前言

第一篇入门文章简单介绍了一下，mongodb图形化管理工具、常用shell命令和spring boot中jpa对mongodb的操作，本次介绍一下mybatis对mongodb的操作

1、依赖

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

2、启动类

启动类上添加对EnableMongoRepositories注解

@EnableMongoRepositories("com.clockbone.mongodb")
public class ApplicationBoot {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(ApplicationBoot.class, args);
    }
}

3、entity类

entity类中直接用注解来定义mongodb集合名，entity中的属性就对应mongodb的属性，mongodb中字段增减变化，会随entity中的属性增减变化，mongodb不用手动建立集合，新增的时候自动建立这个集合。即使查询操在前也没不会报错，只是返回的结果集为空。

import lombok.*;
import org.springframework.data.mongodb.core.mapping.Document;
import java.util.Date;
@Setter
@Getter
@ToString
@Builder
@Document(collection = "user_info")
@AllArgsConstructor
@NoArgsConstructor
public class UserInfo {
    private String userName;
    private String userId;
    private String sex;
    private String age;
    private String job;
    private String address;
    private String idcard;
    private String idcardType;
    private String mobileNo;
    private String homeTel;
    private String post;
    private String asset;
    private Date createTime;

}

4、mongodb Repositories方法

和mybatis操作mysql数据不同的是，mongodb定义不是Interface，而是class类，类里面引用MongoTemplate对像对mongodb操作

import com.clockbone.entity.UserInfo;
import org.springframework.data.domain.Sort;
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.Service;
import javax.annotation.Resource;
import java.util.Date;
import java.util.List;
@Service
public class UserRepository {
    @Resource
    private MongoTemplate mongoTemplate;

    public void save(UserInfo userInfo){
        userInfo.setCreateTime(new Date());
        mongoTemplate.save(userInfo);
    }

    public List<UserInfo> selectByParameter(UserInfo userInfo){
        Criteria criteria = Criteria
                .where("userId").is(userInfo.getUserId())
                .and("userName").is(userInfo.getUserName())
                ;
        Query query = new Query(criteria).with(new Sort(Sort.Direction.DESC, "createTime"));
        return mongoTemplate.find(query, UserInfo.class);
    }
}