InfluxDB 占位符 "Empty bound parameter"

Question

我正在努力使用占位符格式化 InfluxDB 查询。

这里我用多个占位符查询。这些值在占位符对象中定义，如下所示，

let query = `SELECT grid_ref_x, grid_ref_y, label FROM position
WHERE "label" = $<label> and time >= $<from> - $<interval>`;

const placeholders = {label: 'person', from: 'now()', interval: '5m'};
const resp = await influx.query(query, { placeholders });

发送后，error 400 - error parsing query: empty bound parameter

在错误中我可以看到 GET 请求，Influx 库似乎已正确格式化“params”下的占位符。

/query?p=root&u=root&db=heatmap&epoch=&q=SELECT grid_ref_x, grid_ref_y, label FROM position WHERE label = $<label> and time >= $<from> - $<interval>&rp=&params={"from":"now()","interval":"5h","label":"person"}

如何正确设置查询格式？

Answer 1

你尝试过改变

let query = `SELECT grid_ref_x, grid_ref_y, label FROM position
WHERE "label" = $<label> and time >= $<from> - $<interval>`;

到

let query = `SELECT grid_ref_x, grid_ref_y, label FROM position
WHERE "label" = $label and time >= $from - $interval`;

不同之处在于您使用 $variable_name 而不是 $[= 来引用占位符或绑定参数23=]。假设您使用的是 node_influx，您可以删除标签上的双引号，它仍然有效。

我用这个PR作为参考https://github.com/node-influx/node-influx/issues/587

InfluxDB 占位符 "Empty bound parameter"

InfluxDB placeholder "Empty bound parameter"

sql

node.js

get

influxdb

sqlbindparameter