Spring Boot 配置双数据源

在Spring Boot中配置双数据源通常涉及以下步骤：

1. 配置数据源属性。
2. 创建数据源实例。
3. 配置EntityManagerFactory和TransactionManager。
4. 配置@Configuration类来创建两个不同的Spring容器，每个容器使用不同的数据源。

以下是一个简化的示例代码：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        basePackages = "com.example.repository.first",
        entityManagerFactoryRef = "firstEntityManager",
        transactionManagerRef = "firstTransactionManager")
public class FirstDataSourceConfig {
 
    @Bean
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource.first")
    public DataSource firstDataSource() {
        return DataSourceBuilder.create().build();
    }
 
    @Bean
    public LocalContainerEntityManagerFactoryBean firstEntityManager(EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(firstDataSource())
                .packages("com.example.entity.first")
                .persistenceUnit("first")
                .build();
    }
 
    @Bean
    @Primary
    public PlatformTransactionManager firstTransactionManager(
            @Qualifier("firstEntityManager") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }
}
 
@Configuration
@EnableJpaRepositories(
        basePackages = "com.example.repository.second",
        entityManagerFactoryRef = "secondEntityManager",
        transactionManagerRef = "secondTransactionManager")
public class SecondDataSourceConfig {
 
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.second")
    public DataSource secondDataSource() {
        return DataSourceBuilder.create().build();
    }
 
    @Bean
    public LocalContainerEntityManagerFactoryBean secondEntityManager(EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(secondDataSource())
                .packages("com.example.entity.second")
                .persistenceUnit("second")
                .build();
    }
 
    @Bean
    public PlatformTransaction