mirror of
https://github.com/Dvorinka/swingmusic-extended.git
synced 2026-06-03 20:13:02 +00:00
cwilvx
86fabcd5e3
+ merge main.py and manage.py + move start logic to swingmusic/__main__.py + add a run.py on the project root
79 lines
2.2 KiB
Python
79 lines
2.2 KiB
Python
from contextlib import contextmanager
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from sqlalchemy import Engine, create_engine, event
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from sqlalchemy.orm import sessionmaker
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from swingmusic.settings import DbPaths
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@event.listens_for(Engine, "connect")
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def set_sqlite_pragma(dbapi_connection, connection_record):
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cursor = dbapi_connection.cursor()
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cursor.execute("PRAGMA journal_mode=WAL")
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cursor.execute("PRAGMA synchronous=NORMAL")
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cursor.execute("PRAGMA cache_size=10000")
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cursor.execute("PRAGMA foreign_keys=ON")
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cursor.execute("PRAGMA temp_store=FILE")
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cursor.execute("PRAGMA mmap_size=0")
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cursor.close()
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class classproperty(property):
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"""
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A class property decorator.
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"""
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def __get__(self, owner_self, owner_cls):
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if self.fget:
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return self.fget(owner_cls)
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class DbEngine:
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"""
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The database engine instance.
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"""
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_engine: Engine | None = None
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@classproperty
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def engine(cls) -> Engine:
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if not cls._engine:
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cls._engine = create_engine(
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f"sqlite+pysqlite:///{DbPaths.get_app_db_path()}",
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echo=False,
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max_overflow=20,
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pool_size=10,
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)
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return cls._engine
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@classmethod
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@contextmanager
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def manager(cls, commit: bool = False):
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"""
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This context manager manages access to the database.
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When the context manager is entered, it returns a session object that can be used to execute SQL statements.
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If the `commit` parameter is set to `True`, the context manager will commit the transaction when it exits.
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"""
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Session = sessionmaker(cls.engine)
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try:
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with Session() as session:
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yield session
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if commit:
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session.commit()
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# yield session.execution_options(preserve_rowcount=True, yield_per=100)
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# yield conn.execution_options(preserve_rowcount=True, yield_per=100)
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except Exception as e:
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session.rollback()
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raise e
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finally:
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if commit:
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session.commit()
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session.close()
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# del conn
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# cls.engine.clear_compiled_cache()
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