Ticket #269: Improvements made with regards to the connection history.

extensions/guacamole-auth-mysql/src/main/resources/generatorConfig.xml

@@ -84,6 +84,8 @@
             domainObjectName="ConnectionHistory" >
             <property name="useActualColumnNames" value="true"/>
             <property name="ignoreQualifiersAtRuntime" value="true"/>
+            <generatedKey column="history_id" identity="true"
+                sqlStatement="SELECT LAST_INSERT_ID()"/>
         </table>
 
     </context>