Question

我试图在psycopg2中使用IN语句。我传递了一个元组，但是我的一个项目是一个包含单引号的字符串（例如：l＆＃39; Enfant Plaza）。

将其转换为元组时，Python会自动添加双引号（例如：＆＃39; Union Station＆＃39;，＆＃34; l＆＃39; Enfant Plaza＆＃34;，＆＃39; Dupont Cir＆＃ 39））

因此，当我执行SQL查询时，我收到一个错误：

dataframe = pd.read_sql("""SELECT * FROM trips
                                WHERE originlocation IN {}
                            """.format(origin_locations_tuple), connection)


ERROR: column "l'Enfant Plaza" does not exist

Answer 1

Clodoaldo的建议让我走上正轨。使用pandas查询参数解决了它。工作版本如下所示：

sql = """SELECT * FROM final_trips_prod
                            WHERE (dateoftrip + origintime)
                                BETWEEN (TIMESTAMP %(datetime_selected)s - INTERVAL '3 HOURS')
                                AND (TIMESTAMP %(datetime_selected)s + INTERVAL '3 HOUR')
                            AND originlocation IN %(origin_locations)s
                            AND destinationlocation IN %(destination_locations)s
    """
dataframe = pd.read_sql_query(sql = sql,
                              con = connection,
                              params = {
                                  'datetime_selected': datetime_selected,
                                  'origin_locations': origin_locations,
                                  'destination_locations': destination_locations})

使用带有元组的Pandas for IN语句时单击引号

1 个答案: