安装
brew update
brew install mongodb // brew install mongodb --with-openssl
准备数据目录
mkdir -p ~/data/mongodb // ensure that the user account running mongod has read and write permissions for the directory.
默认目录为/data/db。
导入数据库
数据库文件：https://raw.githubusercontent.com/mongodb/docs-assets/primer-dataset/primer-dataset.json
mongoimport --db test --collection restaurants --drop --file ~/Downloads/primer-dataset.json
如果MongoDB中已存在同名的Collection，则会先删除已有的Collection后再导入。
运行Server端
mongod --dbpath ~/data/mongodb
运行Shell
mongo
查看帮助
> help
db.help() help on db methods
db.mycoll.help() help on collection methods
sh.help() sharding helpers
rs.help() replica set helpers
help admin administrative help
help connect connecting to a db help
help keys key shortcuts
help misc misc things to know
help mr mapreduce
show dbs show database names
show collections show collections in current database
show users show users in current database
show profile show most recent system.profile entries with time >= 1ms
show logs show the accessible logger names
show log [name] prints out the last segment of log in memory, 'global' is default
use <db_name> set current database
db.foo.find() list objects in collection foo
db.foo.find( { a : 1 } ) list objects in foo where a == 1
it result of the last line evaluated; use to further iterate
DBQuery.shellBatchSize = x set default number of items to display on shell
exit quit the mongo shell
比如：
> show dbs
admin 0.000GB
local 0.000GB
test 0.005GB
