spring-boot-mongodb

1. 功能

利用spring链接MongoDB，并进行增删改查

2. 类结构图

3. 实现

代码结构

实体#UserEntity

package com.jihite.entity;

public class UserEntity {
    private int id;
    private String name;
    private String passwd;

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPasswd() {
        return passwd;
    }

    public void setPasswd(String passwd) {
        this.passwd = passwd;
    }
    @Override
    public String toString() {
        return String.format("id:%s, name:%s, passwd:%s", id, name, passwd);
    }
}

接口#UserDao

package com.jihite.dao;

import com.jihite.entity.UserEntity;

public interface UserDao {
    void saveUser(UserEntity userDao);
    UserEntity getUserByName(String name);
    long updateUserEntity(UserEntity userEntity);
    void deleteUserById(int id);
}

实现#UserDaoImpl

package com.jihite.dao.impl;

import com.jihite.dao.UserDao;
import com.jihite.entity.UserEntity;
import com.mongodb.client.result.UpdateResult;
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.data.mongodb.core.query.Update;
import org.springframework.stereotype.Component;

@Component
public class UserDaoImpl implements UserDao{
    @Autowired
    private MongoTemplate mongoTemplate;

    @Override
    public void saveUser(UserEntity userDao) {
        mongoTemplate.save(userDao);
    }

    @Override
    public UserEntity getUserByName(String name) {
        Query query = new Query(Criteria.where("name").is(name));
        return mongoTemplate.findOne(query, UserEntity.class);
    }

    @Override
    public long updateUserEntity(UserEntity userEntity) {
        Query query = new Query(Criteria.where("id").is(userEntity.getId()));
        Update update = new Update().set("name", userEntity.getName()).set("passwd", userEntity.getPasswd());
        UpdateResult writeResult = mongoTemplate.updateFirst(query, update, UserEntity.class);
        return writeResult.getMatchedCount();
    }

    @Override
    public void deleteUserById(int id) {
        Query query = new Query(Criteria.where("id").is(id));
        mongoTemplate.remove(query, UserEntity.class);
    }

}

#测试

package com.jihite.dao;

import com.jihite.entity.UserEntity;
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 UserDaoTest {

    @Autowired
    private UserDao userDao;

    @Test
    public void testSaveUser() {
        UserEntity user = new UserEntity();
        user.setId(1);
        user.setName("jihite");
        user.setPasswd("abc");
        userDao.saveUser(user);

    }

    @Test
    public void testGetUserByName() {
        UserEntity user = userDao.getUserByName("jihite");
        System.out.println(user);
    }

    @Test
    public void testUpdateUserEntity() {
        UserEntity user = new UserEntity();
        user.setId(1);
        user.setName("jihite2");
        user.setPasswd("efg");
        userDao.updateUserEntity(user);

        user = userDao.getUserByName("jihite2");
        System.out.println(user);

    }

    @Test
    public void testDeleteUserById() {
        userDao.deleteUserById(1);
        UserEntity user = new UserEntity();

        System.out.println(userDao.getUserByName("jihite"));
        System.out.println(userDao.getUserByName("jihite2"));

    }
}

4. 注释

4.1 spring boot父级依赖

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
</parent>

这块配置就是Spring Boot父级依赖，有了这个，当前的项目就是Spring Boot项目了。spring-boot-starter-parent是一个特殊的starter,它用来提供相关的Maven默认依赖，使用它之后，常用的包依赖可以省去version标签。

4.2 起步依赖spring-boot-starter-*** 

起步依赖就像品牌机(对比组装机)，自动给你封装好了你想要实现的功能的依赖，减少解决依赖关系耗费精力。

spring boot提供了很多起步依赖降低项目依赖的复杂度。

5. 代码

链接