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96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
9 years ago
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from . import exclusions
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from .. import schema, event
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from . import config
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__all__ = 'Table', 'Column',
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table_options = {}
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def Table(*args, **kw):
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"""A schema.Table wrapper/hook for dialect-specific tweaks."""
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test_opts = dict([(k, kw.pop(k)) for k in kw.keys()
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if k.startswith('test_')])
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kw.update(table_options)
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if exclusions.against('mysql'):
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if 'mysql_engine' not in kw and 'mysql_type' not in kw:
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if 'test_needs_fk' in test_opts or 'test_needs_acid' in test_opts:
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kw['mysql_engine'] = 'InnoDB'
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else:
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kw['mysql_engine'] = 'MyISAM'
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# Apply some default cascading rules for self-referential foreign keys.
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# MySQL InnoDB has some issues around seleting self-refs too.
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if exclusions.against('firebird'):
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table_name = args[0]
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unpack = (config.db.dialect.
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identifier_preparer.unformat_identifiers)
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# Only going after ForeignKeys in Columns. May need to
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# expand to ForeignKeyConstraint too.
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fks = [fk
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for col in args if isinstance(col, schema.Column)
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for fk in col.foreign_keys]
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for fk in fks:
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# root around in raw spec
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ref = fk._colspec
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if isinstance(ref, schema.Column):
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name = ref.table.name
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else:
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# take just the table name: on FB there cannot be
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# a schema, so the first element is always the
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# table name, possibly followed by the field name
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name = unpack(ref)[0]
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if name == table_name:
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if fk.ondelete is None:
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fk.ondelete = 'CASCADE'
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if fk.onupdate is None:
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fk.onupdate = 'CASCADE'
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return schema.Table(*args, **kw)
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def Column(*args, **kw):
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"""A schema.Column wrapper/hook for dialect-specific tweaks."""
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test_opts = dict([(k, kw.pop(k)) for k in kw.keys()
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if k.startswith('test_')])
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if not config.requirements.foreign_key_ddl.enabled:
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args = [arg for arg in args if not isinstance(arg, schema.ForeignKey)]
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col = schema.Column(*args, **kw)
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if 'test_needs_autoincrement' in test_opts and \
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kw.get('primary_key', False):
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# allow any test suite to pick up on this
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col.info['test_needs_autoincrement'] = True
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# hardcoded rule for firebird, oracle; this should
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# be moved out
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if exclusions.against('firebird', 'oracle'):
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def add_seq(c, tbl):
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c._init_items(
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schema.Sequence(_truncate_name(
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config.db.dialect, tbl.name + '_' + c.name + '_seq'),
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optional=True)
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)
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event.listen(col, 'after_parent_attach', add_seq, propagate=True)
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return col
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def _truncate_name(dialect, name):
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if len(name) > dialect.max_identifier_length:
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return name[0:max(dialect.max_identifier_length - 6, 0)] + \
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"_" + hex(hash(name) % 64)[2:]
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else:
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return name
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