SpringBoot操作MongoDB實現增刪改查

本篇博客主講如何使用SpringBoot操作MongoDB。

SpringBoot操作MongoDB實現增刪改查

（1）pom.xml引入依賴

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

（2）創建application.yml

spring:
  data:
    mongodb:
      host: 192.168.72.129
      database: studentdb

（3）創建實體類
創建包com.changan.mongodb，包下建包pojo 用於存放實體類，創建實體類

package com.changan.mongdb.pojo;

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

import java.io.Serializable;

@Document(collection = "student")
public class Student implements Serializable {

    @Id
    private Long id;

    private String name;

    private String sex;

    private String age;

    private String introduce;

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getIntroduce() {
        return introduce;
    }

    public void setIntroduce(String introduce) {
        this.introduce = introduce;
    }

    public String getName() {
        return name;
    }

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

    public Long getId() {
        return id;
    }

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

（4）創建數據訪問接口
com.changan.mongodb包下創建dao包，包下創建接口

package com.changan.mongdb.dao;

import com.changan.mongdb.pojo.Student;

import java.util.List;
import java.util.Map;

public interface StudentDao {


    void save(Student student);

    void update(Student student);

    List<Student> findAll();

    void delete(Integer id);
}

（5）創建業務邏輯類
com.changan.mongodb包下創建impl包，包下創建類

package com.changan.mongdb.dao.impl;

import com.changan.mongdb.dao.StudentDao;
import com.changan.mongdb.pojo.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.aggregation.Aggregation;
import org.springframework.data.mongodb.core.aggregation.LookupOperation;
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;

import java.util.List;

@Component
public class StudentDaoImpl implements StudentDao {

    @Autowired
    private MongoTemplate mongoTemplate;

    /**
     * 新增信息
     * @param student
     */
    @Override
    public void save(Student student) {
        mongoTemplate.save(student);
    }

    /**
     * 修改信息
     * @param student
     */
    @Override
    public void update(Student student) {
        //修改的條件
        Query query = new Query(Criteria.where("id").is(student.getId()));

        //修改的內容
        Update update = new Update();
        update.set("name",student.getName());

        mongoTemplate.updateFirst(query,update,Student.class);
    }

    /**
     * 查詢所有信息
     * @return
     */
    @Override
    public List<Student> findAll() {
        return mongoTemplate.findAll(Student.class);
    }

    /**
     * 根據id查詢所有信息
     * @param id
     */
    @Override
    public void delete(Integer id) {
        Student byId = mongoTemplate.findById(1,Student.class);
        mongoTemplate.remove(byId);
    }

}

（6）創建測試類

package com.changan.mongdb;

import com.changan.mongdb.dao.StudentDao;
import com.changan.mongdb.pojo.Student;
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 java.util.List;
import java.util.Map;

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

    @Autowired
    private StudentDao studentDao;

    /**
     * 查詢所有信息
     */
    @Test
    public void findAll() {
        List<Student> all = studentDao.findAll();
        System.out.println(all.size());
    }

    /**
     * 新增信息
     */
    @Test
    public void save() {
        Student student = new Student();
        student.setId(6l);
        student.setName("宋人頭");
        studentDao.save(student);
    }

    /**
     * 修改信息
     */
    @Test
    public void update() {
        Student student = new Student();
        student.setId(2l);
        student.setName("吳很帥");
        studentDao.update(student);
    }

    /**
     * 刪除信息
     */
    @Test
    public void delete() {
        studentDao.delete(3);
    }
}