/**
* Deletes question and all associated data from the database
*
* It will not delete a question if it is used by an activity module
* @param object $question The question being deleted
*/
function delete_question($questionid)
{
global $QTYPES;
if (!($question = get_record('question', 'id', $questionid))) {
// In some situations, for example if this was a child of a
// Cloze question that was previously deleted, the question may already
// have gone. In this case, just do nothing.
return;
}
// Do not delete a question if it is used by an activity module
if (count(question_list_instances($questionid))) {
return;
}
// delete questiontype-specific data
question_require_capability_on($question, 'edit');
if ($question) {
if (isset($QTYPES[$question->qtype])) {
$QTYPES[$question->qtype]->delete_question($questionid);
}
} else {
echo "Question with id {$questionid} does not exist.<br />";
}
if ($states = get_records('question_states', 'question', $questionid)) {
$stateslist = implode(',', array_keys($states));
// delete questiontype-specific data
foreach ($QTYPES as $qtype) {
$qtype->delete_states($stateslist);
}
}
// delete entries from all other question tables
// It is important that this is done only after calling the questiontype functions
delete_records("question_answers", "question", $questionid);
delete_records("question_states", "question", $questionid);
delete_records("question_sessions", "questionid", $questionid);
// Now recursively delete all child questions
if ($children = get_records('question', 'parent', $questionid)) {
foreach ($children as $child) {
if ($child->id != $questionid) {
delete_question($child->id);
}
}
}
// Finally delete the question record itself
delete_records('question', 'id', $questionid);
return;
}
function RWSIQCUsed($r_qci)
{
global $DB;
global $CFG;
$r_chn = $DB->get_records("question_categories", array("parent" => $r_qci));
if (count($r_chn) > 0) {
foreach ($r_chn as $r_chd) {
if (RWSIQCUsed($r_chd->id)) {
return true;
}
}
}
$r_qsts = $DB->get_records("question", array("category" => $r_qci));
if (count($r_qsts) > 0) {
if (respondusws_floatcompare($CFG->version, 2011070100, 2) >= 0) {
$r_qis = array();
foreach ($r_qsts as $r_q) {
$r_qis[] = $r_q->id;
}
if (questions_in_use($r_qis)) {
return true;
}
} else {
foreach ($r_qsts as $r_q) {
if (count(question_list_instances($r_q->id)) > 0) {
return true;
}
}
}
}
return false;
}
/**
* Deletes question and all associated data from the database
*
* It will not delete a question if it is used by an activity module
*
* @global object
* @global object
* @param object $question The question being deleted
*/
function delete_question($questionid)
{
global $QTYPES, $DB;
$question = $DB->get_record_sql('
SELECT q.*, qc.contextid
FROM {question} q
JOIN {question_categories} qc ON qc.id = q.category
WHERE q.id = ?', array($questionid));
if (!$question) {
// In some situations, for example if this was a child of a
// Cloze question that was previously deleted, the question may already
// have gone. In this case, just do nothing.
return;
}
// Do not delete a question if it is used by an activity module
if (count(question_list_instances($questionid))) {
return;
}
// delete questiontype-specific data
question_require_capability_on($question, 'edit');
if (isset($QTYPES[$question->qtype])) {
$QTYPES[$question->qtype]->delete_question($questionid, $question->contextid);
}
if ($states = $DB->get_records('question_states', array('question' => $questionid))) {
$stateslist = implode(',', array_keys($states));
// delete questiontype-specific data
foreach ($QTYPES as $qtype) {
$qtype->delete_states($stateslist);
}
}
// Delete entries from all other question tables
// It is important that this is done only after calling the questiontype functions
$DB->delete_records('question_answers', array('question' => $questionid));
$DB->delete_records('question_states', array('question' => $questionid));
$DB->delete_records('question_sessions', array('questionid' => $questionid));
// Now recursively delete all child questions
if ($children = $DB->get_records('question', array('parent' => $questionid), '', 'id,qtype')) {
foreach ($children as $child) {
if ($child->id != $questionid) {
delete_question($child->id);
}
}
}
// Finally delete the question record itself
$DB->delete_records('question', array('id' => $questionid));
}
/**
* Deletes question and all associated data from the database
*
* It will not delete a question if it is used by an activity module
* @param object $question The question being deleted
*/
function delete_question($questionid)
{
global $QTYPES;
// Do not delete a question if it is used by an activity module
if (count(question_list_instances($questionid))) {
return;
}
// delete questiontype-specific data
if ($question = get_record('question', 'id', $questionid)) {
if (isset($QTYPES[$question->qtype])) {
$QTYPES[$question->qtype]->delete_question($questionid);
}
} else {
echo "Question with id {$questionid} does not exist.<br />";
}
if ($states = get_records('question_states', 'question', $questionid)) {
$stateslist = implode(',', array_keys($states));
// delete questiontype-specific data
foreach ($QTYPES as $qtype) {
$qtype->delete_states($stateslist);
}
}
// delete entries from all other question tables
// It is important that this is done only after calling the questiontype functions
delete_records("question_answers", "question", $questionid);
delete_records("question_states", "question", $questionid);
delete_records("question_sessions", "questionid", $questionid);
// Now recursively delete all child questions
if ($children = get_records('question', 'parent', $questionid)) {
foreach ($children as $child) {
if ($child->id != $questionid) {
delete_question($child->id);
}
}
}
// Finally delete the question record itself
delete_records('question', 'id', $questionid);
return;
}
