Spring boot - 配置EntityManager

问题描述

我在我的项目中使用了 Google guice，现在我尝试将框架完全转换为 SpringBoot.

I was using Google guice in my project and now I tried to convert the framework to SpringBoot totally.

我为 persistence.xml 配置了 Bean，如下面的

I configured the Bean for persistence.xml like below in

@Autowired
@Bean(name = "transactionManager")
public LocalContainerEntityManagerFactoryBean entityManagerFactory()
{
    LocalContainerEntityManagerFactoryBean lEMF =  new LocalContainerEntityManagerFactoryBean();
    lEMF.setPersistenceUnitName("leaseManagementPU");
    lEMF.setPersistenceXmlLocation("persistence.xml");
    return lEMF;
}

现在我需要配置(注入)EntityManager em，来做JPA操作，比如em.persist()，em.find 等...我如何配置，也有人尝试用示例代码解释这一点

Now I need to configure(Inject) EntityManager em, to do JPA operations like em.persist(), em.find etc... How do I configure, also someone try to explain this with sample code

推荐答案

使用 Spring Boot 不需要像 persistence.xml 这样的任何配置文件.您可以使用 annotations 进行配置，只需在

With Spring Boot its not necessary to have any config file like persistence.xml. You can configure with annotations Just configure your DB config for JPA in the

spring.datasource.driverClassName=oracle.jdbc.driver.OracleDriver
spring.datasource.url=jdbc:oracle:thin:@DB...
spring.datasource.username=username
spring.datasource.password=pass

spring.jpa.database-platform=org.hibernate.dialect....
spring.jpa.show-sql=true

然后您可以使用 Spring 提供的 CrudRepository，其中您有标准的 CRUD 事务方法.在那里你也可以实现你自己的 SQL's，比如 JPQL.

Then you can use CrudRepository provided by Spring where you have standard CRUD transaction methods. There you can also implement your own SQL's like JPQL.

@Transactional
public interface ObjectRepository extends CrudRepository<Object, Long> {
...
}

如果您仍然需要使用Entity Manager，您可以创建另一个类.

And if you still need to use the Entity Manager you can create another class.

public class ObjectRepositoryImpl implements ObjectCustomMethods{

    @PersistenceContext
    private EntityManager em;

}

这应该在你的 pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.2.5.RELEASE</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>4.3.11.Final</version>
    </dependency>
</dependencies>

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