Spring 启动 - 多个数据源的问题

Question

我有一个 ReST 服务需要从两个不同的数据库（Oracle 和 MySQL）获取数据并将这些数据合并到响应中。

我有以下配置。

数据库 1 的配置：

@Configuration 
public class DbConfig_DB1{

    @Bean(name="siebelDataSource")
    public EmbeddedDatabase siebelDataSource(){
        return new EmbeddedDatabaseBuilder().
                setType(EmbeddedDatabaseType.H2).
                addScript("schema.sql").
                addScript("test-data.sql").
                build();

    }

    @Autowired
    @Qualifier("siebelDataSource")
    @Bean(name = "siebelJdbcTemplate") 
    public JdbcTemplate siebelJdbcTemplate(DataSource siebelDataSource) { 
        return new JdbcTemplate(siebelDataSource); 
    } 
}

DB2 的配置：

@Configuration 
public class DbConfig_DB2{      
    @Bean(name="brmDataSource")
    public EmbeddedDatabase brmDataSource(){
        return new EmbeddedDatabaseBuilder().
                setType(EmbeddedDatabaseType.H2).
                addScript("schema-1.sql").
                addScript("test-data-1.sql").
                build();

    }

    @Autowired
    @Qualifier("brmDataSource")
    @Bean(name = "brmJdbcTemplate") 
    public JdbcTemplate brmJdbcTemplate(DataSource brmDataSource) { 
        return new JdbcTemplate(brmDataSource); 
    } 
}

数据访问：

@Repository
public class SiebelDataAccess {
    protected final Logger log = LoggerFactory.getLogger(getClass());

    @Autowired
    @Qualifier("siebelJdbcTemplate")
    protected JdbcTemplate jdbc;

    public String getEmpName(Integer id) {

        System.out.println(jdbc.queryForObject("select count(*) from employee", Integer.class));

        Object[] parameters = new Object[] { id };
        String name = jdbc.queryForObject(
                "select name from employee where id = ?", parameters,
                String.class);
        return name;
    }

}

我无法启动应用程序，因为出现以下错误：

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private javax.sql.DataSource org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration.dataSource; 

nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] is defined: expected single matching bean but found 2: brmDataSource,siebelDataSource

问题出在上下文中的两个 DataSource bean 上。如何解决？

Answer 1

您可以将其中之一标记为 @Primary，这样 Spring 事务管理器的启动自动配置就会知道选择哪一个。如果您需要管理与它们两者的交易，那么恐怕您必须明确设置交易管理。

请参考Spring引导documentation

Creating more than one data source works the same as creating the first one. You might want to mark one of them as @Primary if you are using the default auto-configuration for JDBC or JPA (then that one will be picked up by any @Autowired injections).

Spring 启动 - 多个数据源的问题

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