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.venv/Lib/site-packages/sqlalchemy/sql/schema.py

@@ -68,6 +68,7 @@ from .base import DedupeColumnCollection
 from .base import DialectKWArgs
 from .base import Executable
 from .base import SchemaEventTarget as SchemaEventTarget
+from .base import SchemaVisitable as SchemaVisitable
 from .coercions import _document_text_coercion
 from .elements import ClauseElement
 from .elements import ColumnClause
@@ -91,6 +92,7 @@ from ..util.typing import TypeGuard
 
 if typing.TYPE_CHECKING:
     from ._typing import _AutoIncrementType
+    from ._typing import _CreateDropBind
     from ._typing import _DDLColumnArgument
     from ._typing import _InfoType
     from ._typing import _TextCoercedExpressionArgument
@@ -108,7 +110,6 @@ if typing.TYPE_CHECKING:
     from ..engine.interfaces import _CoreMultiExecuteParams
     from ..engine.interfaces import CoreExecuteOptionsParameter
     from ..engine.interfaces import ExecutionContext
-    from ..engine.mock import MockConnection
     from ..engine.reflection import _ReflectionInfo
     from ..sql.selectable import FromClause
 
@@ -117,8 +118,6 @@ _SI = TypeVar("_SI", bound="SchemaItem")
 _TAB = TypeVar("_TAB", bound="Table")
 
 
-_CreateDropBind = Union["Engine", "Connection", "MockConnection"]
-
 _ConstraintNameArgument = Optional[Union[str, _NoneName]]
 
 _ServerDefaultArgument = Union[
@@ -212,7 +211,7 @@ def _copy_expression(
 
 
 @inspection._self_inspects
-class SchemaItem(SchemaEventTarget, visitors.Visitable):
+class SchemaItem(SchemaVisitable):
     """Base class for items that define a database schema."""
 
     __visit_name__ = "schema_item"
@@ -477,7 +476,7 @@ class Table(
             table.dispatch.before_parent_attach(table, metadata)
             metadata._add_table(name, schema, table)
             try:
-                table.__init__(name, metadata, *args, _no_init=False, **kw)
+                table.__init__(name, metadata, *args, _no_init=False, **kw)  # type: ignore[misc] # noqa: E501
                 table.dispatch.after_parent_attach(table, metadata)
                 return table
             except Exception:
@@ -2243,7 +2242,7 @@ class Column(DialectKWArgs, SchemaItem, ColumnClause[_T]):
         return _DefaultDescriptionTuple._from_column_default(self.onupdate)
 
     @util.memoized_property
-    def _gen_static_annotations_cache_key(self) -> bool:  # type: ignore
+    def _gen_static_annotations_cache_key(self) -> bool:
         """special attribute used by cache key gen, if true, we will
         use a static cache key for the annotations dictionary, else we
         will generate a new cache key for annotations each time.
@@ -2837,9 +2836,18 @@ class ForeignKey(DialectKWArgs, SchemaItem):
             issuing DDL for this constraint. Typical values include CASCADE,
             DELETE and RESTRICT.
 
+            .. seealso::
+
+                :ref:`on_update_on_delete`
+
         :param ondelete: Optional string. If set, emit ON DELETE <value> when
             issuing DDL for this constraint. Typical values include CASCADE,
-            DELETE and RESTRICT.
+            SET NULL and RESTRICT.  Some dialects may allow for additional
+            syntaxes.
+
+            .. seealso::
+
+                :ref:`on_update_on_delete`
 
         :param deferrable: Optional bool. If set, emit DEFERRABLE or NOT
             DEFERRABLE when issuing DDL for this constraint.
@@ -4623,12 +4631,21 @@ class ForeignKeyConstraint(ColumnCollectionConstraint):
         :param name: Optional, the in-database name of the key.
 
         :param onupdate: Optional string. If set, emit ON UPDATE <value> when
-          issuing DDL for this constraint. Typical values include CASCADE,
-          DELETE and RESTRICT.
+            issuing DDL for this constraint. Typical values include CASCADE,
+            DELETE and RESTRICT.
+
+            .. seealso::
+
+                :ref:`on_update_on_delete`
 
         :param ondelete: Optional string. If set, emit ON DELETE <value> when
-          issuing DDL for this constraint. Typical values include CASCADE,
-          DELETE and RESTRICT.
+            issuing DDL for this constraint. Typical values include CASCADE,
+            SET NULL and RESTRICT.  Some dialects may allow for additional
+            syntaxes.
+
+            .. seealso::
+
+                :ref:`on_update_on_delete`
 
         :param deferrable: Optional bool. If set, emit DEFERRABLE or NOT
           DEFERRABLE when issuing DDL for this constraint.
@@ -5602,7 +5619,7 @@ class MetaData(HasSchemaAttr):
     def clear(self) -> None:
         """Clear all Table objects from this MetaData."""
 
-        dict.clear(self.tables)  # type: ignore
+        dict.clear(self.tables)
         self._schemas.clear()
         self._fk_memos.clear()