How to configure MongoDB database in SpringBoot2

1. Introduction to NoSQL

1. NoSQL concept

NoSQL (Not Only SQL) means "not just SQL". A general term for database management systems that are different from traditional relational databases. NoSQL is used for the storage of very large-scale data. These types of data stores do not require a fixed schema and can scale out without redundant operations.

2. Advantages/disadvantages of NoSQL

--优点:
高可扩展性
分布式计算
低成本
架构的灵活性，半结构化数据
没有复杂的关系
--缺点:
没有标准化
有限的查询功能（到目前为止）
数据展现不直观

2. MongoDB database

1. Introduction to MongoDB

MongoDB is a relationship between a relational database and a non-relational database The product among databases is the one with the richest functions and the most similar to a relational database among non-relational databases. The data structure it supports is very loose and is a json-like bjson format, so it can store more complex data types. The biggest feature of MongoDB is that the query language it supports is very powerful. Its syntax is somewhat similar to an object-oriented query language. It can achieve almost most functions similar to single-table queries in relational databases, and it also supports indexing of data.

2. MongoDB features

1) MongoDB is written in C language and is an open source database system based on distributed file storage.
2) Under high load conditions, adding more nodes can ensure server performance.
3) MongoDB aims to provide scalable, high-performance data storage solutions for WEB applications.
4) MongoDB stores data as a document, and the data structure consists of key-value (key=>value) pairs. MongoDB documents are similar to JSON objects. Field values ​​can contain other documents, arrays, and document arrays.

3. Integration with SpringBoot2

1. MongoDB basic environment

# 打开命令行
MongoDB4.0\bin>mongo
# 展示所有数据库
> show databases
# 新建一个admin数据库，命令比较难为情
> db.admin.insert({"name":"管理员数据库"});
# 使用admin数据库
> use admin
# 创建root用户，具有读写权限
> db.createUser({user:"root",pwd:"root",roles:[{role:"readWrite",db:"admin"}]})
  Successfully added user:

2. Core dependencies

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

3. Configuration file

Username: root
Password: root
Database: admin

spring:
  data:
    mongodb:
      uri: mongodb://root:root@localhost:27017/admin

4. Encapsulated application interface

public interface ImgInfoRepository {
    void saveImg(ImgInfo imgInfo) ;
    ImgInfo findByImgTitle(String imgTitle);
    long updateImgInfo(ImgInfo imgInfo) ;
    void deleteById(Integer imgId);
}

5. Core code block

How to use MongoDB as follows.

import com.boot.mongodb.entity.ImgInfo;
import com.boot.mongodb.repository.ImgInfoRepository;
import com.mongodb.client.result.UpdateResult;
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.stereotype.Service;
import javax.annotation.Resource;
@Service
public class ImgInfoRepositoryImpl implements ImgInfoRepository {
    @Resource
    private MongoTemplate mongoTemplate;
    @Override
    public void saveImg(ImgInfo imgInfo) {
        mongoTemplate.save(imgInfo) ;
    }
    @Override
    public ImgInfo findByImgTitle(String imgTitle) {
        Query query=new Query(Criteria.where("imgTitle").is(imgTitle));
        return mongoTemplate.findOne(query,ImgInfo.class);
    }
    @Override
    public long updateImgInfo(ImgInfo imgInfo) {
        Query query = new Query(Criteria.where("imgId").is(imgInfo.getImgId()));
        Update update= new Update().set("imgTitle", imgInfo.getImgTitle()).set("imgUrl", imgInfo.getImgUrl());
        UpdateResult result = mongoTemplate.updateFirst(query,update,ImgInfo.class);
        return result.getMatchedCount();
    }
    @Override
    public void deleteById(Integer imgId) {
        Query query = new Query(Criteria.where("imgId").is(imgId));
        mongoTemplate.remove(query,ImgInfo.class);
    }
}

6. Test code block

import com.boot.mongodb.MongoDBApplication;
import com.boot.mongodb.entity.ImgInfo;
import com.boot.mongodb.repository.ImgInfoRepository;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import javax.annotation.Resource;
import java.util.Date;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = MongoDBApplication.class)
public class MongoTest {
    @Resource
    private ImgInfoRepository imgInfoRepository ;
    @Test
    public void test1 (){
        ImgInfo record = new ImgInfo() ;
        record.setImgId(1);
        record.setUploadUserId("A123");
        record.setImgTitle("博文图片");
        record.setSystemType(1) ;
        record.setImgType(2);
        record.setImgUrl("https://avatars0.githubusercontent.com/u/50793885?s=460&v=4");
        record.setLinkUrl("https://avatars0.githubusercontent.com/u/50793885?s=460&v=4");
        record.setShowState(1);
        record.setCreateDate(new Date());
        record.setUpdateDate(record.getCreateDate());
        record.setRemark("知了");
        record.setbEnable("1");
        imgInfoRepository.saveImg(record);
    }
    @Test
    public void test2 (){
        ImgInfo imgInfo = imgInfoRepository.findByImgTitle("博文图片") ;
        System.out.println("imgInfo === >> " + imgInfo);
    }
    @Test
    public void test3 (){
        ImgInfo record = new ImgInfo() ;
        record.setImgId(1);
        record.setUploadUserId("A123");
        record.setImgTitle("知了图片");
        record.setSystemType(1) ;
        record.setImgType(2);
        record.setImgUrl("https://avatars0.githubusercontent.com/u/50793885?s=460&v=4");
        record.setLinkUrl("https://avatars0.githubusercontent.com/u/50793885?s=460&v=4");
        record.setShowState(1);
        record.setCreateDate(new Date());
        record.setUpdateDate(record.getCreateDate());
        record.setRemark("知了");
        record.setbEnable("1");
        long result = imgInfoRepository.updateImgInfo(record) ;
        System.out.println("result == >> " + result);
    }
    @Test
    public void test4 (){
        imgInfoRepository.deleteById(1);
    }
}

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