how to insert form data into database in moodle - database

Question

I have created a simple form in the NEWMODULE plugin and a database table to save form data, but i don't know how to insert the form data into the database. I save the code into my_form.php, this is my code:
class myform_form extends moodleform {
public function definition() {
global $DB,$CFG;
$mform = &$this->_form;
$mform->addElement('text', 'tendethi', get_string('tendethi', 'myform'));
$mform->setType('tendethi', PARAM_TEXT);
$mform->setDefault('tendethi','Nhập tên đề thi');
$mform->addElement('text', 'mdt', get_string('madethi','myform'));
$mform->setType('mdt', PARAM_TEXT);
$mform->setDefault('mdt','Nhập mã đề thi');
$mform->addElement('duration', 'timelimit', get_string('thoigianlambai','myform'));
$mform->setType('timelimit', PARAM_TEXT);
$mform->addElement('text', 'gvrd', get_string('giaovienrade','myform'));
$mform->setType('gvrd', PARAM_TEXT);
$mform->setDefault('gvrd','Nhập họ tên giáo viên ra đề thi');
$mform->addElement('text', 'tmh', get_string('tenmonhoc','myform'));
$mform->setType('tmh', PARAM_TEXT);
$mform->setDefault('tmh','Nhập tên môn học');
$buttonarray=array();
$buttonarray[] = &$mform->createElement('submit', 'submitbutton', get_string('savechanges'));
$buttonarray[] = &$mform->createElement('reset', 'resetbutton', get_string('revert'));
$buttonarray[] = &$mform->createElement('cancel');
$mform->addGroup($buttonarray, 'buttonar', '', array(' '), false);
$mform->closeHeaderBefore('buttonar');
and this is code insert form data into database :
// insert database into table
//global $DB;
$tendethi = optional_param('tendethi', null, PARAM_TEXT);
$mdt = optional_param('mdt', null, PARAM_INT);
$timelimit = optional_param('timelimit', null, PARAM_INT);
$gvrd = optional_param('gvrd', null, PARAM_TEXT);
$tmh = optional_param('tmh', null, PARAM_TEXT);
if($data = $mform->get_data()){
$record = new stdClass();
$record->tendethi = $tendethi ;
$record->mdt = $mdt ;
$record->timelimit = $timelimit ;
$record->gvrd = $gvrd ;
$record->tmh = $tmh ;
$DB=insert_record('myform_form', $record, false);
}
please help me !

Answer 1

Your code should look roughly like this:
$urlaftersubmission = new moodle_url(); // You will need to fill this in.
$form = new myform_form();
if ($form->is_cancelled()) {
redirect($urlaftersubmission);
}
if ($data = $form->get_data()) {
$DB->insert_record('name_of_table', $data);
redirect($urlaftersubmission);
}
echo $OUTPUT->header();
$form->display();
echo $OUTPUT->footer();
Note, you may have to adjust the data slightly for it to be in the correct format for inserting in the database. You should also make sure that you create your database table using the install.xml or upgrade.php files in your plugin (and use the Moodle built-in xmldb editor to generate those files correctly), otherwise Moodle will not recognise them for inserting data.