MongoDB-6：集成MongoBD到SpringBoot

一、准备工作

    1.插入数据

> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB
shop    0.000GB
> use shop
switched to db shop
> db.user.insert({name:'zs',age:25},{name:'ls',age:28})
WriteResult({ "nInserted" : 1 })

二、集成

    1.引入依赖

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

    2.设置配置文件

spring:
  mvc:
    view:
      prefix: WEB-INF/pages/
      suffix: .jsp
  data:
    mongodb:
      host: 127.0.0.1
      port: 27017
      database: shop

    3.创建实体：注意@Document(collection = "user")，collection指的是表名

package com.cfl.mongodb.model;

import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.data.mongodb.core.mapping.Document;

@EntityScan
@Document(collection = "user")
public class User {

	private String name;
	
	private Integer age;

	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;
	}

	@Override
	public String toString() {
		return "User [name=" + name + ", age=" + age + "]";
	}
}

     4.创建Controller测试

package com.cfl.mongodb.controller;

import org.springframework.beans.factory.annotation.Autowired;
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.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.cfl.mongodb.model.User;

@Controller
@RequestMapping("/")
public class UserController {
	
	@Autowired
	private MongoTemplate mongoTemplate;
	
	@RequestMapping("home")
	public Object home() {
	    return "home";  
	}
	
	@RequestMapping("findByName")
	@ResponseBody
	public Object findByName(String name) {
		
		String dbName = mongoTemplate.getDb().getName();   
        System.out.println("数据库名为："+dbName);  
        
        Criteria criteria = new Criteria();
        criteria.and("name").is(name);  
        Query query = new Query();
        query.addCriteria(criteria);
        User user = mongoTemplate.findOne(query, User.class); 
        if(user != null) {
            return "home";  
	}
	
	@RequestMapping("findByName")
	@ResponseBody
	public Object findByName(String name) {
		
		String dbName = mongoTemplate.getDb().getName();   
        System.out.println("数据库名为："+dbName);  
        
        Criteria criteria = new Criteria();
        criteria.and("name").is(name);  
        Query query = new Query();
        query.addCriteria(criteria);
        User user = mongoTemplate.findOne(query, User.class); 
        if(user != null) {
            System.out.println("user："+user.toString()); 
        }
	    return user;
	}
	
	@RequestMapping("findByAll")
	@ResponseBody
	public Object findByAll() {
		return mongoTemplate.findAll(User.class);
	}
}