mongodb保存数据时，字段名带点号时保存会以子文档的形式保存

本文主要是介绍mongodb保存数据时，字段名带点号时保存会以子文档的形式保存，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

例子

我要保存这样的数据：

{ "date" : { "$date" : "2016-10-09T16:00:00.000Z"} , 
"createtime" : { "$date" : "2016-12-27T09:36:13.305Z"} , 
"status" : 1 , "registry_sum" : 114 , 
"Go-Goal新一代V3.0" : 2 , 
"Go-Goal新一代V3.0_mobile" :  null  , 
"Go-Goal新一代V3.0_email" : 2 , 
"Go-Goal新一代V3.0_weixin" :  null  , 
"Go-Goal新一代V3.0_mobile_success" :  null  , 
"Go-Goal新一代V3.0_mobile_fail" :  null  , 
"Go-Goal新一代V3.0_email_success" :  null  , 
"Go-Goal新一代V3.0_email_fail" : 2 , 
"Go-Goal新一代V3.0_weixin_success" :  null  , 
"Go-Goal新一代V3.0_weixin_fail" :  null  , 
"Go-Goal新一代V3.0_mobile_success_person" :  null  , 
"Go-Goal新一代V3.0_mobile_fail_person" :  null  , 
"Go-Goal新一代V3.0_mobile_success_business" :  null  , 
"Go-Goal新一代V3.0_mobile_fail_business" :  null  , 
"Go-Goal新一代V3.0_email_success_person" :  null  , 
"Go-Goal新一代V3.0_email_fail_person" : 2 , 
"Go-Goal新一代V3.0_email_success_business" :  null  , 
"Go-Goal新一代V3.0_email_fail_business" :  null  , 
"Go-Goal新一代V3.0_weixin_success_person" :  null  , 
"Go-Goal新一代V3.0_weixin_fail_person" :  null  , 
"Go-Goal新一代V3.0_weixin_success_business" :  null  , 
"Go-Goal新一代V3.0_weixin_fail_business" :  null 
}

我们可以看到保存的字段例如：Go-Goal新一代V3.0是带有点号的。

但是保存到mongodb中就变成了子文档的显示：

    "Go-Goal新一代V3" : {"0" : 2,"0_email" : 2,"0_email_fail" : 2,"0_email_fail_business" : null,"0_email_fail_person" : 2,"0_email_success" : null,"0_email_success_business" : null,"0_email_success_person" : null,"0_mobile" : null,"0_mobile_fail" : null,"0_mobile_fail_business" : null,"0_mobile_fail_person" : null,"0_mobile_success" : null,"0_mobile_success_business" : null,"0_mobile_success_person" : null,"0_weixin" : null,"0_weixin_fail" : null,"0_weixin_fail_business" : null,"0_weixin_fail_person" : null,"0_weixin_success" : null,"0_weixin_success_business" : null,"0_weixin_success_person" : null},

这里写图片描述

我们可以看到，它变成了，字段为Go-Goal新一代V3，value变成了子文档的形式。

那么我们该怎么访问呢？

访问子文档

db.gg_registry.find({"Go-Goal新一代V3.0":5, "Go-Goal新一代V3.0_email":2})

也就是说，访问子文档，就是字段加.号就可以了，这与我想保存字段为Go-Goal新一代V3.0是不冲突的。

结果为:

    "Go-Goal新一代V3" : {"0" : 5,"0_email" : 2,"0_email_fail" : 2,"0_email_fail_business" : 1,"0_email_fail_person" : 1,"0_email_success" : null,"0_email_success_business" : null,"0_email_success_person" : null,"0_mobile" : 1,"0_mobile_fail" : 1,"0_mobile_fail_business" : null,"0_mobile_fail_person" : 1,"0_mobile_success" : null,"0_mobile_success_business" : null,"0_mobile_success_person" : null,"0_weixin" : 2,"0_weixin_fail" : 2,"0_weixin_fail_business" : null,"0_weixin_fail_person" : 2,"0_weixin_success" : null,"0_weixin_success_business" : null,"0_weixin_success_person" : null},