spring-boot – Spring boot – 配置EntityManager

@Autowired
@Bean(name = "transactionManager")
public LocalContainerEntityManagerFactoryBean entityManagerFactory()
{
 LocalContainerEntityManagerFactoryBean lEMF = new LocalContainerEntityManagerFactoryBean();
 lEMF.setPersistenceUnitName("leaseManagementPU");
 lEMF.setPersistenceXmlLocation("persistence.xml");
 return lEMF;
} 
Now I need to configure (inject) EntityManager em to perform JPA operations like em.persist(), em.find, etc... How do I configure it, and some people try to explain this with sample code
 

spring.datasource.driverClassName=oracle.jdbc.driver.OracleDriver
 spring.datasource.url=jdbc:oracle:thin:@DB...
spring.datasource.username=username
spring.datasource.password=pass< br />
spring.jpa.database-platform=org.hibernate.dialect....
spring.jpa.show-sql=true

@Transactional
public interface ObjectRepository extends CrudRepository  {
...
}

public class ObjectRepositoryImpl implements ObjectCustomMethods{

 @PersistenceContext
 private EntityManager em;

}

 org.springframework.boot
 spring-boot-starter- parent
 1.2.5.RELEASE
 

 

 
 org.springframework.boot
 spring-boot-starter-data-jpa
 
< br />
 
 org.springframework
 spring-orm
 
 
 < groupId>org.hibernate
 hibernate-core
 4.3.11.Final
 

I use Google guice in my project, and now I try to fully convert the framework to SpringBoot.

I configured Bean for persistence.xml , As shown below

@Autowired
@Bean(name = "transactionManager")
public LocalContainerEntityManagerFactoryBean entityManagerFactory()
{
 LocalContainerEntityManagerFactoryBean lEMF = new LocalContainerEntityManagerFactoryBean();
 lEMF.setPersistenceUnitName("leaseManagementPU");
 lEMF.setPersistenceXmlLocation("persistence.xml");
 return lEMF;
}< /pre> 
Now I need to configure (inject) EntityManager em to perform JPA operations like em.persist(), em.find etc... How do I configure it, and some people try to explain this with sample code
 p>
With Spring Boot, there is no need to use something like persistence.xml Such a configuration file. You can use annotations for configuration. Just configure the JPA database configuration in 
 
application.properties
 
 
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
 Then you can use the CrudRepository provided by Spring, you have a standard CRUD transaction method. There, you can also implement your own SQL, such as JPQL.

@Transactional
public interface ObjectRepository extends CrudRepository {
...
}
If you still need to use the entity manager, you can create another class.

public class ObjectRepositoryImpl implements ObjectCustomMethods{

 @PersistenceContext
 private EntityManager em;

}
This should be in your pom.xml


 org.springframework.boot
  spring-boot-starter-parent
 1.2.5.RELEASE
 

 

 
 org.springframework.boot
 spring-boot-starter-data-jpa
 


 
 org.springframework 
 spring-orm
 
 
 org.hibernate
 hibernate-core
 4.3.11.Final