使用2个相同类型的豆子：javax.sql.DataSource in Spring

java spring

2022-09-03 09:49:54

我正在开发一个基于Spring Boot的应用程序，我想在其中创建2个bean：一个指向“Oracle”数据库;另一个将指向Hive。我声明如下：

public @Bean
BoneCPDataSource metadataDataSource() {
    BoneCPDataSource boneCPDataSource = new BoneCPDataSource();
    boneCPDataSource.setDriverClass(getDriver());
    boneCPDataSource.setJdbcUrl(getJdbcUrl());
    boneCPDataSource.setUser(getUser());
    boneCPDataSource.setPassword(getPassword());
    boneCPDataSource.setMaxConnectionsPerPartition(5);
    boneCPDataSource.setPartitionCount(5);
    return boneCPDataSource;
}

public @Bean
BasicDataSource hiveDataSource() {
    BasicDataSource basicDataSource = new BasicDataSource();

    // Note: In a separate command window, use port forwarding like this:
    //
    // ssh -L 127.0.0.1:9996:<server>:<port> -l <userid> <server>
    //
    // and then login as the generic user.

    basicDataSource.setDriverClassName("org.apache.hadoop.hive.jdbc.HiveDriver");
    basicDataSource.setUrl("jdbc:hive://127.0.0.1:9996:10000/mytable");
    return basicDataSource;
}

问题是在创业时，我得到了这个：

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

主要是因为它们都继承自javax.sql.DataSource。解决此问题的最佳方法是什么？

编辑：

现在我声明如下：

public @Bean (name="metadataDataSource")
BoneCPDataSource metadataDataSource() {
    BoneCPDataSource boneCPDataSource = new BoneCPDataSource();
    boneCPDataSource.setDriverClass(getDriver());
    boneCPDataSource.setJdbcUrl(getJdbcUrl());
    boneCPDataSource.setUser(getUser());
    boneCPDataSource.setPassword(getPassword());
    boneCPDataSource.setMaxConnectionsPerPartition(5);
    boneCPDataSource.setPartitionCount(5);
    return boneCPDataSource;
}

public @Bean (name="hiveDataSource")
BasicDataSource hiveDataSource() {
    BasicDataSource basicDataSource = new BasicDataSource();

    // Note: In a separate command window, use port forwarding like this:
    //
    // ssh -L 127.0.0.1:9996:<server>:<port> -l <userid> <server>
    //
    // and then login as the generic user.

    basicDataSource.setDriverClassName("org.apache.hadoop.hive.jdbc.HiveDriver");
    basicDataSource.setUrl("jdbc:hive://127.0.0.1:9996:10000/mytable");
    return basicDataSource;
}

并得到这个例外：

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

其他类引用这些豆子，如下所示：

公共类 MetadataProcessorImpl 实现 MetadataProcessor {

@Autowired
@Qualifier("metadataDataSource")
BoneCPDataSource metadataDataSource;

@Controller 公共类 HiveController {

@Autowired
@Qualifier("hiveDataSource")
BasicDataSource hiveDataSource;

答案 1

将其中一个梁设置为@Primary如 67.2 配置两个数据源中所述

http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#howto-two-datasources

答案 2

使用@Bean时，为 Bean 指定不同的名称：

@Bean(name="bonecpDS")
public BoneCPDataSource metadataDataSource() {
    //...
}

@Bean(name="hiveDS")
public BasicDataSource hiveDataSource() {
    //...
}

然后，在注入 bean 时，使用 @Qualifier 并指定 Bean 的名称：

@Component
public class FooComponent {
    @Autowired
    @Qualifier("bonecpDS")
    DataSource boneCPDataSource;
}