spring boot(十一)：Spring boot中mongodb的使用

mongodb简介

　　传统的关系数据库一般由数据库（database）、表（table）、记录（record）三个层次概念组成，

　　MongoDB是由数据库（database）、集合（collection）、文档对象（document）三个层次组成。

mongodb使用

1、pom包配置

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

2、在application.properties中添加配置

spring.data.mongodb.host=127.0.0.1
spring.data.mongodb.port=27017
spring.data.mongodb.username=root
spring.data.mongodb.password=123456
spring.data.mongodb.database=admin

或者

spring.data.mongodb.uri=mongodb://name:pass@localhost:27017/test

多个IP集群可以采用以下配置：

spring.data.mongodb.uri=mongodb://user:pwd@ip1:port1,ip2:port2/database

3、创建数据实体

package cn.cnki.ref.pojo;

import java.io.Serializable;

public class User implements Serializable {

    private int id;
    private String name;
    private String username;
    private int age;
    private String phone;
    private String email;
    //无参构造函数必须有，ORM框架调用的就是无参构造函数
    public User() {

    }
    public User(int id, String name, String username, int age, String phone, String email) {
        super();
        this.id = id;
        this.name = name;
        this.username = username;
        this.age = age;
        this.phone = phone;
        this.email = email;
    }
    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 getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", username=" + username + ", age=" + age + ", phone=" + phone
                + ", email=" + email + "]";
    }
}

4.UserMongodbServiceImpl

package cn.cnki.ref.serviceimpl;

import cn.cnki.ref.pojo.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.data.mongodb.core.query.Update;
import org.springframework.stereotype.Service;

@Service
public class UserMongodbServiceImpl {
    @Autowired
    private MongoTemplate mongoTemplate;

    /**
     * 创建对象
     *
     * @param user
     */
    public void saveUser(User user) {
        mongoTemplate.save(user);
    }

    /**
     * 根据用户名查询对象
     *
     * @param userName
     * @return
     */
    public User findUserByUserName(String userName) {
        Query query = new Query(Criteria.where("name").is(userName));
        User user = mongoTemplate.findOne(query, User.class);
        return user;
    }

    /**
     * 更新对象
     *
     * @param user
     */
    public void updateUser(User user) {
        Query query = new Query(Criteria.where("id").is(user.getId()));
        Update update = new Update().set("name", user.getName()).set("username", user.getUsername());
        //更新查询返回结果集的第一条
        mongoTemplate.updateFirst(query, update, User.class);
        //更新查询返回结果集的所有
        // mongoTemplate.updateMulti(query,update,UserEntity.class);
    }

    /**
     * 删除对象
     *
     * @param id
     */
    public void deleteUserById(Long id) {
        Query query = new Query(Criteria.where("id").is(id));
        mongoTemplate.remove(query, User.class);
    }

}

5.测试

package cn.cnki.ref.serviceimpl;

import cn.cnki.ref.pojo.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;

import static org.junit.Assert.*;

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMongodbServiceImplTest {
    @Autowired
    private  UserMongodbServiceImpl userMongodbServiceImpl;

    @Test
    public void saveUser() {
        User user = new User(1, "mf", "沐风", 20, "15010298065", "[e-mail]");
        userMongodbServiceImpl.saveUser(user);
    }

    @Test
    public void findUserByUserName() {
        User user = userMongodbServiceImpl.findUserByUserName("mf");
        System.out.println(user);
    }

    @Test
    public void updateUser() {
        User user = new User();
        user.setId(1);
        user.setName("mufeng");
        user.setUsername("沐风");
        userMongodbServiceImpl.updateUser(user);
    }

    @Test
    public void deleteUserById() {
        userMongodbServiceImpl.deleteUserById(1l);
    }
}

MongoTemplate