如果输入不正确，不允许用户在mysql数据库中保存数据。

Hi I am doing project in Spring Roo. Where can I put restrictions that the phone number must be 10 digits? I have already put restrictions in create.jspx and in User_Roo_DbManaged.aj but it doesn't work. it accepts letters and shorter input.Hi I am doing project in Spring Roo. Where can