"MongoDB:" A slightly more complex operation

1: Inserting data in slightly complex form

Doc= ({"user_id": "Abcdbwn",  "password": "Abcdbwn",  "Date_of_join":  "15/10/2010",  "education": "B. C.A. ",  " profession ":" DEVELOPER ",  " interest ":" Music ",  " Community_Name ": [" Modern MUSIC ",                                    " Classicalmusic ",                    " WESTERN MUSIC "],  " community_moder_id ": [" Mr BBB ",                                           " Mr Jjj ","          mrmmm "],  " Community_members ": [+                                           ],"  friends_id ": [" MMM123 ",                       " NNN123 ",       " OOO123 "],  "ban_friends_id": ["BAN123",                              "BAN456",                              "BAN789"]});

> Db.person.insert (DOC) Writeresult ({"ninserted": 1})

2: Use the For loop to insert the document in bulk, as the previous blog has said.

3: Conditional Query

' > ' corresponds to ' $gt ',

' < ' corresponds to ' $lt ',

' >= ' corresponds to ' $gte '

' <= ' corresponds to ' $lte ',

'! = ' corresponds to ' $ne ',

' = ' corresponds to ' no keyword '

Example: Querying the uid>98 data

> Db.person.find ({"UID": {$gt: 98}}) {"_id": ObjectId ("55471dfc994c2a0fdbfa128b"), "UID": +, "addr": "Shanghai" } {"_id": ObjectId ("55471dfc994c2a0fdbfa128c"), "UID": "addr": "Shanghai"}>

For example, the query UID does not equal 99 of the amount of data

> Db.person.find ({"UID": {$ne: ()}). Count () 100

And $in, $nin, etc.

Example: Querying uid=100 and addr= documents for "Shanghai"

> Db.person.find ({"UID": +, "addr": "Shanghai"}) {"_id": ObjectId ("55471dfc994c2a0fdbfa128b"), "UID": +, "addr": "Shanghai"}>

Querying uid=100 or addr= "Shanghia" documents

Db.person.find ({$or: [{},{}]})

> Db.person.find ({$or: [{"UID": 100},{"addr": "Shanghai"}]}). Count ()

　　

Query addr documents that begin with S:

> Db.person.find ({"addr":/^s/})

　　

Query the document ending with addr one I:

> Db.person.find ({"addr":/i$/})

　　

Querying with a Where condition

> Db.person.find ({$where: function () {return this.uid==88}}) {"_id": ObjectId ("55471dfc994c2a0fdbfa1297"), "UID": "Addr": "Shanghai"}>

　　

"MongoDB:" A slightly more complex operation