1 登录命令
$/apps/product/mongodb/bin/mongo 127.0.0.1:27006/test -u test -p test
MongoDB shell version: 3.0.3
connecting to:127.0.0.1:27006/test
Server has startup warnings:
2018-09-25T19:17:59.643+0800 I CONTROL [initandlisten]
mongotest:PRIMARY>
2 help命令
mongotest:PRIMARY> 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
3 查询相关命令
mongo中有数据库，但是数据库里不是表，而是集合，换了个名称。开始不知道，还一脸懵逼，看了help命令才知道。
show dbs show database names（显示所有数据库）
show collections show collections in current database（显示当前数据下的集合（类似于mysql show tables;））
db.foo.find() list objects in collection foo(查询当前数据库下foo集合中的所有记录，类似于 mysql中 select * from foo;)
