全文搜索中的 Google App Engine 偏移量大于 1000 导致错误

Question

我正在使用 GAE 搜索 API 来执行文本搜索，现在的问题是我可以获得最大 2000（偏移量 = 1000 和限制 = 2000）的结果，而我的数据非常大。那么我应该怎么做才能得到超过 2000 个结果呢？

Answer 1

使用搜索 API 并为您的查询构建全文搜索索引。例如，我的代码如下所示并搜索索引：

def find_documents(query_string, limit, cursor):
    try:
        date_desc = search.SortExpression(expression='date',
                direction=search.SortExpression.DESCENDING,
                default_value=datetime(1999,01,01))

        hr_desc = search.SortExpression(expression='hour',
                direction=search.SortExpression.DESCENDING,
                default_value=1)

        min_desc = search.SortExpression(expression='minute',
                direction=search.SortExpression.DESCENDING,
                default_value=1)

        # Sort up to  matching results by subject in descending order
        sort = search.SortOptions(expressions=[date_desc, hr_desc,
                                  min_desc], limit=ACCURACY)

        # Set query options
        options = search.QueryOptions(limit=50, cursor=cursor,
                sort_options=sort,
                number_found_accuracy=10000,
              #  returned_fields=['title', 'city', 'region','category', 'adID', 'date','price', 'type', 'company_ad', 'adID', 'cityID','regionID', 'hour','minute'],
             #snippeted_fields=['text']
              )
        query = search.Query(query_string=query_string, options=options)
        index = search.Index(name=_INDEX_NAME)
        logging.debug('query_string i find %s' , str(query.query_string))
        logging.debug('query_options i find %s' , str(query.options))
        # Execute the query
        return index.search(query)

    except search.PutError as e:
        logging.exception('caught PutError %s', e)

    except search.InternalError as e:
        logging.exception('caught InternalError %s', e)

    except search.DeleteError as e:
        logging.exception('caught DeleteError %s', e)

    except search.TransientError as e:
        logging.exception('caught TransientError %s', e)

    except search.InvalidRequest as e:
        logging.exception('caught InvalidError %s', e)

    except search.Error as e:
        logging.exception('caught unknown error  %s', e)

    return None

对于分页，您可以使用可以分页大型数据集的游标。还有更多信息here。