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464 lines
16 KiB
464 lines
16 KiB
from __future__ import annotations
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import re
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from typing import Any
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from typing import Optional
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from typing import TYPE_CHECKING
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from typing import Union
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from sqlalchemy import schema
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from sqlalchemy import types as sqltypes
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from sqlalchemy.ext.compiler import compiles
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from .base import alter_table
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from .base import AlterColumn
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from .base import ColumnDefault
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from .base import ColumnName
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from .base import ColumnNullable
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from .base import ColumnType
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from .base import format_column_name
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from .base import format_server_default
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from .impl import DefaultImpl
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from .. import util
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from ..autogenerate import compare
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from ..util import sqla_compat
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from ..util.sqla_compat import _is_mariadb
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from ..util.sqla_compat import _is_type_bound
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if TYPE_CHECKING:
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from typing import Literal
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from sqlalchemy.dialects.mysql.base import MySQLDDLCompiler
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from sqlalchemy.sql.ddl import DropConstraint
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from sqlalchemy.sql.schema import Constraint
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from sqlalchemy.sql.type_api import TypeEngine
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from .base import _ServerDefault
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class MySQLImpl(DefaultImpl):
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__dialect__ = "mysql"
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transactional_ddl = False
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type_synonyms = DefaultImpl.type_synonyms + (
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{"BOOL", "TINYINT"},
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{"JSON", "LONGTEXT"},
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)
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type_arg_extract = [r"character set ([\w\-_]+)", r"collate ([\w\-_]+)"]
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def alter_column( # type:ignore[override]
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self,
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table_name: str,
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column_name: str,
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nullable: Optional[bool] = None,
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server_default: Union[_ServerDefault, Literal[False]] = False,
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name: Optional[str] = None,
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type_: Optional[TypeEngine] = None,
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schema: Optional[str] = None,
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existing_type: Optional[TypeEngine] = None,
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existing_server_default: Optional[_ServerDefault] = None,
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existing_nullable: Optional[bool] = None,
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autoincrement: Optional[bool] = None,
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existing_autoincrement: Optional[bool] = None,
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comment: Optional[Union[str, Literal[False]]] = False,
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existing_comment: Optional[str] = None,
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**kw: Any,
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) -> None:
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if sqla_compat._server_default_is_identity(
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server_default, existing_server_default
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) or sqla_compat._server_default_is_computed(
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server_default, existing_server_default
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):
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# modifying computed or identity columns is not supported
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# the default will raise
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super().alter_column(
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table_name,
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column_name,
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nullable=nullable,
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type_=type_,
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schema=schema,
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existing_type=existing_type,
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existing_nullable=existing_nullable,
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server_default=server_default,
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existing_server_default=existing_server_default,
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**kw,
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)
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if name is not None or self._is_mysql_allowed_functional_default(
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type_ if type_ is not None else existing_type, server_default
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):
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self._exec(
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MySQLChangeColumn(
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table_name,
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column_name,
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schema=schema,
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newname=name if name is not None else column_name,
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nullable=nullable
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if nullable is not None
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else existing_nullable
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if existing_nullable is not None
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else True,
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type_=type_ if type_ is not None else existing_type,
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default=server_default
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if server_default is not False
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else existing_server_default,
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autoincrement=autoincrement
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if autoincrement is not None
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else existing_autoincrement,
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comment=comment
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if comment is not False
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else existing_comment,
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)
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)
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elif (
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nullable is not None
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or type_ is not None
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or autoincrement is not None
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or comment is not False
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):
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self._exec(
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MySQLModifyColumn(
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table_name,
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column_name,
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schema=schema,
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newname=name if name is not None else column_name,
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nullable=nullable
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if nullable is not None
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else existing_nullable
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if existing_nullable is not None
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else True,
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type_=type_ if type_ is not None else existing_type,
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default=server_default
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if server_default is not False
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else existing_server_default,
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autoincrement=autoincrement
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if autoincrement is not None
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else existing_autoincrement,
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comment=comment
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if comment is not False
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else existing_comment,
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)
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)
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elif server_default is not False:
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self._exec(
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MySQLAlterDefault(
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table_name, column_name, server_default, schema=schema
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)
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)
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def drop_constraint(
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self,
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const: Constraint,
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) -> None:
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if isinstance(const, schema.CheckConstraint) and _is_type_bound(const):
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return
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super().drop_constraint(const)
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def _is_mysql_allowed_functional_default(
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self,
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type_: Optional[TypeEngine],
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server_default: Union[_ServerDefault, Literal[False]],
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) -> bool:
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return (
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type_ is not None
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and type_._type_affinity # type:ignore[attr-defined]
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is sqltypes.DateTime
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and server_default is not None
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)
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def compare_server_default(
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self,
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inspector_column,
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metadata_column,
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rendered_metadata_default,
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rendered_inspector_default,
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):
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# partially a workaround for SQLAlchemy issue #3023; if the
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# column were created without "NOT NULL", MySQL may have added
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# an implicit default of '0' which we need to skip
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# TODO: this is not really covered anymore ?
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if (
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metadata_column.type._type_affinity is sqltypes.Integer
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and inspector_column.primary_key
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and not inspector_column.autoincrement
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and not rendered_metadata_default
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and rendered_inspector_default == "'0'"
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):
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return False
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elif inspector_column.type._type_affinity is sqltypes.Integer:
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rendered_inspector_default = (
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re.sub(r"^'|'$", "", rendered_inspector_default)
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if rendered_inspector_default is not None
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else None
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)
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return rendered_inspector_default != rendered_metadata_default
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elif rendered_inspector_default and rendered_metadata_default:
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# adjust for "function()" vs. "FUNCTION" as can occur particularly
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# for the CURRENT_TIMESTAMP function on newer MariaDB versions
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# SQLAlchemy MySQL dialect bundles ON UPDATE into the server
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# default; adjust for this possibly being present.
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onupdate_ins = re.match(
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r"(.*) (on update.*?)(?:\(\))?$",
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rendered_inspector_default.lower(),
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)
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onupdate_met = re.match(
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r"(.*) (on update.*?)(?:\(\))?$",
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rendered_metadata_default.lower(),
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)
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if onupdate_ins:
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if not onupdate_met:
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return True
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elif onupdate_ins.group(2) != onupdate_met.group(2):
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return True
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rendered_inspector_default = onupdate_ins.group(1)
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rendered_metadata_default = onupdate_met.group(1)
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return re.sub(
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r"(.*?)(?:\(\))?$", r"\1", rendered_inspector_default.lower()
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) != re.sub(
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r"(.*?)(?:\(\))?$", r"\1", rendered_metadata_default.lower()
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)
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else:
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return rendered_inspector_default != rendered_metadata_default
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def correct_for_autogen_constraints(
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self,
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conn_unique_constraints,
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conn_indexes,
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metadata_unique_constraints,
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metadata_indexes,
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):
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# TODO: if SQLA 1.0, make use of "duplicates_index"
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# metadata
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removed = set()
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for idx in list(conn_indexes):
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if idx.unique:
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continue
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# MySQL puts implicit indexes on FK columns, even if
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# composite and even if MyISAM, so can't check this too easily.
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# the name of the index may be the column name or it may
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# be the name of the FK constraint.
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for col in idx.columns:
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if idx.name == col.name:
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conn_indexes.remove(idx)
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removed.add(idx.name)
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break
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for fk in col.foreign_keys:
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if fk.name == idx.name:
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conn_indexes.remove(idx)
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removed.add(idx.name)
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break
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if idx.name in removed:
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break
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# then remove indexes from the "metadata_indexes"
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# that we've removed from reflected, otherwise they come out
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# as adds (see #202)
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for idx in list(metadata_indexes):
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if idx.name in removed:
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metadata_indexes.remove(idx)
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def correct_for_autogen_foreignkeys(self, conn_fks, metadata_fks):
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conn_fk_by_sig = {
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compare._fk_constraint_sig(fk).sig: fk for fk in conn_fks
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}
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metadata_fk_by_sig = {
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compare._fk_constraint_sig(fk).sig: fk for fk in metadata_fks
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}
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for sig in set(conn_fk_by_sig).intersection(metadata_fk_by_sig):
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mdfk = metadata_fk_by_sig[sig]
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cnfk = conn_fk_by_sig[sig]
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# MySQL considers RESTRICT to be the default and doesn't
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# report on it. if the model has explicit RESTRICT and
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# the conn FK has None, set it to RESTRICT
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if (
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mdfk.ondelete is not None
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and mdfk.ondelete.lower() == "restrict"
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and cnfk.ondelete is None
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):
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cnfk.ondelete = "RESTRICT"
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if (
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mdfk.onupdate is not None
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and mdfk.onupdate.lower() == "restrict"
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and cnfk.onupdate is None
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):
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cnfk.onupdate = "RESTRICT"
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class MariaDBImpl(MySQLImpl):
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__dialect__ = "mariadb"
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class MySQLAlterDefault(AlterColumn):
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def __init__(
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self,
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name: str,
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column_name: str,
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default: _ServerDefault,
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schema: Optional[str] = None,
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) -> None:
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super(AlterColumn, self).__init__(name, schema=schema)
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self.column_name = column_name
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self.default = default
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class MySQLChangeColumn(AlterColumn):
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def __init__(
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self,
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name: str,
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column_name: str,
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schema: Optional[str] = None,
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newname: Optional[str] = None,
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type_: Optional[TypeEngine] = None,
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nullable: Optional[bool] = None,
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default: Optional[Union[_ServerDefault, Literal[False]]] = False,
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autoincrement: Optional[bool] = None,
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comment: Optional[Union[str, Literal[False]]] = False,
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) -> None:
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super(AlterColumn, self).__init__(name, schema=schema)
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self.column_name = column_name
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self.nullable = nullable
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self.newname = newname
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self.default = default
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self.autoincrement = autoincrement
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self.comment = comment
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if type_ is None:
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raise util.CommandError(
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"All MySQL CHANGE/MODIFY COLUMN operations "
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"require the existing type."
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)
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self.type_ = sqltypes.to_instance(type_)
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class MySQLModifyColumn(MySQLChangeColumn):
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pass
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@compiles(ColumnNullable, "mysql", "mariadb")
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@compiles(ColumnName, "mysql", "mariadb")
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@compiles(ColumnDefault, "mysql", "mariadb")
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@compiles(ColumnType, "mysql", "mariadb")
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def _mysql_doesnt_support_individual(element, compiler, **kw):
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raise NotImplementedError(
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"Individual alter column constructs not supported by MySQL"
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)
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@compiles(MySQLAlterDefault, "mysql", "mariadb")
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def _mysql_alter_default(
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element: MySQLAlterDefault, compiler: MySQLDDLCompiler, **kw
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) -> str:
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return "%s ALTER COLUMN %s %s" % (
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alter_table(compiler, element.table_name, element.schema),
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format_column_name(compiler, element.column_name),
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"SET DEFAULT %s" % format_server_default(compiler, element.default)
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if element.default is not None
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else "DROP DEFAULT",
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)
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@compiles(MySQLModifyColumn, "mysql", "mariadb")
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def _mysql_modify_column(
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element: MySQLModifyColumn, compiler: MySQLDDLCompiler, **kw
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) -> str:
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return "%s MODIFY %s %s" % (
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alter_table(compiler, element.table_name, element.schema),
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format_column_name(compiler, element.column_name),
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_mysql_colspec(
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compiler,
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nullable=element.nullable,
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server_default=element.default,
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type_=element.type_,
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autoincrement=element.autoincrement,
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comment=element.comment,
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),
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)
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@compiles(MySQLChangeColumn, "mysql", "mariadb")
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def _mysql_change_column(
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element: MySQLChangeColumn, compiler: MySQLDDLCompiler, **kw
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) -> str:
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return "%s CHANGE %s %s %s" % (
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alter_table(compiler, element.table_name, element.schema),
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format_column_name(compiler, element.column_name),
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format_column_name(compiler, element.newname),
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_mysql_colspec(
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compiler,
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nullable=element.nullable,
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server_default=element.default,
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type_=element.type_,
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autoincrement=element.autoincrement,
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comment=element.comment,
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),
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)
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def _mysql_colspec(
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compiler: MySQLDDLCompiler,
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nullable: Optional[bool],
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server_default: Optional[Union[_ServerDefault, Literal[False]]],
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type_: TypeEngine,
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autoincrement: Optional[bool],
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comment: Optional[Union[str, Literal[False]]],
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) -> str:
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spec = "%s %s" % (
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compiler.dialect.type_compiler.process(type_),
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"NULL" if nullable else "NOT NULL",
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)
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if autoincrement:
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spec += " AUTO_INCREMENT"
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if server_default is not False and server_default is not None:
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spec += " DEFAULT %s" % format_server_default(compiler, server_default)
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if comment:
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spec += " COMMENT %s" % compiler.sql_compiler.render_literal_value(
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comment, sqltypes.String()
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)
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return spec
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@compiles(schema.DropConstraint, "mysql", "mariadb")
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def _mysql_drop_constraint(
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element: DropConstraint, compiler: MySQLDDLCompiler, **kw
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) -> str:
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"""Redefine SQLAlchemy's drop constraint to
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raise errors for invalid constraint type."""
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constraint = element.element
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if isinstance(
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constraint,
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(
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schema.ForeignKeyConstraint,
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schema.PrimaryKeyConstraint,
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schema.UniqueConstraint,
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),
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):
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assert not kw
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return compiler.visit_drop_constraint(element)
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elif isinstance(constraint, schema.CheckConstraint):
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# note that SQLAlchemy as of 1.2 does not yet support
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# DROP CONSTRAINT for MySQL/MariaDB, so we implement fully
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# here.
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if _is_mariadb(compiler.dialect):
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return "ALTER TABLE %s DROP CONSTRAINT %s" % (
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compiler.preparer.format_table(constraint.table),
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compiler.preparer.format_constraint(constraint),
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)
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else:
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return "ALTER TABLE %s DROP CHECK %s" % (
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compiler.preparer.format_table(constraint.table),
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compiler.preparer.format_constraint(constraint),
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)
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else:
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raise NotImplementedError(
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"No generic 'DROP CONSTRAINT' in MySQL - "
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"please specify constraint type"
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)
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