Question

我正在尝试使用反应式mongo库和spring数据构建应用程序。但是，每次我打应用程序并使用dao.findAll()时，都会得到一个空数组。请在下面找到代码。

/config/MongoAdminConfig.java


@EnableReactiveMongoRepositories
public class MongoAdminConfig extends AbstractReactiveMongoConfiguration {

    @Override
    @Bean
    public MongoClient reactiveMongoClient() {
        MongoClientSettings settings = MongoClientSettings.builder()
                .applyConnectionString(new ConnectionString("mongodb://localhost:27017/projects"))
                .build();
        return MongoClients.create(settings);
    }

    @Override
    protected String getDatabaseName() {
        return "projects";
    }
}

/controllers/AccountController.java

@RestController
@RequestMapping("accounts")
public class AccountController {

    @Autowired
    private AccountDao accountDao;

    @GetMapping
    public Flux<Account> getAllAccounts() {
        return this.accountDao.findAll();
    }
}

/dao/AccountDao.java

public interface AccountDao extends ReactiveCrudRepository<Account, String> {
}

/models/Account.java

@Document(collection = "accounts")
public class Account {
    @Id
    private String id;

    private String accountNumber;
    private String type;
    private String status;
    private double availableBalance;
    private String currency;

    //getters and setters 
}

数据库查询示例

> db.accounts.find({})
{ "_id" : ObjectId("5deb40c43e079db50337b211"), "accountNumber" : "BANK123456", "type" : "savings", "status" : "active", "availableBalance" : 10000.5, "currency" : "USD" }
> db
projects
>

/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.aditapillai.demos</groupId>
    <artifactId>accounts-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <version>2.2.1.RELEASE</version>
        <artifactId>spring-boot-starter-parent</artifactId>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>
    </dependencies>

</project>

可以在GitHub

上找到该代码

平台详细信息：

操作系统：Ubuntu 19.04 LTS
Mongo版本：4.2.1

我的mongo服务器在本地计算机上的端口27017上运行
这是一个新的mongo安装。

Answer 1

通过执行以下操作固定。

已删除/config/MongoAdminConfig.java /Application.java

@SpringBootApplication
@EnableReactiveMongoRepositories
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

src/main/resources/application.yml

spring:
  data:
    mongodb:
      host: localhost
      port: 27017
      database: projects

我将继续了解这里到底发生了什么。

Spring Data总是返回带有反应式Mongo存储库的空数组

1 个答案: