与 SQL 线作斗争

Question

我正在为类似 SQL 的行苦苦挣扎，我只是不知道如何解决它。

query = "SELECT P_askbid_midprice1, Label1 FROM 'DCIX_OB' WHERE time >= '2018-02-16T09:00:00Z' and time <= '2018-02-16T16:00:00' "

上一行出现以下错误：

Traceback (most recent call last):
  File "graph_influxdb.py", line 53, in <module>
    read_data(length='5min')
  File "graph_influxdb.py", line 29, in read_data
    result = client.query(query)
  File "/usr/local/lib/python3.6/dist-packages/influxdb/client.py", line 394, in query
    expected_response_code=expected_response_code
  File "/usr/local/lib/python3.6/dist-packages/influxdb/client.py", line 271, in request
    raise InfluxDBClientError(response.content, response.status_code)
influxdb.exceptions.InfluxDBClientError: 400: {"error":"error parsing query: found DCIX_OB, expected identifier at line 1, char 39"}

我该如何解决这个问题？

Answer 1

Single quote string values (for example, tag values) but do not single quote identifiers (database names, retention policy names, user names, measurement names, tag keys, and field keys).

如果它们以数字开头，包含 [A-z,0-9,_] 以外的字符，或者它们是 InfluxQL 关键字，则使用双引号标识符。如果标识符不属于这些类别之一，则不需要双引号，但我们还是建议使用双引号。

即使用FROM "DCIX_OB"（FROM DCIX_OB 也是合法的，但不推荐）。