这似乎是一个非常基本的东西,我应该能够很容易地找到它,但我一直无法找到答案!
在 Spring 3.2.4 文档中,它表明供应商对 Toplink Essentials 的支持已被删除: http ://docs.spring.io/autorepo/docs/spring-framework/3.2.4.RELEASE_to_4.0.0.M3/changes /pkg_org.springframework.orm.jpa.vendor.html
但是我在任何地方都找不到使用此类的替代方法——所有使用 Spring 配置 Toplink 的示例似乎都来自 Spring 2.5 左右的时间,例如https://community.oracle.com/thread/597157
谁能告诉我现在为 Toplink JPA 实现定义 Spring 应用程序上下文的公认方法是什么?
我在用着:
- 弹簧 (4.1.4)
- Toplink Essentials (2.1-60f)
- 嵌入式 Derby DB (10.11.1.1)
- 雄猫 (8.0.18)
我当前的代码和配置设置如下所示,它可以工作——从某种意义上说,当我/help
在我的模拟 Web 应用程序中创建数据库时——但它不会自动创建我的实体表,这就是我的主要工作试图立即找到解决方案。我怀疑这是因为下面定义的只是一个简单的 JDBC 数据源,而不是一个适当的 JPA 实体管理器工厂,它可以加倍努力并自动为我创建所有实体。
在我将它迁移到 WAR 并将其部署到 Tomcat 之前,我有一个使用相同的独立 java 应用程序persistence.xml
并且它工作得很好(自动创建数据库和实体表)。现在我已经转移到一个 Web 应用程序并将 Spring 混合在一起,不是那么多:-(
基本上,我知道我需要在我的 Spring 应用程序上下文中指定create-tables
(或generateDdl=true
)某处,就像在persistence.xml
文件中所做的那样,但我不确定如果没有类之TopLinkJpaVendorAdapter
类的东西如何做到这一点(请参阅下面的注释掉的元素applicationContext.xml
) .
Spring 实体管理器工厂似乎引用了中定义的持久性单元名称persistence.xml
,但似乎没有注意到其中定义的任何其他内容 - 有没有办法让 Spring 采用这些其他设置(即 Toplink 实体管理器工厂提供程序类,以及 JDBC 详细信息等)来自persistence.xml
? 或者,如果 Spring 放弃了供应商的实现,而只使用 Eclipselink 或 Hibernate,那么它是否值得继续使用 Toplink?(顺便说一句,有谁知道为什么这个实现类首先被删除?)
META-INF/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 persistence_1_0.xsd">
<persistence-unit name="xyz-jpa" transaction-type="RESOURCE_LOCAL">
<provider>oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider</provider>
<class>org.xyz.MyDbEntity</class>
<properties>
<!--
<property name="toplink.jdbc.user" value="league"/>
<property name="toplink.jdbc.password" value="league"/>
-->
<property name="toplink.jdbc.url" value="jdbc:derby:xyz;create=true"/>
<property name="toplink.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver"/>
<property name="toplink.ddl-generation" value="create-tables"/>
</properties>
</persistence-unit>
</persistence>
WEB-INF/spring/applicationContext.xml:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<mvc:annotation-driven/>
<context:component-scan base-package="org.xyz.web" />
<!-- <context:spring-configured /> -->
<context:load-time-weaver aspectj-weaving="autodetect"/>
<!--+
| (1) Define a Spring JDBC datasource wrapper for an embedded Derby database
+-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.apache.derby.jdbc.EmbeddedDriver"/>
<property name="url" value="jdbc:derby:xyz;create=true"/>
</bean>
<!--+
| (2) Define a Spring ORM entity manager factory bean wrapper for a Toplink JPA implementation
+-->
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="xyz-jpa"/>
<property name="dataSource" ref="dataSource"/>
<!--
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.TopLinkJpaVendorAdapter">
<property name="showSql" value="true"/>
<property name="generateDdl" value="true"/>
<property name="databasePlatform" value="oracle.toplink.essentials.platform.database.DerbyPlatform"/>
</bean>
</property>
<property name="jpaProperties">
<props>
<prop key="toplink.weaving">static</prop>
<prop key="toplink.logging.level">FINEST</prop>
<prop key="toplink.ddl-generation">create-tables</prop>
<prop key="toplink.ddl-generation.output-mode">both</prop>
<prop key="toplink.drop-ddl-jdbc-file-name">generated_jpa.sql</prop>
</props>
</property>
<property name="loadTimeWeaver">
<bean class="org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader" />
</property>
-->
</bean>
<!-- (3) Define a Spring ORM transaction manager wrapper for (1) and (2) -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="helpController" class="org.xyz.web.HelpController">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
</beans>
WEB-INF/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_2_5.xsd"
version="2.5">
<display-name>XYZ</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/applicationContext.xml</param-value>
</context-param>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value></param-value> <!-- No servlet specific context config file (i.e. "dispatcher-servlet.xml") => use applicationContext.xml -->
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
META-INF/context.xml:
<Context path="/" reloadable="true">
<Loader loaderClass="org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader"/>
</Context>
org.xyz.web.HelpController:
@RestController
public class HelpController {
private EntityManagerFactory entityManagerFactory;
public HelpController() {
}
public EntityManagerFactory getEntityManagerFactory() {
return entityManagerFactory;
}
public void setEntityManagerFactory(EntityManagerFactory entityManagerFactory) {
this.entityManagerFactory = entityManagerFactory;
}
@RequestMapping( value="/help", produces=MediaType.TEXT_HTML_VALUE )
public @ResponseBody String getHelp() {
EntityManager entityManager = entityManagerFactory.createEntityManager();
return "Helpy Mc Help-Help";
}
}