Question

我有两个数据源和两个entityManagerFactory实例。我试图使用3.1的新功能（使用packagesToScan属性引导JPA entityManagerFactory而不使用persistence.xml。）

为了使用正确的实体管理器工厂实例，我必须区分使用持久性单元名称并在persistence.xml中定义PU名称正在停止弹簧包扫描功能。

如何在使用packagesToScan功能时提供PU名称？

我的问题是Is there a way to give persistenceUnitName for Spring's LocalContainerEntityManagerFactoryBean without persistence.xml?

的更多重复

我找不到上述帖子的答案或评论。所以转发为新问题。

Answer 1

如果我正确理解您的问题，您希望设置persistenceUnit支持EntityManagerFactory的名称，在没有persistence.xml的情况下定义？

当您声明entityManagerFactory时，您可以设置persistenceUnitName属性。例如：

<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
  <property name="dataSource" ref="dataSource"/>

  <property name="persistenceUnitName" value="yourPersistenceUnitName"/>

  <property name="jpaVendorAdapter" ref="jpaVendorAdapter"/>
  <property name="packagesToScan">
    <list>
      <value>..</value>
      ...
    </list>
  </property>
</bean>

Answer 2

是的，你可以。这是一个使用Spring注释配置的例子

我发现最好将每个数据源组织到一个不同的包中我的包结构是：

datasource
    |__ converters         <-- holds any custom attribute converters for JPA
    |__ default            <-- for default datasource
    |       |__ model      <-- contains entities for default datasource
    |       |__ repository <-- contains repositories for default datasource
    |__ anotherdatasource  <-- for second datasource
            |__ model      <-- contains entities for second datasource
            |__ repository <-- contains repositories for second datasource

选择一个数据源作为默认值，并为其创建一个配置类...

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "entityManagerFactory", basePackages = { "com.example.datasource.default.repository" })
public class JpaDefaultDatasourceConfig {

    @Primary
    @Bean(name = "dataSource")
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean(name = "entityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder, @Qualifier("dataSource") DataSource dataSource) {
        return builder.dataSource(dataSource).packages("com.example.datasource.default.model", "com.example.datasource.converters").persistenceUnit("mydefault").build();
    }

    @Primary
    @Bean(name = "transactionManager")
    public PlatformTransactionManager transactionManager(@Qualifier("entityManagerFactory") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }
}

然后为每个后续数据源创建另一个配置类，沿着...... （注意：使用包来分隔实体/存储库扫描和整个使用的命名约定）< / em>的

@Configuration @EnableTransactionManagement @EnableJpaRepositories(entityManagerFactoryRef = "anotherEntityManagerFactory", transactionManagerRef = "anotherTransactionManager", basePackages = { "com.example.datasource.anotherdatasource.repository" }) public class JpaAnotherDatasourceConfig { @Bean(name = "anotherDataSource") @ConfigurationProperties(prefix = "another.datasource") public DataSource anotherDataSource() { return DataSourceBuilder.create().build(); } @Bean(name = "anotherEntityManagerFactory") public LocalContainerEntityManagerFactoryBean anotherEntityManagerFactory(EntityManagerFactoryBuilder builder, @Qualifier("anotherDataSource") DataSource anotherDataSource) { return builder.dataSource(anotherDataSource).packages("com.example.datasource.anotherdatasource.model", "com.example.datasource.converters").persistenceUnit("anotherName").build(); } @Bean(name = "anotherTransactionManager") public PlatformTransactionManager anotherTransactionManager(@Qualifier("anotherEntityManagerFactory") EntityManagerFactory anotherEntityManagerFactory) { return new JpaTransactionManager(anotherEntityManagerFactory); } }

您可以使用配置前缀配置每个数据源。对于上面的两个示例，您可以使用
配置它们
<强> application.yml

## JPA configuration # This is the configuration for default datasource created by spring spring: datasource: url: jdbc:mysql://localhost/default username: foo password: bar driverClassName: com.mysql.jdbc.Driver test-on-borrow: true test-while-idle: true validation-query: select 1; # maxActive: 1 # This is the configuration for an additional datasource which we will create ourselves another: datasource: url: jdbc:mysql://localhost/another username: foo password: bar driverClassName: com.mysql.jdbc.Driver test-on-borrow: true test-while-idle: true validation-query: select 1;

你现在不必担心持久性单位的名称（虽然我们确实命名了它们），因为我们已经仔细分离了实体经理，只看他们的实体/存储库你可以简单地注入适用的存储库并使用它，而不必担心它获取错误的数据源。如果您确实需要持久性单元，您可以通过名称@PersistenceUnit(name = "anotherDatasource")
来询问它

在packagesToScan属性时如何提及persistenceUnitName

2 个答案: