How to get the name of a course's teacher - mysql

Question

Could you help me create a query that shows the teacher(s) of a course
Example:
Title of course: Course 1
Teacher: James Anderson
I have this query:
SELECT DISTINCT ldm_user.id,
ldm_user.firstname,
ldm_user.lastname,
ldm_course.shortname,
ldm_course.fullname,
ldm_role.id as role_id,
ldm_role_assignments.id
FROM ldm_course,ldm_user,ldm_role,ldm_context,ldm_role_assignments
WHERE ldm_course.fullname = "i-ONS001 Taller de Lectura y Redacción IV" and ldm_role_assignments.id = 4
But this is not returning the name of the teacher as expected.

Answer 1

This one is a little old, but I had to spend some time trying to figure it out and thought I would share what I came up with.
The basic PHP below will get the list of users enrolled in the course, comb through them and find any with the "editingteacher" role.
$moodle_site = 'YOUR_MOODLE_URL';
$moodle_token = 'YOUR_MOODLE_TOKEN';
$courseid = 7; // Enter the Moodle course ID you want to find the teacher for
$restformat = 'json';
$params = '';
$functionname = 'core_enrol_get_enrolled_users'; // Make sure function is enabled in Moodle
$serverurl = $moodle_site . '/webservice/rest/server.php' . '?wstoken=' . $moodle_token . '&wsfunction=' . $functionname . '&courseid='.$courseid;
$curl = new curl;
$restformat = ($restformat == 'json') ? '&moodlewsrestformat=' . $restformat : '';
$resp = $curl->post($serverurl . $restformat, $params);
$get_result = json_decode($resp, true);
if (!empty($resp)) {
foreach ($get_result as $array_level1) {
foreach ($array_level1["roles"] as $array_level2) {
if ($array_level2["shortname"]=='editingteacher') {
echo 'Teacher ID: '.$array_level1["id"].'<br>';
echo 'Teacher Name: '.$array_level1["firstname"].' '.$array_level1["lastname"].'<br>';
echo 'Teacher Email: '.$array_level1["email"].'<br>';
}
}
}
} else {
echo 'No users were returned.<br>';
}

Answer 2

Your question is incomplete, because the exact query will vary depending on your version of Moodle, whether you're using SQL or MySQL, and also we can't give you a comprehensive answer without knowing your table structures.
However, in Moodle 2.x you can use an API query (PHP) which looks something like this:
$role = $DB->get_record('role', array('shortname' => 'editingteacher'));
$context = get_context_instance(CONTEXT_COURSE, $courseid);
$teachers = get_role_users($role->id, $context);
and then doing a return $teachers; or echo $teachers; to output said results.
Like I said, without knowing your exact system details I can't give you an accurate response and a functioning query so take that with a pinch of salt; you might need to play around with it to get it to work.
Ref: https://moodle.org/mod/forum/discuss.php?d=115636