mongodb使用

1.Windows上下载安装

下载地址

默认安装后将bin目录加载到环境变量中
C:Program FilesMongoDBServer3.4bin

MongoDB中服务端和客户端都在同一个目录中，mongod.exe为服务程序，mongo为客户段程序

创建MongoDB数据目录 d:mongodbdata

启动mongodb服务程序：

mongod --dbpath d:\mongodata

客户端访问

mongo 127.0.0.1 //如果不指定ip，则会访问本地

####2.简介

mongodb是c++语言编写的非关系型数据库，但是在非关系型数据库中最像关系型数据库的。其是面向存储存储的数据库，主要概念有文档、集合和数据库等，是基于分布式文件存储的数据库，具有性能高、可扩展、易部署、易使用，存储数据方便等特点,其文件存储格式是bson格式，bson格式是json格式的扩展.

3.基本操作命令

use demo; //选择一个db,如果没有就创建然后进入
db;//显示当前db名称
show dbs; //查看所有db
db.demo.insert({"_id":"520","name":"xiaoxiao"});
//向demo库中插入一个文档，_id表示文档的唯一标识
db.demo.find(); //查询demo集合所有数据
db.demo.find();
db.demo.update({"_id":"520"},{$set:{"name":"xiaosun"}});

4.java操作mongodb

引入依赖

<dependencies>  
    <dependency>  
        <groupId>org.mongodb</groupId>  
        <artifactId>mongodb-driver</artifactId>  
        <version>3.6.3</version>  
    </dependency>  
</dependencies>

demo

package com.xiayu;

import com.mongodb.BasicDBObject;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

import java.util.HashMap;
import java.util.Map;

public class MongoTest {
    public static void main(String[] args) {
        MongoClient mongoClient = new MongoClient("127.0.0.1");
        MongoDatabase demoDB = mongoClient.getDatabase("demo");
        MongoCollection<Document> collection = demoDB.getCollection("demo");
//        BasicDBObject basicDBObject = new BasicDBObject("name","xiaoxiao");
        BasicDBObject basicDBObject = new BasicDBObject("_id","520");
        FindIterable<Document> documents = collection.find(basicDBObject);
        for (Document document:documents){
            System.out.println(document.get("name"));
            System.out.println(document.get("_id"));
        }
        //use demo;
        //db.demoCollection.find("name":"xiaoxiao");
        Map map = new HashMap<String, String>();
        map.put("_id","100");
        map.put("name","zhangsan");
        map.put("age","100");
        map.put("birthday","2020-01-01");
        Document document = new Document(map);
        collection.insertOne(document);
        mongoClient.close();
    }
}

5.使用spring-data-mongodb使用demo

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xiayu</groupId>
    <artifactId>mongodbdemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE    </version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

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

application.yml

server:  
 port: 9996  
spring:  
 application: name: mongodbdemo  
  data:  
 mongodb: host: 127.0.0.1  
      database: demo

repository

package com.xiayu.dao;

import com.xiayu.entity.Remark;
import org.springframework.data.mongodb.repository.MongoRepository;

public interface RemarkDao extends MongoRepository<Remark,String> {

}

service

package com.xiayu.service.impl;

import com.xiayu.dao.RemarkDao;
import com.xiayu.entity.Remark;
import com.xiayu.service.IRemarkService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;


@Service("remarkServiceImpl")
@Transactional
public class RemarkServiceImpl implements IRemarkService {

    @Autowired
    private RemarkDao remarkDao;

    public List<Remark> findAll(){
        return remarkDao.findAll();
    }

    public Remark findRemarkById(String remarkId){
        return remarkDao.findById(remarkId).get();
    }

    public boolean insertRemark(Remark remark){
        remarkDao.insert(remark);
        return true;
    }

}