CRUDPlus API 参考

CRUDPlus 类是执行 CRUD 操作和关系查询的主要接口。

类定义

sqlalchemy_crud_plus.crud.CRUDPlus

Bases: Generic[Model]

Source code in sqlalchemy_crud_plus/crud.py

class CRUDPlus(Generic[Model]):
    def __init__(self, model: type[Model]):
        self.model = model
        self.primary_key = self._get_primary_key()

    def _get_primary_key(self) -> Column | list[Column]:
        """
        Dynamically retrieve the primary key column(s) for the model.
        """
        mapper = inspect(self.model)
        primary_key = mapper.primary_key
        if len(primary_key) == 1:
            return primary_key[0]
        else:
            return list(primary_key)

    def _get_pk_filter(self, pk: Any | Sequence[Any]) -> list[ColumnExpressionArgument[bool]]:
        """
        Get the primary key filter(s).

        :param pk: Single value for simple primary key, or tuple for composite primary key
        :return:
        """
        if isinstance(self.primary_key, list):
            if len(pk) != len(self.primary_key):
                raise CompositePrimaryKeysError(f'Expected {len(self.primary_key)} values for composite primary key')
            return [column == value for column, value in zip(self.primary_key, pk)]
        else:
            return [self.primary_key == pk]

    async def create_model(
        self,
        session: AsyncSession,
        obj: CreateSchema,
        flush: bool = False,
        commit: bool = False,
        **kwargs,
    ) -> Model:
        """
        Create a new instance of a model.

        :param session: The SQLAlchemy async session
        :param obj: The Pydantic schema containing data to be saved
        :param flush: If `True`, flush all object changes to the database
        :param commit: If `True`, commits the transaction immediately
        :param kwargs: Additional model data not included in the pydantic schema
        :return:
        """
        obj_data = obj.model_dump()
        if kwargs:
            obj_data.update(kwargs)

        ins = self.model(**obj_data)
        session.add(ins)

        if flush:
            await session.flush()
        if commit:
            await session.commit()

        return ins

    async def create_models(
        self,
        session: AsyncSession,
        objs: list[CreateSchema],
        flush: bool = False,
        commit: bool = False,
        **kwargs,
    ) -> list[Model]:
        """
        Create new instances of a model.

        :param session: The SQLAlchemy async session
        :param objs: The Pydantic schema list containing data to be saved
        :param flush: If `True`, flush all object changes to the database
        :param commit: If `True`, commits the transaction immediately
        :param kwargs: Additional model data not included in the pydantic schema
        :return:
        """
        ins_list = []
        for obj in objs:
            obj_data = obj.model_dump()
            if kwargs:
                obj_data.update(kwargs)
            ins = self.model(**obj_data)
            ins_list.append(ins)

        session.add_all(ins_list)

        if flush:
            await session.flush()
        if commit:
            await session.commit()

        return ins_list

    async def bulk_create_models(
        self,
        session: AsyncSession,
        objs: list[dict[str, Any]],
        render_nulls: bool = False,
        flush: bool = False,
        commit: bool = False,
        **kwargs,
    ) -> Sequence[Row[Any] | RowMapping | Any]:
        """
        Create new instances of a model.

        :param session: The SQLAlchemy async session
        :param objs: The dict list containing data to be saved，The dict data should be aligned with the model column
        :param render_nulls: render null values instead of ignoring them
        :param flush: If `True`, flush all object changes to the database
        :param commit: If `True`, commits the transaction immediately
        :param kwargs: Additional model data not included in the dict
        :return:
        """
        stmt = insert(self.model).values(**kwargs).execution_options(render_nulls=render_nulls).returning(self.model)
        result = await session.execute(stmt, objs)

        if flush:
            await session.flush()
        if commit:
            await session.commit()

        return result.scalars().all()

    async def count(
        self,
        session: AsyncSession,
        *whereclause: ColumnExpressionArgument[bool],
        join_conditions: JoinConditions | None = None,
        **kwargs,
    ) -> int:
        """
        Count records that match specified filters.

        :param session: SQLAlchemy async session
        :param whereclause: Additional WHERE clauses
        :param join_conditions: JOIN conditions for relationships
        :param kwargs: Filter expressions using field__operator=value syntax
        :return:
        """
        filters = list(whereclause)

        if kwargs:
            filters.extend(parse_filters(self.model, **kwargs))

        if isinstance(self.primary_key, list):
            stmt = select(func.count()).select_from(self.model)
        else:
            stmt = select(func.count(self.primary_key)).select_from(self.model)

        if filters:
            stmt = stmt.where(*filters)

        if join_conditions:
            stmt = apply_join_conditions(self.model, stmt, join_conditions)

        query = await session.execute(stmt)
        total_count = query.scalar()
        return total_count if total_count is not None else 0

    async def exists(
        self,
        session: AsyncSession,
        *whereclause: ColumnExpressionArgument[bool],
        join_conditions: JoinConditions | None = None,
        **kwargs,
    ) -> bool:
        """
        Check whether records that match the specified filters exist.

        :param session: SQLAlchemy async session
        :param whereclause: Additional WHERE clauses
        :param join_conditions: JOIN conditions for relationships
        :param kwargs: Filter expressions using field__operator=value syntax
        :return:
        """
        filters = list(whereclause)

        if kwargs:
            filters.extend(parse_filters(self.model, **kwargs))

        stmt = select(self.model).where(*filters).limit(1)

        if join_conditions:
            stmt = apply_join_conditions(self.model, stmt, join_conditions)

        query = await session.execute(stmt)
        return query.scalars().first() is not None

    async def select_model(
        self,
        session: AsyncSession,
        pk: Any | Sequence[Any],
        *whereclause: ColumnExpressionArgument[bool],
        load_options: LoadOptions | None = None,
        load_strategies: LoadStrategies | None = None,
        join_conditions: JoinConditions | None = None,
        **kwargs: Any,
    ) -> Model | None:
        """
        Query by primary key(s) with optional relationship loading and joins.

        :param session: SQLAlchemy async session
        :param pk: Primary key value(s) - single value or tuple for composite keys
        :param whereclause: Additional WHERE clauses
        :param load_options: SQLAlchemy loading options
        :param load_strategies: Relationship loading strategies
        :param join_conditions: JOIN conditions for relationships
        :param kwargs: Filter expressions using field__operator=value syntax
        :return:
        """
        filters = list(whereclause)
        filters.extend(self._get_pk_filter(pk))

        if kwargs:
            filters.extend(parse_filters(self.model, **kwargs))

        stmt = select(self.model).where(*filters)

        if load_options:
            stmt = stmt.options(*load_options)

        if join_conditions:
            stmt = apply_join_conditions(self.model, stmt, join_conditions)

        if load_strategies:
            rel_options = build_load_strategies(self.model, load_strategies)
            if rel_options:
                stmt = stmt.options(*rel_options)

        query = await session.execute(stmt)
        return query.scalars().first()

    async def select_model_by_column(
        self,
        session: AsyncSession,
        *whereclause: ColumnExpressionArgument[bool],
        load_options: LoadOptions | None = None,
        load_strategies: LoadStrategies | None = None,
        join_conditions: JoinConditions | None = None,
        **kwargs: Any,
    ) -> Model | None:
        """
        Query by column with optional relationship loading and joins.

        :param session: SQLAlchemy async session
        :param whereclause: Additional WHERE clauses
        :param load_options: SQLAlchemy loading options
        :param load_strategies: Relationship loading strategies
        :param join_conditions: JOIN conditions for relationships
        :param kwargs: Filter expressions using field__operator=value syntax
        :return:
        """
        stmt = await self.select(
            *whereclause,
            load_options=load_options,
            load_strategies=load_strategies,
            join_conditions=join_conditions,
            **kwargs,
        )

        query = await session.execute(stmt)
        return query.scalars().first()

    async def select(
        self,
        *whereclause: ColumnExpressionArgument[bool],
        load_options: LoadOptions | None = None,
        load_strategies: LoadStrategies | None = None,
        join_conditions: JoinConditions | None = None,
        **kwargs,
    ) -> Select:
        """
        Construct the SQLAlchemy selection.

        :param whereclause: WHERE clauses to apply to the query
        :param load_options: SQLAlchemy loading options
        :param load_strategies: Relationship loading strategies
        :param join_conditions: JOIN conditions for relationships
        :param kwargs: Query expressions
        :return:
        """
        filters = list(whereclause)
        filters.extend(parse_filters(self.model, **kwargs))
        stmt = select(self.model).where(*filters)

        if join_conditions:
            stmt = apply_join_conditions(self.model, stmt, join_conditions)

        if load_options:
            stmt = stmt.options(*load_options)

        if load_strategies:
            rel_options = build_load_strategies(self.model, load_strategies)
            if rel_options:
                stmt = stmt.options(*rel_options)

        return stmt

    async def select_order(
        self,
        sort_columns: SortColumns,
        sort_orders: SortOrders = None,
        *whereclause: ColumnExpressionArgument[bool],
        load_options: LoadOptions | None = None,
        load_strategies: LoadStrategies | None = None,
        join_conditions: JoinConditions | None = None,
        **kwargs: Any,
    ) -> Select:
        """
        Construct SQLAlchemy selection with sorting.

        :param sort_columns: Column names to sort by
        :param sort_orders: Sort orders ('asc' or 'desc')
        :param whereclause: WHERE clauses to apply to the query
        :param load_options: SQLAlchemy loading options
        :param load_strategies: Relationship loading strategies
        :param join_conditions: JOIN conditions for relationships
        :param kwargs: Query expressions
        :return:
        """
        stmt = await self.select(
            *whereclause,
            load_options=load_options,
            load_strategies=load_strategies,
            join_conditions=join_conditions,
            **kwargs,
        )
        sorted_stmt = apply_sorting(self.model, stmt, sort_columns, sort_orders)
        return sorted_stmt

    async def select_models(
        self,
        session: AsyncSession,
        *whereclause: ColumnExpressionArgument[bool],
        load_options: LoadOptions | None = None,
        load_strategies: LoadStrategies | None = None,
        join_conditions: JoinConditions | None = None,
        limit: int | None = None,
        offset: int | None = None,
        **kwargs: Any,
    ) -> Sequence[Model]:
        """
        Query all rows that match the specified filters with optional relationship loading and joins.

        :param session: SQLAlchemy async session
        :param whereclause: Additional WHERE clauses
        :param load_options: SQLAlchemy loading options
        :param load_strategies: Relationship loading strategies
        :param join_conditions: JOIN conditions for relationships
        :param limit: Maximum number of results to return
        :param offset: Number of results to skip
        :param kwargs: Filter expressions using field__operator=value syntax
        :return:
        """
        stmt = await self.select(
            *whereclause,
            load_options=load_options,
            load_strategies=load_strategies,
            join_conditions=join_conditions,
            **kwargs,
        )

        if limit is not None:
            stmt = stmt.limit(limit)
        if offset is not None:
            stmt = stmt.offset(offset)

        query = await session.execute(stmt)
        return query.scalars().all()

    async def select_models_order(
        self,
        session: AsyncSession,
        sort_columns: SortColumns,
        sort_orders: SortOrders = None,
        *whereclause: ColumnExpressionArgument[bool],
        load_options: LoadOptions | None = None,
        load_strategies: LoadStrategies | None = None,
        join_conditions: JoinConditions | None = None,
        limit: int | None = None,
        offset: int | None = None,
        **kwargs: Any,
    ) -> Sequence[Model]:
        """
        Query all rows that match the specified filters and sort by columns
        with optional relationship loading and joins.

        :param session: SQLAlchemy async session
        :param sort_columns: Column names to sort by
        :param sort_orders: Sort orders ('asc' or 'desc')
        :param whereclause: Additional WHERE clauses
        :param load_options: SQLAlchemy loading options
        :param load_strategies: Relationship loading strategies
        :param join_conditions: JOIN conditions for relationships
        :param limit: Maximum number of results to return
        :param offset: Number of results to skip
        :param kwargs: Filter expressions using field__operator=value syntax
        :return:
        """
        stmt = await self.select_order(
            sort_columns,
            sort_orders,
            *whereclause,
            load_options=load_options,
            load_strategies=load_strategies,
            join_conditions=join_conditions,
            **kwargs,
        )

        if limit is not None:
            stmt = stmt.limit(limit)
        if offset is not None:
            stmt = stmt.offset(offset)

        query = await session.execute(stmt)
        return query.scalars().all()

    async def update_model(
        self,
        session: AsyncSession,
        pk: Any | Sequence[Any],
        obj: UpdateSchema | dict[str, Any],
        flush: bool = False,
        commit: bool = False,
        **kwargs,
    ) -> int:
        """
        Update an instance by model's primary key

        :param session: The SQLAlchemy async session.
        :param pk: Single value for simple primary key, or tuple for composite primary key.
        :param obj: A pydantic schema or dictionary containing the update data
        :param flush: If `True`, flush all object changes to the database. Default is `False`.
        :param commit: If `True`, commits the transaction immediately. Default is `False`.
        :param kwargs: Additional model data not included in the pydantic schema.
        :return:
        """
        filters = self._get_pk_filter(pk)
        data = obj if isinstance(obj, dict) else obj.model_dump(exclude_unset=True)
        data.update(kwargs)
        stmt = update(self.model).where(*filters).values(**data)
        result = await session.execute(stmt)

        if flush:
            await session.flush()
        if commit:
            await session.commit()

        return result.rowcount

    async def update_model_by_column(
        self,
        session: AsyncSession,
        obj: UpdateSchema | dict[str, Any],
        allow_multiple: bool = False,
        flush: bool = False,
        commit: bool = False,
        **kwargs,
    ) -> int:
        """
        Update records by model column filters.

        :param session: The SQLAlchemy async session
        :param obj: A Pydantic schema or dictionary containing the update data
        :param allow_multiple: If `True`, allows updating multiple records that match the filters
        :param flush: If `True`, flush all object changes to the database
        :param commit: If `True`, commits the transaction immediately
        :param kwargs: Filter expressions using field__operator=value syntax
        :return:
        """
        filters = parse_filters(self.model, **kwargs)

        if not filters:
            raise ValueError('At least one filter condition must be provided for update operation')

        if not allow_multiple:
            total_count = await self.count(session, *filters)
            if total_count > 1:
                raise MultipleResultsError(f'Only one record is expected to be updated, found {total_count} records.')

        data = obj if isinstance(obj, dict) else obj.model_dump(exclude_unset=True)
        stmt = update(self.model).where(*filters).values(**data)
        result = await session.execute(stmt)

        if flush:
            await session.flush()
        if commit:
            await session.commit()

        return result.rowcount

    async def bulk_update_models(
        self,
        session: AsyncSession,
        objs: list[UpdateSchema | dict[str, Any]],
        pk_mode: bool = True,
        flush: bool = False,
        commit: bool = False,
        **kwargs,
    ) -> int:
        """
        Bulk update multiple instances with different data for each record.

        :param session: The SQLAlchemy async session
        :param objs: To save a list of Pydantic schemas or dict for data
        :param pk_mode: Primary key mode, when enabled, the data must contain the primary key data
        :param flush: If `True`, flush all object changes to the database
        :param commit: If `True`, commits the transaction immediately
        :param kwargs: Filter expressions using field__operator=value syntax
        :return:
        """
        if not pk_mode:
            filters = parse_filters(self.model, **kwargs)

            if not filters:
                raise ValueError('At least one filter condition must be provided for update operation')

            datas = [obj if isinstance(obj, dict) else obj.model_dump(exclude_unset=True) for obj in objs]
            stmt = update(self.model).where(*filters)
            conn = await session.connection()
            await conn.execute(stmt, datas)
        else:
            datas = [obj if isinstance(obj, dict) else obj.model_dump(exclude_unset=True) for obj in objs]
            await session.execute(update(self.model), datas)

        if flush:
            await session.flush()
        if commit:
            await session.commit()

        return len(datas)

    async def delete_model(
        self,
        session: AsyncSession,
        pk: Any | Sequence[Any],
        flush: bool = False,
        commit: bool = False,
    ) -> int:
        """
        Delete an instance by model's primary key

        :param session: The SQLAlchemy async session.
        :param pk: Single value for simple primary key, or tuple for composite primary key.
        :param flush: If `True`, flush all object changes to the database. Default is `False`.
        :param commit: If `True`, commits the transaction immediately. Default is `False`.
        :return:
        """
        filters = self._get_pk_filter(pk)

        stmt = delete(self.model).where(*filters)
        result = await session.execute(stmt)

        if flush:
            await session.flush()
        if commit:
            await session.commit()

        return result.rowcount

    async def delete_model_by_column(
        self,
        session: AsyncSession,
        allow_multiple: bool = False,
        logical_deletion: bool = False,
        deleted_flag_column: str = 'del_flag',
        flush: bool = False,
        commit: bool = False,
        **kwargs,
    ) -> int:
        """
        Delete records by model column filters.

        :param session: The SQLAlchemy async session
        :param allow_multiple: If `True`, allows deleting multiple records that match the filters
        :param logical_deletion: If `True`, enable logical deletion instead of physical deletion
        :param deleted_flag_column: Column name for logical deletion flag
        :param flush: If `True`, flush all object changes to the database
        :param commit: If `True`, commits the transaction immediately
        :param kwargs: Filter expressions using field__operator=value syntax
        :return:
        """
        if logical_deletion:
            if not hasattr(self.model, deleted_flag_column):
                raise ModelColumnError(f'Column {deleted_flag_column} is not found in {self.model}')

        filters = parse_filters(self.model, **kwargs)

        if not filters:
            raise ValueError('At least one filter condition must be provided for delete operation')

        if not allow_multiple:
            total_count = await self.count(session, *filters)
            if total_count > 1:
                raise MultipleResultsError(f'Only one record is expected to be deleted, found {total_count} records.')

        stmt = (
            update(self.model).where(*filters).values(**{deleted_flag_column: True})
            if logical_deletion
            else delete(self.model).where(*filters)
        )

        result = await session.execute(stmt)

        if flush:
            await session.flush()
        if commit:
            await session.commit()

        return result.rowcount

create_model async

create_model(session: AsyncSession, obj: CreateSchema, flush: bool = False, commit: bool = False, **kwargs) -> Model

Create a new instance of a model.

参数：

名称	类型	描述	默认
session	AsyncSession	The SQLAlchemy async session	必需
obj	CreateSchema	The Pydantic schema containing data to be saved	必需
flush	bool	If True, flush all object changes to the database	False
commit	bool	If True, commits the transaction immediately	False
kwargs		Additional model data not included in the pydantic schema	{}

返回：

类型	描述
Model

源代码位于： sqlalchemy_crud_plus/crud.py

async def create_model(
    self,
    session: AsyncSession,
    obj: CreateSchema,
    flush: bool = False,
    commit: bool = False,
    **kwargs,
) -> Model:
    """
    Create a new instance of a model.

    :param session: The SQLAlchemy async session
    :param obj: The Pydantic schema containing data to be saved
    :param flush: If `True`, flush all object changes to the database
    :param commit: If `True`, commits the transaction immediately
    :param kwargs: Additional model data not included in the pydantic schema
    :return:
    """
    obj_data = obj.model_dump()
    if kwargs:
        obj_data.update(kwargs)

    ins = self.model(**obj_data)
    session.add(ins)

    if flush:
        await session.flush()
    if commit:
        await session.commit()

    return ins

create_models async

create_models(session: AsyncSession, objs: list[CreateSchema], flush: bool = False, commit: bool = False, **kwargs) -> list[Model]

Create new instances of a model.

参数：

名称	类型	描述	默认
session	AsyncSession	The SQLAlchemy async session	必需
objs	list[CreateSchema]	The Pydantic schema list containing data to be saved	必需
flush	bool	If True, flush all object changes to the database	False
commit	bool	If True, commits the transaction immediately	False
kwargs		Additional model data not included in the pydantic schema	{}

返回：

类型	描述
list[Model]

源代码位于： sqlalchemy_crud_plus/crud.py

async def create_models(
    self,
    session: AsyncSession,
    objs: list[CreateSchema],
    flush: bool = False,
    commit: bool = False,
    **kwargs,
) -> list[Model]:
    """
    Create new instances of a model.

    :param session: The SQLAlchemy async session
    :param objs: The Pydantic schema list containing data to be saved
    :param flush: If `True`, flush all object changes to the database
    :param commit: If `True`, commits the transaction immediately
    :param kwargs: Additional model data not included in the pydantic schema
    :return:
    """
    ins_list = []
    for obj in objs:
        obj_data = obj.model_dump()
        if kwargs:
            obj_data.update(kwargs)
        ins = self.model(**obj_data)
        ins_list.append(ins)

    session.add_all(ins_list)

    if flush:
        await session.flush()
    if commit:
        await session.commit()

    return ins_list

bulk_create_models async

bulk_create_models(session: AsyncSession, objs: list[dict[str, Any]], render_nulls: bool = False, flush: bool = False, commit: bool = False, **kwargs) -> Sequence[Row[Any] | RowMapping | Any]

Create new instances of a model.

参数：

名称	类型	描述	默认
session	AsyncSession	The SQLAlchemy async session	必需
objs	list[dict[str, Any]]	The dict list containing data to be saved，The dict data should be aligned with the model column	必需
render_nulls	bool	render null values instead of ignoring them	False
flush	bool	If True, flush all object changes to the database	False
commit	bool	If True, commits the transaction immediately	False
kwargs		Additional model data not included in the dict	{}

返回：

类型	描述
Sequence[Row[Any] | RowMapping | Any]

源代码位于： sqlalchemy_crud_plus/crud.py

async def bulk_create_models(
    self,
    session: AsyncSession,
    objs: list[dict[str, Any]],
    render_nulls: bool = False,
    flush: bool = False,
    commit: bool = False,
    **kwargs,
) -> Sequence[Row[Any] | RowMapping | Any]:
    """
    Create new instances of a model.

    :param session: The SQLAlchemy async session
    :param objs: The dict list containing data to be saved，The dict data should be aligned with the model column
    :param render_nulls: render null values instead of ignoring them
    :param flush: If `True`, flush all object changes to the database
    :param commit: If `True`, commits the transaction immediately
    :param kwargs: Additional model data not included in the dict
    :return:
    """
    stmt = insert(self.model).values(**kwargs).execution_options(render_nulls=render_nulls).returning(self.model)
    result = await session.execute(stmt, objs)

    if flush:
        await session.flush()
    if commit:
        await session.commit()

    return result.scalars().all()

count async

count(session: AsyncSession, *whereclause: ColumnExpressionArgument[bool], join_conditions: JoinConditions | None = None, **kwargs) -> int

Count records that match specified filters.

参数：

名称	类型	描述	默认
session	AsyncSession	SQLAlchemy async session	必需
whereclause	ColumnExpressionArgument[bool]	Additional WHERE clauses	()
join_conditions	JoinConditions | None	JOIN conditions for relationships	None
kwargs		Filter expressions using field__operator=value syntax	{}

返回：

类型	描述
int

源代码位于： sqlalchemy_crud_plus/crud.py

async def count(
    self,
    session: AsyncSession,
    *whereclause: ColumnExpressionArgument[bool],
    join_conditions: JoinConditions | None = None,
    **kwargs,
) -> int:
    """
    Count records that match specified filters.

    :param session: SQLAlchemy async session
    :param whereclause: Additional WHERE clauses
    :param join_conditions: JOIN conditions for relationships
    :param kwargs: Filter expressions using field__operator=value syntax
    :return:
    """
    filters = list(whereclause)

    if kwargs:
        filters.extend(parse_filters(self.model, **kwargs))

    if isinstance(self.primary_key, list):
        stmt = select(func.count()).select_from(self.model)
    else:
        stmt = select(func.count(self.primary_key)).select_from(self.model)

    if filters:
        stmt = stmt.where(*filters)

    if join_conditions:
        stmt = apply_join_conditions(self.model, stmt, join_conditions)

    query = await session.execute(stmt)
    total_count = query.scalar()
    return total_count if total_count is not None else 0

exists async

exists(session: AsyncSession, *whereclause: ColumnExpressionArgument[bool], join_conditions: JoinConditions | None = None, **kwargs) -> bool

Check whether records that match the specified filters exist.

参数：

名称	类型	描述	默认
session	AsyncSession	SQLAlchemy async session	必需
whereclause	ColumnExpressionArgument[bool]	Additional WHERE clauses	()
join_conditions	JoinConditions | None	JOIN conditions for relationships	None
kwargs		Filter expressions using field__operator=value syntax	{}

返回：

类型	描述
bool

源代码位于： sqlalchemy_crud_plus/crud.py

async def exists(
    self,
    session: AsyncSession,
    *whereclause: ColumnExpressionArgument[bool],
    join_conditions: JoinConditions | None = None,
    **kwargs,
) -> bool:
    """
    Check whether records that match the specified filters exist.

    :param session: SQLAlchemy async session
    :param whereclause: Additional WHERE clauses
    :param join_conditions: JOIN conditions for relationships
    :param kwargs: Filter expressions using field__operator=value syntax
    :return:
    """
    filters = list(whereclause)

    if kwargs:
        filters.extend(parse_filters(self.model, **kwargs))

    stmt = select(self.model).where(*filters).limit(1)

    if join_conditions:
        stmt = apply_join_conditions(self.model, stmt, join_conditions)

    query = await session.execute(stmt)
    return query.scalars().first() is not None

select_model async

select_model(session: AsyncSession, pk: Any | Sequence[Any], *whereclause: ColumnExpressionArgument[bool], load_options: LoadOptions | None = None, load_strategies: LoadStrategies | None = None, join_conditions: JoinConditions | None = None, **kwargs: Any) -> Model | None

Query by primary key(s) with optional relationship loading and joins.

参数：

名称	类型	描述	默认
session	AsyncSession	SQLAlchemy async session	必需
pk	Any | Sequence[Any]	Primary key value(s) - single value or tuple for composite keys	必需
whereclause	ColumnExpressionArgument[bool]	Additional WHERE clauses	()
load_options	LoadOptions | None	SQLAlchemy loading options	None
load_strategies	LoadStrategies | None	Relationship loading strategies	None
join_conditions	JoinConditions | None	JOIN conditions for relationships	None
kwargs	Any	Filter expressions using field__operator=value syntax	{}

返回：

类型	描述
Model | None

源代码位于： sqlalchemy_crud_plus/crud.py

async def select_model(
    self,
    session: AsyncSession,
    pk: Any | Sequence[Any],
    *whereclause: ColumnExpressionArgument[bool],
    load_options: LoadOptions | None = None,
    load_strategies: LoadStrategies | None = None,
    join_conditions: JoinConditions | None = None,
    **kwargs: Any,
) -> Model | None:
    """
    Query by primary key(s) with optional relationship loading and joins.

    :param session: SQLAlchemy async session
    :param pk: Primary key value(s) - single value or tuple for composite keys
    :param whereclause: Additional WHERE clauses
    :param load_options: SQLAlchemy loading options
    :param load_strategies: Relationship loading strategies
    :param join_conditions: JOIN conditions for relationships
    :param kwargs: Filter expressions using field__operator=value syntax
    :return:
    """
    filters = list(whereclause)
    filters.extend(self._get_pk_filter(pk))

    if kwargs:
        filters.extend(parse_filters(self.model, **kwargs))

    stmt = select(self.model).where(*filters)

    if load_options:
        stmt = stmt.options(*load_options)

    if join_conditions:
        stmt = apply_join_conditions(self.model, stmt, join_conditions)

    if load_strategies:
        rel_options = build_load_strategies(self.model, load_strategies)
        if rel_options:
            stmt = stmt.options(*rel_options)

    query = await session.execute(stmt)
    return query.scalars().first()

select_model_by_column async

select_model_by_column(session: AsyncSession, *whereclause: ColumnExpressionArgument[bool], load_options: LoadOptions | None = None, load_strategies: LoadStrategies | None = None, join_conditions: JoinConditions | None = None, **kwargs: Any) -> Model | None

Query by column with optional relationship loading and joins.

参数：

名称	类型	描述	默认
session	AsyncSession	SQLAlchemy async session	必需
whereclause	ColumnExpressionArgument[bool]	Additional WHERE clauses	()
load_options	LoadOptions | None	SQLAlchemy loading options	None
load_strategies	LoadStrategies | None	Relationship loading strategies	None
join_conditions	JoinConditions | None	JOIN conditions for relationships	None
kwargs	Any	Filter expressions using field__operator=value syntax	{}

返回：

类型	描述
Model | None

源代码位于： sqlalchemy_crud_plus/crud.py

async def select_model_by_column(
    self,
    session: AsyncSession,
    *whereclause: ColumnExpressionArgument[bool],
    load_options: LoadOptions | None = None,
    load_strategies: LoadStrategies | None = None,
    join_conditions: JoinConditions | None = None,
    **kwargs: Any,
) -> Model | None:
    """
    Query by column with optional relationship loading and joins.

    :param session: SQLAlchemy async session
    :param whereclause: Additional WHERE clauses
    :param load_options: SQLAlchemy loading options
    :param load_strategies: Relationship loading strategies
    :param join_conditions: JOIN conditions for relationships
    :param kwargs: Filter expressions using field__operator=value syntax
    :return:
    """
    stmt = await self.select(
        *whereclause,
        load_options=load_options,
        load_strategies=load_strategies,
        join_conditions=join_conditions,
        **kwargs,
    )

    query = await session.execute(stmt)
    return query.scalars().first()

select async

select(*whereclause: ColumnExpressionArgument[bool], load_options: LoadOptions | None = None, load_strategies: LoadStrategies | None = None, join_conditions: JoinConditions | None = None, **kwargs) -> Select

Construct the SQLAlchemy selection.

参数：

名称	类型	描述	默认
whereclause	ColumnExpressionArgument[bool]	WHERE clauses to apply to the query	()
load_options	LoadOptions | None	SQLAlchemy loading options	None
load_strategies	LoadStrategies | None	Relationship loading strategies	None
join_conditions	JoinConditions | None	JOIN conditions for relationships	None
kwargs		Query expressions	{}

返回：

类型	描述
Select

源代码位于： sqlalchemy_crud_plus/crud.py

async def select(
    self,
    *whereclause: ColumnExpressionArgument[bool],
    load_options: LoadOptions | None = None,
    load_strategies: LoadStrategies | None = None,
    join_conditions: JoinConditions | None = None,
    **kwargs,
) -> Select:
    """
    Construct the SQLAlchemy selection.

    :param whereclause: WHERE clauses to apply to the query
    :param load_options: SQLAlchemy loading options
    :param load_strategies: Relationship loading strategies
    :param join_conditions: JOIN conditions for relationships
    :param kwargs: Query expressions
    :return:
    """
    filters = list(whereclause)
    filters.extend(parse_filters(self.model, **kwargs))
    stmt = select(self.model).where(*filters)

    if join_conditions:
        stmt = apply_join_conditions(self.model, stmt, join_conditions)

    if load_options:
        stmt = stmt.options(*load_options)

    if load_strategies:
        rel_options = build_load_strategies(self.model, load_strategies)
        if rel_options:
            stmt = stmt.options(*rel_options)

    return stmt

select_order async

select_order(sort_columns: SortColumns, sort_orders: SortOrders = None, *whereclause: ColumnExpressionArgument[bool], load_options: LoadOptions | None = None, load_strategies: LoadStrategies | None = None, join_conditions: JoinConditions | None = None, **kwargs: Any) -> Select

Construct SQLAlchemy selection with sorting.

参数：

名称	类型	描述	默认
sort_columns	SortColumns	Column names to sort by	必需
sort_orders	SortOrders	Sort orders ('asc' or 'desc')	None
whereclause	ColumnExpressionArgument[bool]	WHERE clauses to apply to the query	()
load_options	LoadOptions | None	SQLAlchemy loading options	None
load_strategies	LoadStrategies | None	Relationship loading strategies	None
join_conditions	JoinConditions | None	JOIN conditions for relationships	None
kwargs	Any	Query expressions	{}

返回：

类型	描述
Select

源代码位于： sqlalchemy_crud_plus/crud.py

async def select_order(
    self,
    sort_columns: SortColumns,
    sort_orders: SortOrders = None,
    *whereclause: ColumnExpressionArgument[bool],
    load_options: LoadOptions | None = None,
    load_strategies: LoadStrategies | None = None,
    join_conditions: JoinConditions | None = None,
    **kwargs: Any,
) -> Select:
    """
    Construct SQLAlchemy selection with sorting.

    :param sort_columns: Column names to sort by
    :param sort_orders: Sort orders ('asc' or 'desc')
    :param whereclause: WHERE clauses to apply to the query
    :param load_options: SQLAlchemy loading options
    :param load_strategies: Relationship loading strategies
    :param join_conditions: JOIN conditions for relationships
    :param kwargs: Query expressions
    :return:
    """
    stmt = await self.select(
        *whereclause,
        load_options=load_options,
        load_strategies=load_strategies,
        join_conditions=join_conditions,
        **kwargs,
    )
    sorted_stmt = apply_sorting(self.model, stmt, sort_columns, sort_orders)
    return sorted_stmt

select_models async

select_models(session: AsyncSession, *whereclause: ColumnExpressionArgument[bool], load_options: LoadOptions | None = None, load_strategies: LoadStrategies | None = None, join_conditions: JoinConditions | None = None, limit: int | None = None, offset: int | None = None, **kwargs: Any) -> Sequence[Model]

Query all rows that match the specified filters with optional relationship loading and joins.

参数：

名称	类型	描述	默认
session	AsyncSession	SQLAlchemy async session	必需
whereclause	ColumnExpressionArgument[bool]	Additional WHERE clauses	()
load_options	LoadOptions | None	SQLAlchemy loading options	None
load_strategies	LoadStrategies | None	Relationship loading strategies	None
join_conditions	JoinConditions | None	JOIN conditions for relationships	None
limit	int | None	Maximum number of results to return	None
offset	int | None	Number of results to skip	None
kwargs	Any	Filter expressions using field__operator=value syntax	{}

返回：

类型	描述
Sequence[Model]

源代码位于： sqlalchemy_crud_plus/crud.py

async def select_models(
    self,
    session: AsyncSession,
    *whereclause: ColumnExpressionArgument[bool],
    load_options: LoadOptions | None = None,
    load_strategies: LoadStrategies | None = None,
    join_conditions: JoinConditions | None = None,
    limit: int | None = None,
    offset: int | None = None,
    **kwargs: Any,
) -> Sequence[Model]:
    """
    Query all rows that match the specified filters with optional relationship loading and joins.

    :param session: SQLAlchemy async session
    :param whereclause: Additional WHERE clauses
    :param load_options: SQLAlchemy loading options
    :param load_strategies: Relationship loading strategies
    :param join_conditions: JOIN conditions for relationships
    :param limit: Maximum number of results to return
    :param offset: Number of results to skip
    :param kwargs: Filter expressions using field__operator=value syntax
    :return:
    """
    stmt = await self.select(
        *whereclause,
        load_options=load_options,
        load_strategies=load_strategies,
        join_conditions=join_conditions,
        **kwargs,
    )

    if limit is not None:
        stmt = stmt.limit(limit)
    if offset is not None:
        stmt = stmt.offset(offset)

    query = await session.execute(stmt)
    return query.scalars().all()

select_models_order async

select_models_order(session: AsyncSession, sort_columns: SortColumns, sort_orders: SortOrders = None, *whereclause: ColumnExpressionArgument[bool], load_options: LoadOptions | None = None, load_strategies: LoadStrategies | None = None, join_conditions: JoinConditions | None = None, limit: int | None = None, offset: int | None = None, **kwargs: Any) -> Sequence[Model]

Query all rows that match the specified filters and sort by columns with optional relationship loading and joins.

参数：

名称	类型	描述	默认
session	AsyncSession	SQLAlchemy async session	必需
sort_columns	SortColumns	Column names to sort by	必需
sort_orders	SortOrders	Sort orders ('asc' or 'desc')	None
whereclause	ColumnExpressionArgument[bool]	Additional WHERE clauses	()
load_options	LoadOptions | None	SQLAlchemy loading options	None
load_strategies	LoadStrategies | None	Relationship loading strategies	None
join_conditions	JoinConditions | None	JOIN conditions for relationships	None
limit	int | None	Maximum number of results to return	None
offset	int | None	Number of results to skip	None
kwargs	Any	Filter expressions using field__operator=value syntax	{}

返回：

类型	描述
Sequence[Model]

源代码位于： sqlalchemy_crud_plus/crud.py

async def select_models_order(
    self,
    session: AsyncSession,
    sort_columns: SortColumns,
    sort_orders: SortOrders = None,
    *whereclause: ColumnExpressionArgument[bool],
    load_options: LoadOptions | None = None,
    load_strategies: LoadStrategies | None = None,
    join_conditions: JoinConditions | None = None,
    limit: int | None = None,
    offset: int | None = None,
    **kwargs: Any,
) -> Sequence[Model]:
    """
    Query all rows that match the specified filters and sort by columns
    with optional relationship loading and joins.

    :param session: SQLAlchemy async session
    :param sort_columns: Column names to sort by
    :param sort_orders: Sort orders ('asc' or 'desc')
    :param whereclause: Additional WHERE clauses
    :param load_options: SQLAlchemy loading options
    :param load_strategies: Relationship loading strategies
    :param join_conditions: JOIN conditions for relationships
    :param limit: Maximum number of results to return
    :param offset: Number of results to skip
    :param kwargs: Filter expressions using field__operator=value syntax
    :return:
    """
    stmt = await self.select_order(
        sort_columns,
        sort_orders,
        *whereclause,
        load_options=load_options,
        load_strategies=load_strategies,
        join_conditions=join_conditions,
        **kwargs,
    )

    if limit is not None:
        stmt = stmt.limit(limit)
    if offset is not None:
        stmt = stmt.offset(offset)

    query = await session.execute(stmt)
    return query.scalars().all()

update_model async

update_model(session: AsyncSession, pk: Any | Sequence[Any], obj: UpdateSchema | dict[str, Any], flush: bool = False, commit: bool = False, **kwargs) -> int

Update an instance by model's primary key

参数：

名称	类型	描述	默认
session	AsyncSession	The SQLAlchemy async session.	必需
pk	Any | Sequence[Any]	Single value for simple primary key, or tuple for composite primary key.	必需
obj	UpdateSchema | dict[str, Any]	A pydantic schema or dictionary containing the update data	必需
flush	bool	If True, flush all object changes to the database. Default is False.	False
commit	bool	If True, commits the transaction immediately. Default is False.	False
kwargs		Additional model data not included in the pydantic schema.	{}

返回：

类型	描述
int

源代码位于： sqlalchemy_crud_plus/crud.py

async def update_model(
    self,
    session: AsyncSession,
    pk: Any | Sequence[Any],
    obj: UpdateSchema | dict[str, Any],
    flush: bool = False,
    commit: bool = False,
    **kwargs,
) -> int:
    """
    Update an instance by model's primary key

    :param session: The SQLAlchemy async session.
    :param pk: Single value for simple primary key, or tuple for composite primary key.
    :param obj: A pydantic schema or dictionary containing the update data
    :param flush: If `True`, flush all object changes to the database. Default is `False`.
    :param commit: If `True`, commits the transaction immediately. Default is `False`.
    :param kwargs: Additional model data not included in the pydantic schema.
    :return:
    """
    filters = self._get_pk_filter(pk)
    data = obj if isinstance(obj, dict) else obj.model_dump(exclude_unset=True)
    data.update(kwargs)
    stmt = update(self.model).where(*filters).values(**data)
    result = await session.execute(stmt)

    if flush:
        await session.flush()
    if commit:
        await session.commit()

    return result.rowcount

update_model_by_column async

update_model_by_column(session: AsyncSession, obj: UpdateSchema | dict[str, Any], allow_multiple: bool = False, flush: bool = False, commit: bool = False, **kwargs) -> int

Update records by model column filters.

参数：

名称	类型	描述	默认
session	AsyncSession	The SQLAlchemy async session	必需
obj	UpdateSchema | dict[str, Any]	A Pydantic schema or dictionary containing the update data	必需
allow_multiple	bool	If True, allows updating multiple records that match the filters	False
flush	bool	If True, flush all object changes to the database	False
commit	bool	If True, commits the transaction immediately	False
kwargs		Filter expressions using field__operator=value syntax	{}

返回：

类型	描述
int

源代码位于： sqlalchemy_crud_plus/crud.py

async def update_model_by_column(
    self,
    session: AsyncSession,
    obj: UpdateSchema | dict[str, Any],
    allow_multiple: bool = False,
    flush: bool = False,
    commit: bool = False,
    **kwargs,
) -> int:
    """
    Update records by model column filters.

    :param session: The SQLAlchemy async session
    :param obj: A Pydantic schema or dictionary containing the update data
    :param allow_multiple: If `True`, allows updating multiple records that match the filters
    :param flush: If `True`, flush all object changes to the database
    :param commit: If `True`, commits the transaction immediately
    :param kwargs: Filter expressions using field__operator=value syntax
    :return:
    """
    filters = parse_filters(self.model, **kwargs)

    if not filters:
        raise ValueError('At least one filter condition must be provided for update operation')

    if not allow_multiple:
        total_count = await self.count(session, *filters)
        if total_count > 1:
            raise MultipleResultsError(f'Only one record is expected to be updated, found {total_count} records.')

    data = obj if isinstance(obj, dict) else obj.model_dump(exclude_unset=True)
    stmt = update(self.model).where(*filters).values(**data)
    result = await session.execute(stmt)

    if flush:
        await session.flush()
    if commit:
        await session.commit()

    return result.rowcount

bulk_update_models async

bulk_update_models(session: AsyncSession, objs: list[UpdateSchema | dict[str, Any]], pk_mode: bool = True, flush: bool = False, commit: bool = False, **kwargs) -> int

Bulk update multiple instances with different data for each record.

参数：

名称	类型	描述	默认
session	AsyncSession	The SQLAlchemy async session	必需
objs	list[UpdateSchema | dict[str, Any]]	To save a list of Pydantic schemas or dict for data	必需
pk_mode	bool	Primary key mode, when enabled, the data must contain the primary key data	True
flush	bool	If True, flush all object changes to the database	False
commit	bool	If True, commits the transaction immediately	False
kwargs		Filter expressions using field__operator=value syntax	{}

返回：

类型	描述
int

源代码位于： sqlalchemy_crud_plus/crud.py

async def bulk_update_models(
    self,
    session: AsyncSession,
    objs: list[UpdateSchema | dict[str, Any]],
    pk_mode: bool = True,
    flush: bool = False,
    commit: bool = False,
    **kwargs,
) -> int:
    """
    Bulk update multiple instances with different data for each record.

    :param session: The SQLAlchemy async session
    :param objs: To save a list of Pydantic schemas or dict for data
    :param pk_mode: Primary key mode, when enabled, the data must contain the primary key data
    :param flush: If `True`, flush all object changes to the database
    :param commit: If `True`, commits the transaction immediately
    :param kwargs: Filter expressions using field__operator=value syntax
    :return:
    """
    if not pk_mode:
        filters = parse_filters(self.model, **kwargs)

        if not filters:
            raise ValueError('At least one filter condition must be provided for update operation')

        datas = [obj if isinstance(obj, dict) else obj.model_dump(exclude_unset=True) for obj in objs]
        stmt = update(self.model).where(*filters)
        conn = await session.connection()
        await conn.execute(stmt, datas)
    else:
        datas = [obj if isinstance(obj, dict) else obj.model_dump(exclude_unset=True) for obj in objs]
        await session.execute(update(self.model), datas)

    if flush:
        await session.flush()
    if commit:
        await session.commit()

    return len(datas)

delete_model async

delete_model(session: AsyncSession, pk: Any | Sequence[Any], flush: bool = False, commit: bool = False) -> int

Delete an instance by model's primary key

参数：

名称	类型	描述	默认
session	AsyncSession	The SQLAlchemy async session.	必需
pk	Any | Sequence[Any]	Single value for simple primary key, or tuple for composite primary key.	必需
flush	bool	If True, flush all object changes to the database. Default is False.	False
commit	bool	If True, commits the transaction immediately. Default is False.	False

返回：

类型	描述
int

源代码位于： sqlalchemy_crud_plus/crud.py

async def delete_model(
    self,
    session: AsyncSession,
    pk: Any | Sequence[Any],
    flush: bool = False,
    commit: bool = False,
) -> int:
    """
    Delete an instance by model's primary key

    :param session: The SQLAlchemy async session.
    :param pk: Single value for simple primary key, or tuple for composite primary key.
    :param flush: If `True`, flush all object changes to the database. Default is `False`.
    :param commit: If `True`, commits the transaction immediately. Default is `False`.
    :return:
    """
    filters = self._get_pk_filter(pk)

    stmt = delete(self.model).where(*filters)
    result = await session.execute(stmt)

    if flush:
        await session.flush()
    if commit:
        await session.commit()

    return result.rowcount

delete_model_by_column async

delete_model_by_column(session: AsyncSession, allow_multiple: bool = False, logical_deletion: bool = False, deleted_flag_column: str = 'del_flag', flush: bool = False, commit: bool = False, **kwargs) -> int

Delete records by model column filters.

参数：

名称	类型	描述	默认
session	AsyncSession	The SQLAlchemy async session	必需
allow_multiple	bool	If True, allows deleting multiple records that match the filters	False
logical_deletion	bool	If True, enable logical deletion instead of physical deletion	False
deleted_flag_column	str	Column name for logical deletion flag	'del_flag'
flush	bool	If True, flush all object changes to the database	False
commit	bool	If True, commits the transaction immediately	False
kwargs		Filter expressions using field__operator=value syntax	{}

返回：

类型	描述
int

源代码位于： sqlalchemy_crud_plus/crud.py

async def delete_model_by_column(
    self,
    session: AsyncSession,
    allow_multiple: bool = False,
    logical_deletion: bool = False,
    deleted_flag_column: str = 'del_flag',
    flush: bool = False,
    commit: bool = False,
    **kwargs,
) -> int:
    """
    Delete records by model column filters.

    :param session: The SQLAlchemy async session
    :param allow_multiple: If `True`, allows deleting multiple records that match the filters
    :param logical_deletion: If `True`, enable logical deletion instead of physical deletion
    :param deleted_flag_column: Column name for logical deletion flag
    :param flush: If `True`, flush all object changes to the database
    :param commit: If `True`, commits the transaction immediately
    :param kwargs: Filter expressions using field__operator=value syntax
    :return:
    """
    if logical_deletion:
        if not hasattr(self.model, deleted_flag_column):
            raise ModelColumnError(f'Column {deleted_flag_column} is not found in {self.model}')

    filters = parse_filters(self.model, **kwargs)

    if not filters:
        raise ValueError('At least one filter condition must be provided for delete operation')

    if not allow_multiple:
        total_count = await self.count(session, *filters)
        if total_count > 1:
            raise MultipleResultsError(f'Only one record is expected to be deleted, found {total_count} records.')

    stmt = (
        update(self.model).where(*filters).values(**{deleted_flag_column: True})
        if logical_deletion
        else delete(self.model).where(*filters)
    )

    result = await session.execute(stmt)

    if flush:
        await session.flush()
    if commit:
        await session.commit()

    return result.rowcount