Revision 6a82f89f snf-pithos-backend/pithos/backends/lib/sqlalchemy/xfeatures.py
| b/snf-pithos-backend/pithos/backends/lib/sqlalchemy/xfeatures.py | ||
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from sqlalchemy.sql import select, and_ |
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from sqlalchemy.schema import Index |
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from sqlalchemy.sql.expression import desc |
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from sqlalchemy.exc import NoSuchTableError |
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from dbworker import DBWorker |
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def create_tables(engine): |
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metadata = MetaData() |
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columns=[] |
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columns.append(Column('feature_id', Integer, primary_key=True))
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columns.append(Column('path', String(2048)))
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xfeatures = Table('xfeatures', metadata, *columns, mysql_engine='InnoDB')
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# place an index on path |
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Index('idx_features_path', xfeatures.c.path, unique=True)
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columns=[] |
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columns.append(Column('feature_id', Integer,
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ForeignKey('xfeatures.feature_id',
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ondelete='CASCADE'), |
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primary_key=True)) |
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columns.append(Column('key', Integer, primary_key=True,
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autoincrement=False)) |
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columns.append(Column('value', String(256), primary_key=True))
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xfeaturevals = Table('xfeaturevals', metadata, *columns, mysql_engine='InnoDB')
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metadata.create_all(engine) |
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return metadata.sorted_tables |
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class XFeatures(DBWorker): |
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"""XFeatures are path properties that allow non-nested |
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def __init__(self, **params): |
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DBWorker.__init__(self, **params) |
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metadata = MetaData() |
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columns=[] |
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columns.append(Column('feature_id', Integer, primary_key=True))
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columns.append(Column('path', String(2048)))
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self.xfeatures = Table('xfeatures', metadata, *columns, mysql_engine='InnoDB')
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# place an index on path |
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Index('idx_features_path', self.xfeatures.c.path, unique=True)
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columns=[] |
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columns.append(Column('feature_id', Integer,
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ForeignKey('xfeatures.feature_id',
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ondelete='CASCADE'), |
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primary_key=True)) |
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columns.append(Column('key', Integer, primary_key=True,
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autoincrement=False)) |
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columns.append(Column('value', String(256), primary_key=True))
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self.xfeaturevals = Table('xfeaturevals', metadata, *columns, mysql_engine='InnoDB')
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metadata.create_all(self.engine) |
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try: |
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metadata = MetaData(self.engine) |
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self.xfeatures = Table('xfeatures', metadata, autoload=True)
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self.xfeaturevals = Table('xfeaturevals', metadata, autoload=True)
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except NoSuchTableError: |
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tables = create_tables(self.engine) |
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map(lambda t: self.__setattr__(t.name, t), tables) |
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# def xfeature_inherit(self, path): |
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# """Return the (path, feature) inherited by the path, or None.""" |
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