Infinidat/infi.clickhouse_orm
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README extended

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emakarov 2017-02-07 20:54:39 +03:00
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README.rst
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@ -271,6 +271,30 @@ For a ``SummingMergeTree`` you can optionally specify the summing columns::
engine = engines.SummingMergeTree('EventDate', ('OrderID', 'EventDate', 'BannerID'),
summing_cols=('Shows', 'Clicks', 'Cost'))
A ``Buffer`` engine is available for BufferModels. (See below how to use BufferModel). You can specify following parameters::
engine = engines.Buffer(Person) # you need to initialize engine with main Model. Other default parameters will be used
# or:
engine = engines.Buffer(Person, table, num_layers=16, min_time=10, max_time=100, min_rows=10000, max_rows=1000000, min_bytes=10000000, max_bytes=100000000):
Buffer Models
-------------
Here's how you can define Model for Buffer Engine. The Buffer Model should be inherited from models.BufferModel and main model
Main model also should be specified in class::
class PersonBuffer(models.BufferModel, Person):
main_model = Person
engine = engines.Buffer(Person)
Then you can insert objects into Buffer model and they will be handled by Clickhouse properly::
db.create_table(PersonBuffer)
suzy = PersonBuffer(first_name='Suzy', last_name='Jones')
dan = PersonBuffer(first_name='Dan', last_name='Schwartz')
db.insert([dan, suzy])
Data Replication
****************
@ -291,4 +315,4 @@ After cloning the project, run the following commands::
To run the tests, ensure that the ClickHouse server is running on http://localhost:8123/ (this is the default), and run::
bin/nosetests
bin/nosetests