如何在同一项目中连接两个数据库MySQL和MongoDB？可能吗？

  • Z时代
  • 2024-01-10
  • 分类：问答

当前，我在Spring上使用Hibernate（MySQL），该配置对我来说运行良好，但是一旦我配置了另一个配置mongo-

config.xml文件并尝试使用mongodb运行测试用例，就会 从第一种配置开始。

<context:annotation-config />
<context:component-scan base-package="com.test.mongo" />
<context:property-placeholder location="classpath:mongo-dao.properties" />
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
</bean>
<bean id="mongoDbFactory" class="org.springframework.data.mongodb.core.MongoFactoryBean">
    <property name="driverClassName" value="${spring.datasource.driverClassName}" />
    <property name="host" value="${spring.data.mongodb.host}" />
    <property name="port" value="${spring.data.mongodb.port}" />
    <property name="databaseName" value="${spring.data.mongodb.database}" />

<context:component-scan base-package="com.hb.dao" />
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="${db.jdbc.driverClassName}" />
    <property name="url" value="${db.jdbc.url}" />
    <property name="username" value="${db.jdbc.username}" />
    <property name="password" value="${db.jdbc.password}" />
</bean>
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan">
        <list>
            <value>com.hb..dao.domain.entity</value>
        </list>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql:false}</prop>
            <prop key="hibernate.format_sql">${hibernate.format_sql:false}</prop>
        </props>
    </property>
</bean>
<bean id="transactionManager"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:99)
at org.springframework.test.context.DefaultTestContext.getApplicationContext(DefaultTestContext.java:101)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:109)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:75)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:331)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:213)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:290)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

依赖注释：

    public class MongoQuestionsTest extends BaseDaoMongoTest{   
        private static final Logger logger = LogManager.getLogger(MongoQuestionsTest.class);
        @Autowired
        private MongoTestDao mongoTestDaoImpl;
        @Test
        public void saveQuestions(){
            MongoQuestions mongoQuestions = new MongoQuestions();
            mongoQuestions.setUsername("Hi");
            mongoQuestions.setPassword("Hello");
            mongoTestDaoImpl.save(mongoQuestions);
            logger.debug("Mongo User Set with id " + mongoQuestions.getId());
        }
    and **BaseDaoMongoTest**---
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations={"classpath:/mongo-config-test.xml"})
    public class BaseDaoMongoTest {
    }

在MongoTestDaoImpl类中，我只是自动连接MongoTemplate并调用了save（）方法。

回答：

我不确定这是否是最佳解决方案。但是，它对我有用。如果您有两个使用Jpa模块的关系数据库，那么我建议您创建entity和transaction管理Bean来读取每个数据源配置。

当你希望有一个组合SQL和NoSQL，我会创造entity和transcation对经理豆类MySQL数据库，因为它与运作良好Jpa。并保持原样配置Mongo（直接从读取配置application.properties）。

@Configuration
@PropertySource("classpath:persistence-multiple-db.properties")
@EnableJpaRepositories(basePackages = "com.springdata.dao.mysql", entityManagerFactoryRef = "mysqlEntityManager", transactionManagerRef = "mysqlTransactionManager")
public class MySQLConfiguration {
    @Autowired
    private Environment env;
    @Bean
    @Primary
    public LocalContainerEntityManagerFactoryBean mysqlEntityManager() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(myMySQLDataSource());
        em.setPackagesToScan(new String[] { "com.springdata.models" });
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);
        HashMap<String, Object> properties = new HashMap<String, Object>();
        properties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
        em.setJpaPropertyMap(properties);
        return em;
    }
    @Bean
    @Primary
    public DataSource myMySQLDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(env.getProperty("spring.mysql.jdbc.driverClassName"));
        dataSource.setUrl(env.getProperty("spring.mysql.jdbc.url"));
        dataSource.setUsername(env.getProperty("spring.mysql.user"));
        dataSource.setPassword(env.getProperty("spring.mysql.pass"));
        return dataSource;
    }
    @Bean
    @Primary
    public PlatformTransactionManager mysqlTransactionManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(mysqlEntityManager().getObject());
        return transactionManager;
    }

上面的数据源配置参数是从classpath:persistence-multiple-db.properties类路径中的文件中读取的。

# mysql jdbc connections
spring.mysql.jdbc.driverClassName=com.mysql.jdbc.Driver
spring.mysql.jdbc.url=jdbc:mysql://localhost:3306/test?autoReconnect=true&useSSL=false
spring.mysql.user=root
spring.mysql.pass=password1
# hibernate.X
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

以上配置足以处理MySQL数据源。要在项目中进行mongo配置，请将以下行添加到中application.properties。

# mongo configuration
spring.data.mongodb.uri=mongodb://localhost
spring.data.mongodb.database=test

Springboot将自动创建必要的mongo数据源bean，并使它们随时可供Spring容器使用。

现在，为MySQL和Mongo数据源创建存储库接口。

@Transactional
public interface MyMongoRepository extends MongoRepository<Users, String>{
}

@Transactional
public interface MySQLRepository extends JpaRepository<Users, String>{
}

@Entity
@Table(name = "users")
@Document(collection="users")
@Data
public class Users {
    @Id
    @javax.persistence.Id
    private String id;
    private String name;
    private Integer age;
}

添加了以下注释以启用mongorepositoreis并将组件扫描到springboot主类。

@SpringBootApplication
@ComponentScan(basePackages = { "com.springdata" })
@EnableMongoRepositories(basePackages={"com.springdata.dao.mongo"})
public class SpringbootmysqlmongoApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootmysqlmongoApplication.class, args);
    }
}

最后，要测试一些代码。

@Service
public class MyRepositoryImpl {
    @Autowired
    private MyMongoRepository myMongoRepository;
    @Autowired
    private MySQLRepository mySQLRepository;
    @PostConstruct
    public void extractUsers(){
        myMongoRepository.findAll().forEach((user) -> System.out.println("user name from mongo is : "+user.getName()));
        mySQLRepository.findAll().forEach((user) -> System.out.println("User name from mysql is : "+user.getName()));
    }
}

users在mysql test数据库中创建了表并在数据库中进行了users收集mongo test。

最后，已将我的代码上传到git存储库。

https://github.com/harshavmb/springbootmysqlmongo

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