first commit

app/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.orm import declarative_base
+
+
+DATABASE_URL = "mysql+pymysql://root:example@localhost:3306/wncloud?charset=utf8mb4"
+engine = create_engine(DATABASE_URL)
+SessionLocal = sessionmaker(autoflush=False, bind=engine)
+Base = declarative_base()