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"""
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Schema module providing common schema operations.
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"""
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import warnings
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from UserDict import DictMixin
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import sqlalchemy
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from sqlalchemy.schema import ForeignKeyConstraint
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from sqlalchemy.schema import UniqueConstraint
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from migrate.exceptions import *
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from migrate.changeset import SQLA_06
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from migrate.changeset.databases.visitor import (get_engine_visitor,
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run_single_visitor)
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__all__ = [
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'create_column',
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'drop_column',
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'alter_column',
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'rename_table',
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'rename_index',
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'ChangesetTable',
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'ChangesetColumn',
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'ChangesetIndex',
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'ChangesetDefaultClause',
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'ColumnDelta',
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]
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DEFAULT_ALTER_METADATA = True
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def create_column(column, table=None, *p, **kw):
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"""Create a column, given the table.
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API to :meth:`ChangesetColumn.create`.
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"""
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if table is not None:
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return table.create_column(column, *p, **kw)
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return column.create(*p, **kw)
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def drop_column(column, table=None, *p, **kw):
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"""Drop a column, given the table.
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API to :meth:`ChangesetColumn.drop`.
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"""
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if table is not None:
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return table.drop_column(column, *p, **kw)
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return column.drop(*p, **kw)
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def rename_table(table, name, engine=None, **kw):
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"""Rename a table.
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If Table instance is given, engine is not used.
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API to :meth:`ChangesetTable.rename`.
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:param table: Table to be renamed.
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:param name: New name for Table.
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:param engine: Engine instance.
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:type table: string or Table instance
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:type name: string
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:type engine: obj
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"""
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table = _to_table(table, engine)
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table.rename(name, **kw)
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def rename_index(index, name, table=None, engine=None, **kw):
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"""Rename an index.
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If Index instance is given,
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table and engine are not used.
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API to :meth:`ChangesetIndex.rename`.
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:param index: Index to be renamed.
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:param name: New name for index.
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:param table: Table to which Index is reffered.
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:param engine: Engine instance.
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:type index: string or Index instance
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:type name: string
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:type table: string or Table instance
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:type engine: obj
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"""
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index = _to_index(index, table, engine)
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index.rename(name, **kw)
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def alter_column(*p, **k):
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"""Alter a column.
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This is a helper function that creates a :class:`ColumnDelta` and
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runs it.
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:argument column:
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The name of the column to be altered or a
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:class:`ChangesetColumn` column representing it.
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:param table:
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A :class:`~sqlalchemy.schema.Table` or table name to
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for the table where the column will be changed.
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:param engine:
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The :class:`~sqlalchemy.engine.base.Engine` to use for table
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reflection and schema alterations.
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:param alter_metadata:
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If `True`, which is the default, the
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:class:`~sqlalchemy.schema.Column` will also modified.
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If `False`, the :class:`~sqlalchemy.schema.Column` will be left
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as it was.
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:returns: A :class:`ColumnDelta` instance representing the change.
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"""
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k.setdefault('alter_metadata', DEFAULT_ALTER_METADATA)
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if 'table' not in k and isinstance(p[0], sqlalchemy.Column):
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k['table'] = p[0].table
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if 'engine' not in k:
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k['engine'] = k['table'].bind
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# deprecation
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if len(p) >= 2 and isinstance(p[1], sqlalchemy.Column):
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warnings.warn(
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"Passing a Column object to alter_column is deprecated."
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" Just pass in keyword parameters instead.",
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MigrateDeprecationWarning
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)
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engine = k['engine']
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delta = ColumnDelta(*p, **k)
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visitorcallable = get_engine_visitor(engine, 'schemachanger')
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engine._run_visitor(visitorcallable, delta)
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return delta
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def _to_table(table, engine=None):
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"""Return if instance of Table, else construct new with metadata"""
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if isinstance(table, sqlalchemy.Table):
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return table
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# Given: table name, maybe an engine
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meta = sqlalchemy.MetaData()
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if engine is not None:
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meta.bind = engine
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return sqlalchemy.Table(table, meta)
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def _to_index(index, table=None, engine=None):
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"""Return if instance of Index, else construct new with metadata"""
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if isinstance(index, sqlalchemy.Index):
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return index
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# Given: index name; table name required
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table = _to_table(table, engine)
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ret = sqlalchemy.Index(index)
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ret.table = table
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return ret
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class ColumnDelta(DictMixin, sqlalchemy.schema.SchemaItem):
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"""Extracts the differences between two columns/column-parameters
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May receive parameters arranged in several different ways:
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* **current_column, new_column, \*p, \*\*kw**
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Additional parameters can be specified to override column
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differences.
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* **current_column, \*p, \*\*kw**
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Additional parameters alter current_column. Table name is extracted
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from current_column object.
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Name is changed to current_column.name from current_name,
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if current_name is specified.
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* **current_col_name, \*p, \*\*kw**
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Table kw must specified.
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:param table: Table at which current Column should be bound to.\
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If table name is given, reflection will be used.
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:type table: string or Table instance
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:param alter_metadata: If True, it will apply changes to metadata.
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:type alter_metadata: bool
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:param metadata: If `alter_metadata` is true, \
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metadata is used to reflect table names into
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:type metadata: :class:`MetaData` instance
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:param engine: When reflecting tables, either engine or metadata must \
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be specified to acquire engine object.
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:type engine: :class:`Engine` instance
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:returns: :class:`ColumnDelta` instance provides interface for altered attributes to \
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`result_column` through :func:`dict` alike object.
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* :class:`ColumnDelta`.result_column is altered column with new attributes
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* :class:`ColumnDelta`.current_name is current name of column in db
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"""
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# Column attributes that can be altered
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diff_keys = ('name', 'type', 'primary_key', 'nullable',
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'server_onupdate', 'server_default', 'autoincrement')
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diffs = dict()
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__visit_name__ = 'column'
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def __init__(self, *p, **kw):
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self.alter_metadata = kw.pop("alter_metadata", False)
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self.meta = kw.pop("metadata", None)
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self.engine = kw.pop("engine", None)
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# Things are initialized differently depending on how many column
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# parameters are given. Figure out how many and call the appropriate
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# method.
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if len(p) >= 1 and isinstance(p[0], sqlalchemy.Column):
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# At least one column specified
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if len(p) >= 2 and isinstance(p[1], sqlalchemy.Column):
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# Two columns specified
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diffs = self.compare_2_columns(*p, **kw)
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else:
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# Exactly one column specified
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diffs = self.compare_1_column(*p, **kw)
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else:
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# Zero columns specified
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if not len(p) or not isinstance(p[0], basestring):
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raise ValueError("First argument must be column name")
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diffs = self.compare_parameters(*p, **kw)
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self.apply_diffs(diffs)
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def __repr__(self):
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return '<ColumnDelta altermetadata=%r, %s>' % (self.alter_metadata,
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super(ColumnDelta, self).__repr__())
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def __getitem__(self, key):
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if key not in self.keys():
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raise KeyError("No such diff key, available: %s" % self.diffs)
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return getattr(self.result_column, key)
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def __setitem__(self, key, value):
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if key not in self.keys():
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raise KeyError("No such diff key, available: %s" % self.diffs)
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setattr(self.result_column, key, value)
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def __delitem__(self, key):
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raise NotImplementedError
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def keys(self):
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return self.diffs.keys()
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def compare_parameters(self, current_name, *p, **k):
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"""Compares Column objects with reflection"""
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self.table = k.pop('table')
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self.result_column = self._table.c.get(current_name)
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if len(p):
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k = self._extract_parameters(p, k, self.result_column)
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return k
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def compare_1_column(self, col, *p, **k):
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"""Compares one Column object"""
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self.table = k.pop('table', None)
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if self.table is None:
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self.table = col.table
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self.result_column = col
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if len(p):
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k = self._extract_parameters(p, k, self.result_column)
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return k
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def compare_2_columns(self, old_col, new_col, *p, **k):
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"""Compares two Column objects"""
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self.process_column(new_col)
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self.table = k.pop('table', None)
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|
# we cannot use bool() on table in SA06
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if self.table is None:
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self.table = old_col.table
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if self.table is None:
|
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new_col.table
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self.result_column = old_col
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# set differences
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# leave out some stuff for later comp
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for key in (set(self.diff_keys) - set(('type',))):
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val = getattr(new_col, key, None)
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if getattr(self.result_column, key, None) != val:
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k.setdefault(key, val)
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# inspect types
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if not self.are_column_types_eq(self.result_column.type, new_col.type):
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k.setdefault('type', new_col.type)
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if len(p):
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k = self._extract_parameters(p, k, self.result_column)
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return k
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def apply_diffs(self, diffs):
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"""Populate dict and column object with new values"""
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self.diffs = diffs
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for key in self.diff_keys:
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|
if key in diffs:
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setattr(self.result_column, key, diffs[key])
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self.process_column(self.result_column)
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# create an instance of class type if not yet
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if 'type' in diffs and callable(self.result_column.type):
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self.result_column.type = self.result_column.type()
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# add column to the table
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if self.table is not None and self.alter_metadata:
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self.result_column.add_to_table(self.table)
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def are_column_types_eq(self, old_type, new_type):
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|
"""Compares two types to be equal"""
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|
ret = old_type.__class__ == new_type.__class__
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# String length is a special case
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|
if ret and isinstance(new_type, sqlalchemy.types.String):
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ret = (getattr(old_type, 'length', None) == \
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|
getattr(new_type, 'length', None))
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return ret
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|
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def _extract_parameters(self, p, k, column):
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|
"""Extracts data from p and modifies diffs"""
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p = list(p)
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|
while len(p):
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if isinstance(p[0], basestring):
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k.setdefault('name', p.pop(0))
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|
elif isinstance(p[0], sqlalchemy.types.AbstractType):
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k.setdefault('type', p.pop(0))
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elif callable(p[0]):
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p[0] = p[0]()
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else:
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break
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if len(p):
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new_col = column.copy_fixed()
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new_col._init_items(*p)
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k = self.compare_2_columns(column, new_col, **k)
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return k
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def process_column(self, column):
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|
"""Processes default values for column"""
|
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|
# XXX: this is a snippet from SA processing of positional parameters
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|
|
if not SQLA_06 and column.args:
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|
toinit = list(column.args)
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|
else:
|
|
|
toinit = list()
|
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|
|
if column.server_default is not None:
|
|
|
if isinstance(column.server_default, sqlalchemy.FetchedValue):
|
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|
toinit.append(column.server_default)
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|
else:
|
|
|
toinit.append(sqlalchemy.DefaultClause(column.server_default))
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|
|
if column.server_onupdate is not None:
|
|
|
if isinstance(column.server_onupdate, FetchedValue):
|
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|
toinit.append(column.server_default)
|
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|
else:
|
|
|
toinit.append(sqlalchemy.DefaultClause(column.server_onupdate,
|
|
|
for_update=True))
|
|
|
if toinit:
|
|
|
column._init_items(*toinit)
|
|
|
|
|
|
if not SQLA_06:
|
|
|
column.args = []
|
|
|
|
|
|
def _get_table(self):
|
|
|
return getattr(self, '_table', None)
|
|
|
|
|
|
def _set_table(self, table):
|
|
|
if isinstance(table, basestring):
|
|
|
if self.alter_metadata:
|
|
|
if not self.meta:
|
|
|
raise ValueError("metadata must be specified for table"
|
|
|
" reflection when using alter_metadata")
|
|
|
meta = self.meta
|
|
|
if self.engine:
|
|
|
meta.bind = self.engine
|
|
|
else:
|
|
|
if not self.engine and not self.meta:
|
|
|
raise ValueError("engine or metadata must be specified"
|
|
|
" to reflect tables")
|
|
|
if not self.engine:
|
|
|
self.engine = self.meta.bind
|
|
|
meta = sqlalchemy.MetaData(bind=self.engine)
|
|
|
self._table = sqlalchemy.Table(table, meta, autoload=True)
|
|
|
elif isinstance(table, sqlalchemy.Table):
|
|
|
self._table = table
|
|
|
if not self.alter_metadata:
|
|
|
self._table.meta = sqlalchemy.MetaData(bind=self._table.bind)
|
|
|
|
|
|
def _get_result_column(self):
|
|
|
return getattr(self, '_result_column', None)
|
|
|
|
|
|
def _set_result_column(self, column):
|
|
|
"""Set Column to Table based on alter_metadata evaluation."""
|
|
|
self.process_column(column)
|
|
|
if not hasattr(self, 'current_name'):
|
|
|
self.current_name = column.name
|
|
|
if self.alter_metadata:
|
|
|
self._result_column = column
|
|
|
else:
|
|
|
self._result_column = column.copy_fixed()
|
|
|
|
|
|
table = property(_get_table, _set_table)
|
|
|
result_column = property(_get_result_column, _set_result_column)
|
|
|
|
|
|
|
|
|
class ChangesetTable(object):
|
|
|
"""Changeset extensions to SQLAlchemy tables."""
|
|
|
|
|
|
def create_column(self, column, *p, **kw):
|
|
|
"""Creates a column.
|
|
|
|
|
|
The column parameter may be a column definition or the name of
|
|
|
a column in this table.
|
|
|
|
|
|
API to :meth:`ChangesetColumn.create`
|
|
|
|
|
|
:param column: Column to be created
|
|
|
:type column: Column instance or string
|
|
|
"""
|
|
|
if not isinstance(column, sqlalchemy.Column):
|
|
|
# It's a column name
|
|
|
column = getattr(self.c, str(column))
|
|
|
column.create(table=self, *p, **kw)
|
|
|
|
|
|
def drop_column(self, column, *p, **kw):
|
|
|
"""Drop a column, given its name or definition.
|
|
|
|
|
|
API to :meth:`ChangesetColumn.drop`
|
|
|
|
|
|
:param column: Column to be droped
|
|
|
:type column: Column instance or string
|
|
|
"""
|
|
|
if not isinstance(column, sqlalchemy.Column):
|
|
|
# It's a column name
|
|
|
try:
|
|
|
column = getattr(self.c, str(column))
|
|
|
except AttributeError:
|
|
|
# That column isn't part of the table. We don't need
|
|
|
# its entire definition to drop the column, just its
|
|
|
# name, so create a dummy column with the same name.
|
|
|
column = sqlalchemy.Column(str(column), sqlalchemy.Integer())
|
|
|
column.drop(table=self, *p, **kw)
|
|
|
|
|
|
def rename(self, name, connection=None, **kwargs):
|
|
|
"""Rename this table.
|
|
|
|
|
|
:param name: New name of the table.
|
|
|
:type name: string
|
|
|
:param alter_metadata: If True, table will be removed from metadata
|
|
|
:type alter_metadata: bool
|
|
|
:param connection: reuse connection istead of creating new one.
|
|
|
:type connection: :class:`sqlalchemy.engine.base.Connection` instance
|
|
|
"""
|
|
|
self.alter_metadata = kwargs.pop('alter_metadata', DEFAULT_ALTER_METADATA)
|
|
|
engine = self.bind
|
|
|
self.new_name = name
|
|
|
visitorcallable = get_engine_visitor(engine, 'schemachanger')
|
|
|
run_single_visitor(engine, visitorcallable, self, connection, **kwargs)
|
|
|
|
|
|
# Fix metadata registration
|
|
|
if self.alter_metadata:
|
|
|
self.name = name
|
|
|
self.deregister()
|
|
|
self._set_parent(self.metadata)
|
|
|
|
|
|
def _meta_key(self):
|
|
|
return sqlalchemy.schema._get_table_key(self.name, self.schema)
|
|
|
|
|
|
def deregister(self):
|
|
|
"""Remove this table from its metadata"""
|
|
|
key = self._meta_key()
|
|
|
meta = self.metadata
|
|
|
if key in meta.tables:
|
|
|
del meta.tables[key]
|
|
|
|
|
|
|
|
|
class ChangesetColumn(object):
|
|
|
"""Changeset extensions to SQLAlchemy columns."""
|
|
|
|
|
|
def alter(self, *p, **k):
|
|
|
"""Makes a call to :func:`alter_column` for the column this
|
|
|
method is called on.
|
|
|
"""
|
|
|
if 'table' not in k:
|
|
|
k['table'] = self.table
|
|
|
if 'engine' not in k:
|
|
|
k['engine'] = k['table'].bind
|
|
|
return alter_column(self, *p, **k)
|
|
|
|
|
|
def create(self, table=None, index_name=None, unique_name=None,
|
|
|
primary_key_name=None, populate_default=True, connection=None, **kwargs):
|
|
|
"""Create this column in the database.
|
|
|
|
|
|
Assumes the given table exists. ``ALTER TABLE ADD COLUMN``,
|
|
|
for most databases.
|
|
|
|
|
|
:param table: Table instance to create on.
|
|
|
:param index_name: Creates :class:`ChangesetIndex` on this column.
|
|
|
:param unique_name: Creates :class:\
|
|
|
`~migrate.changeset.constraint.UniqueConstraint` on this column.
|
|
|
:param primary_key_name: Creates :class:\
|
|
|
`~migrate.changeset.constraint.PrimaryKeyConstraint` on this column.
|
|
|
:param alter_metadata: If True, column will be added to table object.
|
|
|
:param populate_default: If True, created column will be \
|
|
|
populated with defaults
|
|
|
:param connection: reuse connection istead of creating new one.
|
|
|
:type table: Table instance
|
|
|
:type index_name: string
|
|
|
:type unique_name: string
|
|
|
:type primary_key_name: string
|
|
|
:type alter_metadata: bool
|
|
|
:type populate_default: bool
|
|
|
:type connection: :class:`sqlalchemy.engine.base.Connection` instance
|
|
|
|
|
|
:returns: self
|
|
|
"""
|
|
|
self.populate_default = populate_default
|
|
|
self.alter_metadata = kwargs.pop('alter_metadata', DEFAULT_ALTER_METADATA)
|
|
|
self.index_name = index_name
|
|
|
self.unique_name = unique_name
|
|
|
self.primary_key_name = primary_key_name
|
|
|
for cons in ('index_name', 'unique_name', 'primary_key_name'):
|
|
|
self._check_sanity_constraints(cons)
|
|
|
|
|
|
if self.alter_metadata:
|
|
|
self.add_to_table(table)
|
|
|
engine = self.table.bind
|
|
|
visitorcallable = get_engine_visitor(engine, 'columngenerator')
|
|
|
engine._run_visitor(visitorcallable, self, connection, **kwargs)
|
|
|
|
|
|
# TODO: reuse existing connection
|
|
|
if self.populate_default and self.default is not None:
|
|
|
stmt = table.update().values({self: engine._execute_default(self.default)})
|
|
|
engine.execute(stmt)
|
|
|
|
|
|
return self
|
|
|
|
|
|
def drop(self, table=None, connection=None, **kwargs):
|
|
|
"""Drop this column from the database, leaving its table intact.
|
|
|
|
|
|
``ALTER TABLE DROP COLUMN``, for most databases.
|
|
|
|
|
|
:param alter_metadata: If True, column will be removed from table object.
|
|
|
:type alter_metadata: bool
|
|
|
:param connection: reuse connection istead of creating new one.
|
|
|
:type connection: :class:`sqlalchemy.engine.base.Connection` instance
|
|
|
"""
|
|
|
self.alter_metadata = kwargs.pop('alter_metadata', DEFAULT_ALTER_METADATA)
|
|
|
if table is not None:
|
|
|
self.table = table
|
|
|
engine = self.table.bind
|
|
|
if self.alter_metadata:
|
|
|
self.remove_from_table(self.table, unset_table=False)
|
|
|
visitorcallable = get_engine_visitor(engine, 'columndropper')
|
|
|
engine._run_visitor(visitorcallable, self, connection, **kwargs)
|
|
|
if self.alter_metadata:
|
|
|
self.table = None
|
|
|
return self
|
|
|
|
|
|
def add_to_table(self, table):
|
|
|
if table is not None and self.table is None:
|
|
|
self._set_parent(table)
|
|
|
|
|
|
def _col_name_in_constraint(self, cons, name):
|
|
|
return False
|
|
|
|
|
|
def remove_from_table(self, table, unset_table=True):
|
|
|
# TODO: remove primary keys, constraints, etc
|
|
|
if unset_table:
|
|
|
self.table = None
|
|
|
|
|
|
to_drop = set()
|
|
|
for index in table.indexes:
|
|
|
columns = []
|
|
|
for col in index.columns:
|
|
|
if col.name != self.name:
|
|
|
columns.append(col)
|
|
|
if columns:
|
|
|
index.columns = columns
|
|
|
else:
|
|
|
to_drop.add(index)
|
|
|
table.indexes = table.indexes - to_drop
|
|
|
|
|
|
to_drop = set()
|
|
|
for cons in table.constraints:
|
|
|
# TODO: deal with other types of constraint
|
|
|
if isinstance(cons, (ForeignKeyConstraint,
|
|
|
UniqueConstraint)):
|
|
|
for col_name in cons.columns:
|
|
|
if not isinstance(col_name, basestring):
|
|
|
col_name = col_name.name
|
|
|
if self.name == col_name:
|
|
|
to_drop.add(cons)
|
|
|
table.constraints = table.constraints - to_drop
|
|
|
|
|
|
if table.c.contains_column(self):
|
|
|
table.c.remove(self)
|
|
|
|
|
|
# TODO: this is fixed in 0.6
|
|
|
def copy_fixed(self, **kw):
|
|
|
"""Create a copy of this ``Column``, with all attributes."""
|
|
|
return sqlalchemy.Column(self.name, self.type, self.default,
|
|
|
key=self.key,
|
|
|
primary_key=self.primary_key,
|
|
|
nullable=self.nullable,
|
|
|
quote=self.quote,
|
|
|
index=self.index,
|
|
|
unique=self.unique,
|
|
|
onupdate=self.onupdate,
|
|
|
autoincrement=self.autoincrement,
|
|
|
server_default=self.server_default,
|
|
|
server_onupdate=self.server_onupdate,
|
|
|
*[c.copy(**kw) for c in self.constraints])
|
|
|
|
|
|
def _check_sanity_constraints(self, name):
|
|
|
"""Check if constraints names are correct"""
|
|
|
obj = getattr(self, name)
|
|
|
if (getattr(self, name[:-5]) and not obj):
|
|
|
raise InvalidConstraintError("Column.create() accepts index_name,"
|
|
|
" primary_key_name and unique_name to generate constraints")
|
|
|
if not isinstance(obj, basestring) and obj is not None:
|
|
|
raise InvalidConstraintError(
|
|
|
"%s argument for column must be constraint name" % name)
|
|
|
|
|
|
|
|
|
class ChangesetIndex(object):
|
|
|
"""Changeset extensions to SQLAlchemy Indexes."""
|
|
|
|
|
|
__visit_name__ = 'index'
|
|
|
|
|
|
def rename(self, name, connection=None, **kwargs):
|
|
|
"""Change the name of an index.
|
|
|
|
|
|
:param name: New name of the Index.
|
|
|
:type name: string
|
|
|
:param alter_metadata: If True, Index object will be altered.
|
|
|
:type alter_metadata: bool
|
|
|
:param connection: reuse connection istead of creating new one.
|
|
|
:type connection: :class:`sqlalchemy.engine.base.Connection` instance
|
|
|
"""
|
|
|
self.alter_metadata = kwargs.pop('alter_metadata', DEFAULT_ALTER_METADATA)
|
|
|
engine = self.table.bind
|
|
|
self.new_name = name
|
|
|
visitorcallable = get_engine_visitor(engine, 'schemachanger')
|
|
|
engine._run_visitor(visitorcallable, self, connection, **kwargs)
|
|
|
if self.alter_metadata:
|
|
|
self.name = name
|
|
|
|
|
|
|
|
|
class ChangesetDefaultClause(object):
|
|
|
"""Implements comparison between :class:`DefaultClause` instances"""
|
|
|
|
|
|
def __eq__(self, other):
|
|
|
if isinstance(other, self.__class__):
|
|
|
if self.arg == other.arg:
|
|
|
return True
|
|
|
|
|
|
def __ne__(self, other):
|
|
|
return not self.__eq__(other)
|
|
|
|
