diff --git a/README.md b/README.md
index d7137ae..67041b0 100644
--- a/README.md
+++ b/README.md
@@ -1,22 +1,17 @@
 # sqlalchemy-crud-plus
 
-基于 SQLAlChemy2 模型的异步 CRUD 操作
+Asynchronous CRUD operations based on SQLAlChemy 2.0
 
-## 下载
+## Download
 
 ```shell
 pip install sqlalchemy-crud-plus
 ```
 
-## TODO
-
-- [ ] ...
-
 ## Use
 
-以下仅为简易示例
-
 ```python
+# example:
 from sqlalchemy.orm import declarative_base
 from sqlalchemy_crud_plus import CRUDPlus
 
@@ -34,7 +29,7 @@ class CRUDIns(CRUDPlus[ModelIns]):
 
 
 # singleton
-ins_dao = CRUDIns(ModelIns)
+ins_dao: CRUDIns = CRUDIns(ModelIns)
 ```
 
 ## 互动
diff --git a/pyproject.toml b/pyproject.toml
index 4f92917..49f93c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,7 +49,6 @@ select = [
     "I"
 ]
 preview = true
-ignore-init-module-imports = true
 
 [tool.ruff.lint.isort]
 lines-between-types = 1
diff --git a/sqlalchemy_crud_plus/crud.py b/sqlalchemy_crud_plus/crud.py
index 3a24e97..11b6c1f 100644
--- a/sqlalchemy_crud_plus/crud.py
+++ b/sqlalchemy_crud_plus/crud.py
@@ -19,33 +19,43 @@ class CRUDPlus(Generic[_Model]):
     def __init__(self, model: Type[_Model]):
         self.model = model
 
-    async def create_model(self, session: AsyncSession, obj: _CreateSchema, **kwargs) -> None:
+    async def create_model(self, session: AsyncSession, obj: _CreateSchema, commit: bool = False, **kwargs) -> _Model:
         """
         Create a new instance of a model
 
         :param session:
         :param obj:
+        :param commit:
         :param kwargs:
         :return:
         """
         if kwargs:
-            instance = self.model(**obj.model_dump(), **kwargs)
+            ins = self.model(**obj.model_dump(), **kwargs)
         else:
-            instance = self.model(**obj.model_dump())
-        session.add(instance)
+            ins = self.model(**obj.model_dump())
+        session.add(ins)
+        if commit:
+            await session.commit()
+        return ins
 
-    async def create_models(self, session: AsyncSession, obj: Iterable[_CreateSchema]) -> None:
+    async def create_models(
+        self, session: AsyncSession, obj: Iterable[_CreateSchema], commit: bool = False
+    ) -> list[_Model]:
         """
         Create new instances of a model
 
         :param session:
         :param obj:
+        :param commit:
         :return:
         """
-        instance_list = []
+        ins_list = []
         for i in obj:
-            instance_list.append(self.model(**i.model_dump()))
-        session.add_all(instance_list)
+            ins_list.append(self.model(**i.model_dump()))
+        session.add_all(ins_list)
+        if commit:
+            await session.commit()
+        return ins_list
 
     async def select_model_by_id(self, session: AsyncSession, pk: int) -> _Model | None:
         """
@@ -55,7 +65,8 @@ async def select_model_by_id(self, session: AsyncSession, pk: int) -> _Model | N
         :param pk:
         :return:
         """
-        query = await session.execute(select(self.model).where(self.model.id == pk))
+        stmt = select(self.model).where(self.model.id == pk)
+        query = await session.execute(stmt)
         return query.scalars().first()
 
     async def select_model_by_column(self, session: AsyncSession, column: str, column_value: Any) -> _Model | None:
@@ -69,10 +80,11 @@ async def select_model_by_column(self, session: AsyncSession, column: str, colum
         """
         if hasattr(self.model, column):
             model_column = getattr(self.model, column)
-            query = await session.execute(select(self.model).where(model_column == column_value))  # type: ignore
+            stmt = select(self.model).where(model_column == column_value)  # type: ignore
+            query = await session.execute(stmt)
             return query.scalars().first()
         else:
-            raise ModelColumnError(f'Model column {column} is not found')
+            raise ModelColumnError(f'Column {column} is not found in {self.model}')
 
     async def select_model_by_columns(
         self, session: AsyncSession, expression: Literal['and', 'or'] = 'and', **conditions
@@ -91,31 +103,36 @@ async def select_model_by_columns(
                 model_column = getattr(self.model, column)
                 where_list.append(model_column == value)
             else:
-                raise ModelColumnError(f'Model column {column} is not found')
+                raise ModelColumnError(f'Column {column} is not found in {self.model}')
         match expression:
             case 'and':
-                query = await session.execute(select(self.model).where(and_(*where_list)))
+                stmt = select(self.model).where(and_(*where_list))
+                query = await session.execute(stmt)
             case 'or':
-                query = await session.execute(select(self.model).where(or_(*where_list)))
+                stmt = select(self.model).where(or_(*where_list))
+                query = await session.execute(stmt)
             case _:
-                raise SelectExpressionError(f'select expression {expression} is not supported')
+                raise SelectExpressionError(
+                    f'Select expression {expression} is not supported, only supports `and`, `or`'
+                )
         return query.scalars().first()
 
-    async def select_models(self, session: AsyncSession) -> Sequence[Row | RowMapping | Any] | None:
+    async def select_models(self, session: AsyncSession) -> Sequence[Row[Any] | RowMapping | Any]:
         """
         Query all rows
 
         :param session:
         :return:
         """
-        query = await session.execute(select(self.model))
+        stmt = select(self.model)
+        query = await session.execute(stmt)
         return query.scalars().all()
 
     async def select_models_order(
         self,
         session: AsyncSession,
         *columns,
-        model_sort: Literal['default', 'asc', 'desc'] = 'default',
+        model_sort: Literal['asc', 'desc'] = 'desc',
     ) -> Sequence[Row | RowMapping | Any] | None:
         """
         Query all rows asc or desc
@@ -131,25 +148,28 @@ async def select_models_order(
                 model_column = getattr(self.model, column)
                 sort_list.append(model_column)
             else:
-                raise ModelColumnError(f'Model column {column} is not found')
+                raise ModelColumnError(f'Column {column} is not found in {self.model}')
         match model_sort:
-            case 'default':
-                query = await session.execute(select(self.model).order_by(*sort_list))
             case 'asc':
                 query = await session.execute(select(self.model).order_by(asc(*sort_list)))
             case 'desc':
                 query = await session.execute(select(self.model).order_by(desc(*sort_list)))
             case _:
-                raise SelectExpressionError(f'select sort expression {model_sort} is not supported')
+                raise SelectExpressionError(
+                    f'Select sort expression {model_sort} is not supported, only supports `asc`, `desc`'
+                )
         return query.scalars().all()
 
-    async def update_model(self, session: AsyncSession, pk: int, obj: _UpdateSchema | dict[str, Any], **kwargs) -> int:
+    async def update_model(
+        self, session: AsyncSession, pk: int, obj: _UpdateSchema | dict[str, Any], commit: bool = False, **kwargs
+    ) -> int:
         """
         Update an instance of model's primary key
 
         :param session:
         :param pk:
         :param obj:
+        :param commit:
         :param kwargs:
         :return:
         """
@@ -159,11 +179,20 @@ async def update_model(self, session: AsyncSession, pk: int, obj: _UpdateSchema
             instance_data = obj.model_dump(exclude_unset=True)
         if kwargs:
             instance_data.update(kwargs)
-        result = await session.execute(sa_update(self.model).where(self.model.id == pk).values(**instance_data))
+        stmt = sa_update(self.model).where(self.model.id == pk).values(**instance_data)
+        result = await session.execute(stmt)
+        if commit:
+            await session.commit()
         return result.rowcount  # type: ignore
 
     async def update_model_by_column(
-        self, session: AsyncSession, column: str, column_value: Any, obj: _UpdateSchema | dict[str, Any], **kwargs
+        self,
+        session: AsyncSession,
+        column: str,
+        column_value: Any,
+        obj: _UpdateSchema | dict[str, Any],
+        commit: bool = False,
+        **kwargs,
     ) -> int:
         """
         Update an instance of model column
@@ -172,6 +201,7 @@ async def update_model_by_column(
         :param column:
         :param column_value:
         :param obj:
+        :param commit:
         :param kwargs:
         :return:
         """
@@ -184,23 +214,29 @@ async def update_model_by_column(
         if hasattr(self.model, column):
             model_column = getattr(self.model, column)
         else:
-            raise ModelColumnError(f'Model column {column} is not found')
-        result = await session.execute(
-            sa_update(self.model).where(model_column == column_value).values(**instance_data)
-        )
+            raise ModelColumnError(f'Column {column} is not found in {self.model}')
+        stmt = sa_update(self.model).where(model_column == column_value).values(**instance_data)  # type: ignore
+        result = await session.execute(stmt)
+        if commit:
+            await session.commit()
         return result.rowcount  # type: ignore
 
-    async def delete_model(self, session: AsyncSession, pk: int, **kwargs) -> int:
+    async def delete_model(self, session: AsyncSession, pk: int, commit: bool = False, **kwargs) -> int:
         """
         Delete an instance of a model
 
         :param session:
         :param pk:
+        :param commit:
         :param kwargs: for soft deletion only
         :return:
         """
         if not kwargs:
-            result = await session.execute(sa_delete(self.model).where(self.model.id == pk))
+            stmt = sa_delete(self.model).where(self.model.id == pk)
+            result = await session.execute(stmt)
         else:
-            result = await session.execute(sa_update(self.model).where(self.model.id == pk).values(**kwargs))
+            stmt = sa_update(self.model).where(self.model.id == pk).values(**kwargs)
+            result = await session.execute(stmt)
+        if commit:
+            await session.commit()
         return result.rowcount  # type: ignore