Question

我用spring-boot和neo4j创建了应用程序。以下是neo4j的弹簧启动应用

@Configuration
@ComponentScan({ "myproject" })
@EnableAutoConfiguration
@EnableNeo4jRepositories(basePackages = "myproject")
public class Neo4jServer extends Neo4jConfiguration implements CommandLineRunner
{

  public Server()
  {
      setBasePackage("myproject");
  }

  @Bean
  SpringRestGraphDatabase graphDatabaseService()
  {
      return new SpringRestGraphDatabase("http://localhost:7474/db/data");
  }

  public void run(String... args) throws Exception
  {
  }

  public static void main(String[] args) throws Exception
  {
      SpringApplication.run(Neo4jServer.class, args);
  }

}

以下是使用mysql的 spring boot 应用程序

@Configuration
@ComponentScan({ "myproject" })
@EnableAutoConfiguration
@EnableJpaRepositories(basePackages = "myproject.persistence")
@PropertySource("myproject.properties")
public class MySQLServer extends DataSourceAutoConfiguration implements CommandLineRunner
{
  public void run(String... args) throws Exception
  {
  }

  public static void main(String[] args) throws Exception
  {
    SpringApplication.run(MySQLServer.class, args);
  }

}

我在资源包中创建了属性文件。

spring.datasource.url=jdbc:mysql://localhost:3306/myDB
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName=com.mysql.jdbc.Driver

所以，现在有两个应用程序，一个是neo4j，即Neo4jServer.java，另一个是MySQL，即MySQLServer.java 如何在单个应用程序中使用它们。如果错误，请让我纠正。谢谢:)）

Answer 1

需要将MySQL配置的DataSource / TransactionManager bean注入应用程序类。 MySQL Entities / DAO和Neo4j Node / Relationship / DAO需要位于不同的包中。然后，您可以将这些相应的软件包提供给MySQL和Neo4j。

以下代码显示配置：

@Configuration
@ComponentScan({ "myproject" })
@EnableJpaRepositories(basePackages = "myproject.persistence.mysql")
@EnableAutoConfiguration
@EnableNeo4jRepositories(basePackages = "myproject.persistence.neo4j")
public class Application extends Neo4jConfiguration
{
    @Autowired
    LocalContainerEntityManagerFactoryBean entityManagerFactory;

    public Application()
    {
        setBasePackage("myproject.persistence.neo4j");
    }

    @Bean
    SpringRestGraphDatabase graphDatabaseService()
    {
        return new SpringRestGraphDatabase("http://localhost:7474/db/data");
    }

    @Bean(destroyMethod = "close")
    public DataSource dataSource()
    {
        DataSource dataSource = new DataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/dbname");
        dataSource.setUsername("mysqluser");
        dataSource.setPassword("mysqlpassword");
        return dataSource;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() 
    {
        LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactory.setDataSource(dataSource());
        entityManagerFactory.setPackagesToScan("myproject.persistence.mysql");
        entityManagerFactory.setJpaDialect(new HibernateJpaDialect());
        Map<String, String> jpaProperties = new HashMap<String, String>();
        jpaProperties.put("hibernate.connection.charSet", "UTF-8");
        jpaProperties.put("hibernate.ejb.naming_strategy", "org.hibernate.cfg.EJB3NamingStrategy");
        jpaProperties.put("hibernate.bytecode.provider", "javassist");
        jpaProperties.put("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");
        entityManagerFactory.setJpaPropertyMap(jpaProperties);
        entityManagerFactory.setPersistenceProvider(new HibernatePersistence());
        return entityManagerFactory;
    }

    @Override
    @Bean(name = "transactionManager")
    public PlatformTransactionManager neo4jTransactionManager() throws Exception 
    {
        return new ChainedTransactionManager(new JpaTransactionManager(entityManagerFactory.getObject()),
            new JtaTransactionManagerFactoryBean(graphDatabaseService()).getObject());
    }

    @Bean
    public PersistenceExceptionTranslationPostProcessor exceptionTranslation() 
    {
        return new PersistenceExceptionTranslationPostProcessor();
    }
}

如何在单个spring-boot应用程序中使用MySQL和neo4j

1 个答案: