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SQLAlchemy integration for cone.app

Project description

cone.sql

This package provides SQLAlchemy integration in cone.app and basic application nodes for publishing SQLAlchemy models.

Installation

Include cone.sql to install dependencies in your application’s setup.py.

Configure Database and WSGI

Adopt your application config ini file to define database location and hook up the related elements to the WSGI pipeline.

[app:my_app]
use = egg:cone.app#main

cone.plugins =
    cone.sql

cone.sql.dbinit.url = sqlite:///%(here)s/var/sqlite/my_db.db

[filter:remote_addr]
# for use behind nginx
use = egg:cone.app#remote_addr

[filter:tm]
use = egg:repoze.tm2#tm
commit_veto = repoze.tm:default_commit_veto

[filter:session]
use = egg:cone.sql#session
sqlalchemy.url = sqlite:///%(here)s/var/sqlite/my_db.db

[pipeline:main]
pipeline =
    remote_addr
    egg:repoze.retry#retry
    tm
    session
    my_app

Create Model and Nodes

Define the SQLAlchemy model.

from cone.sql import SQLBase
from cone.sql.model import GUID
from sqlalchemy import Column
from sqlalchemy import String

class MyRecord(SQLBase):
    __tablename__ = 'my_table'
    uid_key = Column(GUID, primary_key=True)
    field = Column(String)

Define an application node which represents the SQL row and uses the SQLAlchemy model. The class holds a reference to the related SQLAlchemy model.

from cone.sql.model import SQLRowNode

class MyNode(SQLRowNode):
    record_class = MyRecord

Define an application node which represents the table and acts as container for the SQL row nodes. The class holds a reference to the related SQLAlchemy model and the related SQLRowNode.

from cone.sql.model import SQLTableNode

class MyContainer(SQLTableNode):
    record_class = MyRecord
    child_factory = MyNode

Primary key handling

The node name maps to the primary key of the SQLAlchemy model (currenly no multiple primary keys are supported). Node names are converted to the primary key data type automatically. The conversion factories are defined at SQLTableNode.data_type_converters which can be extended by more data types if needed.

>>> SQLTableNode.data_type_converters
{<class 'sqlalchemy.sql.sqltypes.String'>: <type 'unicode'>,
<class 'cone.sql.model.GUID'>: <class 'uuid.UUID'>,
<class 'sqlalchemy.sql.sqltypes.Integer'>: <type 'int'>}

Integrate to the Application Model

In order to publish a SQL table node, the table node must be hooked up to the application model. To hook up the at root level, register it as entry.

import cone.app

cone.app.register_entry('container', MyContainer)

Session setup handlers

There exists a sql_session_setup decorator which can be used to perform session setup tasks like registering SQLAlchemy event listeners.

from cone.sql import sql_session_setup
from sqlalchemy import event

def after_flush(session, flush_context):
    """Do something after flush.
    """

@sql_session_setup
def bind_session_listener(session):
    """SQL session setup callback.
    """
    event.listen(session, 'after_flush', after_flush)

Query the database

Querying the database is done via SQLAlchemy. You can acquire the session from request via get_session and perform arbitrary operations on it.

from cone.sql import get_session

session = get_session(request)
result = session.query(MyRecord).all()

TODO

  • Support multiple primary keys.

Test coverage

Summary of the test coverage report:

lines   cov%   module
   50   100%   cone.sql.__init__
  186    99%   cone.sql.model
   57   100%   cone.sql.testing
   18   100%   cone.sql.tests

Contributors

  • Robert Niederreiter (Author)

Changes

0.1 (2017-03-28)

  • Initial work. [rnix, 2017-18-01]

License

Copyright (c) 2017, BlueDynamics Alliance, Austria All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  • Neither the name of the BlueDynamics Alliance nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY BlueDynamics Alliance AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BlueDynamics Alliance BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Project details


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This version

0.1

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