Object mapper for Amazon DynamoDB
Project description
Dynamodb-mapper – a DynamoDB object mapper, based on boto.
Presentation
DynamoDB is a minimalistic NoSQL engine provided by Amazon as a part of their AWS product.
DynamoDB allows you to stores documents composed of unicode strings or numbers as well as sets of unicode strings and numbers. Each tables must define a hash key and may define a range key. All other fields are optional.
Dynamodb-mapper brings a tiny abstraction layer over DynamoDB to overcome some of the limitations with no performance compromise. It is highly inspired by the mature MoongoKit project
Full documentation: http://dynamodb-mapper.readthedocs.org/en/latest/
Report bugs: https://bitbucket.org/Ludia/dynamodb-mapper/issues
Requirements
Boto = 2.6.0
AWS account
Highlights
Python <–> DynamoDB type mapping
Dramatic performance improvements (new in 1.8.0)
Deep schema definition and validation with Onctuous (new in 1.8.0)
Multi-target transaction (new in 1.6.0)
Sub-transactions (new in 1.6.2)
Migration engine (new in 1.7.0)
Smart conflict detection (new in 1.7.0)
Full low-level chunking abstraction for scan, query and get_batch
Default values
Auto-inc hash_key
Framework agnostic
Example usage
We assume you’ve correctly set your Boto credentials or use ddbmock.
Quick install
$ pip install dynamodb-mapper
If you have not yet configured Boto, you may simply
$ export AWS_ACCESS_KEY_ID=<your id key here> $ export AWS_SECRET_ACCESS_KEY=<your secret key here>
First Model
from dynamodb_mapper.model import DynamoDBModel
class DoomMap(DynamoDBModel):
__table__ = u"doom_map"
__hash_key__ = u"episode"
__range_key__ = u"map"
__schema__ = {
u"episode": int,
u"map": int,
u"name": unicode,
u"cheats": set,
}
__defaults__ = {
"cheats": set([u"Konami"]),
}
Initial Table creation
from dynamodb_mapper.model import ConnectionBorg conn = ConnectionBorg() conn.create_table(DoomMap, 10, 10, wait_for_active=True)
Model Usage
e1m1 = DoomMap()
e1m1.episode = 1
e1m1.map = 1
e1m1.name = u"Hangar"
e1m1.cheats = set([u"idkfa", u"iddqd", u"idclip"])
e1m1.save()
# Later on, retrieve that same object from the DB...
e1m1 = DoomMap.get(1, 1)
# query all maps of episode 1
e1_maps = DoomMap.query(hash_key=1)
# query all maps of episode 1 with 'map' hash_key > 5
from boto.dynamodb.condition import GT
e1_maps_after_5 = DoomMap.query(
hash_key=1,
range_key_condition=GT(5))
Contribute
Want to contribute, report a but of request a feature ? The development goes on at Ludia’s BitBucket account:
Dynamodb-mapper
Report bugs: https://bitbucket.org/Ludia/dynamodb-mapper/issues
Fork the code: https://bitbucket.org/Ludia/dynamodb-mapper/overview
Onctuous
Full documentation: https://onctuous.readthedocs.org/en/latest
Report bugs: https://bitbucket.org/Ludia/onctuous/issues
Download: http://pypi.python.org/pypi/onctuous
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