Question

我正在尝试在我的应用程序中使用2个不同的数据源/数据库，但到目前为止我无法连接到它们。

FirstDb配置文件

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "xx.xx.xx.crud.repository.running", entityManagerFactoryRef = "dummyTestEntityManagerFactory", transactionManagerRef = "transactionManagerOne")
@PropertySource("classpath:application.properties")
public class dummyTestDbConfig {

    @Value("${spring.datasourcedummyTestraid.driver-class-name}")
    String driverClassName = "";
    @Value("${spring.datasourcedummyTestraid.url}")
    String url = "";
    @Value("${spring.datasourcedummyTestraid.username}")
    String userName = "";
    @Value("${spring.datasourcedummyTestraid.password}")
    String password = "";
    @Autowired
    @Qualifier("jpadummyTestVendorApapter")
    JpaVendorAdapter jpadummyTestVendorApapter;

    @Bean(name = "dummyTestDataSource")
    @Primary
    public DataSource dummyTestDataSource() {
        return DataSourceBuilder.create().url(url)
                .driverClassName(driverClassName).username(userName)
                .password(password).build();
    }

    @Bean
    @Primary
    public LocalContainerEntityManagerFactoryBean dummyTestEntityManagerFactory() {
        LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();

        factoryBean.setDataSource(dummyTestDataSource());
        factoryBean.setJpaVendorAdapter(jpadummyTestVendorApapter);
        factoryBean.setPackagesToScan(R.dummyTestDB_PACKAGE);
        factoryBean.setPersistenceUnitName("dummyTestPersistenceUnit");
        factoryBean.afterPropertiesSet();

        return factoryBean;
    }

    @Bean
    PlatformTransactionManager transactionManagerOne() {
        return new JpaTransactionManager(dummyTestEntityManagerFactory()
                .getObject());
    }

    @Bean(name = "jpadummyTestVendorApapter")
    @Primary
    public JpaVendorAdapter jpadummyTestVendorAdapter() {
        HibernateJpaVendorAdapter jpadummyTestVendorAdapter = new HibernateJpaVendorAdapter();
        jpadummyTestVendorAdapter.setShowSql(true);
        jpadummyTestVendorAdapter.setGenerateDdl(true);
        jpadummyTestVendorAdapter.setDatabase(Database.MYSQL);
        return jpadummyTestVendorAdapter;
    }

    @Bean
    public HibernateExceptionTranslator hibernateExceptionTranslator() {
        return new HibernateExceptionTranslator();
    }

}

第二次数据库配置

 @Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "xx.xx.xx.xx.xx.running", entityManagerFactoryRef = "alpharaidEntityManagerFactory", transactionManagerRef = "transactionManagertwo")
@PropertySource("classpath:application.properties")
public class alphaDbConfig {

    @Value("${spring.datasourcealpharaid.driver-class-name}")
    String driverClassName = "";
    @Value("${spring.datasourcealpharaid.url}")
    String url = "";
    @Value("${spring.datasourcealpharaid.username}")
    String userName = "";
    @Value("${spring.datasourcealpharaid.password}")
    String password = "";
    @Autowired
    @Qualifier("jpaMyalphaVendorAdapter")
    JpaVendorAdapter myalphaVendorAdapter;

    @Bean(name = "alpharaidDataSource")
    public DataSource alpharaidDataSource() {
        return DataSourceBuilder.create().url(url)
                .driverClassName(driverClassName).username(userName)
                .password(password).build();
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean alpharaidEntityManagerFactory() {
        LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();

        factoryBean.setDataSource(alpharaidDataSource());

        factoryBean.setJpaVendorAdapter(myalphaVendorAdapter);
        factoryBean.setPackagesToScan(R.alphaDB_PACKAGE);
        factoryBean.setPersistenceUnitName("alpharaidPersistenceUnit");
        factoryBean.afterPropertiesSet();

        return factoryBean;
    }

    @Bean
    PlatformTransactionManager transactionManagerTwo() {
        return new JpaTransactionManager(alpharaidEntityManagerFactory()
                .getObject());
    }

    @Bean(name = "jpaMyalphaVendorAdapter")
    public JpaVendorAdapter jpaMyalphaVendorAdapter() {
        HibernateJpaVendorAdapter jpaVendorAdapter = new HibernateJpaVendorAdapter();
        jpaVendorAdapter.setShowSql(true);
        jpaVendorAdapter.setGenerateDdl(true);
        jpaVendorAdapter.setDatabase(Database.MYSQL);
        return jpaVendorAdapter;
    }

}

当我启动服务器时，我收到异常

    2015-08-19 15:21:25.412 ERROR 16928 --- [           main] org.hibernate.tool.hbm2ddl.SchemaUpdate  : HHH000299: Could not complete schema update

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Access denied for user 'xyz'@'192.168.XX.XX' to database 'xyz'
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
    at com.mysql.jdbc.Util.getInstance(Util.java:360)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:978)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:870)
    at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1659)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1206)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2234)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2265)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2064)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:790)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)

和另一个相同的例外（虽然稍晚）

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [javax.persistence.EntityManagerFactory] is defined: expected single matching bean but found 2: alpharaidEntityManagerFactory,dummyTestEntityManagerFactory
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findDefaultEntityManagerFactory(PersistenceAnnotationBeanPostProcessor.java:572)
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findEntityManagerFactory(PersistenceAnnotationBeanPostProcessor.java:531)
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor$PersistenceElement.resolveEntityManager(PersistenceAnnotationBeanPostProcessor.java:697)
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor$PersistenceElement.getResourceToInject(PersistenceAnnotationBeanPostProcessor.java:670)
    at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:169)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.postProcessPropertyValues(PersistenceAnnotationBeanPostProcessor.java:354)
    ... 29 more

我的属性文件以读取连接详细信息

spring.datasourcedummyTestraid.driver-class-name=com.mysql.jdbc.Driver
spring.datasourcedummyTestraid.url=jdbc:mysql://xx.xx.xx.xx/xyz
spring.datasourcedummyTestraid.username=xxx
spring.datasourcedummyTestraid.password=xxx

spring.datasourcealpharaid.driver-class-name=com.mysql.jdbc.Driver
spring.datasourcealpharaid.url=jdbc:mysql://xx.xx.xx.xx/abc
spring.datasourcealpharaid.username=xxx
spring.datasourcealpharaid.password=xxx


Few Observations:

在异常中可以看到它正在尝试连接到我的本地数据库，192.168.XX.XX是我的本地地址。

 com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Access denied for user 'xyz'@'192.168.XX.XX' to database 'xyz'

（不存在），我正在尝试连接到属性文件中定义的2个不同的远程数据库。为什么它会转到本地？

当我评论其中一个配置然后其他运行正常（虽然没有访问问题）的问题 No qualifying bean of type [javax.persistence.EntityManagerFactory]为此，我试图制作一个Bean主要版本，尝试使其功能简单但没用。

请帮我解决问题。感谢。

Answer 1

你可以避免这样做

@Value("${spring.datasourcealpharaid.driver-class-name}")
String driverClassName = "";
@Value("${spring.datasourcealpharaid.url}")
String url = "";
@Value("${spring.datasourcealpharaid.username}")
String userName = "";
@Value("${spring.datasourcealpharaid.password}")
String password = "";
@Autowired
@Qualifier("jpaMyAlphaVendorAdapter")
JpaVendorAdapter myAlphaVendorAdapter;

@Bean(name = "dummyTestDataSource")
public DataSource dummyTestDataSource() {
    return DataSourceBuilder.create().url(url)
            .driverClassName(driverClassName).username(userName)
            .password(password).build();
}

而是使用以下行减少代码：

@ConfigurationProperties(prefix = "spring.datasourcealpharaid")
@Bean
@Primary
public DataSource postgresDataSource() {
    return DataSourceBuilder.create().
            build();
}

为了避免下面的例外情况，您可以将bean命名为entityManagerFactory

引起：org.springframework.beans.factory.NoUniqueBeanDefinitionException：没有定义[javax.persistence.EntityManagerFactory]类型的限定bean：期望的单个匹配bean但找到2：macraidEntityManagerFactory，nextGenEntityManagerFactory

@Bean(name = "entityManagerFactory") @Primary public LocalContainerEntityManagerFactoryBean emf1(EntityManagerFactoryBuilder builder){ return builder .dataSource(postgresDataSource()) .packages("io.eddumelendez.springdatajpa.domain1") .persistenceUnit("users") .build(); }

检查完整配置here

在Spring JPA中连接到两个不同的数据库失败

1 个答案: