[OpenLayers-Users] Save polyline drawn in to database

[truongpm]

Hello, 
I want to create function that draw a polyline in to new feature class of
map and save this line in to database.
My ideal is similar with this tutorial.
http://dev.openlayers.org/releases/OpenLayers-2.8/examples/vector-formats.html

It will generate data at KML format and can use it to save to database.
I have some question:
1. In above example, the KML string generate when select line which just
draw. How could I change it to automatically when draw line?
2. Is there any other ideal about how to draw polyline and save it into
database (postgres or mysql)?
3. How to edit polyline which display from database?

Thank for your attention and sorry about my language skill. 
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