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alembic-offline-1.2.0


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توضیحات

Offline extensions for alemic database migration framework
ویژگی مقدار
سیستم عامل -
نام فایل alembic-offline-1.2.0
نام alembic-offline
نسخه کتابخانه 1.2.0
نگهدارنده []
ایمیل نگهدارنده []
نویسنده Anatoly Bubenkov, Paylogic International and others
ایمیل نویسنده developers@paylogic.com
آدرس صفحه اصلی https://github.com/paylogic/alembic-offline
آدرس اینترنتی https://pypi.org/project/alembic-offline/
مجوز MIT license
alembic-offline =============== .. image:: https://api.travis-ci.org/paylogic/alembic-offline.png :target: https://travis-ci.org/paylogic/alembic-offline .. image:: https://pypip.in/v/alembic-offline/badge.png :target: https://crate.io/packages/alembic-offline/ .. image:: https://coveralls.io/repos/paylogic/alembic-offline/badge.svg?branch=master :target: https://coveralls.io/r/paylogic/alembic-offline?branch=master .. image:: https://readthedocs.org/projects/alembic-offline/badge/?version=latest :alt: Documentation Status :scale: 100% :target: https://readthedocs.org/projects/alembic-offline/ alembic-offline is an extension for alemic to enrich offline functionality of the migrations .. contents:: Usage ----- Phased migrations ^^^^^^^^^^^^^^^^^ alembic-offline introduces a helper which allows to implement phased migrations, e.g. those which steps are divided into logical phases. For example, you can have steps to be executed before code deploy and those after. In your alembic config file (main section): :: phases = before-deploy after-deploy final default-phase = after-deploy In your version file: .. code-block:: python from sqlalchemy import INTEGER, VARCHAR, NVARCHAR, TIMESTAMP, Column, func from alembic import op from alembic_offline import phased, execute_script from tests.migrations.scripts import script revision = '1' down_revision = None @phased def upgrade(): op.create_table( 'account', Column('id', INTEGER, primary_key=True), Column('name', VARCHAR(50), nullable=False), Column('description', NVARCHAR(200)), Column('timestamp', TIMESTAMP, server_default=func.now()) ) yield op.execute("update account set name='some'") yield execute_script(script.__file__) def downgrade(): pass Will give the sql output (for sqlite): .. code-block:: sql -- Running upgrade -> 1 -- PHASE::before-deploy::; CREATE TABLE account ( id INTEGER NOT NULL, name VARCHAR(50) NOT NULL, description NVARCHAR(200), timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (id) ); -- PHASE::after-deploy::; update account set name='some'; -- PHASE::final::; -- SCRIPT::scripts/script.py::; INSERT INTO alembic_version (version_num) VALUES ('1'); As you see, phases are rendered as SQL comments to divide migration steps, so those who execute migration can see which phase's step it is. However, if migration procedure is highly customized, you can use alembic-offline API described below. `get_migration_data` returns migration phases in special form so you can automate their execution. Arbitrary script as operation ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ For complex migrations, it's not enough to execute sql, you might need some script to be executed instead. For that, there's special operation: .. code-block:: python from alembic_offline import execute_script def upgrade(): execute_script('scripts/script.py') If you'll get migration sql, it will be rendered as SQL comment: .. code-block:: sql -- SCRIPT::scripts/script.py::; For those who execute migrations it will be visible and they can execute the script manually. However, if migration procedure is highly customized, you can use alembic-offline API described below. `get_migration_data` returns script migration steps in special form so you can automate their execution. For online mode, the script will be executed as subprocess via python `subprocess` module. Get migration data ^^^^^^^^^^^^^^^^^^ alembic-offline provides specialized API to get certain migration data as dictionary: .. code-block:: python from alembic_offline import get_migration_data from alemic.config import Config config = Config('path to alemic.ini') data = get_migration_data(config, 'your-revision') assert data == { 'revision': 'your-revision', 'phases': { 'after-deploy': [ { 'type': 'mysql', 'script': 'alter table account add column name VARCHAR(255)' }, { 'type': 'python', 'script': 'from app.models import Session, Account; Session.add(Account()); Session.commit()', 'path': 'scripts/my_script.py' }, ] } } `get_migration_data` requires both `phases` and `default-phase` configuration options to be set. `default-phase` is needed to be able to get migration data even for simple migrations without phases. Get migration data in batch ^^^^^^^^^^^^^^^^^^^^^^^^^^^ alembic-offline provides an API call to get migration data for all revisions: .. code-block:: python from alembic_offline import get_migrations_data from alemic.config import Config config = Config('path to alemic.ini') data = get_migrations_data(config) assert data == [ { 'revision': 'your-revision', 'phases': { 'after-deploy': [ { 'type': 'mysql', 'script': 'alter table account add column name VARCHAR(255)' }, { 'type': 'python', 'script': 'from app.models import Session, Account; Session.add(Account()); Session.commit()', 'path': 'scripts/my_script.py' }, ] } } ] Command line utilities ^^^^^^^^^^^^^^^^^^^^^^ Because with alembic revisions it's sometimes hard to find which the correct down revision should be; especially when there are multiple heads we added the alembic-offline graph command. The graph command will generate a `dot file <https://en.wikipedia.org/wiki/DOT_(graph_description_language)>`_ of the revisions, this file can then be converted to an image for easy visualization. Usage: :: alembic-offline graph --filename revisions.dot --alembic-config path/to/alembic.ini Then if you have `graphviz <https://en.wikipedia.org/wiki/Graphviz>`_ installed you can run: :: dot -Tpng -o revisions.png revisions.dot To generate a png image. Contact ------- If you have questions, bug reports, suggestions, etc. please create an issue on the `GitHub project page <http://github.com/paylogic/alembic-offline>`_. License ------- This software is licensed under the `MIT license <http://en.wikipedia.org/wiki/MIT_License>`_ Please refer to the `license file <https://github.com/paylogic/alembic-offline/blob/master/LICENSE.txt>`_ © 2015 Anatoly Bubenkov, Paylogic International and others. Changelog ========= 1.2.0 ----- * add migration dependency tree generation command (hvdklauw) 1.1.0 ----- * add down_revision to migration data (bubenkoff) * reverse migration order to simplify the application (bubenkoff) 1.0.5 ----- * correctly handle multi-phased migration data extraction (bubenkoff) 1.0.4 ----- * online script execution implemented (bubenkoff) * `get_migrations_data` API (bubenkoff) 1.0.3 ----- * Added arbitrary script operation (bubenkoff) * Strict phases configuration assertions for phased migration decorator (bubenkoff) * `get_migration_data` API (bubenkoff) 1.0.0 ----- * Initial public release (bubenkoff)


نحوه نصب


نصب پکیج whl alembic-offline-1.2.0:

    pip install alembic-offline-1.2.0.whl


نصب پکیج tar.gz alembic-offline-1.2.0:

    pip install alembic-offline-1.2.0.tar.gz