[OpenLayers-Users] Create Objects from Database

[gabriel]

Hi, 

if you want only read data from database try this:

new layer = new ol.Layer.Vector("vehicle",
                    {
                      strategies: [new o.Strategy.BBOX()],
                      protocol: new o.Protocol.WFS
                      ({
                        url:<url to your mapserver>,
                        featureType:"<name of the table you want to add>",
                        featureNS:"<namespace>",
                        geometryName:"<geometry name, default is the_geom>",
                        version:"1.1.0" // version of WFS 
                      })
                    });

map. addLayer(layer);

Ofcourse, this example works with mapserver (MapServer, Geoserver....)

If you want to add new obects into table you must create saveStrategy object
and add it to layer. 
For example:
 var saveStrategy = new ol.StrategySave();

var layer = new ol.Layer.Vector("name",{
  strategies: [new o.Strategy.BBOX(), saveStrategy],
  ....
});

Then you need to create for example button to save new geometry. 

var button = document.getElementById("button_save");
button.onclick = function() {
 saveStrategy.save();
}

This process will save only geometry into table. If you want to add
attributes too you should do something like this: 

var layer = new ol.Layer.Vector("name", {
 strategies:.....,
 protocol({.....}),
 eventListener:{
  beforefeatureadded:function(e)
  {
   e.feature.attributes.buffer = window.prompt("add buffer value");
  }
 }
}) ;
 thats only example. 
 There is another
:http://openlayers.org/dev/examples/wfs-protocol-transactions.html

Last thing, you need to create draw control, to draw vectors(polygon, point,
line). 
Look this http://openlayers.org/dev/examples/draw-feature.html



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