Mongodb is a non-relational (nosql) database that is widely used at the moment and is free software.
To install the server and the client on Debian, run:
apt-get install mongodb mongodb-clients mongodb-serverConfiguring mongodb.
The configuration of the mongodb server is in /etc/mongodb.conf:
# donde se almacena los datos
dbpath=/var/lib/mongodb
#El log se guarda en el archivo:
logpath=/var/log/mongodb/mongodb.log
#Se define agregar info al log.
logappend=true
#Se define la ip y el puerto donde escuchará mongodb
bind_ip = 127.0.0.1
port = 27017
# Se habilita el journaling, http://www.mongodb.org/display/DOCS/Journaling
journal=true
# Se habilita o deshabilita la autenticación, por defecto está deshabilitado
#noauth = true
#auth = trueStart the service (since I am using systemd, the systemctl command is used): Start the service:
systemctl start mongodb.serviceService status:
systemctl status mongodb.service
mongodb.service - An object/document-oriented database
Loaded: loaded (/lib/systemd/system/mongodb.service; disabled)
Active: active (running) since sáb 2014-09-13 21:08:10 VET; 2s ago
Docs: man:mongod(1)
Main PID: 5542 (mongod)
CGroup: /system.slice/mongodb.service
└─5542 /usr/bin/mongod --config /etc/mongodb.conf
sep 13 21:08:10 grievous systemd[1]: Starting An object/document-oriented database...
sep 13 21:08:10 grievous systemd[1]: Started An object/document-oriented database.
sep 13 21:08:10 grievous mongod[5542]: all output going to: /var/log/mongodb/mongodb.logCheck that the process is up:
ps aux | grep mongo
mongodb 5542 0.4 0.9 385176 38512 ? Ssl 21:08 0:01 /usr/bin/mongod --config /etc/mongodb.confCheck that the ports are open:
netstat -anp | grep mongo
tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN 5542/mongod
tcp 0 0 127.0.0.1:28017 0.0.0.0:* LISTEN 5542/mongod
unix 2 [ ACC ] STREAM LISTENING 138512 5542/mongod /tmp/mongodb-27017.socConnect to the mongodb server:
#mongo
MongoDB shell version: 2.4.10
connecting to: test
>Select a database:
> db
testShow the list of database names:
> show dbs
local 0.078125GBSwitch to a new database called pruebas:
> use pruebas
switched to db pruebasConfirm that the session switched to the pruebas database:
> db
pruebasShow the mongo help:
> 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 shellCreate 2 documents j and k using javascript syntax:
> j = {name: 'mongo'}
{ "name" : "mongo" }
> k = {x:3}
{ "x" : 3 }Insert the documents j and k into the testData collection:
> db.testData.insert( j )
> db.testData.insert( k )Confirm that the testData collection exists:
> show collections
system.indexes
testDataConfirm that the documents exist in the testData collection:
> db.testData.find()
{ "_id" : ObjectId("5414fdec21061053051d13e8"), "name" : "mongo" }
{ "_id" : ObjectId("5414fdf721061053051d13e9"), "x" : 3 }
Imprimir el json de j y k:
> printjson(j)
{ "name" : "mongo" }
> printjson(k)
{ "x" : 3 }In the next article I will explain how to work with mongo from python.
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