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Documentation
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Change Log
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==========
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Unreleased
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----------
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- Major new feature: building model queries using QuerySets
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- Refactor and expand the documentation
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- Add support for FixedString fields
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- Add support for more engine types: TinyLog, Log, Memory
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- Bug fix: Do not send readonly=1 when connection is already in readonly mode
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v0.8.2
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------
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- Fix broken Python 3 support (M1hacka)
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Migrations
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==========
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Over time, the ORM models in your application may change. Migrations provide a way to modify the database
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tables according to the changes in your models, without writing raw SQL.
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The migrations that were applied to the database are recorded in the ``infi_clickhouse_orm_migrations`` table,
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so migrating the database will only apply any missing migrations.
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Writing Migrations
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------------------
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To write migrations, create a Python package. Then create a python file for the initial migration. The migration
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files must begin with a four-digit number, and will be applied in sequence. For example::
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analytics
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+-- analytics_migrations
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+-- __init__.py
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+-- 0001_initial.py
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+-- 0002_add_user_agents_table.py
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Each migration file is expected to contain a list of ``operations``, for example::
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from infi.clickhouse_orm import migrations
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from analytics import models
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operations = [
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migrations.CreateTable(models.Visits),
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migrations.CreateTable(models.Visitors)
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]
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The following operations are supported:
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**CreateTable**
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A migration operation that creates a table for a given model class.
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**DropTable**
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A migration operation that drops the table of a given model class.
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**AlterTable**
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A migration operation that compares the table of a given model class to
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the model's fields, and alters the table to match the model. The operation can:
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- add new columns
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- drop obsolete columns
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- modify column types
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Default values are not altered by this operation.
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Running Migrations
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------------------
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To migrate a database, create a ``Database`` instance and call its ``migrate`` method with the package
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name containing your migrations::
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Database('analytics_db').migrate('analytics.analytics_migrations')
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Note that you may have more than one migrations package.
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Contributing
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============
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This project is hosted on GitHub - [https://github.com/Infinidat/infi.clickhouse_orm/](https://github.com/Infinidat/infi.clickhouse_orm/).
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Please open an issue there if you encounter a bug or want to request a feature.
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Pull requests are also welcome.
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Building
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--------
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After cloning the project, run the following commands:
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easy_install -U infi.projector
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cd infi.clickhouse_orm
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projector devenv build
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A `setup.py` file will be generate, which you can use to install the development version of the package:
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python setup.py install
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Tests
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-----
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To run the tests, ensure that the ClickHouse server is running on <http://localhost:8123/> (this is the default), and run:
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bin/nosetests
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---
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[<< System Models](system_models.md) | [Table of Contents](toc.md)
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[<< System Models](system_models.md) | [Table of Contents](toc.md) | [Class Reference >>](class_reference.md)
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@ -8,7 +8,7 @@ The migrations that were applied to the database are recorded in the `infi_click
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Writing Migrations
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------------------
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To write migrations, create a Python package. Then create a python file for the initial migration. The migration files must begin with a four-digit number, and will be applied in sequence. For example::
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To write migrations, create a Python package. Then create a python file for the initial migration. The migration files must begin with a four-digit number, and will be applied in sequence. For example:
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analytics
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+-- 0002_add_user_agents_table.py
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Each migration file is expected to contain a list of `operations`, for example::
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Each migration file is expected to contain a list of `operations`, for example:
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from infi.clickhouse_orm import migrations
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from analytics import models
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Running Migrations
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------------------
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To migrate a database, create a `Database` instance and call its `migrate` method with the package name containing your migrations::
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To migrate a database, create a `Database` instance and call its `migrate` method with the package name containing your migrations:
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Database('analytics_db').migrate('analytics.analytics_migrations')
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* [Partitions and Parts](system_models.md#partitions-and-parts)
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* [Contributing](contributing.md#contributing)
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* [Building](contributing.md#building)
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* [Tests](contributing.md#tests)
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* [Class Reference](class_reference.md#class-reference)
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* [infi.clickhouse_orm.database](class_reference.md#infi.clickhouse_orm.database)
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