14.SpringData-Mongo

SpringData-Mongo

Spring-data对MongoDB做了支持，使用spring-data-mongodb可以简化MongoDB的操作，封装了底层的mongodb-driver。

地址：https://spring.io/projects/spring-data-mongodb

使用Spring-Data-MongoDB很简单，只需要如下几步即可：

• 导入起步依赖
• 编写配置信息
• 编写实体类（配置注解 @Document，@Id）
• 操作mongodb
  • 注入MongoTemplate对象，完成CRUD操作
  • 编写Repository接口，注入接口完成基本Crud操作

一、环境搭建，导入起步依赖

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.9.RELEASE</version>
    </parent>


    <dependencies>
           <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
            <version>2.3.9.RELEASE</version>
        </dependency>

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

    </dependencies>

二、编写配置信息，application.yml

spring:
  data:
    mongodb:
      uri: mongodb://192.168.136.160:27017/tb_student

三、编写实体类（配置注解 @Document，@Id

package com.zhang.mongodb.domain;

import org.bson.types.ObjectId;
import org.springframework.data.mongodb.core.mapping.Document;

@Document(value = "student")
public class Student {

    private ObjectId id;
    private String name;
    private Integer age;
    private String school;

    public Student() {
    }

    public Student(String name, Integer age, String school) {
        this.name = name;
        this.age = age;
        this.school = school;
    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

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

    public String getSchool() {
        return school;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", school='" + school + '\'' +
                '}';
    }

    public void setSchool(String school) {
        this.school = school;
    }
}

四、编写启动类

package com.zhang.mongodb;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

//服务启动类
@SpringBootApplication
public class MongoDBApplication {
    public static void main(String[] args) {
        SpringApplication.run(MongoDBApplication.class, args);
    }
}

五、新建测试类操作MongoDB,crud

import com.mongodb.MongoGridFSException;
import com.zhang.mongodb.MongoDBApplication;
import com.zhang.mongodb.domain.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.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.test.context.junit4.SpringRunner;

import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = MongoDBApplication.class)
public class TestMongoDb {

    @Autowired
    private MongoTemplate template;

    //增
    @Test
    public  void test(){

        Student student =new Student();
        student.setName("社会龙");
        student.setAge(29);
        student.setSchool("傻逼玩意");

        template.save(student);
    }
    /**
     * 查询所有
     */
    @Test
    public  void findAll(){
        List<Student> allStudent = template.findAll(Student.class);
        for (Student student : allStudent) {
            System.out.println(student);
        }
    }

    /**
     * 条件查询
     */
    @Test
    public  void  findOfContion(){
        //1.创建Criteria对象，设置条件
        Criteria criteria  = Criteria.where("name").is("社会龙");
        //2.根据Criteria创建query对象
        Query query = Query.query(criteria);
        List<Student> students = template.find(query, Student.class);
        for (Student student : students) {
            System.out.println(student);
        }
    }

    /**
     * 分页查询
     */
    @Test
    public  void findPage(){
        int page = 1;
        int pageSize = 2;

        Criteria criteria = Criteria.where("age").lt(50);
        Query query = Query.query(criteria);
        query.skip((page - 1) * pageSize);
        query.limit(pageSize);

        List<Student> students = template.find(query, Student.class);
        for (Student student : students) {
            System.out.println(student);
        }
    }

    /**
     * 修改
     */
    @Test
    public  void  update(){
        //1.根据id修改
        Criteria criteria = Criteria.where("id").is("63554b381e26b657eaa77aa4");

        Query query = Query.query(criteria);

        Update update = new Update();
        update.set("name", "傻逼社会龙");
        update.set("school","装逼社会long");

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

    /**
     * 删除
     */
    @Test
    public  void  remove(){
        Criteria criteria = Criteria.where("id").is("63554b381e26b657eaa77aa4");
        Query query = Query.query(criteria);
        template.remove(query, Student.class);
    }
}