How to save text value as integer?

HI,

Does anyone know how to save the text field value as integer?
I have a problem with my ‘price’ field which exist as text in CFT admin and when i am trying to search for values (price) it doesn’t show the right results.

Hope someone can help
Cheers,

http://ww.wp.xz.cn/extend/plugins/custom-field-template/