[root@localhost ~]# mongo MongoDB shell version: 1.8.1 connecting to: test gt; db test gt; show collections

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[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" : "c728e00401a72282a29198723dbff7" }
> 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" } }
>