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sqltypes.py
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59 lines (47 loc) · 1.92 KB
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import uuid
from typing import Any, Optional, cast
from sqlalchemy import CHAR, types
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.engine.interfaces import Dialect
from sqlalchemy.sql.type_api import TypeEngine
class AutoString(types.TypeDecorator): # type: ignore
impl = types.String
cache_ok = True
mysql_default_length = 255
def load_dialect_impl(self, dialect: Dialect) -> "types.TypeEngine[Any]":
impl = cast(types.String, self.impl)
if impl.length is None and dialect.name == "mysql":
return dialect.type_descriptor(types.String(self.mysql_default_length))
return super().load_dialect_impl(dialect)
# Reference form SQLAlchemy docs: https://docs.sqlalchemy.org/en/14/core/custom_types.html#backend-agnostic-guid-type
# with small modifications
class GUID(types.TypeDecorator): # type: ignore
"""Platform-independent GUID type.
Uses PostgreSQL's UUID type, otherwise uses
CHAR(32), storing as stringified hex values.
"""
impl = CHAR
cache_ok = True
def load_dialect_impl(self, dialect: Dialect) -> TypeEngine[Any]:
if dialect.name == "postgresql":
return dialect.type_descriptor(UUID())
else:
return dialect.type_descriptor(CHAR(32))
def process_bind_param(self, value: Any, dialect: Dialect) -> Optional[str]:
if value is None:
return value
elif dialect.name == "postgresql":
return str(value)
else:
if not isinstance(value, uuid.UUID):
return uuid.UUID(value).hex
else:
# hexstring
return value.hex
def process_result_value(self, value: Any, dialect: Dialect) -> Optional[uuid.UUID]:
if value is None:
return value
else:
if not isinstance(value, uuid.UUID):
value = uuid.UUID(value)
return cast(uuid.UUID, value)