Pythonで学ぶデータベース入門
Jason Myers
Co-Author of Essential SQLAlchemy and Software Engineer
delete()
where()
from sqlalchemy import delete stmt = select([func.count(extra_employees.columns.id)]) connection.execute(stmt).scalar()
from sqlalchemy import delete
stmt = select([func.count(extra_employees.columns.id)])
connection.execute(stmt).scalar()
3
delete_stmt = delete(extra_employees) result_proxy = connection.execute(delete_stmt) result_proxy.rowcount
delete_stmt = delete(extra_employees)
result_proxy = connection.execute(delete_stmt) result_proxy.rowcount
stmt = delete(employees).where(employees.columns.id == 3) result_proxy = connection.execute(stmt) result_proxy.rowcount
stmt = delete(employees).where(employees.columns.id == 3)
result_proxy = connection.execute(stmt) result_proxy.rowcount
1
drop()
extra_employees.drop(engine) print(extra_employees.exists(engine))
extra_employees.drop(engine)
print(extra_employees.exists(engine))
False
drop_all()
metadata.drop_all(engine) engine.table_names()
metadata.drop_all(engine)
engine.table_names()
[]
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