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postgres: pass timerange for template variable queries (#10069)

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* pass timerange for template queries when refresh is set to timerange
change

* document on time range change refresh mode for template queries
This commit is contained in:
Sven Klemm
2017-12-07 10:05:04 +01:00
committed by Daniel Lee
parent c80eadcdf4
commit b44c599410
2 changed files with 18 additions and 3 deletions
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6
docs/sources/features/datasources/postgres.md
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@@ -139,6 +139,12 @@ A query can return multiple columns and Grafana will automatically create a list
SELECT host.hostname, other_host.hostname2 FROM host JOIN other_host ON host.city = other_host.city
```
To use time range dependent macros like `$__timeFilter(column)` in your query the refresh mode of the template variable needs to be set to *On Time Range Change*.
```sql
SELECT event_name FROM event_log WHERE $__timeFilter(time_column)
```
Another option is a query that can create a key/value variable. The query should return two columns that are named `__text` and `__value`. The `__text` column value should be unique (if it is not unique then the first value is used). The options in the dropdown will have a text and value that allows you to have a friendly name as text and an id as the value. An example query with `hostname` as the text and `id` as the value:
```sql