Abhiroop萨卡,
我强烈建议你通过所有的文档在阅读:
CQLEngine Documentation
而且通过CQLEngine,rustyrazorblade的创作者来看看这个例子项目:
Example Project - Meat bot
请记住,CQLEngine已合并我n要在DataStax卡桑德拉司机:
Official Python Cassandra Driver Documentation
你会想要做这样的事情:
CQLEngine < = 0.21。0:
from cqlengine.connection import setup
setup(['127.0.0.1'], 'keyspace_name', retry_connect=True)
如果需要仍将继续创建密钥空间:
from cqlengine.management import create_keyspace
create_keyspace(
'keyspace_name',
replication_factor=1,
strategy_class='SimpleStrategy'
)
设置你的Cassandra的数据模型
您可以在同一的.py或在你的模型做.py:
import datetime
import uuid
from cqlengine import columns, Model
class YourModel(Model):
__key_space__ = 'keyspace_name' # Not Required
__table_name__ = 'columnfamily_name' # Not Required
some_int = columns.Integer(
primary_key=True,
partition_key=True
)
time = columns.TimeUUID(
primary_key=True,
clustering_order='DESC',
default=uuid.uuid1,
)
some_uuid = columns.UUID(primary_key=True, default=uuid.uuid4)
created = columns.DateTime(default=datetime.datetime.utcnow)
some_text = columns.Text(required=True)
def __unicode__(self):
return unicode(self.sometext)
def to_dict(self):
data = {
'text': self.some_text,
'created': self.created,
'some_int': self.some_int,
}
return data
个同步您的卡珊德拉ColumnFamilies
from cqlengine.management import sync_table
from .models import YourModel
sync_table(YourModel)
考虑到上述的一切,你可以把所有的连接和同步在一起,因为许多例子已经列出,说这是在我们的项目connection.py:
from cqlengine.connection import setup
from cqlengine.management import sync_table
from .models import YourTable
def cass_connect():
setup(['127.0.0.1'], 'keyspace_name', retry_connect=True)
sync_table(YourTable)
实际使用的模型和数据
from .connection import cass_connect
from .models import YourTable
def add_data():
cass_connect()
YourTable.create(
some_int=5,
some_text='Test0'
)
YourTable.create(
some_int=6,
some_text='Test1'
)
YourTable.create(
some_int=5,
some_text='Test2'
)
def query_data():
cass_connect()
query = YourTable.objects.filter(some_int=5)
# This will output each YourTable entry where some_int = 5
for item in query:
print item
随时让如有必要,请求进一步澄清。