Spring boot中使用Mongodb

安装

使用Idea新建Spring boot工程时需要选择Mongodb

或者在工程中加入依赖

Maven：

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

Gradle：

dependencies {
  compile('org.springframework.boot:spring-boot-starter-data-mongodb')
}

目录结构

配置

在application.yml中配置

spring:
  data:
      mongodb:
        uri: mongodb://test:test@127.0.0.1:27017/test

或者在application.properties配置

spring.data.mongodb.uri=mongodb://test:test@127.0.0.1:27017/test

其中URL的格式是：mongodb://用户名:用户名@ip地址:端口/数据库

使用

在实体类中加入注解

package com.example.demo.domain;

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.index.IndexDirection;
import org.springframework.data.mongodb.core.index.Indexed;
import org.springframework.data.mongodb.core.mapping.Document;

import java.io.Serializable;

/**
 * 用户模型
 *
 * @author hackyo
 * Created on 2017/12/3 11:53.
 */
@Document
public class User implements Serializable {

    @Id
    private String id;

    @Indexed(unique = true, direction = IndexDirection.DESCENDING, dropDups = true)
    private String username;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

}

@Document表示该类为实体类

@Id表示该字段为自动生成的ID

@Indexed表示自动为该字段建立索引

编写查询接口

package com.example.demo.dao;

import com.example.demo.domain.User;

/**
 * 用户表操作接口
 *
 * @author hackyo
 * Created on 2017/12/3 11:53.
 */
public interface IUserRepository {

    /**
     * 通过用户名查找用户
     *
     * @param username 用户名
     * @return 用户信息
     */
    User findByUsername(String username);

}

查询接口实现

package com.example.demo.dao.impl;

import com.example.demo.dao.IUserRepository;
import com.example.demo.domain.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Repository;

/**
 * 用户表操作接口实现
 *
 * @author hackyo
 * Created on 2017/12/3 11:53.
 */
@Repository
public class UserRepositoryImpl implements IUserRepository {

    private MongoTemplate mongoTemplate;

    @Autowired
    public UserRepositoryImpl(MongoTemplate mongoTemplate) {
        this.mongoTemplate = mongoTemplate;
    }

    @Override
    public User findByUsername(String username) {
        Query query = new Query(Criteria.where("username").is(username));
        return mongoTemplate.findOne(query, User.class);
    }

}

测试

测试类

package com.example.demo;

import com.example.demo.dao.IUserRepository;
import com.example.demo.domain.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {

    @Autowired
    private IUserRepository userRepository;

    @Test
    public void contextLoads() {
    }

    @Test
    public void test() {
        User user = userRepository.findByUsername("test");
        System.out.println(user.getId());
    }

}

查询出结果即完成