Question

我有一个从psql数据库中删除行的功能

def delete_from_database():
    engine = connect_to_database()
    # define meta information
    metadata = MetaData(bind=engine)
    session = sessionmaker(bind=engine)()
    country_table = Table('countries', metadata, autoload=True)
    # delete
    delete_country_query = country_table.delete(country_table.c.id == 14)
    session.execute(delete_country_query)
    session.commit()

我可以参数化表名，但我也想参数化要搜索的键值对然后删除。在上面的示例中country_table.c.id其中id是表中的列，但我想概括列名

Answer 1

由于Table.c是一个集合，它应该是：

def delete_from_database(table_name, column_name, value):
  engine = connect_to_database()
  # define meta information
  metadata = MetaData(bind=engine)
  session = sessionmaker(bind=engine)()
  country_table = Table(table_name, metadata, autoload=True)
  # delete
  delete_country_query = country_table.delete(country_table.c[column_name] == value)
  session.execute(delete_country_query)
  session.commit()

请参阅here

参数化删除函数sqlalchemy

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