Spring Boot 和 Mybatis 项目中多个数据源时的 NoUniqueBeanDefinitionException

Question

在Spring Boot 和Mybatis 项目中配置多个数据源时，出现以下异常：

org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.transaction.PlatformTransactionManager' available: expected single matching bean but found 2: primaryTx,secondTx at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1041) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:345) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:340) ~[spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE] at org.springframework.transaction.interceptor.TransactionAspectSupport.determineTransactionManager(TransactionAspectSupport.java:384) ~[spring-tx-4.3.13.RELEASE.jar:4.3.13.RELEASE] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:272) ~[spring-tx-4.3.13.RELEASE.jar:4.3.13.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.13.RELEASE.jar:4.3.13.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE] at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE] at com.sun.proxy.$Proxy86.findByDomain(Unknown Source) ~[na:na]

项目开始

@SpringBootApplication( exclude = {
        DataSourceAutoConfiguration.class, 
        DataSourceTransactionManagerAutoConfiguration.class
})
@EnableTransactionManagement
public class BookSystemApplication {
}

数据源配置

@Configuration
public class DataSourceConfig {
    @Bean(name = "primaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSource primaryDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "secondDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.second")
    public DataSource secondDataSource() {
        return DataSourceBuilder.create().build();
    }
}

交易

@Configuration
public class TransactionConfig {
    @Autowired
    @Qualifier("primaryDataSource")
    private DataSource primary;

    @Autowired
    @Qualifier("secondDataSource")
    private DataSource second;

    @Bean(name="primaryTx")
    public PlatformTransactionManager primaryTransaction() {
        return new DataSourceTransactionManager(primary);
    }

    @Bean(name="secondTx")
    public PlatformTransactionManager secondTransaction() {
        return new DataSourceTransactionManager(second);
    }
}

Answer 1

这里的问题是您将两个 beans 定义为 datasource 并将两个 bean 定义为 TransactionManager 但您没有指定其中一个是 primary 一，这行不通，因为 Spring 需要一个 datasource bean 和一个 TransactionManager bean 被定义为主要 如果定义了多个.

您在这里应该做的是将您的数据源之一 beans 和您的 TransactionManager beans 之一定义为 Primary，以便 Spring 可以运行正确，为此你需要使用 @Primary 注释 .

@Bean(name = "primaryDataSource")
@Primary
@ConfigurationProperties(prefix = "spring.datasource.primary")
public DataSource primaryDataSource() {
    return DataSourceBuilder.create().build();
}

请参阅文档中的 the Spring's Configure two datasources section。

Answer 2

首先感谢√的解答，完美解决了我的问题

而且我可以向某人提供 thinking.Unnecessary @Primary 的另一种方式，您可以在您的服务中定义 @Transactional("primaryTx")。

像这样：

    @Override
    @Transactional("primaryTx")
    public Test update() {
        Test entity = new Test();
        entity.setId(1L);
        entity.setPhone("19900000050");
        return testRepository.save(entity);
    }

Spring Boot 和 Mybatis 项目中多个数据源时的 NoUniqueBeanDefinitionException

NoUniqueBeanDefinitionException when multiple datasources in Spring Boot and Mybatis project

java

mybatis

spring-boot