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README.md

tableschema-sql-py

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Generate and load SQL tables based on Table Schema descriptors.

Features

  • implements tableschema.Storage interface
  • provides additional features like indexes and updating

Contents

Getting Started

Installation

The package use semantic versioning. It means that major versions could include breaking changes. It's highly recommended to specify package version range in your setup/requirements file e.g. package>=1.0,<2.0.

pip install tableschema-sql

Documentation

from tableschema import Table
from sqlalchemy import create_engine

# Create sqlalchemy engine
engine = create_engine('sqlite://')

# Save package to SQL
package = Package('datapackage.json')
package.save(storage='sql', engine=engine)

# Load package from SQL
package = Package(storage='sql', engine=engine)
package.resources

API Reference

Storage

Storage(self, engine, dbschema=None, prefix='', reflect_only=None, autoincrement=None)

SQL storage

Package implements Tabular Storage interface (see full documentation on the link):

Storage

Only additional API is documented

Arguments

  • engine (object): sqlalchemy engine
  • dbschema (str): name of database schema
  • prefix (str): prefix for all buckets
  • reflect_only (callable): a boolean predicate to filter the list of table names when reflecting
  • autoincrement (str/dict): add autoincrement column at the beginning. - if a string it's an autoincrement column name - if a dict it's an autoincrements mapping with column names indexed by bucket names, for example, {'bucket1': 'id', 'bucket2': 'other_id}

storage.create

storage.create(self, bucket, descriptor, force=False, indexes_fields=None)

Create bucket

Arguments

  • indexes_fields (str[]): list of tuples containing field names, or list of such lists

storage.write

storage.write(self, bucket, rows, keyed=False, as_generator=False, update_keys=None, buffer_size=1000, use_bloom_filter=True)

Write to bucket

Arguments

  • keyed (bool): accept keyed rows
  • as_generator (bool): returns generator to provide writing control to the client
  • update_keys (str[]): update instead of inserting if key values match existent rows
  • buffer_size (int=1000): maximum number of rows to try and write to the db in one batch
  • use_bloom_filter (bool=True): should we use a bloom filter to optimize DB update performance (in exchange for some setup time)

Contributing

The project follows the Open Knowledge International coding standards.

Recommended way to get started is to create and activate a project virtual environment. To install package and development dependencies into active environment:

$ make install

To run tests with linting and coverage:

$ make test

Changelog

Here described only breaking and the most important changes. The full changelog and documentation for all released versions could be found in nicely formatted commit history.

v1.3

  • Implemented constraints loading to a database

v1.2

  • Add option to configure buffer size, bloom filter use (#77)

v1.1

  • Added support for the autoincrement parameter to be a mapping
  • Fixed autoincrement support for SQLite and MySQL

v1.0

  • Initial driver implementation.

About

Generate SQL tables, load and extract data, based on JSON Table Schema descriptors.

Resources

License

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