pyorient

[] (https://travis-ci.org/Ostico/pyorient)

Orientdb driver for python that uses the binary protocol.

Pyorient works with orientdb version 1.7 and later.

Warning Some issues are experimented with record_create/record_upload and OrientDB < 2.0. These command are strongly discouraged with these versions

Installation

pip install pyorient

Testing

To run the tests you need nose

pip install nose

then you can run tests with:

nosetests 

Usage

A full range of commands will be available soon, for now you have to read the tests.

Init the client

client = pyorient.OrientDB("localhost", 2424)
session_id = client.connect( "admin", "admin" )

Create a DB

client.db_create( db_name, pyorient.DB_TYPE_GRAPH, pyorient.STORAGE_TYPE_MEMORY )

Check if a DB exists

client.db_exists( db_name, pyorient.STORAGE_TYPE_MEMORY )

Open a DB

client.db_open( db_name, "admin", "admin" )

Close a DB and destroy the connection ( by OrientDB design )

client.db_close()

Get the the list of databases ( needs to be connected )

client.db_list()

Get the size of a database ( needs a DB opened )

client.db_size()

Get the number of records in a database in the OrientDB Server instance

client.db_count_records()

Send a command

cluster_id = client.command( "create class my_class extends V" )
client.command( 
    "insert into my_class ( 'accommodation', 'work', 'holiday' ) values( 'B&B', 'garage', 'mountain' )"
)

Create a record

Warning Some issues are experimented with record_create/record_upload and OrientDB < 2.0. These command are strongly discouraged with these versions

rec = { '@my_class': { 'accommodation': 'house', 'work': 'office', 'holiday': 'sea' } }
rec_position = client.record_create( cluster_id, rec )

Update a record

Warning Some issues are experimented with record_create/record_upload and OrientDB < 2.0. These command are strongly discouraged with these versions

rec3 = { '@my_class': { 'accommodation': 'hotel', 'work': 'home', 'holiday': 'hills' } }
update_success = client.record_update( rec_position._rid, rec_position._rid, rec3, rec_position._version )

Load a record

client.record_load( rec_position._rid )

Load a record with cache

def _my_callback(for_every_record):
    print(for_every_record)

client.record_load( rec_position._rid, "*:-1", _my_callback )

Make a query

result = client.query("select from my_class", 10, '*:0')

Make an Async query

def _my_callback(for_every_record):
    print(for_every_record)

result = client.query_async("select from my_class", 10, '*:0', _my_callback)

Delete a record

client.record_delete( cluster_id, rec_position._rid )

Drop a DB

client.db_drop( db_name )

Create a new cluster

new_cluster_id = client.data_cluster_add(
    'my_cluster_1234567', pyorient.CLUSTER_TYPE_PHYSICAL
)

Reload DB ( refresh clusters info )

client.db_reload()

Get the range of record ids for a cluster

client.data_cluster_data_range( new_cluster_id )

Get the number of records in one or more clusters

client.data_cluster_count( [ 1, 2, 3, 4, 11 ] )

Drop a data cluster

client.data_cluster_drop( new_cluster_id )

Shut down the server. Requires "shutdown" permission to be set in orientdb-server-config.xml file

client.shutdown( "root", "a_super_secret_password" )

Transactions

# use a cluster
cluster_id = 3

# execute real create to get some info
rec = { 'accommodation': 'mountain hut', 'work': 'not!', 'holiday': 'lake' }
rec_position = client.record_create( cluster_id, rec )
	
tx = client.tx_commit()
tx.begin()
	
# create a new record
rec1 = { 'accommodation': 'home', 'work': 'some work', 'holiday': 'surf' }
rec_position1 = client.record_create( -1, rec1 )
	
# prepare for an update
rec2 = { 'accommodation': 'hotel', 'work': 'office', 'holiday': 'mountain' }
update_record = client.record_update( cluster_id, rec_position._rid, rec2, rec_position._version )

tx.attach( rec_position1 )
tx.attach( rec_position1 )
tx.attach( update_record )
res = tx.commit()

assert res["#3:1"].holiday == 'mountain'
assert res["#3:2"].holiday == 'surf'
assert res["#3:3"].holiday == 'surf'

Execute OrientDB SQL Batch

cmd = ("begin;"
    "let a = create vertex set script = true;"
    "let b = select from v limit 1;"
    "let e = create edge from $a to $b;"
    "commit retry 100;")

    edge_result = self.client.batch(cmd)

Persistent Connections ( Session Token )

Since version 27 is introduced an extension to allow use a token based session. This functionality must be enabled on the server config.

• In the first negotiation the client can ask for a token based authentication using the client.set_session_token method.
• The server will reply with a token or with an empty string meaning that it not support token based session and is using an old style session.
• For each request, the client will send the token and eventually it will get a new one if token lifetime ends.

When using the token based authentication, the connections can be shared between users of the same server.

client = pyorient.OrientDB("localhost", 2424)
client.set_session_token( True )  # set true to enable the token based 
authentication
client.db_open( "GratefulDeadConcerts", "admin", "admin" )

# store this token somewhere
sessionToken = client.get_session_token()

#destroy the old client, equals to another user/socket/ip ecc.
del client

# create a new client
client = pyorient.OrientDB("localhost", 2424)

# set the previous obtained token to re-attach to the old session
client.set_session_token( sessionToken ) 

#now the dbOpen is not needed to perform database operations
record = client.query( 'select from V where @rid = #9:1' )

#set the flag again to true if you want to renew the token
client.set_session_token( True )  # set true
client.db_open( "GratefulDeadConcerts", "admin", "admin" )
new_sessionToken = client.get_session_token()

assert sessionToken != new_sessionToken

A GRAPH Example

The GRAPH representation of animals and its food

import pyorient
client = pyorient.OrientDB("localhost", 2424)  # host, port

# open a connection (username and password)
client.connect("admin", "admin")

# create a database
client.db_create("animals", pyorient.DB_TYPE_GRAPH, pyorient.STORAGE_TYPE_MEMORY)

# select to use that database
client.db_open("animals", "admin", "admin")

# Create the Vertex Animal
client.command("create class Animal extends V")

# Insert a new value
client.command("insert into Animal set name = 'rat', specie = 'rodent'")

# query the values 
client.query("select * from Animal")
[<OrientRecord at 0x7f>..., ...]

# Create the vertex and insert the food values

client.command('create class Food extends V')
client.command("insert into Food set name = 'pea', color = 'green'")

# Create the edge for the Eat action
client.command('create class Eat extends E')

# Lets the rat likes to eat pea
eat_edges = client.command(
    "create edge Eat from ("
    "select from Animal where name = 'rat'"
    ") to ("
    "select from Food where name = 'pea'"
    ")"
)
 
# Who eats the peas?
pea_eaters = client.command("select expand( in( Eat )) from Food where name = 'pea'")
for animal in pea_eaters:
    print(animal.name, animal.specie)
'rat rodent'
...

# What each animal eats?
animal_foods = client.command("select expand( out( Eat )) from Animal")
for food in animal_foods:
    animal = client.query(
                "select name from ( select expand( in('Eat') ) from Food where name = 'pea' )"
            )[0]
    print(food.name, food.color, animal.name)
'pea green rat'

Contributions

• Fork the project.
• Make your changes.
• Add tests for it. This is important so I don't break it in a future version unintentionally.
• Send me a pull request.
• ???
• PROFIT

Authors

• mogui
• ostico

Copyright

Copyright (c) 2014 Niko Usai, Domenico Lupinetti. See LICENSE for details.