SpringBoot增和MongoDB实现增删改查、复合查询

SpringBoot增和MongoDB实现增删改查、复合查询

依赖

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

实体类
Student类

@Data  //自动生成get set方法
@Document(collection = "student") //指定相对应的表名
public class Student implements Serializable {

    @Id
    private Integer _id;

    private String name;

    private String sex;

    private Integer age;

    private Integer gradeId;

    private Grade grade;

    public Student(Integer _id, String name, String sex, Integer age, Integer gradeId) {
        this._id = _id;
        this.name = name;
        this.sex = sex;
        this.age = age;
        this.gradeId = gradeId;
    }

    public Student() {
    }
}

Grade类

@Data
public class Grade {

    private Integer _id;

    private String name;
}

ServiceImpl

@Component //把普通pojo实例化到spring容器中，相当于配置文件中的<bean id="" class=""/>
public class StudentServiceImpl implements StudentService {

    //这样就可以直接使用了
    @Autowired
    private MongoTemplate mongoTemplate;

    /**
     * 复合查询
     * @return
     */
    @Override
    public List<Map> fuhechaxun() {
        LookupOperation lookupOperation = LookupOperation.newLookup().
                from("grade").//关联表名
                localField("gradeId").//关联字段
                foreignField("_id").//主表关联字段对应的次表字段
                as("grade");
        Aggregation aggregation = Aggregation.newAggregation(lookupOperation);
        List<Map> results = mongoTemplate.aggregate(aggregation, "student", Map.class).getMappedResults();
        return results;
    }

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

    /**
     * 添加学生信息
     * @param student
     */
    @Override
    public void save(Student student) {
        mongoTemplate.save(student);
    }

    /**
     * 修改学生信息
     * @param student
     */
    @Override
    public void update(Student student) {
        //修改条件
        Query query =new Query(Criteria.where("_id").is(student.get_id()));

        Update update = new Update();
        update.set("name",student.getName());
        update.set("age",student.getAge());
        update.set("sex",student.getSex());
        update.set("gradeId",student.getGradeId());

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

    /**
     * 删除学生信息
     * @param id
     */
    @Override
    public void delete(Integer id) {
        Student studnet = mongoTemplate.findById(id,Student.class);
        mongoTemplate.remove(studnet);
    }
}

接下来我们去测试类测试一下

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

    @Autowired
    private StudentService studentService;

    @Test
    public void findAll() {
        List<Student> students = studentService.findAll();
        System.out.println(students);
        System.out.println("编号\t姓名\t年龄\t性别\t年级");
        for (Student student:students) {
            System.out.println(student.get_id()+"\t\t"+student.getName()+"\t"+student.getAge()+"\t\t"+student.getSex()+"\t\t"+student.getGradeId());
        }
    }

    @Test
    public void delete() {
        studentService.delete(5);

        System.out.println("执行删除");

        findAll();
    }

    @Test
    public void save() {
        Student student = new Student(5,"小刘","男",20,3);
        studentService.save(student);

        System.out.println("执行新增");

        findAll();
    }

    @Test
    public void update() {
        Student student = new Student(1,"小黑","男",25,3);
        studentService.update(student);

        System.out.println("执行修改");
        
        findAll();
    }

    @Test
    public void fuhechaxun(){
        List<Map> maps = studentService.fuhechaxun();
        for (Map map:maps) {
            System.out.println(map);
        }
    }
}

首先是查询所有 单表的

接着新增一个小刘

然后干掉小刘

将id为1的修改为楼下小黑

复合查询