diff options
Diffstat (limited to 'lib/python2.7/site-packages/sqlalchemy_migrate-0.7.2-py2.7.egg/migrate/changeset/constraint.py')
| -rwxr-xr-x | lib/python2.7/site-packages/sqlalchemy_migrate-0.7.2-py2.7.egg/migrate/changeset/constraint.py | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/lib/python2.7/site-packages/sqlalchemy_migrate-0.7.2-py2.7.egg/migrate/changeset/constraint.py b/lib/python2.7/site-packages/sqlalchemy_migrate-0.7.2-py2.7.egg/migrate/changeset/constraint.py deleted file mode 100755 index 96407bd7..00000000 --- a/lib/python2.7/site-packages/sqlalchemy_migrate-0.7.2-py2.7.egg/migrate/changeset/constraint.py +++ /dev/null @@ -1,199 +0,0 @@ -""" - This module defines standalone schema constraint classes. -""" -from sqlalchemy import schema - -from migrate.exceptions import * - -class ConstraintChangeset(object): - """Base class for Constraint classes.""" - - def _normalize_columns(self, cols, table_name=False): - """Given: column objects or names; return col names and - (maybe) a table""" - colnames = [] - table = None - for col in cols: - if isinstance(col, schema.Column): - if col.table is not None and table is None: - table = col.table - if table_name: - col = '.'.join((col.table.name, col.name)) - else: - col = col.name - colnames.append(col) - return colnames, table - - def __do_imports(self, visitor_name, *a, **kw): - engine = kw.pop('engine', self.table.bind) - from migrate.changeset.databases.visitor import (get_engine_visitor, - run_single_visitor) - visitorcallable = get_engine_visitor(engine, visitor_name) - run_single_visitor(engine, visitorcallable, self, *a, **kw) - - def create(self, *a, **kw): - """Create the constraint in the database. - - :param engine: the database engine to use. If this is \ - :keyword:`None` the instance's engine will be used - :type engine: :class:`sqlalchemy.engine.base.Engine` - :param connection: reuse connection istead of creating new one. - :type connection: :class:`sqlalchemy.engine.base.Connection` instance - """ - # TODO: set the parent here instead of in __init__ - self.__do_imports('constraintgenerator', *a, **kw) - - def drop(self, *a, **kw): - """Drop the constraint from the database. - - :param engine: the database engine to use. If this is - :keyword:`None` the instance's engine will be used - :param cascade: Issue CASCADE drop if database supports it - :type engine: :class:`sqlalchemy.engine.base.Engine` - :type cascade: bool - :param connection: reuse connection istead of creating new one. - :type connection: :class:`sqlalchemy.engine.base.Connection` instance - :returns: Instance with cleared columns - """ - self.cascade = kw.pop('cascade', False) - self.__do_imports('constraintdropper', *a, **kw) - # the spirit of Constraint objects is that they - # are immutable (just like in a DB. they're only ADDed - # or DROPped). - #self.columns.clear() - return self - - -class PrimaryKeyConstraint(ConstraintChangeset, schema.PrimaryKeyConstraint): - """Construct PrimaryKeyConstraint - - Migrate's additional parameters: - - :param cols: Columns in constraint. - :param table: If columns are passed as strings, this kw is required - :type table: Table instance - :type cols: strings or Column instances - """ - - __migrate_visit_name__ = 'migrate_primary_key_constraint' - - def __init__(self, *cols, **kwargs): - colnames, table = self._normalize_columns(cols) - table = kwargs.pop('table', table) - super(PrimaryKeyConstraint, self).__init__(*colnames, **kwargs) - if table is not None: - self._set_parent(table) - - - def autoname(self): - """Mimic the database's automatic constraint names""" - return "%s_pkey" % self.table.name - - -class ForeignKeyConstraint(ConstraintChangeset, schema.ForeignKeyConstraint): - """Construct ForeignKeyConstraint - - Migrate's additional parameters: - - :param columns: Columns in constraint - :param refcolumns: Columns that this FK reffers to in another table. - :param table: If columns are passed as strings, this kw is required - :type table: Table instance - :type columns: list of strings or Column instances - :type refcolumns: list of strings or Column instances - """ - - __migrate_visit_name__ = 'migrate_foreign_key_constraint' - - def __init__(self, columns, refcolumns, *args, **kwargs): - colnames, table = self._normalize_columns(columns) - table = kwargs.pop('table', table) - refcolnames, reftable = self._normalize_columns(refcolumns, - table_name=True) - super(ForeignKeyConstraint, self).__init__(colnames, refcolnames, *args, - **kwargs) - if table is not None: - self._set_parent(table) - - @property - def referenced(self): - return [e.column for e in self.elements] - - @property - def reftable(self): - return self.referenced[0].table - - def autoname(self): - """Mimic the database's automatic constraint names""" - if hasattr(self.columns, 'keys'): - # SA <= 0.5 - firstcol = self.columns[self.columns.keys()[0]] - ret = "%(table)s_%(firstcolumn)s_fkey" % dict( - table=firstcol.table.name, - firstcolumn=firstcol.name,) - else: - # SA >= 0.6 - ret = "%(table)s_%(firstcolumn)s_fkey" % dict( - table=self.table.name, - firstcolumn=self.columns[0],) - return ret - - -class CheckConstraint(ConstraintChangeset, schema.CheckConstraint): - """Construct CheckConstraint - - Migrate's additional parameters: - - :param sqltext: Plain SQL text to check condition - :param columns: If not name is applied, you must supply this kw\ - to autoname constraint - :param table: If columns are passed as strings, this kw is required - :type table: Table instance - :type columns: list of Columns instances - :type sqltext: string - """ - - __migrate_visit_name__ = 'migrate_check_constraint' - - def __init__(self, sqltext, *args, **kwargs): - cols = kwargs.pop('columns', []) - if not cols and not kwargs.get('name', False): - raise InvalidConstraintError('You must either set "name"' - 'parameter or "columns" to autogenarate it.') - colnames, table = self._normalize_columns(cols) - table = kwargs.pop('table', table) - schema.CheckConstraint.__init__(self, sqltext, *args, **kwargs) - if table is not None: - self._set_parent(table) - self.colnames = colnames - - def autoname(self): - return "%(table)s_%(cols)s_check" % \ - dict(table=self.table.name, cols="_".join(self.colnames)) - - -class UniqueConstraint(ConstraintChangeset, schema.UniqueConstraint): - """Construct UniqueConstraint - - Migrate's additional parameters: - - :param cols: Columns in constraint. - :param table: If columns are passed as strings, this kw is required - :type table: Table instance - :type cols: strings or Column instances - - .. versionadded:: 0.6.0 - """ - - __migrate_visit_name__ = 'migrate_unique_constraint' - - def __init__(self, *cols, **kwargs): - self.colnames, table = self._normalize_columns(cols) - table = kwargs.pop('table', table) - super(UniqueConstraint, self).__init__(*self.colnames, **kwargs) - if table is not None: - self._set_parent(table) - - def autoname(self): - """Mimic the database's automatic constraint names""" - return "%s_%s_key" % (self.table.name, self.colnames[0]) |