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74 lines
2.2 KiB
Python
74 lines
2.2 KiB
Python
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# -*- coding: utf-8 -*-
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'''
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Database object store.
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The shove psuedo-URL used for database object stores is the format used by
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SQLAlchemy:
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<driver>://<username>:<password>@<host>:<port>/<database>
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<driver> is the database engine. The engines currently supported SQLAlchemy are
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sqlite, mysql, postgres, oracle, mssql, and firebird.
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<username> is the database account user name
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<password> is the database accound password
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<host> is the database location
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<port> is the database port
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<database> is the name of the specific database
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For more information on specific databases see:
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http://www.sqlalchemy.org/docs/dbengine.myt#dbengine_supported
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'''
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try:
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from sqlalchemy import MetaData, Table, Column, String, Binary, select
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from shove import BaseStore, DbBase
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except ImportError:
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raise ImportError('Requires SQLAlchemy >= 0.4')
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class DbStore(BaseStore, DbBase):
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'''Database cache backend.'''
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def __init__(self, engine, **kw):
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super(DbStore, self).__init__(engine, **kw)
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# Get tablename
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tablename = kw.get('tablename', 'store')
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# Bind metadata
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self._metadata = MetaData(engine)
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# Make store table
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self._store = Table(tablename, self._metadata,
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Column('key', String(255), primary_key=True, nullable=False),
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Column('value', Binary, nullable=False),
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)
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# Create store table if it does not exist
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if not self._store.exists():
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self._store.create()
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def __getitem__(self, key):
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row = select(
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[self._store.c.value], self._store.c.key == key,
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).execute().fetchone()
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if row is not None:
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return self.loads(str(row.value))
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raise KeyError(key)
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def __setitem__(self, k, v):
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v, store = self.dumps(v), self._store
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# Update database if key already present
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if k in self:
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store.update(store.c.key == k).execute(value=v)
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# Insert new key if key not present
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else:
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store.insert().execute(key=k, value=v)
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def keys(self):
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'''Returns a list of keys in the store.'''
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return list(i[0] for i in select(
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[self._store.c.key]
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).execute().fetchall())
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__all__ = ['DbStore']
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