> show collections;
_test
_test_serial_number
_test_message_send
inventory
>
> db._test_message_send.find()
2017-09-29T01:52:37.612+0000 E QUERY [thread1] TypeError: db._wechat_message_send is undefined :
@(shell):1:1
> db._test_message_send.count()
2017-09-29T01:53:25.302+0000 E QUERY [thread1] TypeError: db._wechat_message_send is undefined :
@(shell):1:1
带下划线的集合名字查询的时候应使用getCollection，例如:
> db.getCollection('_test_message_send').count()
2562
> db.getCollection('_test_message_send').findOne()
{
"_id" : "93e4cc65502344f584bfb385f94dde35",
"_class" : "com.base.entities.WechatMessageSend",
"type" : 4,
"status" : 3,
"memberId" : "863eee3694fc45",
"openId" : "oB3wuwViNwa2G2NpOCdjMSvFJCcY",
"templateId" : "2KKEiTYulLq4RxRudlNuX",
"messageId" : "7a33b0f20e2e43c",
"createTime" : ISODate("2016-07-19T00:23:37.346Z")
}
重命名集合名字:
> db.getCollection('_test').renameCollection("_test_bak20171011");
{ "ok" : 1 }
文章标题：MongoDB小技巧之如何使用带下划线的集合名查询
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