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mysql: pass timerange for template variable queries (#10071)

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* mysql: pass timerange for template variable queries

* mysql: document time range macro usage in template variables

* mysql: docs for on time range change refresh mode for template queries

* Revert "mysql: docs for on time range change refresh mode for template queries"

This reverts commit 5325972aa4.
This commit is contained in:
Sven Klemm
2017-12-07 11:18:36 +01:00
committed by Daniel Lee
parent b44c599410
commit a62ebb3e59
2 changed files with 18 additions and 3 deletions
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6
docs/sources/features/datasources/mysql.md
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@@ -127,6 +127,12 @@ A query can returns multiple columns and Grafana will automatically create a lis
SELECT my_host.hostname, my_other_host.hostname2 FROM my_host JOIN my_other_host ON my_host.city = my_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