如何在 django SQLITE 中使用原始 sql 查询执行搜索操作

Question

我正在尝试在 STAT table 的 detection 字段中搜索字符串，如下所示：

query = "select detection_class, stream_id, track_id, detection_time, " \
                    "frame_id" \
                    " FROM stats where  stream_id = %s "\
                    "detection_class like %%s%% group by track_id; "
with connection.cursor() as cursor:
      cursor.execute(query,[stream_id, detection_class])

在这里，当我给出 detection_class 中包含的单词或某些字符时，它 returns 出现这样的错误消息 TypeError('not all arguments converted during string formatting')),。而且，如果我尝试 detection_class=%s 它在给出 while 其他词时可以正常工作 returns None.

Answer 1

执行查询时不要使用字符串格式。而是使用占位符或命名参数。

query = """
SELECT detection_class, 
       stream_id, 
       track_id, 
       detection_time,
       frame_id
FROM stats
WHERE stream_id = :stream_id
AND detection_class LIKE :dclass 
GROUP BY track_id;
"""

with connection.cursor() as cursor:
      params = {"stream_id": stream_id, "dclass": f"%{detection_class}%"}
      cursor.execute(query, params)

我相信也可以使用占位符方法来完成，如下所示。

query = """
SELECT detection_class, 
       stream_id, 
       track_id, 
       detection_time,
       frame_id
FROM stats
WHERE stream_id = ?
AND detection_class LIKE %?%
GROUP BY track_id;
"""

with connection.cursor() as cursor:
      cursor.execute(query, (stream_id, detection_class,))

如何在 django SQLITE 中使用原始 sql 查询执行搜索操作

How can I perform search operation using raw sql query in django SQLITE

python

django

sqlite