0

我在由 MySql DataSource 支持的 Grafana 中有以下查询。

SELECT
  $__timeGroupAlias(ts,$__interval),
  sum(total) AS "total"
FROM hp
WHERE
  $__timeFilter(ts) 
  AND customer_type IN ($CustomerType) AND age IN ($age) AND gender IN ($gender)
GROUP BY 1
ORDER BY $__timeGroup(ts,$__interval)

Dashboard 中有多个 singleStat/panel/graphs，它们使用不同的选择参数，但 WHERE 条件在所有这些中保持相同。

我想将条件保留为单独的常量变量，以便我可以在每个查询中仅添加该变量。

我试图像这样构建我的查询。

SELECT
  $__timeGroupAlias(ts,$__interval),
  sum(total) AS "total"
FROM hp
$where_condition
GROUP BY 1
ORDER BY $__timeGroup(ts,$__interval)

并声明where_condition为WHERE $__timeFilter(ts) AND customer_type IN ($CustomerType) AND age IN ($age) AND gender IN ($gender).

但是查询失败，因为内部变量（$CustomerType,$age,$gender）没有被查询生成器解析，生成的查询看起来像这样。

SELECT
  UNIX_TIMESTAMP(ts) DIV 900 * 900 AS "time",
  sum(total) AS "total"
FROM hp
ts BETWEEN FROM_UNIXTIME(1548311714) AND FROM_UNIXTIME(1548398114) 
AND customer_type IN ($CustomerType) AND age IN ($age) AND gender IN ($gender)
GROUP BY 1
ORDER BY UNIX_TIMESTAMP(ts) DIV 900 * 900

有没有办法解决其他变量中包含的变量。或者有没有其他方法可以将包含变量的查询部分外部化？

4

2 回答 2

1

constant变量类型只生成静态字符串。它没有替代任何变量。切换到querytype 并使用 MySQL 返回字符串，这将为您的where_condition变量提供准确的字符串值。询问：

SELECT 'WHERE $__timeFilter(ts) AND customer_type IN ($CustomerType) AND age IN ($age) AND gender IN ($gender)'

恕我直言：变量替换也适用于constant类型。您可以打开该https://github.com/grafana/grafana/issues的功能请求。

于 2019-01-25T08:11:29.300 回答
0

我也遇到了引号问题，这是我支持“全部”和许多选择的解决方案：

SELECT '
task_run_table.is_system = false 
AND 
(
    ''__all__'' = ''${user:raw}''
    OR 
    task_run_table.user  = any ( string_to_array(''${user:raw}'', '','')::text[])
)
AND 
(
    ''__all__'' = ''${job:raw}''
    OR 
    task_run_table.job_name  = any ( string_to_array(''${job:raw}'', '','')::text[])
)
'

All值被覆盖为__all__。它是这样使用的：

SELECT 
  $__timeGroup(task_run_table.start_time, '$interval', NULL),
  task_run_table.name AS metric,
  COUNT(*) AS value
FROM
  task_run_table
WHERE 
  $__timeFilter(task_run_table.start_time) 
  AND 
  ${default_filter:raw}
  AND 
  task_run_table.state = $state
GROUP BY time, task_run_table.name
ORDER BY time, value DESC
于 2020-11-24T15:59:10.067 回答