如何使用XML配置Spring Data JPA

Question

我正在阅读《Professional Java for Web Applications - Nicholas S. Williams》这本书。书中的示例给出了Spring Data JPA的此配置：

@Bean
public DataSource customerSupportDataSource()
{
    JndiDataSourceLookup lookup = new JndiDataSourceLookup();
    return lookup.getDataSource("jdbc/CustomerSupport");
}

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean()
{
    Map<String, Object> properties = new Hashtable<>();
    properties.put("javax.persistence.schema-generation.database.action",
            "none");
    properties.put("hibernate.ejb.use_class_enhancer", "true");

    HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
    adapter.setDatabasePlatform("org.hibernate.dialect.MySQL5InnoDBDialect");

    LocalContainerEntityManagerFactoryBean factory =
            new LocalContainerEntityManagerFactoryBean();
    factory.setJpaVendorAdapter(adapter);
    factory.setDataSource(this.customerSupportDataSource());
    factory.setPackagesToScan("com.wrox.site.entities",
            "com.wrox.site.converters");
    factory.setSharedCacheMode(SharedCacheMode.ENABLE_SELECTIVE);
    factory.setValidationMode(ValidationMode.NONE);
    factory.setLoadTimeWeaver(this.loadTimeWeaver); // TODO: remove when SPR-10856 fixed
    factory.setJpaPropertyMap(properties);
    return factory;
}

@Bean
public PlatformTransactionManager jpaTransactionManager()
{
    return new JpaTransactionManager(
            this.entityManagerFactoryBean().getObject()
    );
}

但是我一直在使用XML进行配置，我无法想出如何仅使用XML来进行翻译，到目前为止我有以下内容：

<jee:jndi-lookup id="myDataSource" jndi-name="java:comp/env/jdbc/test"/>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="myEmf" />
</bean>

<bean id="myEmf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="myDataSource" />
    <property name="packagesToScan" value="com.test" />
</bean>

有人可以指导我如何转换这个吗？

谢谢

- Navid

Answer 1

如果您想使用XML配置来配置Spring Data JPA（并使用书中描述的配置），则必须按照以下步骤进行：

1. 配置数据源bean。
2. 配置实体管理器工厂bean。
3. 配置事务管理器bean。
4. 启用基于注释的事务管理。
5. 配置Spring Spring Data JPA。

应用程序上下文配置（applicationContext-persistence.xml）文件如下所示：

<?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:jpa="http://www.springframework.org/schema/data/jpa"
  xmlns:tx="http://www.springframework.org/schema/tx"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/data/jpa 
    http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.1.xsd">

  <!-- Configure the data source bean -->
  <jee:jndi-lookup id="dataSource" jndi-name="java:comp/env/jdbc/CustomerSupport"/>

  <!-- Create default configuration for Hibernate -->
  <bean id="hibernateJpaVendorAdapter" 
    class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>

  <!-- Configure the entity manager factory bean -->
  <bean id="entityManagerFactory" 
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaVendorAdapter" ref="hibernateJpaVendorAdapter"/>
    <!-- Set JPA properties -->
    <property name="jpaProperties">
      <props>
        <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
        <prop key="javax.persistence.schema-generation.database.action">none</prop>
        <prop key="hibernate.ejb.use_class_enhancer">true</prop>
      </props>
    </property>
    <!-- Set base package of your entities -->
    <property name="packagesToScan" value="foo.bar.model"/>
    <!-- Set share cache mode -->
    <property name="sharedCacheMode" value="ENABLE_SELECTIVE"/>
    <!-- Set validation mode -->
    <property name="validationMode" value="NONE"/>
  </bean>

  <!-- Configure the transaction manager bean -->
  <bean id="transactionManager" 
    class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory"/>
  </bean>

  <!-- Enable annotation driven transaction management -->
  <tx:annotation-driven/>

  <!-- 
    Configure Spring Data JPA and set the base package of the 
    repository interfaces 
  -->
  <jpa:repositories base-package="foo.bar.repository"/>
</beans>

- pkainulainen

---

谢谢pkainulainen，我已经准备好了所有的上下文和XML文件。我想要的是将给定的Java配置精确地翻译成XML。例如：public DataSource customerSupportDataSource() { JndiDataSourceLookup lookup = new JndiDataSourceLookup(); return lookup.getDataSource("jdbc/CustomerSupport"); } 相应的XML代码如下：<jee:jndi-lookup id="myDataSource" jndi-name="java:comp/env/jdbc/CustomerSupport"/> - Navnav

不客气。我已经更新了答案以匹配书中描述的配置。虽然我没有测试，但应该可以工作。还有一件事，配置类是否有一个loadTimeWeaver字段？如果有的话，你应该将完整的Java配置类添加到你的问题中。如果你这样做，我也可以将加载时间编织器添加到XML配置中。另外，请注意，XML配置使用旧的模式版本。你可能也想要更新它们。 - pkainulainen

你说得对，现在我需要LoadTimeWeaver，但是书中的源代码缺失了它，有什么建议如何设置它吗？ - Navnav

很抱歉回复这个邮件花费了我一些时间（它被遗忘在我的收件箱中了）。无论如何，我只会使用默认的LoadTimeWeaver（不进行配置）。 - pkainulainen

@pkainulainen 我试图将您的答案适应到我的问题上：Spring Data配置 - 找不到hibernate.properties，但我无法做到 - 是否可以为嵌入式数据源(jdbc:embedded-database)而不是jee:jndi-lookup进行配置？ - Radek Anuszewski

@pkainulainen 我该如何在xml中指定<Provider>？ - Naxi

Answer 2

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan" value="com.thought.service.*" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
            <property name="generateDdl" value="true" />
            <property name="showSql" value="false" />
            <property name="database" value="MYSQL" />
        </bean>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.temp.use_jdbc_metadata_defaults">false</prop>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
        </props>
    </property>
</bean>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
    
<bean id="transactionSupport" class="com.thought.service.common.database.TransactionSupport" />
        
<bean id="transactionTemplate" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
    <property name="proxyInterfaces">
        <list> 
    <value>com.thought.service.common.database.TransactionTemplate</value>
        </list>
    </property>
    <!-- <property name="proxyTargetClass" value="false" />   -->
    <property name="transactionManager" ref="transactionManager" />
    <property name="target" ref="transactionSupport" />
    <property name="transactionAttributes">
        <props>
            <prop key="save">PROPAGATION_REQUIRES_NEW,-java.lang.Exception</prop>
        </props>
    </property>
</bean>

public class TransactionSupport implements TransactionTemplate {
    
    public void save(PersistenceHandler persistanceHandler, ModelTemplate model) throws Exception {
        persistanceHandler.save(model);
    }
    
}

public interface TransactionTemplate {
    
    public void save(PersistenceHandler persistanceHandler, ModelTemplate model) throws Exception;
            
}

public abstract class PersistenceHandler {
        
    /**
     * Method to implement the actual transaction controlled database operations
     * @param model {@code ModelTemplate}
     * 
     * @throws Exception
     */
    public abstract void save(ModelTemplate model) throws Exception;
                
}

- Babu Selvam

---

在您的帖子中添加一些解释。请查看此处以获取更多信息：http://stackoverflow.com/help/how-to-answer - Shashanth