Node.js 如何从mongo数据库集合中获取具有特定键和值的critarea结果?
假设我们有一个名为postsNode.js 如何从mongo数据库集合中获取具有特定键和值的critarea结果?,node.js,mongodb,express,mongoose,Node.js,Mongodb,Express,Mongoose,假设我们有一个名为posts { "_id": ObjectId("5146bb52d8524270060001f3"), "post_text":"This is a sample post" , "user_name": "mark", "post_privacy": "public",
{
"_id": ObjectId("5146bb52d8524270060001f3"),
"post_text":"This is a sample post" ,
"user_name": "mark",
"post_privacy": "public",
"post_likes_count": 0
},
{
"_id": ObjectId("5146bb52d8524270060001f4"),
"post_text": "This is a sample post",
"user_name": "pramod",
"post_privacy": "public",
"post_likes_count": 0
}
假设mysql中有相同的表。
我想在mongo中查询同样的sql结果
查询为:从user\u name=“mark”所在的帖子中选择帖子数量代码>
我们如何在mongodb中获得相同的结果?Ans:
db.posts.find({user_name:"mark"});
可能存在的副本