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 }
,
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 }
,
