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README: document DSN system var quoting rules (#405) #502

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README: document DSN system var quoting rules (#405)
dolmen Oct 26, 2016
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dolmen Nov 5, 2016
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20 changes: 14 additions & 6 deletions README.md
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Expand Up @@ -315,13 +315,21 @@ I/O write timeout. The value must be a decimal number with an unit suffix ( *"ms

##### System Variables

All other parameters are interpreted as system variables:
* `autocommit`: `"SET autocommit=<value>"`
* [`time_zone`](https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html): `"SET time_zone=<value>"`
* [`tx_isolation`](https://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html#sysvar_tx_isolation): `"SET tx_isolation=<value>"`
* `param`: `"SET <param>=<value>"`
Any other parameters are interpreted as system variables:
* `<boolean_var>=<value>`: `SET <boolean_var>=<value>`
* `<enum_var>=<value>`: `SET <enum_var>=<value>`
* `<string_var>=%27<value>%27`: `SET <string_var>='<value>'`

Rules:
* The values for string variables must be quoted with '
* The values must also be [url.QueryEscape](http://golang.org/pkg/net/url/#QueryEscape)'ed!
(which implies values of string variables must be wrapped with `%27`)

Examples:
* `autocommit=1`: `SET autocommit=1`
* [`time_zone=%27Europe%2FParis%27`](https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html): `SET time_zone='Europe/Paris'`
* [`tx_isolation=%27REPEATABLE-READ%27`](https://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html#sysvar_tx_isolation): `SET tx_isolation='REPEATABLE-READ'`

*The values must be [url.QueryEscape](http://golang.org/pkg/net/url/#QueryEscape)'ed!*

#### Examples
```
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