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Update README #439

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20 changes: 20 additions & 0 deletions README.md
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Expand Up @@ -175,6 +175,26 @@ The following tokens are supported in custom SQL queries for the PostGIS data pr
- `!ZOOM!` - [optional] Pass in the zoom value for the request. Useful for filtering feature results by zoom.

## Environment Variables

#### Config TOML
Environment variables can be injected into the configuration file. One caveat is that the injection has to be within a string, though the value it represents does not have to be a string.

The above config example could be written as:
```toml
# register data providers
[[providers]]
name = "test_postgis"
type = "postgis"
host = "${POSTGIS_HOST}" # postgis database host (required)
port = "${POSTGIS_PORT}" # recall this value must be an int
database = "${POSTGIS_DB}"
user = "tegola"
password = ""
srid = 3857
max_connections = "${POSTGIS_MAX_CONN}"
```

#### SQL Debugging
The following environment variables can be used for debugging:

`SQL_DEBUG` specify the type of SQL debug information to output. Currently support two values:
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