如何在同一项目中连接两个数据库MySQL和MongoDB？可能吗？
问题内容：
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 显示创建名称为..的bean时出错。 .. 从第一种配置开始。
下面是我的mongo-config.xml
<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}" />
而我的第一个hibernate配置看起来像
<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>
堆栈跟踪是
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)
由以下原因引起：org.springframework.beans.factory.BeanCreationException：创建名称为’accessProfileDaoImpl’的bean时出错：自动连接依赖项的注入失败；
嵌套的异常是org.springframework.beans.factory.BeanCreationException：无法自动连线字段：私有org.hibernate.SessionFactory
com.soe.dao.AbstractDao.sessionFactory;
嵌套的异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：没有找到类型为[org.hibernate.SessionFactory]的合格Bean作为依赖项：至少应有1个可作为该依赖项的自动装配候选者的bean。
依赖注释：
这是我的测试课-
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。
问题答案：
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）。
MySQLConfiguration 数据源配置类：
@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。
MyMongoRepository 接口：
@Transactional
public interface MyMongoRepository extends MongoRepository<Users, String>{
}
MySQLRepository 接口：
@Transactional
public interface MySQLRepository extends JpaRepository<Users, String>{
}
Users pojo课程：
@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。
MyRepositoryImpl 类：
@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
