Query operations under MongoDB (corresponding to Java API query operations)

Related reading:

Install and start MongoDB in Linux

Advanced query example in MongoDB

MongoDB Java API for insert and single collection basic query examples

Query operations under MongoDB (corresponding to Java API query operations)

[Root @ localhost ~] # Mongo
MongoDB shell version: 1.8.1
Connecting to: test
> Db
Test
> Show collections
Data_test
System. indexes
System. users
> Db. system. users. find ()
{"_ Id": ObjectId ("4dd73c7d247cb75e4995757b"), "user": "iwtxokhtd", "readOnly": false, "pwd": "success "}
> Db. data_test.find ()
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a30"), "userId": "10010171", "userName": "Bill Tu1", "gender": "m1 ", "interests": {"game": "game1", "ball": "ball1", "other": "nothing1 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a31"), "userId": "10010172", "userName": "Bill Tu2", "gender": "m2 ", "interests": {"game": "game2", "ball": "ball2", "other": "nothing2 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a32"), "userId": "10010173", "userName": "Bill Tu3", "gender": "m3 ", "interests": {"game": "game3", "ball": "ball3", "other": "nothing3 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a33"), "userId": "10010174", "userName": "Bill Tu4", "gender": "m4 ", "interests": {"game": "game4", "ball": "ball4", "other": "nothing4 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a34"), "userId": "10010175", "userName": "Bill Tu5", "gender": "m5 ", "interests": {"game": "game5", "ball": "ball5", "other": "nothing5 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a35"), "userId": "10010176", "userName": "Bill Tu6", "gender": "m6 ", "interests": {"game": "game6", "ball": "ball6", "other": "nothing6 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a36"), "userId": "10010177", "userName": "Bill Tu7", "gender": "m7 ", "interests": {"game": "game7", "ball": "ball7", "other": "nothing7 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a37"), "userId": "10010178", "userName": "Bill Tu8", "gender": "m8 ", "interests": {"game": "game8", "ball": "ball8", "other": "nothing8 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a38"), "userId": "10010179", "userName": "Bill Tu9", "gender": "m9 ", "interests": {"game": "game9", "ball": "ball9", "other": "nothing9 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a39"), "userId": "100101710", "userName": "Bill Tu10", "gender": "m10 ", "interests": {"game": "game10", "ball": "ball10", "other": "nothing10 "}}
> Db. data_test.findOne ()
{
"_ Id": ObjectId ("4dd747cb3a491e68a1a84a30 "),
"UserId": "10010171 ",
"UserName": "Bill Tu1 ",
"Gender": "m1 ",
"Interests ":{
"Game": "game1 ",
"Ball": "ball1 ",
"Other": "nothing1"
}
}
> Db. data_test.find ({"userId": "10010171 "})
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a30"), "userId": "10010171", "userName": "Bill Tu1", "gender": "m1 ", "interests": {"game": "game1", "ball": "ball1", "other": "nothing1 "}}
> Db. data_test.find ({"userId": "10010171", "userName": "Bill Tu1 "})
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a30"), "userId": "10010171", "userName": "Bill Tu1", "gender": "m1 ", "interests": {"game": "game1", "ball": "ball1", "other": "nothing1 "}}
> Db. data_test.find ({"userId": {$ in: ["10010171", "10010172"]})
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a30"), "userId": "10010171", "userName": "Bill Tu1", "gender": "m1 ", "interests": {"game": "game1", "ball": "ball1", "other": "nothing1 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a31"), "userId": "10010172", "userName": "Bill Tu2", "gender": "m2 ", "interests": {"game": "game2", "ball": "ball2", "other": "nothing2 "}}
> Db. data_test.find ({"userId":/10010171. */I })
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a30"), "userId": "10010171", "userName": "Bill Tu1", "gender": "m1 ", "interests": {"game": "game1", "ball": "ball1", "other": "nothing1 "}}
{"_ Id": ObjectId ("4dd747cb3a491e68a1a84a39"), "userId": "100101710", "userName": "Bill Tu10", "gender": "m10 ", "interests": {"game": "game10", "ball": "ball10", "other": "nothing10 "}}
>