使用相同类型的2个bean：Spring中的javax.sql.DataSource [英] Using 2 beans of the same type: javax.sql.DataSource in Spring

问题描述

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：一个将指向'Oracle'数据库;另一个将指向Hive。我已将它们声明如下：

I am developing a Spring Boot based application in which I would like to create 2 beans: One will point to 'Oracle' database; the other will point to Hive. I've declared them as follows:

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;
}

问题是在启动时我得到了这个：

Problem is at the startup I am getting this:

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

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

Mainly because both of them inherit from javax.sql.DataSource. What's the best way to fix this?

编辑：

现在我已将它们声明如下：

Now I've declared them as follows:

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;
}

并获得此例外：

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

其他类指的是这些bean，如下所示：

The other classes are referring to these beans as follows:

公共类MetadataProcessorImpl实现MetadataProcessor {

public class MetadataProcessorImpl implements MetadataProcessor {

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

@Controller
公共类HiveController {

@Controller public class HiveController {

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

推荐答案

使用 @Bean ：

@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：

Then, when injecting the bean, use @Qualifier and specify the name of the bean:

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

这篇关于使用相同类型的2个bean：Spring中的javax.sql.DataSource的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！