still error

          st=con.createStatement();
            int a=Integer.parseInt(txttrno.getText());
            String b=txttname.getText();
            String c=txtfrom.getText();
            String d=txtto.getText();
            String k=txtname.getText();
            String f=txtgen.getText();
            String g=txtadd.getText();
            int h=Integer.parseInt(txtphone.getText());
           rs=st.executeUpdate("insert into railway values("+a+",'"+b+"','"+c+"','"+d+"','"+e+"','"+f+"','"+g+"',"+h+")");
        }

con.close(); st.close(); rs.close(); }

wts wrong with above code?