mongodb删除数据

> db.test_ttlsa_com.remove({"ban_friends_id":"BAN121113"})

> db.test_ttlsa_com.count()
2
> db.test_ttlsa_com.remove({})
> db.test_ttlsa_com.count()
0

> show collections
system.indexes
test_ttlsa_com
> db.test_ttlsa_com.drop()
true
> show collections
system.indexes

> show dbs
local   0.078125GB
ttlsa_com       0.203125GB
> db
ttlsa_com
> db.ttlsa_com.getDB()
ttlsa_com
> show collections
system.indexes
> db.dropDatabase()
{ "dropped" : "ttlsa_com", "ok" : 1 }
> db
ttlsa_com
> show dbs
local   0.078125GB