48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
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from datetime import datetime
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from sqlalchemy import and_, desc, func, select
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from sqlalchemy.ext.asyncio import AsyncSession
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from db.models import Metrics, MetricsQuery, Query, Url
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###########################################################
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# BLOCK FOR INTERACTION WITH DATABASE IN BUSINESS CONTEXT #
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###########################################################
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class UrlDAL:
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"""Data Access Layer for operating user info"""
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def __init__(self, db_session: AsyncSession):
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self.db_session = db_session
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async def add_new_urls(self, add_values: list[Url]):
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for new_url in add_values:
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query = select(Url).where(Url.url == new_url.url)
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res = await self.db_session.execute(query)
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if res.scalar_one_or_none() is None:
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self.db_session.add(new_url)
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else:
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# If nessessary we can update data here
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pass
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await self.db_session.flush()
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return
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class MetricDAL:
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"""Data Access Layer for operating user info"""
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def __init__(self, db_session: AsyncSession):
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self.db_session = db_session
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async def get_last_metrics_date(self) -> datetime | None:
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query = (
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select(Metrics.date).group_by(Metrics.date).order_by(Metrics.date.desc())
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)
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result = await self.db_session.execute(query)
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if result is None:
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return None
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last_date = result.scalars().first()
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return last_date
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