mongo day 1 (install)
MongoDB 是一種 document-oriented 的 database，沒有 row 的概念，而是用 document．
row data :
id name
1 "Daniel"
2 "Sam"
3 "Allen"
document(json 格式) :
[
{id:1,name:"Daniel"},
{id:2,name:"Sam"},
{id:3,name:"Allen"}
]
建立 mongodb-org-4.0.repo
sudo touch /etc/yum.repos.d/mongodb-org-4.0.repo
加上內容
[mongodb-org-4.0]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.0/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.0.asc
安裝 mongodb packages
sudo yum install -y mongodb-org
啟動 mongod
sudo service mongod start
啟動後可以查看 log 路徑如下 :
/var/log/mongodb/mongod.log
正常啟動的內容 :
2018-10-09T07:19:06.735+0000 I CONTROL [main] ***** SERVER RESTARTED *****
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] MongoDB starting : pid=17859 port=27017 dbpath=/var/lib/mongo 64-bit host=dmpt-2
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] db version v4.0.3
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] git version: 7ea530946fa7880364d88c8d8b6026bbc9ffa48c
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] allocator: tcmalloc
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] modules: none
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] build environment:
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] distmod: rhel70
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] distarch: x86_64
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] target_arch: x86_64
2018-10-09T07:19:07.287+0000 I CONTROL [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1", port: 27017 }, processManagement: { fork: true, pidFilePath: "/var/run/mongodb/mongod.pid", timeZoneInfo: "/usr/share/zoneinfo" }, storage: { dbPath: "/var/lib/mongo", journal: { enabled: true } }, systemLog: { destination: "file", logAppend: true, path: "/var/log/mongodb/mongod.log" } }
設定檔的路徑如下 :
/etc/mongod.conf
檔案內容如下 :
[miuser@dmpt-2 mongodb]$ cat /etc/mongod.conf
# mongod.conf
# for documentation of all options, see:
# http://docs.mongodb.org/manual/reference/configuration-options/
# where to write logging data.
systemLog:
destination: file
logAppend: true
path: /var/log/mongodb/mongod.log
# Where and how to store data.
storage:
dbPath: /var/lib/mongo
journal:
enabled: true
# engine:
# mmapv1:
# wiredTiger:
# how the process runs
processManagement:
fork: true # fork and run in background
pidFilePath: /var/run/mongodb/mongod.pid # location of pidfile
timeZoneInfo: /usr/share/zoneinfo
# network interfaces
net:
port: 27017
bindIp: 127.0.0.1 # Enter 0.0.0.0,:: to bind to all IPv4 and IPv6 addresses or, alternatively, use the net.bindIpAll setting.
#security:
#operationProfiling:
#replication:
#sharding:
## Enterprise-Only Options
#auditLog:
#snmp:
下指令進入
mongo --host 127.0.0.1:27017
show 出目前的 databases :
> show dbs
admin 0.000GB
config 0.000GB
local 0.000GB
> show databases
admin 0.000GB
config 0.000GB
local 0.000GB
查看當前的 db :
> db
test
查看資料筆數 :
> db.collection.count()
0
查看所有 collections
> show collections
mongodb 本身有 javascript shell 可以寫一些 javascript 語法． 新增資料 :
> student1 = { id : 1 , name : "Daniel" , age : 30 }
{ "id" : 1, "name" : "Daniel", "age" : 30 }
> db.student.insert(student1)
WriteResult({ "nInserted" : 1 })
會看到 mongo 建立了 student 的 collection
> show collections
student
查看資料 :
> db.student.find()
{ "_id" : ObjectId("5bbc6455d33691bc6113bdaf"), "id" : 1, "name" : "Daniel", "age" : 30 }
可以查看目前 db 支持哪些方法 :
> db.help()
DB methods:
db.adminCommand(nameOrDocument) - switches to 'admin' db, and runs command [just calls db.runCommand(...)]
db.aggregate([pipeline], {options}) - performs a collectionless aggregation on this database; returns a cursor
db.auth(username, password)
db.cloneDatabase(fromhost) - deprecated
db.commandHelp(name) returns the help for the command
db.copyDatabase(fromdb, todb, fromhost) - deprecated
db.createCollection(name, {size: ..., capped: ..., max: ...})
db.createView(name, viewOn, [{$operator: {...}}, ...], {viewOptions})
db.createUser(userDocument)
...