217 lines
9.1 KiB
Python
217 lines
9.1 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# @version : 1.0
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# @Creaet Time : 2021/10/18 22:18
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# @File : crud.py
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# @IDE : PyCharm
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# @desc : 数据库 增删改查操作
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# sqlalchemy 查询操作：https://segmentfault.com/a/1190000016767008
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# SQLAlchemy lazy load和eager load: https://www.jianshu.com/p/dfad7c08c57a
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# Mysql中内连接,左连接和右连接的区别总结:https://www.cnblogs.com/restartyang/articles/9080993.html
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# SQLAlchemy join 内连接
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# selectinload 官方文档：
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# https://www.osgeo.cn/sqlalchemy/orm/loading_relationships.html?highlight=selectinload#sqlalchemy.orm.selectinload
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from typing import List
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from fastapi import HTTPException
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from fastapi.encoders import jsonable_encoder
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from sqlalchemy import func, delete, and_
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from sqlalchemy.future import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy.orm import selectinload
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from starlette import status
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from core.logger import logger
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from sqlalchemy.sql.selectable import Select
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class DalBase:
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def __init__(self, db: AsyncSession, model, schema, key_models: dict = None):
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self.db = db
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self.model = model
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self.schema = schema
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self.key_models = key_models
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async def get_data(self, data_id: int = None, options: list = None, schema=None, keys: dict = None, **kwargs):
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"""
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获取单个数据，默认使用 ID 查询，否则使用关键词查询
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:param data_id:
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:param keys: 外键字段查询，内连接
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:param options: 指示应使用select在预加载中加载给定的属性。
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:param schema: 指定使用的序列化对象
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:param kwargs: 关键词参数,
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:param kwargs: order，排序，默认正序，为 desc 是倒叙
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:param kwargs: return_none，是否返回空 None，否认 抛出异常，默认抛出异常
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"""
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order = kwargs.get("order", None)
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return_none = kwargs.get("return_none", False)
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keys_exist = False
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if keys:
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for key, value in keys.items():
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if value and isinstance(value, dict):
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for k, v in value.items():
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if v:
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keys_exist = True
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break
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kwargs_exist = False
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if kwargs:
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for key, value in kwargs.items():
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if key != "order" and key != "return_none" and value and getattr(self.model, key, None):
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kwargs_exist = True
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break
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data = None
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if data_id or kwargs_exist or keys_exist:
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sql = select(self.model).where(self.model.id == data_id) if data_id else select(self.model)
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sql = self.add_filter_condition(sql, keys, options, **kwargs)
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if order and order == "desc":
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sql = sql.order_by(self.model.create_datetime.desc())
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queryset = await self.db.execute(sql)
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data = queryset.scalars().first()
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if not data and return_none:
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return None
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if data and schema:
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return schema.from_orm(data).dict()
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if data:
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return data
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="未找到此数据")
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async def get_datas(self, page: int = 1, limit: int = 10, keys: dict = None, options: list = None
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, schema=None, **kwargs):
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"""
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获取数据列表
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:param page: 页码
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:param limit: 当前页数据量
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:param keys: 外键字段查询
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:param options: 指示应使用select在预加载中加载给定的属性。
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:param schema: 指定使用的序列化对象
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:param kwargs: order，排序，默认正序，为 desc 是倒叙
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:param kwargs: order_field，排序字段
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:param kwargs: return_objs，是否返回对象
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:param kwargs: start_sql，初始 sql
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"""
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order = kwargs.get("order", None)
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order_field = kwargs.get("order_field", None)
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return_objs = kwargs.get("return_objs", False)
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start_sql = kwargs.get("start_sql", None)
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sql = self.add_filter_condition(start_sql if isinstance(start_sql, Select) else select(self.model), keys, options, **kwargs)
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if order_field and order == "desc":
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sql = sql.order_by(getattr(self.model, order_field).desc(), self.model.id.desc())
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elif order_field:
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sql = sql.order_by(getattr(self.model, order_field), self.model.id)
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elif order == "desc":
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sql = sql.order_by(self.model.id.desc())
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if limit != 0:
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sql = sql.offset((page - 1) * limit).limit(limit)
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queryset = await self.db.execute(sql)
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if return_objs:
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return queryset.scalars().all()
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if schema:
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return [schema.from_orm(i).dict() for i in queryset.scalars().all()]
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return [self.out_dict(i) for i in queryset.scalars().all()]
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async def get_count(self, keys: dict = None, **kwargs):
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"""获取数据总数"""
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sql = select(func.count(self.model.id).label('total'))
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sql = self.add_filter_condition(sql, keys, **kwargs)
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queryset = await self.db.execute(sql)
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return queryset.one()['total']
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async def create_data(self, data, return_obj: bool = False, options: list = None, schema=None):
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"""创建数据"""
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if isinstance(data, dict):
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obj = self.model(**data)
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else:
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obj = self.model(**data.dict())
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self.db.add(obj)
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await self.db.flush()
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await self.db.refresh(obj)
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if options:
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obj = await self.get_data(obj.id, options=options)
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if return_obj:
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return obj
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if schema:
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return schema.from_orm(obj).dict()
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return self.out_dict(obj)
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async def put_data(self, data_id: int, data, return_obj: bool = False, options: list = None, schema=None):
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"""
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更新单个数据
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"""
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obj = await self.get_data(data_id, options=options)
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obj_dict = jsonable_encoder(data)
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for key, value in obj_dict.items():
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setattr(obj, key, value)
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await self.db.flush()
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await self.db.refresh(obj)
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if return_obj:
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return obj
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if schema:
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return schema.from_orm(obj).dict()
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return self.out_dict(obj)
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async def delete_datas(self, ids: List[int]):
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"""
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删除多个数据
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"""
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for data_id in ids:
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await self.db.execute(delete(self.model).where(self.model.id == data_id))
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def add_filter_condition(self, sql: select, keys: dict = None, options: list = None, **kwargs) -> select:
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"""
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添加过滤条件，以及内连接过滤条件
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:param sql:
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:param keys: 外键字段查询，内连接
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:param options: 指示应使用select在预加载中加载给定的属性。
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:param kwargs: 关键词参数
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"""
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if keys and self.key_models:
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for key, value in keys.items():
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model = self.key_models.get(key)
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if model:
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sql = sql.join(model)
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for v_key, v_value in value.items():
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if v_value is not None and v_value != "":
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v_attr = getattr(model, v_key, None)
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if not v_attr:
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continue
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if isinstance(v_value, tuple):
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if v_value[0] == "date":
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# 根据日期查询， 关键函数是：func.time_format和func.date_format
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sql = sql.where(func.date_format(v_attr, "%Y-%m-%d") == v_value[1])
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elif v_value[0] == "like":
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sql = sql.where(v_attr.like(f"%{v_value[1]}%"))
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else:
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sql = sql.where(v_attr == v_value)
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else:
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logger.error(f"外键查询报错：{key}模型不存在，无法进行下一步查询。")
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elif keys and not self.key_models:
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logger.error(f"外键查询报错：key_models 外键模型无配置项，无法进行下一步查询。")
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for field in kwargs:
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value = kwargs.get(field)
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if value is not None and value != "":
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attr = getattr(self.model, field, None)
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if not attr:
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continue
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if isinstance(value, tuple):
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if value[0] == "date":
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# 根据日期查询， 关键函数是：func.time_format和func.date_format
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sql = sql.where(func.date_format(attr, "%Y-%m-%d") == value[1])
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elif value[0] == "like":
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sql = sql.where(attr.like(f"%{value[1]}%"))
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else:
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sql = sql.where(attr == value)
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if options:
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sql = sql.options(*[selectinload(i) for i in options])
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return sql
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def out_dict(self, data):
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"""
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序列化
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:param data:
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:return:
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"""
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return self.schema.from_orm(data).dict()
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