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datalib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Library of functions for database manipulation.
*
* Other main libraries:
* - weblib.php - functions that produce web output
* - moodlelib.php - general-purpose Moodle functions
*
* @package core
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* The maximum courses in a category
* MAX_COURSES_IN_CATEGORY * MAX_COURSE_CATEGORIES must not be more than max integer!
*/
define('MAX_COURSES_IN_CATEGORY', 10000);
/**
* The maximum number of course categories
* MAX_COURSES_IN_CATEGORY * MAX_COURSE_CATEGORIES must not be more than max integer!
*/
define('MAX_COURSE_CATEGORIES', 10000);
/**
* Number of seconds to wait before updating lastaccess information in DB.
*/
define('LASTACCESS_UPDATE_SECS', 60);
/**
* Returns $user object of the main admin user
*
* @static stdClass $mainadmin
* @return stdClass {@link $USER} record from DB, false if not found
*/
function get_admin() {
global $CFG, $DB;
static $mainadmin = null;
static $prevadmins = null;
if (empty($CFG->siteadmins)) {
// Should not happen on an ordinary site.
// It does however happen during unit tests.
return false;
}
if (isset($mainadmin) and $prevadmins === $CFG->siteadmins) {
return clone($mainadmin);
}
$mainadmin = null;
foreach (explode(',', $CFG->siteadmins) as $id) {
if ($user = $DB->get_record('user', array('id'=>$id, 'deleted'=>0))) {
$mainadmin = $user;
break;
}
}
if ($mainadmin) {
$prevadmins = $CFG->siteadmins;
return clone($mainadmin);
} else {
// this should not happen
return false;
}
}
/**
* Returns list of all admins, using 1 DB query
*
* @return array
*/
function get_admins() {
global $DB, $CFG;
if (empty($CFG->siteadmins)) { // Should not happen on an ordinary site
return array();
}
$sql = "SELECT u.*
FROM {user} u
WHERE u.deleted = 0 AND u.id IN ($CFG->siteadmins)";
// We want the same order as in $CFG->siteadmins.
$records = $DB->get_records_sql($sql);
$admins = array();
foreach (explode(',', $CFG->siteadmins) as $id) {
$id = (int)$id;
if (!isset($records[$id])) {
// User does not exist, this should not happen.
continue;
}
$admins[$records[$id]->id] = $records[$id];
}
return $admins;
}
/**
* Search through course users
*
* If $coursid specifies the site course then this function searches
* through all undeleted and confirmed users
*
* @global object
* @uses SITEID
* @uses SQL_PARAMS_NAMED
* @uses CONTEXT_COURSE
* @param int $courseid The course in question.
* @param int $groupid The group in question.
* @param string $searchtext The string to search for
* @param string $sort A field to sort by
* @param array $exceptions A list of IDs to ignore, eg 2,4,5,8,9,10
* @return array
*/
function search_users($courseid, $groupid, $searchtext, $sort='', array $exceptions=null) {
global $DB;
$fullname = $DB->sql_fullname('u.firstname', 'u.lastname');
if (!empty($exceptions)) {
list($exceptions, $params) = $DB->get_in_or_equal($exceptions, SQL_PARAMS_NAMED, 'ex', false);
$except = "AND u.id $exceptions";
} else {
$except = "";
$params = array();
}
if (!empty($sort)) {
$order = "ORDER BY $sort";
} else {
$order = "";
}
$select = "u.deleted = 0 AND u.confirmed = 1 AND (".$DB->sql_like($fullname, ':search1', false)." OR ".$DB->sql_like('u.email', ':search2', false).")";
$params['search1'] = "%$searchtext%";
$params['search2'] = "%$searchtext%";
if (!$courseid or $courseid == SITEID) {
$sql = "SELECT u.id, u.firstname, u.lastname, u.email
FROM {user} u
WHERE $select
$except
$order";
return $DB->get_records_sql($sql, $params);
} else {
if ($groupid) {
$sql = "SELECT u.id, u.firstname, u.lastname, u.email
FROM {user} u
JOIN {groups_members} gm ON gm.userid = u.id
WHERE $select AND gm.groupid = :groupid
$except
$order";
$params['groupid'] = $groupid;
return $DB->get_records_sql($sql, $params);
} else {
$context = context_course::instance($courseid);
$contextlists = get_related_contexts_string($context);
$sql = "SELECT u.id, u.firstname, u.lastname, u.email
FROM {user} u
JOIN {role_assignments} ra ON ra.userid = u.id
WHERE $select AND ra.contextid $contextlists
$except
$order";
return $DB->get_records_sql($sql, $params);
}
}
}
/**
* Returns SQL used to search through user table to find users (in a query
* which may also join and apply other conditions).
*
* You can combine this SQL with an existing query by adding 'AND $sql' to the
* WHERE clause of your query (where $sql is the first element in the array
* returned by this function), and merging in the $params array to the parameters
* of your query (where $params is the second element). Your query should use
* named parameters such as :param, rather than the question mark style.
*
* There are examples of basic usage in the unit test for this function.
*
* @param string $search the text to search for (empty string = find all)
* @param string $u the table alias for the user table in the query being
* built. May be ''.
* @param bool $searchanywhere If true (default), searches in the middle of
* names, otherwise only searches at start
* @param array $extrafields Array of extra user fields to include in search
* @param array $exclude Array of user ids to exclude (empty = don't exclude)
* @param array $includeonly If specified, only returns users that have ids
* incldued in this array (empty = don't restrict)
* @return array an array with two elements, a fragment of SQL to go in the
* where clause the query, and an associative array containing any required
* parameters (using named placeholders).
*/
function users_search_sql($search, $u = 'u', $searchanywhere = true, array $extrafields = array(),
array $exclude = null, array $includeonly = null) {
global $DB, $CFG;
$params = array();
$tests = array();
if ($u) {
$u .= '.';
}
// If we have a $search string, put a field LIKE '$search%' condition on each field.
if ($search) {
$conditions = array(
$DB->sql_fullname($u . 'firstname', $u . 'lastname'),
$conditions[] = $u . 'lastname'
);
foreach ($extrafields as $field) {
$conditions[] = $u . $field;
}
if ($searchanywhere) {
$searchparam = '%' . $search . '%';
} else {
$searchparam = $search . '%';
}
$i = 0;
foreach ($conditions as $key => $condition) {
$conditions[$key] = $DB->sql_like($condition, ":con{$i}00", false, false);
$params["con{$i}00"] = $searchparam;
$i++;
}
$tests[] = '(' . implode(' OR ', $conditions) . ')';
}
// Add some additional sensible conditions.
$tests[] = $u . "id <> :guestid";
$params['guestid'] = $CFG->siteguest;
$tests[] = $u . 'deleted = 0';
$tests[] = $u . 'confirmed = 1';
// If we are being asked to exclude any users, do that.
if (!empty($exclude)) {
list($usertest, $userparams) = $DB->get_in_or_equal($exclude, SQL_PARAMS_NAMED, 'ex', false);
$tests[] = $u . 'id ' . $usertest;
$params = array_merge($params, $userparams);
}
// If we are validating a set list of userids, add an id IN (...) test.
if (!empty($includeonly)) {
list($usertest, $userparams) = $DB->get_in_or_equal($includeonly, SQL_PARAMS_NAMED, 'val');
$tests[] = $u . 'id ' . $usertest;
$params = array_merge($params, $userparams);
}
// In case there are no tests, add one result (this makes it easier to combine
// this with an existing query as you can always add AND $sql).
if (empty($tests)) {
$tests[] = '1 = 1';
}
// Combing the conditions and return.
return array(implode(' AND ', $tests), $params);
}
/**
* This function generates the standard ORDER BY clause for use when generating
* lists of users. If you don't have a reason to use a different order, then
* you should use this method to generate the order when displaying lists of users.
*
* If the optional $search parameter is passed, then exact matches to the search
* will be sorted first. For example, suppose you have two users 'Al Zebra' and
* 'Alan Aardvark'. The default sort is Alan, then Al. If, however, you search for
* 'Al', then Al will be listed first. (With two users, this is not a big deal,
* but with thousands of users, it is essential.)
*
* The list of fields scanned for exact matches are:
* - firstname
* - lastname
* - $DB->sql_fullname
* - those returned by get_extra_user_fields
*
* If named parameters are used (which is the default, and highly recommended),
* then the parameter names are like :usersortexactN, where N is an int.
*
* The simplest possible example use is:
* list($sort, $params) = users_order_by_sql();
* $sql = 'SELECT * FROM {users} ORDER BY ' . $sort;
*
* A more complex example, showing that this sort can be combined with other sorts:
* list($sort, $sortparams) = users_order_by_sql('u');
* $sql = "SELECT g.id AS groupid, gg.groupingid, u.id AS userid, u.firstname, u.lastname, u.idnumber, u.username
* FROM {groups} g
* LEFT JOIN {groupings_groups} gg ON g.id = gg.groupid
* LEFT JOIN {groups_members} gm ON g.id = gm.groupid
* LEFT JOIN {user} u ON gm.userid = u.id
* WHERE g.courseid = :courseid $groupwhere $groupingwhere
* ORDER BY g.name, $sort";
* $params += $sortparams;
*
* An example showing the use of $search:
* list($sort, $sortparams) = users_order_by_sql('u', $search, $this->get_context());
* $order = ' ORDER BY ' . $sort;
* $params += $sortparams;
* $availableusers = $DB->get_records_sql($fields . $sql . $order, $params, $page*$perpage, $perpage);
*
* @param string $usertablealias (optional) any table prefix for the {users} table. E.g. 'u'.
* @param string $search (optional) a current search string. If given,
* any exact matches to this string will be sorted first.
* @param context $context the context we are in. Use by get_extra_user_fields.
* Defaults to $PAGE->context.
* @return array with two elements:
* string SQL fragment to use in the ORDER BY clause. For example, "firstname, lastname".
* array of parameters used in the SQL fragment.
*/
function users_order_by_sql($usertablealias = '', $search = null, context $context = null) {
global $DB, $PAGE;
if ($usertablealias) {
$tableprefix = $usertablealias . '.';
} else {
$tableprefix = '';
}
$sort = "{$tableprefix}lastname, {$tableprefix}firstname, {$tableprefix}id";
$params = array();
if (!$search) {
return array($sort, $params);
}
if (!$context) {
$context = $PAGE->context;
}
$exactconditions = array();
$paramkey = 'usersortexact1';
$exactconditions[] = $DB->sql_fullname($tableprefix . 'firstname', $tableprefix . 'lastname') .
' = :' . $paramkey;
$params[$paramkey] = $search;
$paramkey++;
$fieldstocheck = array_merge(array('firstname', 'lastname'), get_extra_user_fields($context));
foreach ($fieldstocheck as $key => $field) {
$exactconditions[] = 'LOWER(' . $tableprefix . $field . ') = LOWER(:' . $paramkey . ')';
$params[$paramkey] = $search;
$paramkey++;
}
$sort = 'CASE WHEN ' . implode(' OR ', $exactconditions) .
' THEN 0 ELSE 1 END, ' . $sort;
return array($sort, $params);
}
/**
* Returns a subset of users
*
* @global object
* @uses DEBUG_DEVELOPER
* @uses SQL_PARAMS_NAMED
* @param bool $get If false then only a count of the records is returned
* @param string $search A simple string to search for
* @param bool $confirmed A switch to allow/disallow unconfirmed users
* @param array $exceptions A list of IDs to ignore, eg 2,4,5,8,9,10
* @param string $sort A SQL snippet for the sorting criteria to use
* @param string $firstinitial Users whose first name starts with $firstinitial
* @param string $lastinitial Users whose last name starts with $lastinitial
* @param string $page The page or records to return
* @param string $recordsperpage The number of records to return per page
* @param string $fields A comma separated list of fields to be returned from the chosen table.
* @return array|int|bool {@link $USER} records unless get is false in which case the integer count of the records found is returned.
* False is returned if an error is encountered.
*/
function get_users($get=true, $search='', $confirmed=false, array $exceptions=null, $sort='firstname ASC',
$firstinitial='', $lastinitial='', $page='', $recordsperpage='', $fields='*', $extraselect='', array $extraparams=null) {
global $DB, $CFG;
if ($get && !$recordsperpage) {
debugging('Call to get_users with $get = true no $recordsperpage limit. ' .
'On large installations, this will probably cause an out of memory error. ' .
'Please think again and change your code so that it does not try to ' .
'load so much data into memory.', DEBUG_DEVELOPER);
}
$fullname = $DB->sql_fullname();
$select = " id <> :guestid AND deleted = 0";
$params = array('guestid'=>$CFG->siteguest);
if (!empty($search)){
$search = trim($search);
$select .= " AND (".$DB->sql_like($fullname, ':search1', false)." OR ".$DB->sql_like('email', ':search2', false)." OR username = :search3)";
$params['search1'] = "%$search%";
$params['search2'] = "%$search%";
$params['search3'] = "$search";
}
if ($confirmed) {
$select .= " AND confirmed = 1";
}
if ($exceptions) {
list($exceptions, $eparams) = $DB->get_in_or_equal($exceptions, SQL_PARAMS_NAMED, 'ex', false);
$params = $params + $eparams;
$select .= " AND id $exceptions";
}
if ($firstinitial) {
$select .= " AND ".$DB->sql_like('firstname', ':fni', false, false);
$params['fni'] = "$firstinitial%";
}
if ($lastinitial) {
$select .= " AND ".$DB->sql_like('lastname', ':lni', false, false);
$params['lni'] = "$lastinitial%";
}
if ($extraselect) {
$select .= " AND $extraselect";
$params = $params + (array)$extraparams;
}
if ($get) {
return $DB->get_records_select('user', $select, $params, $sort, $fields, $page, $recordsperpage);
} else {
return $DB->count_records_select('user', $select, $params);
}
}
/**
* Return filtered (if provided) list of users in site, except guest and deleted users.
*
* @param string $sort An SQL field to sort by
* @param string $dir The sort direction ASC|DESC
* @param int $page The page or records to return
* @param int $recordsperpage The number of records to return per page
* @param string $search A simple string to search for
* @param string $firstinitial Users whose first name starts with $firstinitial
* @param string $lastinitial Users whose last name starts with $lastinitial
* @param string $extraselect An additional SQL select statement to append to the query
* @param array $extraparams Additional parameters to use for the above $extraselect
* @param stdClass $extracontext If specified, will include user 'extra fields'
* as appropriate for current user and given context
* @return array Array of {@link $USER} records
*/
function get_users_listing($sort='lastaccess', $dir='ASC', $page=0, $recordsperpage=0,
$search='', $firstinitial='', $lastinitial='', $extraselect='',
array $extraparams=null, $extracontext = null) {
global $DB, $CFG;
$fullname = $DB->sql_fullname();
$select = "deleted <> 1 AND id <> :guestid";
$params = array('guestid' => $CFG->siteguest);
if (!empty($search)) {
$search = trim($search);
$select .= " AND (". $DB->sql_like($fullname, ':search1', false, false).
" OR ". $DB->sql_like('email', ':search2', false, false).
" OR username = :search3)";
$params['search1'] = "%$search%";
$params['search2'] = "%$search%";
$params['search3'] = "$search";
}
if ($firstinitial) {
$select .= " AND ". $DB->sql_like('firstname', ':fni', false, false);
$params['fni'] = "$firstinitial%";
}
if ($lastinitial) {
$select .= " AND ". $DB->sql_like('lastname', ':lni', false, false);
$params['lni'] = "$lastinitial%";
}
if ($extraselect) {
$select .= " AND $extraselect";
$params = $params + (array)$extraparams;
}
if ($sort) {
$sort = " ORDER BY $sort $dir";
}
// If a context is specified, get extra user fields that the current user
// is supposed to see.
$extrafields = '';
if ($extracontext) {
$extrafields = get_extra_user_fields_sql($extracontext, '', '',
array('id', 'username', 'email', 'firstname', 'lastname', 'city', 'country',
'lastaccess', 'confirmed', 'mnethostid'));
}
// warning: will return UNCONFIRMED USERS
return $DB->get_records_sql("SELECT id, username, email, firstname, lastname, city, country,
lastaccess, confirmed, mnethostid, suspended $extrafields
FROM {user}
WHERE $select
$sort", $params, $page, $recordsperpage);
}
/**
* Full list of users that have confirmed their accounts.
*
* @global object
* @return array of unconfirmed users
*/
function get_users_confirmed() {
global $DB, $CFG;
return $DB->get_records_sql("SELECT *
FROM {user}
WHERE confirmed = 1 AND deleted = 0 AND id <> ?", array($CFG->siteguest));
}
/// OTHER SITE AND COURSE FUNCTIONS /////////////////////////////////////////////
/**
* Returns $course object of the top-level site.
*
* @return object A {@link $COURSE} object for the site, exception if not found
*/
function get_site() {
global $SITE, $DB;
if (!empty($SITE->id)) { // We already have a global to use, so return that
return $SITE;
}
if ($course = $DB->get_record('course', array('category'=>0))) {
return $course;
} else {
// course table exists, but the site is not there,
// unfortunately there is no automatic way to recover
throw new moodle_exception('nosite', 'error');
}
}
/**
* Returns list of courses, for whole site, or category
*
* Returns list of courses, for whole site, or category
* Important: Using c.* for fields is extremely expensive because
* we are using distinct. You almost _NEVER_ need all the fields
* in such a large SELECT
*
* @global object
* @global object
* @global object
* @uses CONTEXT_COURSE
* @param string|int $categoryid Either a category id or 'all' for everything
* @param string $sort A field and direction to sort by
* @param string $fields The additional fields to return
* @return array Array of courses
*/
function get_courses($categoryid="all", $sort="c.sortorder ASC", $fields="c.*") {
global $USER, $CFG, $DB;
$params = array();
if ($categoryid !== "all" && is_numeric($categoryid)) {
$categoryselect = "WHERE c.category = :catid";
$params['catid'] = $categoryid;
} else {
$categoryselect = "";
}
if (empty($sort)) {
$sortstatement = "";
} else {
$sortstatement = "ORDER BY $sort";
}
$visiblecourses = array();
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$sql = "SELECT $fields $ccselect
FROM {course} c
$ccjoin
$categoryselect
$sortstatement";
// pull out all course matching the cat
if ($courses = $DB->get_records_sql($sql, $params)) {
// loop throught them
foreach ($courses as $course) {
context_instance_preload($course);
if (isset($course->visible) && $course->visible <= 0) {
// for hidden courses, require visibility check
if (has_capability('moodle/course:viewhiddencourses', context_course::instance($course->id))) {
$visiblecourses [$course->id] = $course;
}
} else {
$visiblecourses [$course->id] = $course;
}
}
}
return $visiblecourses;
}
/**
* Returns list of courses, for whole site, or category
*
* Similar to get_courses, but allows paging
* Important: Using c.* for fields is extremely expensive because
* we are using distinct. You almost _NEVER_ need all the fields
* in such a large SELECT
*
* @global object
* @global object
* @global object
* @uses CONTEXT_COURSE
* @param string|int $categoryid Either a category id or 'all' for everything
* @param string $sort A field and direction to sort by
* @param string $fields The additional fields to return
* @param int $totalcount Reference for the number of courses
* @param string $limitfrom The course to start from
* @param string $limitnum The number of courses to limit to
* @return array Array of courses
*/
function get_courses_page($categoryid="all", $sort="c.sortorder ASC", $fields="c.*",
&$totalcount, $limitfrom="", $limitnum="") {
global $USER, $CFG, $DB;
$params = array();
$categoryselect = "";
if ($categoryid !== "all" && is_numeric($categoryid)) {
$categoryselect = "WHERE c.category = :catid";
$params['catid'] = $categoryid;
} else {
$categoryselect = "";
}
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$totalcount = 0;
if (!$limitfrom) {
$limitfrom = 0;
}
$visiblecourses = array();
$sql = "SELECT $fields $ccselect
FROM {course} c
$ccjoin
$categoryselect
ORDER BY $sort";
// pull out all course matching the cat
$rs = $DB->get_recordset_sql($sql, $params);
// iteration will have to be done inside loop to keep track of the limitfrom and limitnum
foreach($rs as $course) {
context_instance_preload($course);
if ($course->visible <= 0) {
// for hidden courses, require visibility check
if (has_capability('moodle/course:viewhiddencourses', context_course::instance($course->id))) {
$totalcount++;
if ($totalcount > $limitfrom && (!$limitnum or count($visiblecourses) < $limitnum)) {
$visiblecourses [$course->id] = $course;
}
}
} else {
$totalcount++;
if ($totalcount > $limitfrom && (!$limitnum or count($visiblecourses) < $limitnum)) {
$visiblecourses [$course->id] = $course;
}
}
}
$rs->close();
return $visiblecourses;
}
/**
* A list of courses that match a search
*
* @global object
* @global object
* @param array $searchterms An array of search criteria
* @param string $sort A field and direction to sort by
* @param int $page The page number to get
* @param int $recordsperpage The number of records per page
* @param int $totalcount Passed in by reference.
* @return object {@link $COURSE} records
*/
function get_courses_search($searchterms, $sort, $page, $recordsperpage, &$totalcount) {
global $CFG, $DB;
if ($DB->sql_regex_supported()) {
$REGEXP = $DB->sql_regex(true);
$NOTREGEXP = $DB->sql_regex(false);
}
$searchcond = array();
$params = array();
$i = 0;
// Thanks Oracle for your non-ansi concat and type limits in coalesce. MDL-29912
if ($DB->get_dbfamily() == 'oracle') {
$concat = "(c.summary|| ' ' || c.fullname || ' ' || c.idnumber || ' ' || c.shortname)";
} else {
$concat = $DB->sql_concat("COALESCE(c.summary, '')", "' '", 'c.fullname', "' '", 'c.idnumber', "' '", 'c.shortname');
}
foreach ($searchterms as $searchterm) {
$i++;
$NOT = false; /// Initially we aren't going to perform NOT LIKE searches, only MSSQL and Oracle
/// will use it to simulate the "-" operator with LIKE clause
/// Under Oracle and MSSQL, trim the + and - operators and perform
/// simpler LIKE (or NOT LIKE) queries
if (!$DB->sql_regex_supported()) {
if (substr($searchterm, 0, 1) == '-') {
$NOT = true;
}
$searchterm = trim($searchterm, '+-');
}
// TODO: +- may not work for non latin languages
if (substr($searchterm,0,1) == '+') {
$searchterm = trim($searchterm, '+-');
$searchterm = preg_quote($searchterm, '|');
$searchcond[] = "$concat $REGEXP :ss$i";
$params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
} else if (substr($searchterm,0,1) == "-") {
$searchterm = trim($searchterm, '+-');
$searchterm = preg_quote($searchterm, '|');
$searchcond[] = "$concat $NOTREGEXP :ss$i";
$params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
} else {
$searchcond[] = $DB->sql_like($concat,":ss$i", false, true, $NOT);
$params['ss'.$i] = "%$searchterm%";
}
}
if (empty($searchcond)) {
$totalcount = 0;
return array();
}
$searchcond = implode(" AND ", $searchcond);
$courses = array();
$c = 0; // counts how many visible courses we've seen
// Tiki pagination
$limitfrom = $page * $recordsperpage;
$limitto = $limitfrom + $recordsperpage;
list($ccselect, $ccjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
$fields = array_diff(array_keys($DB->get_columns('course')), array('modinfo', 'sectioncache'));
$sql = "SELECT c.".join(',c.',$fields)." $ccselect
FROM {course} c
$ccjoin
WHERE $searchcond AND c.id <> ".SITEID."
ORDER BY $sort";
$rs = $DB->get_recordset_sql($sql, $params);
foreach($rs as $course) {
if (!$course->visible) {
// preload contexts only for hidden courses or courses we need to return
context_instance_preload($course);
$coursecontext = context_course::instance($course->id);
if (!has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
continue;
}
}
// Don't exit this loop till the end
// we need to count all the visible courses
// to update $totalcount
if ($c >= $limitfrom && $c < $limitto) {
$courses[$course->id] = $course;
}
$c++;
}
$rs->close();
// our caller expects 2 bits of data - our return
// array, and an updated $totalcount
$totalcount = $c;
return $courses;
}
/**
* Fixes course category and course sortorder, also verifies category and course parents and paths.
* (circular references are not fixed)
*
* @global object
* @global object
* @uses MAX_COURSES_IN_CATEGORY
* @uses MAX_COURSE_CATEGORIES
* @uses SITEID
* @uses CONTEXT_COURSE
* @return void
*/
function fix_course_sortorder() {
global $DB, $SITE;
//WARNING: this is PHP5 only code!
// if there are any changes made to courses or categories we will trigger
// the cache events to purge all cached courses/categories data
$cacheevents = array();
if ($unsorted = $DB->get_records('course_categories', array('sortorder'=>0))) {
//move all categories that are not sorted yet to the end
$DB->set_field('course_categories', 'sortorder', MAX_COURSES_IN_CATEGORY*MAX_COURSE_CATEGORIES, array('sortorder'=>0));
$cacheevents['changesincoursecat'] = true;
}
$allcats = $DB->get_records('course_categories', null, 'sortorder, id', 'id, sortorder, parent, depth, path');
$topcats = array();
$brokencats = array();
foreach ($allcats as $cat) {
$sortorder = (int)$cat->sortorder;
if (!$cat->parent) {
while(isset($topcats[$sortorder])) {
$sortorder++;
}
$topcats[$sortorder] = $cat;
continue;
}
if (!isset($allcats[$cat->parent])) {
$brokencats[] = $cat;
continue;
}
if (!isset($allcats[$cat->parent]->children)) {
$allcats[$cat->parent]->children = array();
}
while(isset($allcats[$cat->parent]->children[$sortorder])) {
$sortorder++;
}
$allcats[$cat->parent]->children[$sortorder] = $cat;
}
unset($allcats);
// add broken cats to category tree
if ($brokencats) {
$defaultcat = reset($topcats);
foreach ($brokencats as $cat) {
$topcats[] = $cat;
}
}
// now walk recursively the tree and fix any problems found
$sortorder = 0;
$fixcontexts = array();
if (_fix_course_cats($topcats, $sortorder, 0, 0, '', $fixcontexts)) {
$cacheevents['changesincoursecat'] = true;
}
// detect if there are "multiple" frontpage courses and fix them if needed
$frontcourses = $DB->get_records('course', array('category'=>0), 'id');
if (count($frontcourses) > 1) {
if (isset($frontcourses[SITEID])) {
$frontcourse = $frontcourses[SITEID];
unset($frontcourses[SITEID]);
} else {
$frontcourse = array_shift($frontcourses);
}
$defaultcat = reset($topcats);
foreach ($frontcourses as $course) {
$DB->set_field('course', 'category', $defaultcat->id, array('id'=>$course->id));
$context = context_course::instance($course->id);
$fixcontexts[$context->id] = $context;
$cacheevents['changesincourse'] = true;
}
unset($frontcourses);
} else {
$frontcourse = reset($frontcourses);
}
// now fix the paths and depths in context table if needed
if ($fixcontexts) {
foreach ($fixcontexts as $fixcontext) {
$fixcontext->reset_paths(false);
}
context_helper::build_all_paths(false);
unset($fixcontexts);
$cacheevents['changesincourse'] = true;
$cacheevents['changesincoursecat'] = true;
}
// release memory
unset($topcats);
unset($brokencats);
unset($fixcontexts);
// fix frontpage course sortorder
if ($frontcourse->sortorder != 1) {
$DB->set_field('course', 'sortorder', 1, array('id'=>$frontcourse->id));
$cacheevents['changesincourse'] = true;
}
// now fix the course counts in category records if needed
$sql = "SELECT cc.id, cc.coursecount, COUNT(c.id) AS newcount
FROM {course_categories} cc
LEFT JOIN {course} c ON c.category = cc.id
GROUP BY cc.id, cc.coursecount
HAVING cc.coursecount <> COUNT(c.id)";
if ($updatecounts = $DB->get_records_sql($sql)) {
// categories with more courses than MAX_COURSES_IN_CATEGORY
$categories = array();
foreach ($updatecounts as $cat) {
$cat->coursecount = $cat->newcount;
if ($cat->coursecount >= MAX_COURSES_IN_CATEGORY) {
$categories[] = $cat->id;
}
unset($cat->newcount);
$DB->update_record_raw('course_categories', $cat, true);
}
if (!empty($categories)) {
$str = implode(', ', $categories);
debugging("The number of courses (category id: $str) has reached MAX_COURSES_IN_CATEGORY (" . MAX_COURSES_IN_CATEGORY . "), it will cause a sorting performance issue, please increase the value of MAX_COURSES_IN_CATEGORY in lib/datalib.php file. See tracker issue: MDL-25669", DEBUG_DEVELOPER);
}
$cacheevents['changesincoursecat'] = true;
}
// now make sure that sortorders in course table are withing the category sortorder ranges
$sql = "SELECT DISTINCT cc.id, cc.sortorder
FROM {course_categories} cc
JOIN {course} c ON c.category = cc.id
WHERE c.sortorder < cc.sortorder OR c.sortorder > cc.sortorder + ".MAX_COURSES_IN_CATEGORY;
if ($fixcategories = $DB->get_records_sql($sql)) {
//fix the course sortorder ranges
foreach ($fixcategories as $cat) {
$sql = "UPDATE {course}
SET sortorder = ".$DB->sql_modulo('sortorder', MAX_COURSES_IN_CATEGORY)." + ?
WHERE category = ?";
$DB->execute($sql, array($cat->sortorder, $cat->id));
}
$cacheevents['changesincoursecat'] = true;
}
unset($fixcategories);
// categories having courses with sortorder duplicates or having gaps in sortorder
$sql = "SELECT DISTINCT c1.category AS id , cc.sortorder
FROM {course} c1
JOIN {course} c2 ON c1.sortorder = c2.sortorder
JOIN {course_categories} cc ON (c1.category = cc.id)
WHERE c1.id <> c2.id";
$fixcategories = $DB->get_records_sql($sql);
$sql = "SELECT cc.id, cc.sortorder, cc.coursecount, MAX(c.sortorder) AS maxsort, MIN(c.sortorder) AS minsort
FROM {course_categories} cc
JOIN {course} c ON c.category = cc.id
GROUP BY cc.id, cc.sortorder, cc.coursecount
HAVING (MAX(c.sortorder) <> cc.sortorder + cc.coursecount) OR (MIN(c.sortorder) <> cc.sortorder + 1)";
$gapcategories = $DB->get_records_sql($sql);
foreach ($gapcategories as $cat) {
if (isset($fixcategories[$cat->id])) {
// duplicates detected already
} else if ($cat->minsort == $cat->sortorder and $cat->maxsort == $cat->sortorder + $cat->coursecount - 1) {
// easy - new course inserted with sortorder 0, the rest is ok
$sql = "UPDATE {course}
SET sortorder = sortorder + 1
WHERE category = ?";
$DB->execute($sql, array($cat->id));
} else {
// it needs full resorting
$fixcategories[$cat->id] = $cat;
}
$cacheevents['changesincourse'] = true;
}
unset($gapcategories);
// fix course sortorders in problematic categories only
foreach ($fixcategories as $cat) {