Edit

// Edit Data
        try {
            String sql ="UPDATE mhs SET nama = '"+txtnama.getText()+"', nim = '"+txtnim.getText()+"', jurusan = '"+jComboBox1.getSelectedItem()+"',alamat= '"+txtalamat.getText()+"',telp= '"+txttelp.getText()+"' WHERE nim = '"+txtnim.getText()+"'";
            java.sql.Connection conn=(Connection)Config.configDB();
            java.sql.PreparedStatement pst=conn.prepareStatement(sql);
            pst.execute();
            JOptionPane.showMessageDialog(null, "data berhasil di edit");
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, "Perubahan Data Gagal"+e.getMessage());
        }
        load_table(); //load isi table
        kosong(); //kosongkan isi text