SpringBoot操作MongoDB实现增删改查
本篇博客主讲如何使用SpringBoot操作MongoDB。

SpringBoot操作MongoDB实现增删改查

（1）pom.xml引入依赖

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

（2）创建application.yml

spring:
data:

mongodb:
  host: 192.168.72.129
  database: studentdb

（3）创建实体类
创建包com.changan.mongodb，包下建包pojo 用于存放实体类，创建实体类

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）创建数据访问接口
com.changan.mongodb包下创建dao包，包下创建接口

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）创建业务逻辑类
com.changan.mongodb包下创建impl包，包下创建类

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) {
    //修改的条件
    Query query = new Query(Criteria.where("id").is(student.getId()));

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

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

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

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

}

（6）创建测试类

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;

/**
 * 查询所有信息
 */
@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("宋人头");
    studentDao.save(student);
}

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

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

}

作者：丢了微笑该如何释怀
来源：CSDN
原文：https://blog.csdn.net/weixin_42236165/article/details/91884029
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