mongodb操作

1. mac下的安装

2. mongodb和pymongo的使用

2.1 MongoDB 教程

2.2 PyMongo 3.7.2 Documentation

3. Mongodb For Android

Android 连接MongoDB与基本操作
- 1.To access your PC localhost from Android emulator, use 10.0.2.2 instead of 127.0.0.1. localhost or 127.0.0.1 refers to the emulated device itself, not the host the emulator is running on.
- 2.Reference: https://developer.android.com/studio/run/emulator-networking#networkaddresses
- 3.For Genymotion use: 10.0.3.2 instead of 10.0.2.2

1.$where

1 2	condition = new BasicDBObject(); condition.put("$where", ageStr);

2.$in

1 2	condition = new BasicDBObject() condition.put("age", new BasicDBObject("$in", values))

3.模糊匹配

完全匹配
左匹配
右匹配
模糊匹配

4.$gte/$lte/$gt/lt

1	condition.append("age", new BasicDBObject("$gt",20))

4. Mongodb异常

Error: couldn’t connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection refused :
connect@src/mongo/shell/mongo.js:257:13

Same error here, this worked for me: