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

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Daniel Lee 2017-12-07 10:48:59 +01:00
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commit 5325972aa4
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docs/sources/features/datasources/mysql.md
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@ -146,6 +146,12 @@ the hosts variable only show hosts from the current selected region with a query
SELECT hostname FROM my_host WHERE region IN($region)
```
To use time range dependent macros like `$__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)
```
### Using Variables in Queries
From Grafana 4.3.0 to 4.6.0, template variables are always quoted automatically so if it is a string value do not wrap them in quotes in where clauses.