有没有办法在配置了两个 mongo 数据库的 springboot 应用程序中使用 MongoOpeations

Question

我已经使用 springboot 完成了一个示例应用程序，使用以下参考https://dzone.com/articles/multiple-mongodb-connectors-with-spring-boot连接两个数据库

我可以使用扩展 MongoRepository 的存储库接口访问来自不同数据库的数据但我想使用 MongoOperations 访问数据，如下所示如何区分两个数据库

@RestController
@RequestMapping(value = "/sample")
public class SampleController {

    private final PrimaryRepository primaryRepository;
    private final SecondaryRepositor secondaryRepository;


    @Autowired
    MongoOperations mongoOps;

    @Autowired
    public SampleController(PrimaryRepository primaryRepository, SecondaryRepositor secondaryRepository) {
        this.primaryRepository = primaryRepository;
        this.secondaryRepository = secondaryRepository;
    }

    @RequestMapping(method = RequestMethod.GET)
    public void sample() {
        log.info("************************************************************");
        log.info("Start printing mongo objects");
        log.info("************************************************************");
       primaryRepository.save(new PrimaryModel(null, "Primary database plain object"));

        secondaryRepository.save(new SecondaryModel(null, "Secondary database plain object"));

        List<PrimaryModel> primaries = primaryRepository.findAll();
        for (PrimaryModel primary : primaries) {
            log.info(primary.toString());
        }

        List<SecondaryModel> secondaries = secondaryRepository.findAll();
        **List<SecondaryModel> second =   mongoOps.findAll(SecondaryModel.class);**
        log.info("RES: {}",second);
        for (SecondaryModel secondary : secondaries) {
            log.info(secondary.toString());
        }

        log.info("************************************************************");
        log.info("Ended printing mongo objects");
        log.info("************************************************************");

    }
}```

Answer 1

您需要使用@Qualifier来获取所需的 MongoDB 实例。

@Autowired
@Qualifier("primaryMongoTemplate")
MongoOperations primaryMongoOps;

@Autowired
@Qualifier("secondaryMongoTemplate")
MongoOperations secondaryMongoOps;

笔记：

您不需要public SampleController(PrimaryRepository primaryRepository, SecondaryRepositor secondaryRepository) ，而是使用：

@RestController
@RequestMapping(value = "/sample")
public class SampleController {

    @Autowired
    PrimaryRepository primaryRepository;

    @Autowired
    SecondaryRepositor secondaryRepository;

    @Autowired
    @Qualifier("primaryMongoTemplate")
    MongoOperations primaryMongoOps;

    @Autowired
    @Qualifier("secondaryMongoTemplate")
    MongoOperations secondaryMongoOps;

    @RequestMapping(method = RequestMethod.GET)
    public void sample() {
    ...

Answer 2

您可以创建两个 MongoOperations bean。 您可以将替换localhost替换为 DB 机器 IP 地址。 如果你有分片集群，你可以改变下面的实现new MongoClient(new MongoClientURI("mongodb://host1:27017,host2:27017"));

@Configuration
class MongoConfiguration {

    @Bean
    public MongoClient mongo() {
        return new MongoClient("localhost", 27017); // server address, port
    }

    @Bean
    @Qualifier("firstDatabase")
    public MongoTemplate mongoTemplate() throws Exception {
        return new MongoTemplate(mongo(), "test1Db"); // test1Db is database name 
    }

    @Bean
    @Qualifier("secondDatabase")
    public MongoTemplate mongoTemplate() throws Exception {
        return new MongoTemplate(mongo(), "test2Db");
    }
}

现在在您的控制器中，您可以注入MongoTemplate并连接到相应的数据库。

@Autowired
@Qualifier("firstDatabase")
MongoOperations mongoOps1;

@Autowired
@Qualifier("secondDatabase")
MongoOperations mongoOps2;

Answer 3

您可以尝试以下配置以使用多个数据库与 MongoOperation @Configuration @EnableMongoRepositories(basePackages={"com.company.repo.dbOne"}, mongoTemplateRef="mongoTemplateOne") public class AbcRepoConfiguration {

@Bean(name="mongoPropertiesOne")
@ConfigurationProperties
public MongoProperties mongoProperties() {
    return new MongoProperties();
}

@Bean(name="mongoPropertiesOne")
public SimpleMongoDbFactory mongoDbFactory(MongoClient mongo, @Qualifier("mongoPropertiesOne") MongoProperties mongoProperties) throws Exception {
    String database = this.mongoProperties.getMongoClientDatabase();
    return new SimpleMongoDbFactory(mongo, database);
}

@Bean(name="mongoTemplateOne")
public MongoTemplate mongoTemplate(@Qualifier("mongoTemplateOne") MongoDbFactory mongoDbFactory, MongoConverter converter) throws UnknownHostException {
    return new MongoTemplate(mongoDbFactory, converter);
}

} @Configuration @EnableMongoRepositories(basePackages={"com.company.repo.dbTwo"}, mongoTemplateRef="mongoTemplateTwo") 公共类 AbcRepoConfiguration {

@Bean(name="mongoPropertiesTwo")
@ConfigurationProperties
public MongoProperties mongoProperties() {
    return new MongoProperties();
}

@Bean(name="mongoPropertiesTwo")
public SimpleMongoDbFactory mongoDbFactory(MongoClient mongo, @Qualifier("mongoPropertiesTwo") MongoProperties mongoProperties) throws Exception {
    String database = this.mongoProperties.getMongoClientDatabase();
    return new SimpleMongoDbFactory(mongo, database);
}

@Bean(name="mongoTemplateTwo")
public MongoTemplate mongoTemplate(@Qualifier("mongoTemplateTwo") MongoDbFactory mongoDbFactory, MongoConverter converter) throws UnknownHostException {
    return new MongoTemplate(mongoDbFactory, converter);
}

}