in.india.*" />
<bean id="messageResource"
class="org.springframework.context.support.ResourceBundleMessageSource"
autowire="byName">
<property name="basename" value="messageResource"></property>
</bean>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<bean id="entityManagerFactoryOne"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
autowire="constructor">
<property name="persistenceUnitName" value="localPersistenceUnitOne" />
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ResourceBundleMessageSource"
autowire="byName">
<property name="basename" value="messageResource" />
</bean>
<bean id="entityManagerFactoryTwo"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
autowire="constructor">
<property name="persistenceUnitName" value="localPersistenceUnitTwo" />
</bean>
<bean id="manager1" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactoryOne" />
</bean>
<bean id="manager2" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactoryTwo" />
</bean>
<tx:annotation-driven transaction-manager="manager1" />
<tx:annotation-driven transaction-manager="manager2" />
<!-- declare dependies here -->
<bean class="in.india.service.dao.impl.CustomerServiceImpl" />
<bean class="in.india.service.dao.impl.CompanyServiceImpl" />
<!-- Configure MVC annotations -->
<bean
class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<bean
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
</beans>
**java class to persist into one database**
package in.india.service.dao.impl;
import in.india.entities.CompanyDetails;
import in.india.service.CompanyService;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.springframework.transaction.annotation.Transactional;
public class CompanyServiceImpl implements CompanyService
@PersistenceContext(unitName = "entityManagerFactoryTwo")
EntityManager entityManager;
@Transactional("manager2")
@Override
public boolean companyService(CompanyDetails companyDetails)
boolean flag = false;
try
entityManager.persist(companyDetails);
flag = true;
catch (Exception e)
flag = false;
return flag;
**java class to persist in another database**
package in.india.service.dao.impl;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.springframework.transaction.annotation.Transactional;
import in.india.entities.CustomerDetails;
import in.india.service.CustomerService;
public class CustomerServiceImpl implements CustomerService
@PersistenceContext(unitName = "localPersistenceUnitOne")
EntityManager entityManager;
@Override
@Transactional(value = "manager1")
public boolean customerService(CustomerDetails companyData)
boolean flag = false;
entityManager.persist(companyData);
return flag;
**customer.jsp**
<%@page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<center>
<h1>SpringWithMultipleDatabase's</h1>
</center>
<form:form method="GET" action="addCustomer.htm" modelAttribute="customerBean" >
<table>
<tr>
<td><form:label path="firstName">First Name</form:label></td>
<td><form:input path="firstName" /></td>
</tr>
<tr>
<td><form:label path="lastName">Last Name</form:label></td>
<td><form:input path="lastName" /></td>
</tr>
<tr>
<td><form:label path="emailId">Email Id</form:label></td>
<td><form:input path="emailId" /></td>
</tr>
<tr>
<td><form:label path="profession">Profession</form:label></td>
<td><form:input path="profession" /></td>
</tr>
<tr>
<td><form:label path="address">Address</form:label></td>
<td><form:input path="address" /></td>
</tr>
<tr>
<td><form:label path="age">Age</form:label></td>
<td><form:input path="age" /></td>
</tr>
<tr>
<td><input type="submit" value="Submit"/></td>
</tr>
</table>
</form:form>
</body>
</html>
**company.jsp**
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>ScheduleJobs</title>
</head>
<body>
<center><h1>SpringWithMultipleDatabase's</h1></center>
<form:form method="GET" action="addCompany.htm" modelAttribute="companyBean" >
<table>
<tr>
<td><form:label path="companyName">Company Name</form:label></td>
<td><form:input path="companyName" /></td>
</tr>
<tr>
<td><form:label path="companyStrength">Company Strength</form:label></td>
<td><form:input path="companyStrength" /></td>
</tr>
<tr>
<td><form:label path="companyLocation">Company Location</form:label></td>
<td><form:input path="companyLocation" /></td>
</tr>
<tr>
<td>
<input type="submit" value="Submit"/>
</td>
</tr>
</table>
</form:form>
</body>
</html>
**index.jsp**
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Home</title>
</head>
<body>
<center><h1>Multiple Database Connectivity In Spring sdfsdsd</h1></center>
<a href='customerRequest.htm'>Click here to go on Customer page</a>
<br>
<a href='companyRequest.htm'>Click here to go on Company page</a>
</body>
</html>
**success.jsp**
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>ScheduleJobs</title>
</head>
<body>
<center><h1>SpringWithMultipleDatabase</h1></center>
<b>Successfully Saved</b>
</body>
</html>
**CompanyController**
package in.india.controller;
import in.india.bean.CompanyBean;
import in.india.entities.CompanyDetails;
import in.india.service.CompanyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class CompanyController
@Autowired
CompanyService companyService;
@RequestMapping(value = "/companyRequest.htm", method = RequestMethod.GET)
public ModelAndView addStudent(ModelMap model)
CompanyBean companyBean = new CompanyBean();
model.addAttribute(companyBean);
return new ModelAndView("company");
@RequestMapping(value = "/addCompany.htm", method = RequestMethod.GET)
public ModelAndView companyController(@ModelAttribute("companyBean") CompanyBean companyBean, Model model)
CompanyDetails companyDetails = new CompanyDetails();
companyDetails.setCompanyLocation(companyBean.getCompanyLocation());
companyDetails.setCompanyName(companyBean.getCompanyName());
companyDetails.setCompanyStrength(companyBean.getCompanyStrength());
companyService.companyService(companyDetails);
return new ModelAndView("success");
**CustomerController**
package in.india.controller;
import in.india.bean.CustomerBean;
import in.india.entities.CustomerDetails;
import in.india.service.CustomerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class CustomerController
@Autowired
CustomerService customerService;
@RequestMapping(value = "/customerRequest.htm", method = RequestMethod.GET)
public ModelAndView addStudent(ModelMap model)
CustomerBean customerBean = new CustomerBean();
model.addAttribute(customerBean);
return new ModelAndView("customer");
@RequestMapping(value = "/addCustomer.htm", method = RequestMethod.GET)
public ModelAndView customerController(@ModelAttribute("customerBean") CustomerBean customer, Model model)
CustomerDetails customerDetails = new CustomerDetails();
customerDetails.setAddress(customer.getAddress());
customerDetails.setAge(customer.getAge());
customerDetails.setEmailId(customer.getEmailId());
customerDetails.setFirstName(customer.getFirstName());
customerDetails.setLastName(customer.getLastName());
customerDetails.setProfession(customer.getProfession());
customerService.customerService(customerDetails);
return new ModelAndView("success");
**CompanyDetails Entity**
package in.india.entities;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity
@Table(name = "company_details")
public class CompanyDetails
@Id
@SequenceGenerator(name = "company_details_seq", sequenceName = "company_details_seq", initialValue = 1, allocationSize = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "company_details_seq")
@Column(name = "company_details_id")
private Long companyDetailsId;
@Column(name = "company_name")
private String companyName;
@Column(name = "company_strength")
private Long companyStrength;
@Column(name = "company_location")
private String companyLocation;
public Long getCompanyDetailsId()
return companyDetailsId;
public void setCompanyDetailsId(Long companyDetailsId)
this.companyDetailsId = companyDetailsId;
public String getCompanyName()
return companyName;
public void setCompanyName(String companyName)
this.companyName = companyName;
public Long getCompanyStrength()
return companyStrength;
public void setCompanyStrength(Long companyStrength)
this.companyStrength = companyStrength;
public String getCompanyLocation()
return companyLocation;
public void setCompanyLocation(String companyLocation)
this.companyLocation = companyLocation;
**CustomerDetails Entity**
package in.india.entities;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity
@Table(name = "customer_details")
public class CustomerDetails
@Id
@SequenceGenerator(name = "customer_details_seq", sequenceName = "customer_details_seq", initialValue = 1, allocationSize = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "customer_details_seq")
@Column(name = "customer_details_id")
private Long customerDetailsId;
@Column(name = "first_name ")
private String firstName;
@Column(name = "last_name ")
private String lastName;
@Column(name = "email_id")
private String emailId;
@Column(name = "profession")
private String profession;
@Column(name = "address")
private String address;
@Column(name = "age")
private int age;
public Long getCustomerDetailsId()
return customerDetailsId;
public void setCustomerDetailsId(Long customerDetailsId)
this.customerDetailsId = customerDetailsId;
public String getFirstName()
return firstName;
public void setFirstName(String firstName)
this.firstName = firstName;
public String getLastName()
return lastName;
public void setLastName(String lastName)
this.lastName = lastName;
public String getEmailId()
return emailId;
public void setEmailId(String emailId)
this.emailId = emailId;
public String getProfession()
return profession;
public void setProfession(String profession)
this.profession = profession;
public String getAddress()
return address;
public void setAddress(String address)
this.address = address;
public int getAge()
return age;
public void setAge(int age)
this.age = age;
【讨论】：
【参考方案5】：查看此 wiki 页面 http://code.google.com/p/gwt-spring-jpa-lucene/wiki/PersistenceUnitSetup，详细说明如何使用 persistenceXmlLocations 和 DAO 中的注释配置 spring
【讨论】：
【参考方案6】：-
为每个持久化单元创建多个entityManagerFactory。
为@PersistenceContext 指定unitName 属性
在那些将被注入的 entityManagerFactories 之间切换
【讨论】：
以上是关于Spring+Hibernate+JPA的多数据库的主要内容，如果未能解决你的问题，请参考以下文章
使用 JPA 和 Hibernate 提供程序的多对多关系不会创建主键
Spring、Spring Security、JPA、MySQL、Hibernate 配置