springboot连接mongodb进行CRUD

springboot连接mongodb进行CRUD的过程：

在执行以下操作前已安装了mongodb并创建了用户和数据库，使用Robo 3T可成功连接。

1.创建springboot项目，加入以下maven依赖

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

2.在application.properties中加入mongo连接配置

spring.data.mongodb.host=127.0.0.1
spring.data.mongodb.port=27017
spring.data.mongodb.username=admin
spring.data.mongodb.password=password
spring.data.mongodb.database=DBTest
spring.data.mongodb.authentication-database=admin

3.创建实体类

package com.example.mongodb.entity;

import org.springframework.data.mongodb.core.mapping.Document;

// @Document的collection属性设置的是在mongo库中的集合名称
@Document(collection = "passenger")
public class Passenger {

    private String name;
    private String password;

    public String getName() {
        return name;
    }

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

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

4.创建controller

package com.example.mongodb.controller;

import com.example.mongodb.entity.Driver;
import com.example.mongodb.entity.Passenger;
import com.mongodb.client.result.DeleteResult;
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.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class TestContoller {

    @Autowired
    MongoTemplate mongoTemplate;

    @RequestMapping("/insert")
    public String insert() {
        Passenger passenger = new Passenger();
        passenger.setName("hello");
        passenger.setPassword("world1");
        passenger = mongoTemplate.insert(passenger);
        if (passenger != null) {
            return "success";
        } else {
            return "false";
        }
    }

    @RequestMapping("/query")
    public String query() {
        Query query = Query.query(Criteria.where("name").is("hello").and("password").is("world1"));
        List<Passenger> passengers = mongoTemplate.find(query, Passenger.class);
        return passengers.size() + "";
    }


    @RequestMapping("/update")
    public String update() {
        Query query = Query.query(Criteria.where("password").is("world1"));
        Update update = new Update();
        update.set("name", "world2");
        update.set("password", "world2");
        UpdateResult updateResult = mongoTemplate.updateFirst(query, update, Passenger.class);
        return "success";
    }

    @RequestMapping("/remove")
    public String remove() {
        Query query = Query.query(Criteria.where("password").is("world1"));
        DeleteResult remove = mongoTemplate.remove(query, Passenger.class);
        return "success";
    }
}

发送CRUD请求后在mongo库中生成了对应的集合