Building web application to get PostGIS query from user and view result map using Geo

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I'm a newbie in web-map application area.

I just found the small application in this tutorial interesting

I am a bit confused, because when i publish a map using geoserver and openlayer, I have to create a layer in geoserver first and this layer is fixed with a table from postgis and then use open layer to call geoserver to render the map.

• How can the tutor of that tutorial change the data source of the layer depending on the query input by the users ?
• It means there are ways to change the data source of one layer on the fly right ?

Please advice me how or can anyone tell me where can I download the code of the app in that tutorial.



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