MDL-51324 forms: Add a new course selector
[moodle.git] / lib / datalib.php
CommitLineData
3564771d 1<?php
117bd748
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2// This file is part of Moodle - http://moodle.org/
3//
3564771d 4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
117bd748 13//
3564771d 14// You should have received a copy of the GNU General Public License
15// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
341b5ed2 16
7cf1c7bd 17/**
18 * Library of functions for database manipulation.
5930cded 19 *
7cf1c7bd 20 * Other main libraries:
21 * - weblib.php - functions that produce web output
22 * - moodlelib.php - general-purpose Moodle functions
3564771d 23 *
78bfb562 24 * @package core
78bfb562
PS
25 * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
26 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
7cf1c7bd 27 */
28
78bfb562
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29defined('MOODLE_INTERNAL') || die();
30
4f0c2d00
PS
31/**
32 * The maximum courses in a category
33 * MAX_COURSES_IN_CATEGORY * MAX_COURSE_CATEGORIES must not be more than max integer!
34 */
3564771d 35define('MAX_COURSES_IN_CATEGORY', 10000);
4f0c2d00 36
117bd748 37/**
3564771d 38 * The maximum number of course categories
117bd748 39 * MAX_COURSES_IN_CATEGORY * MAX_COURSE_CATEGORIES must not be more than max integer!
3564771d 40 */
0cbe8111 41define('MAX_COURSE_CATEGORIES', 10000);
42
4f0c2d00
PS
43/**
44 * Number of seconds to wait before updating lastaccess information in DB.
0793389f
DM
45 *
46 * We allow overwrites from config.php, useful to ensure coherence in performance
47 * tests results.
4f0c2d00 48 */
0793389f
DM
49if (!defined('LASTACCESS_UPDATE_SECS')) {
50 define('LASTACCESS_UPDATE_SECS', 60);
51}
df28d6c5 52
18a97fd8 53/**
fbc21ae8 54 * Returns $user object of the main admin user
3564771d 55 *
5d6ab054 56 * @static stdClass $mainadmin
b739d51b 57 * @return stdClass {@link $USER} record from DB, false if not found
fbc21ae8 58 */
4f0c2d00 59function get_admin() {
bb6ccfa5
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60 global $CFG, $DB;
61
4f0c2d00 62 static $mainadmin = null;
3ed57516 63 static $prevadmins = null;
2965f8fd 64
c90e6b46
AD
65 if (empty($CFG->siteadmins)) {
66 // Should not happen on an ordinary site.
67 // It does however happen during unit tests.
3ed57516 68 return false;
bb6ccfa5
PS
69 }
70
3ed57516
PS
71 if (isset($mainadmin) and $prevadmins === $CFG->siteadmins) {
72 return clone($mainadmin);
b8d13bec
PS
73 }
74
3ed57516
PS
75 $mainadmin = null;
76
bb6ccfa5
PS
77 foreach (explode(',', $CFG->siteadmins) as $id) {
78 if ($user = $DB->get_record('user', array('id'=>$id, 'deleted'=>0))) {
79 $mainadmin = $user;
80 break;
df28d6c5 81 }
df28d6c5 82 }
bb6ccfa5
PS
83
84 if ($mainadmin) {
3ed57516 85 $prevadmins = $CFG->siteadmins;
bb6ccfa5
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86 return clone($mainadmin);
87 } else {
88 // this should not happen
89 return false;
90 }
df28d6c5 91}
92
18a97fd8 93/**
4f0c2d00 94 * Returns list of all admins, using 1 DB query
fbc21ae8 95 *
3564771d 96 * @return array
fbc21ae8 97 */
df28d6c5 98function get_admins() {
4f0c2d00 99 global $DB, $CFG;
5930cded 100
7928979b 101 if (empty($CFG->siteadmins)) { // Should not happen on an ordinary site
adf176d7 102 return array();
7928979b
MD
103 }
104
4f0c2d00 105 $sql = "SELECT u.*
624a690b 106 FROM {user} u
4f0c2d00 107 WHERE u.deleted = 0 AND u.id IN ($CFG->siteadmins)";
5930cded 108
3ed57516
PS
109 // We want the same order as in $CFG->siteadmins.
110 $records = $DB->get_records_sql($sql);
111 $admins = array();
112 foreach (explode(',', $CFG->siteadmins) as $id) {
113 $id = (int)$id;
114 if (!isset($records[$id])) {
115 // User does not exist, this should not happen.
116 continue;
117 }
118 $admins[$records[$id]->id] = $records[$id];
119 }
120
121 return $admins;
df28d6c5 122}
123
900df8b6 124/**
fbc21ae8 125 * Search through course users
126 *
5930cded 127 * If $coursid specifies the site course then this function searches
fbc21ae8 128 * through all undeleted and confirmed users
129 *
3564771d 130 * @global object
131 * @uses SITEID
132 * @uses SQL_PARAMS_NAMED
133 * @uses CONTEXT_COURSE
fbc21ae8 134 * @param int $courseid The course in question.
135 * @param int $groupid The group in question.
3564771d 136 * @param string $searchtext The string to search for
137 * @param string $sort A field to sort by
138 * @param array $exceptions A list of IDs to ignore, eg 2,4,5,8,9,10
139 * @return array
fbc21ae8 140 */
624a690b 141function search_users($courseid, $groupid, $searchtext, $sort='', array $exceptions=null) {
142 global $DB;
0720313b 143
245ac557 144 $fullname = $DB->sql_fullname('u.firstname', 'u.lastname');
8f0cd6ef 145
900df8b6 146 if (!empty($exceptions)) {
cf717dc2 147 list($exceptions, $params) = $DB->get_in_or_equal($exceptions, SQL_PARAMS_NAMED, 'ex', false);
624a690b 148 $except = "AND u.id $exceptions";
900df8b6 149 } else {
624a690b 150 $except = "";
151 $params = array();
900df8b6 152 }
2700d113 153
900df8b6 154 if (!empty($sort)) {
624a690b 155 $order = "ORDER BY $sort";
900df8b6 156 } else {
624a690b 157 $order = "";
900df8b6 158 }
8f0cd6ef 159
b0238f06 160 $select = "u.deleted = 0 AND u.confirmed = 1 AND (".$DB->sql_like($fullname, ':search1', false)." OR ".$DB->sql_like('u.email', ':search2', false).")";
624a690b 161 $params['search1'] = "%$searchtext%";
162 $params['search2'] = "%$searchtext%";
2700d113 163
222ac91b 164 if (!$courseid or $courseid == SITEID) {
624a690b 165 $sql = "SELECT u.id, u.firstname, u.lastname, u.email
166 FROM {user} u
167 WHERE $select
168 $except
169 $order";
170 return $DB->get_records_sql($sql, $params);
2700d113 171
624a690b 172 } else {
900df8b6 173 if ($groupid) {
624a690b 174 $sql = "SELECT u.id, u.firstname, u.lastname, u.email
175 FROM {user} u
176 JOIN {groups_members} gm ON gm.userid = u.id
177 WHERE $select AND gm.groupid = :groupid
178 $except
179 $order";
180 $params['groupid'] = $groupid;
181 return $DB->get_records_sql($sql, $params);
182
900df8b6 183 } else {
b0c6dc1c 184 $context = context_course::instance($courseid);
4e829d48
MN
185
186 // We want to query both the current context and parent contexts.
187 list($relatedctxsql, $relatedctxparams) = $DB->get_in_or_equal($context->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'relatedctx');
624a690b 188
189 $sql = "SELECT u.id, u.firstname, u.lastname, u.email
190 FROM {user} u
191 JOIN {role_assignments} ra ON ra.userid = u.id
4e829d48 192 WHERE $select AND ra.contextid $relatedctxsql
624a690b 193 $except
194 $order";
4e829d48 195 $params = array_merge($params, $relatedctxparams);
624a690b 196 return $DB->get_records_sql($sql, $params);
900df8b6 197 }
198 }
df28d6c5 199}
200
b2ec866f 201/**
202 * Returns SQL used to search through user table to find users (in a query
203 * which may also join and apply other conditions).
204 *
205 * You can combine this SQL with an existing query by adding 'AND $sql' to the
206 * WHERE clause of your query (where $sql is the first element in the array
207 * returned by this function), and merging in the $params array to the parameters
208 * of your query (where $params is the second element). Your query should use
209 * named parameters such as :param, rather than the question mark style.
210 *
211 * There are examples of basic usage in the unit test for this function.
212 *
213 * @param string $search the text to search for (empty string = find all)
214 * @param string $u the table alias for the user table in the query being
215 * built. May be ''.
216 * @param bool $searchanywhere If true (default), searches in the middle of
217 * names, otherwise only searches at start
218 * @param array $extrafields Array of extra user fields to include in search
219 * @param array $exclude Array of user ids to exclude (empty = don't exclude)
220 * @param array $includeonly If specified, only returns users that have ids
221 * incldued in this array (empty = don't restrict)
222 * @return array an array with two elements, a fragment of SQL to go in the
223 * where clause the query, and an associative array containing any required
224 * parameters (using named placeholders).
225 */
226function users_search_sql($search, $u = 'u', $searchanywhere = true, array $extrafields = array(),
d2e32121 227 array $exclude = null, array $includeonly = null) {
b2ec866f 228 global $DB, $CFG;
229 $params = array();
230 $tests = array();
231
232 if ($u) {
233 $u .= '.';
234 }
235
236 // If we have a $search string, put a field LIKE '$search%' condition on each field.
237 if ($search) {
238 $conditions = array(
239 $DB->sql_fullname($u . 'firstname', $u . 'lastname'),
240 $conditions[] = $u . 'lastname'
241 );
242 foreach ($extrafields as $field) {
243 $conditions[] = $u . $field;
244 }
245 if ($searchanywhere) {
246 $searchparam = '%' . $search . '%';
247 } else {
248 $searchparam = $search . '%';
249 }
250 $i = 0;
251 foreach ($conditions as $key => $condition) {
252 $conditions[$key] = $DB->sql_like($condition, ":con{$i}00", false, false);
253 $params["con{$i}00"] = $searchparam;
254 $i++;
255 }
256 $tests[] = '(' . implode(' OR ', $conditions) . ')';
257 }
258
259 // Add some additional sensible conditions.
260 $tests[] = $u . "id <> :guestid";
261 $params['guestid'] = $CFG->siteguest;
262 $tests[] = $u . 'deleted = 0';
263 $tests[] = $u . 'confirmed = 1';
264
265 // If we are being asked to exclude any users, do that.
266 if (!empty($exclude)) {
267 list($usertest, $userparams) = $DB->get_in_or_equal($exclude, SQL_PARAMS_NAMED, 'ex', false);
268 $tests[] = $u . 'id ' . $usertest;
269 $params = array_merge($params, $userparams);
270 }
271
272 // If we are validating a set list of userids, add an id IN (...) test.
273 if (!empty($includeonly)) {
274 list($usertest, $userparams) = $DB->get_in_or_equal($includeonly, SQL_PARAMS_NAMED, 'val');
275 $tests[] = $u . 'id ' . $usertest;
276 $params = array_merge($params, $userparams);
277 }
278
279 // In case there are no tests, add one result (this makes it easier to combine
280 // this with an existing query as you can always add AND $sql).
281 if (empty($tests)) {
282 $tests[] = '1 = 1';
283 }
284
285 // Combing the conditions and return.
286 return array(implode(' AND ', $tests), $params);
287}
288
289
9f82ddd6
TH
290/**
291 * This function generates the standard ORDER BY clause for use when generating
292 * lists of users. If you don't have a reason to use a different order, then
293 * you should use this method to generate the order when displaying lists of users.
294 *
295 * If the optional $search parameter is passed, then exact matches to the search
296 * will be sorted first. For example, suppose you have two users 'Al Zebra' and
297 * 'Alan Aardvark'. The default sort is Alan, then Al. If, however, you search for
298 * 'Al', then Al will be listed first. (With two users, this is not a big deal,
299 * but with thousands of users, it is essential.)
300 *
301 * The list of fields scanned for exact matches are:
302 * - firstname
303 * - lastname
304 * - $DB->sql_fullname
305 * - those returned by get_extra_user_fields
306 *
307 * If named parameters are used (which is the default, and highly recommended),
308 * then the parameter names are like :usersortexactN, where N is an int.
309 *
310 * The simplest possible example use is:
311 * list($sort, $params) = users_order_by_sql();
312 * $sql = 'SELECT * FROM {users} ORDER BY ' . $sort;
313 *
314 * A more complex example, showing that this sort can be combined with other sorts:
315 * list($sort, $sortparams) = users_order_by_sql('u');
316 * $sql = "SELECT g.id AS groupid, gg.groupingid, u.id AS userid, u.firstname, u.lastname, u.idnumber, u.username
317 * FROM {groups} g
318 * LEFT JOIN {groupings_groups} gg ON g.id = gg.groupid
319 * LEFT JOIN {groups_members} gm ON g.id = gm.groupid
320 * LEFT JOIN {user} u ON gm.userid = u.id
321 * WHERE g.courseid = :courseid $groupwhere $groupingwhere
322 * ORDER BY g.name, $sort";
323 * $params += $sortparams;
324 *
325 * An example showing the use of $search:
326 * list($sort, $sortparams) = users_order_by_sql('u', $search, $this->get_context());
327 * $order = ' ORDER BY ' . $sort;
328 * $params += $sortparams;
329 * $availableusers = $DB->get_records_sql($fields . $sql . $order, $params, $page*$perpage, $perpage);
330 *
331 * @param string $usertablealias (optional) any table prefix for the {users} table. E.g. 'u'.
332 * @param string $search (optional) a current search string. If given,
333 * any exact matches to this string will be sorted first.
334 * @param context $context the context we are in. Use by get_extra_user_fields.
335 * Defaults to $PAGE->context.
336 * @return array with two elements:
337 * string SQL fragment to use in the ORDER BY clause. For example, "firstname, lastname".
338 * array of parameters used in the SQL fragment.
339 */
340function users_order_by_sql($usertablealias = '', $search = null, context $context = null) {
341 global $DB, $PAGE;
342
343 if ($usertablealias) {
344 $tableprefix = $usertablealias . '.';
345 } else {
346 $tableprefix = '';
347 }
348
349 $sort = "{$tableprefix}lastname, {$tableprefix}firstname, {$tableprefix}id";
350 $params = array();
351
352 if (!$search) {
353 return array($sort, $params);
354 }
355
356 if (!$context) {
357 $context = $PAGE->context;
358 }
359
360 $exactconditions = array();
361 $paramkey = 'usersortexact1';
362
363 $exactconditions[] = $DB->sql_fullname($tableprefix . 'firstname', $tableprefix . 'lastname') .
364 ' = :' . $paramkey;
365 $params[$paramkey] = $search;
366 $paramkey++;
367
368 $fieldstocheck = array_merge(array('firstname', 'lastname'), get_extra_user_fields($context));
369 foreach ($fieldstocheck as $key => $field) {
c2004a79 370 $exactconditions[] = 'LOWER(' . $tableprefix . $field . ') = LOWER(:' . $paramkey . ')';
9f82ddd6
TH
371 $params[$paramkey] = $search;
372 $paramkey++;
373 }
374
375 $sort = 'CASE WHEN ' . implode(' OR ', $exactconditions) .
376 ' THEN 0 ELSE 1 END, ' . $sort;
377
378 return array($sort, $params);
379}
380
18a97fd8 381/**
fbc21ae8 382 * Returns a subset of users
383 *
3564771d 384 * @global object
385 * @uses DEBUG_DEVELOPER
386 * @uses SQL_PARAMS_NAMED
7290c7fa 387 * @param bool $get If false then only a count of the records is returned
fbc21ae8 388 * @param string $search A simple string to search for
7290c7fa 389 * @param bool $confirmed A switch to allow/disallow unconfirmed users
3564771d 390 * @param array $exceptions A list of IDs to ignore, eg 2,4,5,8,9,10
fbc21ae8 391 * @param string $sort A SQL snippet for the sorting criteria to use
3564771d 392 * @param string $firstinitial Users whose first name starts with $firstinitial
393 * @param string $lastinitial Users whose last name starts with $lastinitial
394 * @param string $page The page or records to return
395 * @param string $recordsperpage The number of records to return per page
fbc21ae8 396 * @param string $fields A comma separated list of fields to be returned from the chosen table.
117bd748 397 * @return array|int|bool {@link $USER} records unless get is false in which case the integer count of the records found is returned.
9f82ddd6 398 * False is returned if an error is encountered.
fbc21ae8 399 */
624a690b 400function get_users($get=true, $search='', $confirmed=false, array $exceptions=null, $sort='firstname ASC',
401 $firstinitial='', $lastinitial='', $page='', $recordsperpage='', $fields='*', $extraselect='', array $extraparams=null) {
b3df1764 402 global $DB, $CFG;
5930cded 403
36075e09 404 if ($get && !$recordsperpage) {
405 debugging('Call to get_users with $get = true no $recordsperpage limit. ' .
406 'On large installations, this will probably cause an out of memory error. ' .
407 'Please think again and change your code so that it does not try to ' .
03517306 408 'load so much data into memory.', DEBUG_DEVELOPER);
36075e09 409 }
18a97fd8 410
245ac557 411 $fullname = $DB->sql_fullname();
e384fb7b 412
b3df1764
PS
413 $select = " id <> :guestid AND deleted = 0";
414 $params = array('guestid'=>$CFG->siteguest);
488acd1b 415
0044147e 416 if (!empty($search)){
417 $search = trim($search);
b0238f06 418 $select .= " AND (".$DB->sql_like($fullname, ':search1', false)." OR ".$DB->sql_like('email', ':search2', false)." OR username = :search3)";
624a690b 419 $params['search1'] = "%$search%";
420 $params['search2'] = "%$search%";
421 $params['search3'] = "$search";
e384fb7b 422 }
423
5a741655 424 if ($confirmed) {
624a690b 425 $select .= " AND confirmed = 1";
5a741655 426 }
427
428 if ($exceptions) {
cf717dc2 429 list($exceptions, $eparams) = $DB->get_in_or_equal($exceptions, SQL_PARAMS_NAMED, 'ex', false);
624a690b 430 $params = $params + $eparams;
cdca666b 431 $select .= " AND id $exceptions";
5a741655 432 }
433
488acd1b 434 if ($firstinitial) {
b0238f06 435 $select .= " AND ".$DB->sql_like('firstname', ':fni', false, false);
624a690b 436 $params['fni'] = "$firstinitial%";
8f0cd6ef 437 }
488acd1b 438 if ($lastinitial) {
b0238f06 439 $select .= " AND ".$DB->sql_like('lastname', ':lni', false, false);
624a690b 440 $params['lni'] = "$lastinitial%";
8f0cd6ef 441 }
488acd1b 442
cd1edf9e 443 if ($extraselect) {
624a690b 444 $select .= " AND $extraselect";
445 $params = $params + (array)$extraparams;
cd1edf9e 446 }
447
5a741655 448 if ($get) {
624a690b 449 return $DB->get_records_select('user', $select, $params, $sort, $fields, $page, $recordsperpage);
5a741655 450 } else {
624a690b 451 return $DB->count_records_select('user', $select, $params);
5a741655 452 }
9fa49e22 453}
454
5a741655 455
18a97fd8 456/**
043f1005 457 * Return filtered (if provided) list of users in site, except guest and deleted users.
3564771d 458 *
459 * @param string $sort An SQL field to sort by
460 * @param string $dir The sort direction ASC|DESC
461 * @param int $page The page or records to return
462 * @param int $recordsperpage The number of records to return per page
463 * @param string $search A simple string to search for
464 * @param string $firstinitial Users whose first name starts with $firstinitial
465 * @param string $lastinitial Users whose last name starts with $lastinitial
466 * @param string $extraselect An additional SQL select statement to append to the query
467 * @param array $extraparams Additional parameters to use for the above $extraselect
043f1005 468 * @param stdClass $extracontext If specified, will include user 'extra fields'
1fdc0c6a 469 * as appropriate for current user and given context
3564771d 470 * @return array Array of {@link $USER} records
fbc21ae8 471 */
36075e09 472function get_users_listing($sort='lastaccess', $dir='ASC', $page=0, $recordsperpage=0,
1fdc0c6a 473 $search='', $firstinitial='', $lastinitial='', $extraselect='',
474 array $extraparams=null, $extracontext = null) {
4e0b615e 475 global $DB, $CFG;
31fefa63 476
245ac557 477 $fullname = $DB->sql_fullname();
c2a96d6b 478
4e0b615e
RT
479 $select = "deleted <> 1 AND id <> :guestid";
480 $params = array('guestid' => $CFG->siteguest);
488acd1b 481
0044147e 482 if (!empty($search)) {
483 $search = trim($search);
f63ac65a
PS
484 $select .= " AND (". $DB->sql_like($fullname, ':search1', false, false).
485 " OR ". $DB->sql_like('email', ':search2', false, false).
486 " OR username = :search3)";
624a690b 487 $params['search1'] = "%$search%";
488 $params['search2'] = "%$search%";
489 $params['search3'] = "$search";
488acd1b 490 }
491
492 if ($firstinitial) {
f63ac65a 493 $select .= " AND ". $DB->sql_like('firstname', ':fni', false, false);
624a690b 494 $params['fni'] = "$firstinitial%";
488acd1b 495 }
488acd1b 496 if ($lastinitial) {
f63ac65a 497 $select .= " AND ". $DB->sql_like('lastname', ':lni', false, false);
624a690b 498 $params['lni'] = "$lastinitial%";
c750592a 499 }
500
cd1edf9e 501 if ($extraselect) {
624a690b 502 $select .= " AND $extraselect";
503 $params = $params + (array)$extraparams;
cd1edf9e 504 }
03d820c7 505
488acd1b 506 if ($sort) {
624a690b 507 $sort = " ORDER BY $sort $dir";
488acd1b 508 }
509
1fdc0c6a 510 // If a context is specified, get extra user fields that the current user
511 // is supposed to see.
512 $extrafields = '';
513 if ($extracontext) {
514 $extrafields = get_extra_user_fields_sql($extracontext, '', '',
515 array('id', 'username', 'email', 'firstname', 'lastname', 'city', 'country',
516 'lastaccess', 'confirmed', 'mnethostid'));
517 }
a327f25e
AG
518 $namefields = get_all_user_name_fields(true);
519 $extrafields = "$extrafields, $namefields";
1fdc0c6a 520
521 // warning: will return UNCONFIRMED USERS
a327f25e 522 return $DB->get_records_sql("SELECT id, username, email, city, country, lastaccess, confirmed, mnethostid, suspended $extrafields
624a690b 523 FROM {user}
524 WHERE $select
525 $sort", $params, $page, $recordsperpage);
9fa49e22 526
527}
528
488acd1b 529
18a97fd8 530/**
7290c7fa 531 * Full list of users that have confirmed their accounts.
fbc21ae8 532 *
3564771d 533 * @global object
624a690b 534 * @return array of unconfirmed users
fbc21ae8 535 */
9fa49e22 536function get_users_confirmed() {
b3df1764 537 global $DB, $CFG;
624a690b 538 return $DB->get_records_sql("SELECT *
539 FROM {user}
b3df1764 540 WHERE confirmed = 1 AND deleted = 0 AND id <> ?", array($CFG->siteguest));
9fa49e22 541}
542
543
02ebf404 544/// OTHER SITE AND COURSE FUNCTIONS /////////////////////////////////////////////
545
546
18a97fd8 547/**
fbc21ae8 548 * Returns $course object of the top-level site.
549 *
3f77c158 550 * @return object A {@link $COURSE} object for the site, exception if not found
fbc21ae8 551 */
c44d5d42 552function get_site() {
624a690b 553 global $SITE, $DB;
c44d5d42 554
555 if (!empty($SITE->id)) { // We already have a global to use, so return that
556 return $SITE;
557 }
02ebf404 558
624a690b 559 if ($course = $DB->get_record('course', array('category'=>0))) {
02ebf404 560 return $course;
561 } else {
3f77c158
PS
562 // course table exists, but the site is not there,
563 // unfortunately there is no automatic way to recover
564 throw new moodle_exception('nosite', 'error');
02ebf404 565 }
566}
567
a2602457 568/**
569 * Gets a course object from database. If the course id corresponds to an
570 * already-loaded $COURSE or $SITE object, then the loaded object will be used,
571 * saving a database query.
572 *
573 * If it reuses an existing object, by default the object will be cloned. This
574 * means you can modify the object safely without affecting other code.
575 *
576 * @param int $courseid Course id
577 * @param bool $clone If true (default), makes a clone of the record
578 * @return stdClass A course object
579 * @throws dml_exception If not found in database
580 */
581function get_course($courseid, $clone = true) {
582 global $DB, $COURSE, $SITE;
583 if (!empty($COURSE->id) && $COURSE->id == $courseid) {
584 return $clone ? clone($COURSE) : $COURSE;
585 } else if (!empty($SITE->id) && $SITE->id == $courseid) {
586 return $clone ? clone($SITE) : $SITE;
587 } else {
588 return $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
589 }
590}
591
18a97fd8 592/**
613bbd7c 593 * Returns list of courses, for whole site, or category
594 *
595 * Returns list of courses, for whole site, or category
bfbfdb53 596 * Important: Using c.* for fields is extremely expensive because
613bbd7c 597 * we are using distinct. You almost _NEVER_ need all the fields
598 * in such a large SELECT
599 *
3564771d 600 * @global object
601 * @global object
602 * @global object
603 * @uses CONTEXT_COURSE
604 * @param string|int $categoryid Either a category id or 'all' for everything
605 * @param string $sort A field and direction to sort by
606 * @param string $fields The additional fields to return
607 * @return array Array of courses
613bbd7c 608 */
6315b1c8 609function get_courses($categoryid="all", $sort="c.sortorder ASC", $fields="c.*") {
02ebf404 610
3b8a284c 611 global $USER, $CFG, $DB;
5930cded 612
3b8a284c 613 $params = array();
614
615 if ($categoryid !== "all" && is_numeric($categoryid)) {
616 $categoryselect = "WHERE c.category = :catid";
617 $params['catid'] = $categoryid;
71dea306 618 } else {
5930cded 619 $categoryselect = "";
09575480 620 }
621
622 if (empty($sort)) {
623 $sortstatement = "";
624 } else {
625 $sortstatement = "ORDER BY $sort";
626 }
627
628 $visiblecourses = array();
5930cded 629
2e4c0c91
FM
630 $ccselect = ', ' . context_helper::get_preload_record_columns_sql('ctx');
631 $ccjoin = "LEFT JOIN {context} ctx ON (ctx.instanceid = c.id AND ctx.contextlevel = :contextlevel)";
632 $params['contextlevel'] = CONTEXT_COURSE;
4f0c2d00
PS
633
634 $sql = "SELECT $fields $ccselect
3b8a284c 635 FROM {course} c
4f0c2d00 636 $ccjoin
3b8a284c 637 $categoryselect
638 $sortstatement";
639
71dea306 640 // pull out all course matching the cat
3b8a284c 641 if ($courses = $DB->get_records_sql($sql, $params)) {
09575480 642
643 // loop throught them
644 foreach ($courses as $course) {
db314f34 645 context_helper::preload_from_record($course);
285f94f5 646 if (isset($course->visible) && $course->visible <= 0) {
09575480 647 // for hidden courses, require visibility check
b0c6dc1c 648 if (has_capability('moodle/course:viewhiddencourses', context_course::instance($course->id))) {
3b8a284c 649 $visiblecourses [$course->id] = $course;
09575480 650 }
651 } else {
3b8a284c 652 $visiblecourses [$course->id] = $course;
5930cded 653 }
09575480 654 }
6315b1c8 655 }
71dea306 656 return $visiblecourses;
8130b77b 657}
658
8130b77b 659
6315b1c8 660/**
613bbd7c 661 * Returns list of courses, for whole site, or category
662 *
663 * Similar to get_courses, but allows paging
5930cded 664 * Important: Using c.* for fields is extremely expensive because
613bbd7c 665 * we are using distinct. You almost _NEVER_ need all the fields
666 * in such a large SELECT
667 *
3564771d 668 * @global object
669 * @global object
670 * @global object
671 * @uses CONTEXT_COURSE
672 * @param string|int $categoryid Either a category id or 'all' for everything
673 * @param string $sort A field and direction to sort by
674 * @param string $fields The additional fields to return
675 * @param int $totalcount Reference for the number of courses
676 * @param string $limitfrom The course to start from
677 * @param string $limitnum The number of courses to limit to
117bd748 678 * @return array Array of courses
613bbd7c 679 */
6315b1c8 680function get_courses_page($categoryid="all", $sort="c.sortorder ASC", $fields="c.*",
681 &$totalcount, $limitfrom="", $limitnum="") {
3b8a284c 682 global $USER, $CFG, $DB;
c7fe5c6f 683
3b8a284c 684 $params = array();
5930cded 685
71dea306 686 $categoryselect = "";
2c49fb4c 687 if ($categoryid !== "all" && is_numeric($categoryid)) {
3b8a284c 688 $categoryselect = "WHERE c.category = :catid";
689 $params['catid'] = $categoryid;
71dea306 690 } else {
5930cded 691 $categoryselect = "";
692 }
693
2e4c0c91
FM
694 $ccselect = ', ' . context_helper::get_preload_record_columns_sql('ctx');
695 $ccjoin = "LEFT JOIN {context} ctx ON (ctx.instanceid = c.id AND ctx.contextlevel = :contextlevel)";
696 $params['contextlevel'] = CONTEXT_COURSE;
4f0c2d00 697
afa559e9
EL
698 $totalcount = 0;
699 if (!$limitfrom) {
700 $limitfrom = 0;
701 }
702 $visiblecourses = array();
703
4f0c2d00 704 $sql = "SELECT $fields $ccselect
3b8a284c 705 FROM {course} c
4f0c2d00 706 $ccjoin
3b8a284c 707 $categoryselect
708 ORDER BY $sort";
709
71dea306 710 // pull out all course matching the cat
afa559e9 711 $rs = $DB->get_recordset_sql($sql, $params);
71dea306 712 // iteration will have to be done inside loop to keep track of the limitfrom and limitnum
3b8a284c 713 foreach($rs as $course) {
db314f34 714 context_helper::preload_from_record($course);
03cedd62 715 if ($course->visible <= 0) {
716 // for hidden courses, require visibility check
b0c6dc1c 717 if (has_capability('moodle/course:viewhiddencourses', context_course::instance($course->id))) {
71dea306 718 $totalcount++;
03cedd62 719 if ($totalcount > $limitfrom && (!$limitnum or count($visiblecourses) < $limitnum)) {
3b8a284c 720 $visiblecourses [$course->id] = $course;
71dea306 721 }
722 }
03cedd62 723 } else {
724 $totalcount++;
725 if ($totalcount > $limitfrom && (!$limitnum or count($visiblecourses) < $limitnum)) {
3b8a284c 726 $visiblecourses [$course->id] = $course;
03cedd62 727 }
5930cded 728 }
71dea306 729 }
3b8a284c 730 $rs->close();
71dea306 731 return $visiblecourses;
02ebf404 732}
733
18a97fd8 734/**
7290c7fa 735 * A list of courses that match a search
fbc21ae8 736 *
3564771d 737 * @global object
738 * @global object
739 * @param array $searchterms An array of search criteria
740 * @param string $sort A field and direction to sort by
741 * @param int $page The page number to get
742 * @param int $recordsperpage The number of records per page
743 * @param int $totalcount Passed in by reference.
235ef57a 744 * @param array $requiredcapabilities Extra list of capabilities used to filter courses
7290c7fa 745 * @return object {@link $COURSE} records
fbc21ae8 746 */
235ef57a
DW
747function get_courses_search($searchterms, $sort, $page, $recordsperpage, &$totalcount,
748 $requiredcapabilities = array()) {
3b8a284c 749 global $CFG, $DB;
02ebf404 750
06c1a1da 751 if ($DB->sql_regex_supported()) {
752 $REGEXP = $DB->sql_regex(true);
753 $NOTREGEXP = $DB->sql_regex(false);
02ebf404 754 }
755
06c1a1da 756 $searchcond = array();
757 $params = array();
758 $i = 0;
02ebf404 759
86e00f97
EL
760 // Thanks Oracle for your non-ansi concat and type limits in coalesce. MDL-29912
761 if ($DB->get_dbfamily() == 'oracle') {
cc1e4332 762 $concat = "(c.summary|| ' ' || c.fullname || ' ' || c.idnumber || ' ' || c.shortname)";
86e00f97 763 } else {
cc1e4332 764 $concat = $DB->sql_concat("COALESCE(c.summary, '')", "' '", 'c.fullname', "' '", 'c.idnumber', "' '", 'c.shortname');
86e00f97 765 }
3b8a284c 766
02ebf404 767 foreach ($searchterms as $searchterm) {
06c1a1da 768 $i++;
6bb0f67f 769
b0238f06 770 $NOT = false; /// Initially we aren't going to perform NOT LIKE searches, only MSSQL and Oracle
0f62a5b5 771 /// will use it to simulate the "-" operator with LIKE clause
772
6bb0f67f 773 /// Under Oracle and MSSQL, trim the + and - operators and perform
0f62a5b5 774 /// simpler LIKE (or NOT LIKE) queries
06c1a1da 775 if (!$DB->sql_regex_supported()) {
0f62a5b5 776 if (substr($searchterm, 0, 1) == '-') {
b0238f06 777 $NOT = true;
0f62a5b5 778 }
6bb0f67f 779 $searchterm = trim($searchterm, '+-');
780 }
781
06c1a1da 782 // TODO: +- may not work for non latin languages
3b8a284c 783
d4419d55 784 if (substr($searchterm,0,1) == '+') {
06c1a1da 785 $searchterm = trim($searchterm, '+-');
786 $searchterm = preg_quote($searchterm, '|');
787 $searchcond[] = "$concat $REGEXP :ss$i";
788 $params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
789
a8b56716 790 } else if (substr($searchterm,0,1) == "-") {
06c1a1da 791 $searchterm = trim($searchterm, '+-');
792 $searchterm = preg_quote($searchterm, '|');
793 $searchcond[] = "$concat $NOTREGEXP :ss$i";
794 $params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
795
a8b56716 796 } else {
47586394 797 $searchcond[] = $DB->sql_like($concat,":ss$i", false, true, $NOT);
06c1a1da 798 $params['ss'.$i] = "%$searchterm%";
a8b56716 799 }
02ebf404 800 }
801
06c1a1da 802 if (empty($searchcond)) {
235ef57a 803 $searchcond = array('1 = 1');
06c1a1da 804 }
805
806 $searchcond = implode(" AND ", $searchcond);
807
afa559e9
EL
808 $courses = array();
809 $c = 0; // counts how many visible courses we've seen
810
811 // Tiki pagination
812 $limitfrom = $page * $recordsperpage;
813 $limitto = $limitfrom + $recordsperpage;
814
2e4c0c91
FM
815 $ccselect = ', ' . context_helper::get_preload_record_columns_sql('ctx');
816 $ccjoin = "LEFT JOIN {context} ctx ON (ctx.instanceid = c.id AND ctx.contextlevel = :contextlevel)";
817 $params['contextlevel'] = CONTEXT_COURSE;
818
4a3fb71c 819 $sql = "SELECT c.* $ccselect
3b8a284c 820 FROM {course} c
4f0c2d00 821 $ccjoin
06c1a1da 822 WHERE $searchcond AND c.id <> ".SITEID."
823 ORDER BY $sort";
2c64f65c 824
afa559e9
EL
825 $rs = $DB->get_recordset_sql($sql, $params);
826 foreach($rs as $course) {
235ef57a
DW
827 // Preload contexts only for hidden courses or courses we need to return.
828 context_helper::preload_from_record($course);
829 $coursecontext = context_course::instance($course->id);
830 if (!$course->visible && !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
831 continue;
832 }
833 if (!empty($requiredcapabilities)) {
834 if (!has_all_capabilities($requiredcapabilities, $coursecontext)) {
93c544bd 835 continue;
02ebf404 836 }
837 }
93c544bd
MG
838 // Don't exit this loop till the end
839 // we need to count all the visible courses
840 // to update $totalcount
841 if ($c >= $limitfrom && $c < $limitto) {
842 $courses[$course->id] = $course;
843 }
844 $c++;
02ebf404 845 }
afa559e9 846 $rs->close();
02ebf404 847
2c64f65c 848 // our caller expects 2 bits of data - our return
849 // array, and an updated $totalcount
850 $totalcount = $c;
02ebf404 851 return $courses;
852}
853
0cbe8111 854/**
855 * Fixes course category and course sortorder, also verifies category and course parents and paths.
a1b892cc 856 * (circular references are not fixed)
3564771d 857 *
858 * @global object
859 * @global object
860 * @uses MAX_COURSES_IN_CATEGORY
861 * @uses MAX_COURSE_CATEGORIES
862 * @uses SITEID
863 * @uses CONTEXT_COURSE
864 * @return void
0cbe8111 865 */
866function fix_course_sortorder() {
867 global $DB, $SITE;
868
869 //WARNING: this is PHP5 only code!
870
eabbfa82
MG
871 // if there are any changes made to courses or categories we will trigger
872 // the cache events to purge all cached courses/categories data
873 $cacheevents = array();
874
0cbe8111 875 if ($unsorted = $DB->get_records('course_categories', array('sortorder'=>0))) {
876 //move all categories that are not sorted yet to the end
877 $DB->set_field('course_categories', 'sortorder', MAX_COURSES_IN_CATEGORY*MAX_COURSE_CATEGORIES, array('sortorder'=>0));
eabbfa82 878 $cacheevents['changesincoursecat'] = true;
0cbe8111 879 }
880
881 $allcats = $DB->get_records('course_categories', null, 'sortorder, id', 'id, sortorder, parent, depth, path');
882 $topcats = array();
883 $brokencats = array();
884 foreach ($allcats as $cat) {
885 $sortorder = (int)$cat->sortorder;
886 if (!$cat->parent) {
887 while(isset($topcats[$sortorder])) {
888 $sortorder++;
889 }
890 $topcats[$sortorder] = $cat;
891 continue;
892 }
893 if (!isset($allcats[$cat->parent])) {
894 $brokencats[] = $cat;
895 continue;
c5d13b68 896 }
0cbe8111 897 if (!isset($allcats[$cat->parent]->children)) {
898 $allcats[$cat->parent]->children = array();
c5d13b68 899 }
0cbe8111 900 while(isset($allcats[$cat->parent]->children[$sortorder])) {
901 $sortorder++;
902 }
903 $allcats[$cat->parent]->children[$sortorder] = $cat;
f41ef63e 904 }
0cbe8111 905 unset($allcats);
39f65595 906
0cbe8111 907 // add broken cats to category tree
908 if ($brokencats) {
909 $defaultcat = reset($topcats);
910 foreach ($brokencats as $cat) {
911 $topcats[] = $cat;
a1b892cc 912 }
ba87a4da 913 }
914
0cbe8111 915 // now walk recursively the tree and fix any problems found
916 $sortorder = 0;
917 $fixcontexts = array();
eabbfa82
MG
918 if (_fix_course_cats($topcats, $sortorder, 0, 0, '', $fixcontexts)) {
919 $cacheevents['changesincoursecat'] = true;
920 }
0cbe8111 921
922 // detect if there are "multiple" frontpage courses and fix them if needed
923 $frontcourses = $DB->get_records('course', array('category'=>0), 'id');
924 if (count($frontcourses) > 1) {
925 if (isset($frontcourses[SITEID])) {
926 $frontcourse = $frontcourses[SITEID];
927 unset($frontcourses[SITEID]);
928 } else {
929 $frontcourse = array_shift($frontcourses);
930 }
931 $defaultcat = reset($topcats);
932 foreach ($frontcourses as $course) {
933 $DB->set_field('course', 'category', $defaultcat->id, array('id'=>$course->id));
b0c6dc1c 934 $context = context_course::instance($course->id);
0cbe8111 935 $fixcontexts[$context->id] = $context;
eabbfa82 936 $cacheevents['changesincourse'] = true;
0cbe8111 937 }
938 unset($frontcourses);
939 } else {
940 $frontcourse = reset($frontcourses);
814748c9 941 }
942
0cbe8111 943 // now fix the paths and depths in context table if needed
944 if ($fixcontexts) {
e922fe23
PS
945 foreach ($fixcontexts as $fixcontext) {
946 $fixcontext->reset_paths(false);
947 }
948 context_helper::build_all_paths(false);
949 unset($fixcontexts);
eabbfa82
MG
950 $cacheevents['changesincourse'] = true;
951 $cacheevents['changesincoursecat'] = true;
39f65595 952 }
5930cded 953
0cbe8111 954 // release memory
955 unset($topcats);
956 unset($brokencats);
957 unset($fixcontexts);
958
959 // fix frontpage course sortorder
960 if ($frontcourse->sortorder != 1) {
961 $DB->set_field('course', 'sortorder', 1, array('id'=>$frontcourse->id));
eabbfa82 962 $cacheevents['changesincourse'] = true;
39f65595 963 }
964
0cbe8111 965 // now fix the course counts in category records if needed
966 $sql = "SELECT cc.id, cc.coursecount, COUNT(c.id) AS newcount
967 FROM {course_categories} cc
968 LEFT JOIN {course} c ON c.category = cc.id
969 GROUP BY cc.id, cc.coursecount
970 HAVING cc.coursecount <> COUNT(c.id)";
ba87a4da 971
0cbe8111 972 if ($updatecounts = $DB->get_records_sql($sql)) {
3acbe663
DC
973 // categories with more courses than MAX_COURSES_IN_CATEGORY
974 $categories = array();
0cbe8111 975 foreach ($updatecounts as $cat) {
976 $cat->coursecount = $cat->newcount;
3acbe663
DC
977 if ($cat->coursecount >= MAX_COURSES_IN_CATEGORY) {
978 $categories[] = $cat->id;
979 }
0cbe8111 980 unset($cat->newcount);
981 $DB->update_record_raw('course_categories', $cat, true);
a1b892cc 982 }
3acbe663
DC
983 if (!empty($categories)) {
984 $str = implode(', ', $categories);
985 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);
986 }
eabbfa82 987 $cacheevents['changesincoursecat'] = true;
02ebf404 988 }
8f0cd6ef 989
0cbe8111 990 // now make sure that sortorders in course table are withing the category sortorder ranges
8ed5dd63 991 $sql = "SELECT DISTINCT cc.id, cc.sortorder
0cbe8111 992 FROM {course_categories} cc
993 JOIN {course} c ON c.category = cc.id
994 WHERE c.sortorder < cc.sortorder OR c.sortorder > cc.sortorder + ".MAX_COURSES_IN_CATEGORY;
995
996 if ($fixcategories = $DB->get_records_sql($sql)) {
997 //fix the course sortorder ranges
998 foreach ($fixcategories as $cat) {
999 $sql = "UPDATE {course}
78a0635c 1000 SET sortorder = ".$DB->sql_modulo('sortorder', MAX_COURSES_IN_CATEGORY)." + ?
0cbe8111 1001 WHERE category = ?";
1002 $DB->execute($sql, array($cat->sortorder, $cat->id));
1003 }
eabbfa82 1004 $cacheevents['changesincoursecat'] = true;
814748c9 1005 }
0cbe8111 1006 unset($fixcategories);
1007
1008 // categories having courses with sortorder duplicates or having gaps in sortorder
1009 $sql = "SELECT DISTINCT c1.category AS id , cc.sortorder
1010 FROM {course} c1
1011 JOIN {course} c2 ON c1.sortorder = c2.sortorder
1012 JOIN {course_categories} cc ON (c1.category = cc.id)
1013 WHERE c1.id <> c2.id";
1014 $fixcategories = $DB->get_records_sql($sql);
1015
1016 $sql = "SELECT cc.id, cc.sortorder, cc.coursecount, MAX(c.sortorder) AS maxsort, MIN(c.sortorder) AS minsort
1017 FROM {course_categories} cc
1018 JOIN {course} c ON c.category = cc.id
1019 GROUP BY cc.id, cc.sortorder, cc.coursecount
1020 HAVING (MAX(c.sortorder) <> cc.sortorder + cc.coursecount) OR (MIN(c.sortorder) <> cc.sortorder + 1)";
1021 $gapcategories = $DB->get_records_sql($sql);
1022
1023 foreach ($gapcategories as $cat) {
1024 if (isset($fixcategories[$cat->id])) {
1025 // duplicates detected already
1026
1027 } else if ($cat->minsort == $cat->sortorder and $cat->maxsort == $cat->sortorder + $cat->coursecount - 1) {
1028 // easy - new course inserted with sortorder 0, the rest is ok
1029 $sql = "UPDATE {course}
1030 SET sortorder = sortorder + 1
1031 WHERE category = ?";
1032 $DB->execute($sql, array($cat->id));
758b9a4d 1033
0cbe8111 1034 } else {
1035 // it needs full resorting
1036 $fixcategories[$cat->id] = $cat;
6bc502cc 1037 }
eabbfa82 1038 $cacheevents['changesincourse'] = true;
6bc502cc 1039 }
0cbe8111 1040 unset($gapcategories);
8f0cd6ef 1041
0cbe8111 1042 // fix course sortorders in problematic categories only
1043 foreach ($fixcategories as $cat) {
1044 $i = 1;
1045 $courses = $DB->get_records('course', array('category'=>$cat->id), 'sortorder ASC, id DESC', 'id, sortorder');
1046 foreach ($courses as $course) {
1047 if ($course->sortorder != $cat->sortorder + $i) {
1048 $course->sortorder = $cat->sortorder + $i;
a1b892cc 1049 $DB->update_record_raw('course', $course, true);
eabbfa82 1050 $cacheevents['changesincourse'] = true;
0cbe8111 1051 }
1052 $i++;
1053 }
1054 }
b33389d2 1055
eabbfa82
MG
1056 // advise all caches that need to be rebuilt
1057 foreach (array_keys($cacheevents) as $event) {
1058 cache_helper::purge_by_event($event);
1059 }
02ebf404 1060}
1061
d8634192 1062/**
0cbe8111 1063 * Internal recursive category verification function, do not use directly!
3564771d 1064 *
1065 * @todo Document the arguments of this function better
1066 *
1067 * @global object
1068 * @uses MAX_COURSES_IN_CATEGORY
1069 * @uses CONTEXT_COURSECAT
1070 * @param array $children
1071 * @param int $sortorder
1072 * @param string $parent
1073 * @param int $depth
1074 * @param string $path
1075 * @param array $fixcontexts
eabbfa82 1076 * @return bool if changes were made
0cbe8111 1077 */
1078function _fix_course_cats($children, &$sortorder, $parent, $depth, $path, &$fixcontexts) {
c3df0901 1079 global $DB;
d8634192 1080
0cbe8111 1081 $depth++;
eabbfa82 1082 $changesmade = false;
c3df0901 1083
0cbe8111 1084 foreach ($children as $cat) {
1085 $sortorder = $sortorder + MAX_COURSES_IN_CATEGORY;
1086 $update = false;
1087 if ($parent != $cat->parent or $depth != $cat->depth or $path.'/'.$cat->id != $cat->path) {
1088 $cat->parent = $parent;
1089 $cat->depth = $depth;
1090 $cat->path = $path.'/'.$cat->id;
1091 $update = true;
c3df0901 1092
0cbe8111 1093 // make sure context caches are rebuild and dirty contexts marked
b0c6dc1c 1094 $context = context_coursecat::instance($cat->id);
0cbe8111 1095 $fixcontexts[$context->id] = $context;
1096 }
1097 if ($cat->sortorder != $sortorder) {
1098 $cat->sortorder = $sortorder;
1099 $update = true;
1100 }
1101 if ($update) {
1102 $DB->update_record('course_categories', $cat, true);
eabbfa82 1103 $changesmade = true;
0cbe8111 1104 }
1105 if (isset($cat->children)) {
eabbfa82
MG
1106 if (_fix_course_cats($cat->children, $sortorder, $cat->id, $cat->depth, $cat->path, $fixcontexts)) {
1107 $changesmade = true;
1108 }
d8634192 1109 }
1110 }
eabbfa82 1111 return $changesmade;
d8634192 1112}
1113
db4b12eb 1114/**
1115 * List of remote courses that a user has access to via MNET.
1116 * Works only on the IDP
1117 *
3564771d 1118 * @global object
1119 * @global object
1120 * @param int @userid The user id to get remote courses for
1121 * @return array Array of {@link $COURSE} of course objects
db4b12eb 1122 */
1123function get_my_remotecourses($userid=0) {
c3df0901 1124 global $DB, $USER;
db4b12eb 1125
1126 if (empty($userid)) {
1127 $userid = $USER->id;
1128 }
1129
c6575bef
DM
1130 // we can not use SELECT DISTINCT + text field (summary) because of MS SQL and Oracle, subselect used therefore
1131 $sql = "SELECT c.id, c.remoteid, c.shortname, c.fullname,
152a2273 1132 c.hostid, c.summary, c.summaryformat, c.categoryname AS cat_name,
86dd62a7 1133 h.name AS hostname
152a2273 1134 FROM {mnetservice_enrol_courses} c
c6575bef
DM
1135 JOIN (SELECT DISTINCT hostid, remotecourseid
1136 FROM {mnetservice_enrol_enrolments}
1137 WHERE userid = ?
1138 ) e ON (e.hostid = c.hostid AND e.remotecourseid = c.remoteid)
1139 JOIN {mnet_host} h ON h.id = c.hostid";
db4b12eb 1140
c3df0901 1141 return $DB->get_records_sql($sql, array($userid));
db4b12eb 1142}
1143
1144/**
1145 * List of remote hosts that a user has access to via MNET.
1146 * Works on the SP
1147 *
3564771d 1148 * @global object
1149 * @global object
1150 * @return array|bool Array of host objects or false
db4b12eb 1151 */
1152function get_my_remotehosts() {
1153 global $CFG, $USER;
1154
1155 if ($USER->mnethostid == $CFG->mnet_localhost_id) {
1156 return false; // Return nothing on the IDP
1157 }
1158 if (!empty($USER->mnet_foreign_host_array) && is_array($USER->mnet_foreign_host_array)) {
1159 return $USER->mnet_foreign_host_array;
1160 }
1161 return false;
1162}
fbc21ae8 1163
18a97fd8 1164/**
fbc21ae8 1165 * This function creates a default separated/connected scale
1166 *
1167 * This function creates a default separated/connected scale
1168 * so there's something in the database. The locations of
1169 * strings and files is a bit odd, but this is because we
1170 * need to maintain backward compatibility with many different
1171 * existing language translations and older sites.
3564771d 1172 *
1173 * @global object
3564771d 1174 * @return void
fbc21ae8 1175 */
02ebf404 1176function make_default_scale() {
2d0f7da8 1177 global $DB;
02ebf404 1178
b85b25eb 1179 $defaultscale = new stdClass();
02ebf404 1180 $defaultscale->courseid = 0;
1181 $defaultscale->userid = 0;
d4419d55 1182 $defaultscale->name = get_string('separateandconnected');
2d0f7da8 1183 $defaultscale->description = get_string('separateandconnectedinfo');
d4419d55 1184 $defaultscale->scale = get_string('postrating1', 'forum').','.
1185 get_string('postrating2', 'forum').','.
1186 get_string('postrating3', 'forum');
02ebf404 1187 $defaultscale->timemodified = time();
1188
a9637e7d
PS
1189 $defaultscale->id = $DB->insert_record('scale', $defaultscale);
1190 $DB->execute("UPDATE {forum} SET scale = ?", array($defaultscale->id));
02ebf404 1191}
1192
fbc21ae8 1193
18a97fd8 1194/**
fbc21ae8 1195 * Returns a menu of all available scales from the site as well as the given course
1196 *
3564771d 1197 * @global object
fbc21ae8 1198 * @param int $courseid The id of the course as found in the 'course' table.
3564771d 1199 * @return array
fbc21ae8 1200 */
02ebf404 1201function get_scales_menu($courseid=0) {
c3df0901 1202 global $DB;
02ebf404 1203
c3df0901 1204 $sql = "SELECT id, name
1205 FROM {scale}
1206 WHERE courseid = 0 or courseid = ?
02ebf404 1207 ORDER BY courseid ASC, name ASC";
c3df0901 1208 $params = array($courseid);
02ebf404 1209
c3df0901 1210 if ($scales = $DB->get_records_sql_menu($sql, $params)) {
02ebf404 1211 return $scales;
1212 }
1213
1214 make_default_scale();
1215
c3df0901 1216 return $DB->get_records_sql_menu($sql, $params);
02ebf404 1217}
1218
d82993dc
PS
1219/**
1220 * Increment standard revision field.
1221 *
1222 * The revision are based on current time and are incrementing.
1223 * There is a protection for runaway revisions, it may not go further than
1224 * one hour into future.
1225 *
1226 * The field has to be XMLDB_TYPE_INTEGER with size 10.
1227 *
1228 * @param string $table
1229 * @param string $field name of the field containing revision
1230 * @param string $select use empty string when updating all records
1231 * @param array $params optional select parameters
1232 */
1233function increment_revision_number($table, $field, $select, array $params = null) {
1234 global $DB;
1235
1236 $now = time();
1237 $sql = "UPDATE {{$table}}
1238 SET $field = (CASE
1239 WHEN $field IS NULL THEN $now
1240 WHEN $field < $now THEN $now
1241 WHEN $field > $now + 3600 THEN $now
1242 ELSE $field + 1 END)";
1243 if ($select) {
1244 $sql = $sql . " WHERE $select";
1245 }
1246 $DB->execute($sql, $params);
1247}
1248
5baa0ad6 1249
df28d6c5 1250/// MODULE FUNCTIONS /////////////////////////////////////////////////
1251
18a97fd8 1252/**
fbc21ae8 1253 * Just gets a raw list of all modules in a course
1254 *
3564771d 1255 * @global object
fbc21ae8 1256 * @param int $courseid The id of the course as found in the 'course' table.
3564771d 1257 * @return array
fbc21ae8 1258 */
9fa49e22 1259function get_course_mods($courseid) {
c3df0901 1260 global $DB;
9fa49e22 1261
3a11c548 1262 if (empty($courseid)) {
1263 return false; // avoid warnings
1264 }
1265
c3df0901 1266 return $DB->get_records_sql("SELECT cm.*, m.name as modname
1267 FROM {modules} m, {course_modules} cm
1268 WHERE cm.course = ? AND cm.module = m.id AND m.visible = 1",
1269 array($courseid)); // no disabled mods
9fa49e22 1270}
1271
fbc21ae8 1272
18a97fd8 1273/**
f9d5371b 1274 * Given an id of a course module, finds the coursemodule description
fbc21ae8 1275 *
92e2e855
MG
1276 * Please note that this function performs 1-2 DB queries. When possible use cached
1277 * course modinfo. For example get_fast_modinfo($courseorid)->get_cm($cmid)
1278 * See also {@link cm_info::get_course_module_record()}
1279 *
3564771d 1280 * @global object
a1b892cc 1281 * @param string $modulename name of module type, eg. resource, assignment,... (optional, slower and less safe if not specified)
f9d5371b 1282 * @param int $cmid course module id (id in course_modules table)
1283 * @param int $courseid optional course id for extra validation
a1b892cc 1284 * @param bool $sectionnum include relative section number (0,1,2 ...)
4fea29e4 1285 * @param int $strictness IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found;
1286 * IGNORE_MULTIPLE means return first, ignore multiple records found(not recommended);
1287 * MUST_EXIST means throw exception if no record or multiple records found
83be47e6 1288 * @return stdClass
f9d5371b 1289 */
4fea29e4 1290function get_coursemodule_from_id($modulename, $cmid, $courseid=0, $sectionnum=false, $strictness=IGNORE_MISSING) {
c3df0901 1291 global $DB;
f9d5371b 1292
a1b892cc 1293 $params = array('cmid'=>$cmid);
1294
1295 if (!$modulename) {
1296 if (!$modulename = $DB->get_field_sql("SELECT md.name
1297 FROM {modules} md
1298 JOIN {course_modules} cm ON cm.module = md.id
4fea29e4 1299 WHERE cm.id = :cmid", $params, $strictness)) {
a1b892cc 1300 return false;
1301 }
b6f299bb
PS
1302 } else {
1303 if (!core_component::is_valid_plugin_name('mod', $modulename)) {
1304 throw new coding_exception('Invalid modulename parameter');
1305 }
a1b892cc 1306 }
1307
1308 $params['modulename'] = $modulename;
1309
d251907c 1310 $courseselect = "";
a1b892cc 1311 $sectionfield = "";
1312 $sectionjoin = "";
f9d5371b 1313
c3df0901 1314 if ($courseid) {
a1b892cc 1315 $courseselect = "AND cm.course = :courseid";
c3df0901 1316 $params['courseid'] = $courseid;
d251907c 1317 }
c3df0901 1318
a1b892cc 1319 if ($sectionnum) {
1320 $sectionfield = ", cw.section AS sectionnum";
1321 $sectionjoin = "LEFT JOIN {course_sections} cw ON cw.id = cm.section";
1322 }
1323
1324 $sql = "SELECT cm.*, m.name, md.name AS modname $sectionfield
1325 FROM {course_modules} cm
1326 JOIN {modules} md ON md.id = cm.module
1327 JOIN {".$modulename."} m ON m.id = cm.instance
1328 $sectionjoin
1329 WHERE cm.id = :cmid AND md.name = :modulename
1330 $courseselect";
1331
4fea29e4 1332 return $DB->get_record_sql($sql, $params, $strictness);
f9d5371b 1333}
1334
1335/**
1336 * Given an instance number of a module, finds the coursemodule description
1337 *
92e2e855
MG
1338 * Please note that this function performs DB query. When possible use cached course
1339 * modinfo. For example get_fast_modinfo($courseorid)->instances[$modulename][$instance]
1340 * See also {@link cm_info::get_course_module_record()}
1341 *
3564771d 1342 * @global object
f9d5371b 1343 * @param string $modulename name of module type, eg. resource, assignment,...
1344 * @param int $instance module instance number (id in resource, assignment etc. table)
1345 * @param int $courseid optional course id for extra validation
a1b892cc 1346 * @param bool $sectionnum include relative section number (0,1,2 ...)
4fea29e4 1347 * @param int $strictness IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found;
1348 * IGNORE_MULTIPLE means return first, ignore multiple records found(not recommended);
1349 * MUST_EXIST means throw exception if no record or multiple records found
83be47e6 1350 * @return stdClass
fbc21ae8 1351 */
4fea29e4 1352function get_coursemodule_from_instance($modulename, $instance, $courseid=0, $sectionnum=false, $strictness=IGNORE_MISSING) {
c3df0901 1353 global $DB;
df28d6c5 1354
b6f299bb
PS
1355 if (!core_component::is_valid_plugin_name('mod', $modulename)) {
1356 throw new coding_exception('Invalid modulename parameter');
1357 }
1358
a1b892cc 1359 $params = array('instance'=>$instance, 'modulename'=>$modulename);
1360
d251907c 1361 $courseselect = "";
a1b892cc 1362 $sectionfield = "";
1363 $sectionjoin = "";
df28d6c5 1364
c3df0901 1365 if ($courseid) {
a1b892cc 1366 $courseselect = "AND cm.course = :courseid";
c3df0901 1367 $params['courseid'] = $courseid;
d251907c 1368 }
c3df0901 1369
a1b892cc 1370 if ($sectionnum) {
1371 $sectionfield = ", cw.section AS sectionnum";
1372 $sectionjoin = "LEFT JOIN {course_sections} cw ON cw.id = cm.section";
1373 }
1374
1375 $sql = "SELECT cm.*, m.name, md.name AS modname $sectionfield
1376 FROM {course_modules} cm
1377 JOIN {modules} md ON md.id = cm.module
1378 JOIN {".$modulename."} m ON m.id = cm.instance
1379 $sectionjoin
1380 WHERE m.id = :instance AND md.name = :modulename
1381 $courseselect";
df28d6c5 1382
4fea29e4 1383 return $DB->get_record_sql($sql, $params, $strictness);
df28d6c5 1384}
1385
dd97c328 1386/**
1387 * Returns all course modules of given activity in course
3564771d 1388 *
1389 * @param string $modulename The module name (forum, quiz, etc.)
1390 * @param int $courseid The course id to get modules for
dd97c328 1391 * @param string $extrafields extra fields starting with m.
3564771d 1392 * @return array Array of results
dd97c328 1393 */
1394function get_coursemodules_in_course($modulename, $courseid, $extrafields='') {
c3df0901 1395 global $DB;
dd97c328 1396
b6f299bb
PS
1397 if (!core_component::is_valid_plugin_name('mod', $modulename)) {
1398 throw new coding_exception('Invalid modulename parameter');
1399 }
1400
dd97c328 1401 if (!empty($extrafields)) {
1402 $extrafields = ", $extrafields";
1403 }
c3df0901 1404 $params = array();
1405 $params['courseid'] = $courseid;
1406 $params['modulename'] = $modulename;
1407
1408
1409 return $DB->get_records_sql("SELECT cm.*, m.name, md.name as modname $extrafields
1410 FROM {course_modules} cm, {modules} md, {".$modulename."} m
1411 WHERE cm.course = :courseid AND
1412 cm.instance = m.id AND
1413 md.name = :modulename AND
e0985504 1414 md.id = cm.module", $params);
dd97c328 1415}
ac0b1a19 1416
185cfb09 1417/**
1418 * Returns an array of all the active instances of a particular module in given courses, sorted in the order they are defined
1419 *
1420 * Returns an array of all the active instances of a particular
1421 * module in given courses, sorted in the order they are defined
ac0b1a19 1422 * in the course. Returns an empty array on any errors.
185cfb09 1423 *
ac0b1a19 1424 * The returned objects includle the columns cw.section, cm.visible,
061e6b28 1425 * cm.groupmode, and cm.groupingid, and are indexed by cm.id.
ac0b1a19 1426 *
3564771d 1427 * @global object
1428 * @global object
ac0b1a19 1429 * @param string $modulename The name of the module to get instances for
1430 * @param array $courses an array of course objects.
3564771d 1431 * @param int $userid
1432 * @param int $includeinvisible
ac0b1a19 1433 * @return array of module instance objects, including some extra fields from the course_modules
1434 * and course_sections tables, or an empty array if an error occurred.
185cfb09 1435 */
00e12c73 1436function get_all_instances_in_courses($modulename, $courses, $userid=NULL, $includeinvisible=false) {
c3df0901 1437 global $CFG, $DB;
ac0b1a19 1438
b6f299bb
PS
1439 if (!core_component::is_valid_plugin_name('mod', $modulename)) {
1440 throw new coding_exception('Invalid modulename parameter');
1441 }
1442
ac0b1a19 1443 $outputarray = array();
1444
185cfb09 1445 if (empty($courses) || !is_array($courses) || count($courses) == 0) {
ac0b1a19 1446 return $outputarray;
185cfb09 1447 }
ac0b1a19 1448
c3df0901 1449 list($coursessql, $params) = $DB->get_in_or_equal(array_keys($courses), SQL_PARAMS_NAMED, 'c0');
1450 $params['modulename'] = $modulename;
1451
1452 if (!$rawmods = $DB->get_records_sql("SELECT cm.id AS coursemodule, m.*, cw.section, cm.visible AS visible,
061e6b28 1453 cm.groupmode, cm.groupingid
c3df0901 1454 FROM {course_modules} cm, {course_sections} cw, {modules} md,
1455 {".$modulename."} m
1456 WHERE cm.course $coursessql AND
1457 cm.instance = m.id AND
1458 cm.section = cw.id AND
1459 md.name = :modulename AND
1460 md.id = cm.module", $params)) {
ac0b1a19 1461 return $outputarray;
185cfb09 1462 }
1463
185cfb09 1464 foreach ($courses as $course) {
ac0b1a19 1465 $modinfo = get_fast_modinfo($course, $userid);
fea43a7f 1466
ac0b1a19 1467 if (empty($modinfo->instances[$modulename])) {
185cfb09 1468 continue;
1469 }
ac0b1a19 1470
1471 foreach ($modinfo->instances[$modulename] as $cm) {
1472 if (!$includeinvisible and !$cm->uservisible) {
1473 continue;
1474 }
1475 if (!isset($rawmods[$cm->id])) {
1476 continue;
185cfb09 1477 }
ac0b1a19 1478 $instance = $rawmods[$cm->id];
1479 if (!empty($cm->extra)) {
9a9012dc 1480 $instance->extra = $cm->extra;
ac0b1a19 1481 }
1482 $outputarray[] = $instance;
185cfb09 1483 }
1484 }
1485
1486 return $outputarray;
185cfb09 1487}
fbc21ae8 1488
18a97fd8 1489/**
3d96cba7 1490 * Returns an array of all the active instances of a particular module in a given course,
1491 * sorted in the order they are defined.
fbc21ae8 1492 *
1493 * Returns an array of all the active instances of a particular
1494 * module in a given course, sorted in the order they are defined
3d96cba7 1495 * in the course. Returns an empty array on any errors.
1496 *
1497 * The returned objects includle the columns cw.section, cm.visible,
061e6b28 1498 * cm.groupmode, and cm.groupingid, and are indexed by cm.id.
fbc21ae8 1499 *
3564771d 1500 * Simply calls {@link all_instances_in_courses()} with a single provided course
1501 *
3d96cba7 1502 * @param string $modulename The name of the module to get instances for
ac0b1a19 1503 * @param object $course The course obect.
3d96cba7 1504 * @return array of module instance objects, including some extra fields from the course_modules
1505 * and course_sections tables, or an empty array if an error occurred.
3564771d 1506 * @param int $userid
1507 * @param int $includeinvisible
fbc21ae8 1508 */
00e12c73 1509function get_all_instances_in_course($modulename, $course, $userid=NULL, $includeinvisible=false) {
ac0b1a19 1510 return get_all_instances_in_courses($modulename, array($course->id => $course), $userid, $includeinvisible);
df28d6c5 1511}
1512
9fa49e22 1513
18a97fd8 1514/**
fbc21ae8 1515 * Determine whether a module instance is visible within a course
1516 *
1517 * Given a valid module object with info about the id and course,
1518 * and the module's type (eg "forum") returns whether the object
061e6b28 1519 * is visible or not according to the 'eye' icon only.
fbc21ae8 1520 *
8d1f33e1 1521 * NOTE: This does NOT take into account visibility to a particular user.
1522 * To get visibility access for a specific user, use get_fast_modinfo, get a
1523 * cm_info object from this, and check the ->uservisible property; or use
1524 * the \core_availability\info_module::is_user_visible() static function.
1525 *
3564771d 1526 * @global object
117bd748 1527
613bbd7c 1528 * @param $moduletype Name of the module eg 'forum'
1529 * @param $module Object which is the instance of the module
3564771d 1530 * @return bool Success
fbc21ae8 1531 */
580f2fbc 1532function instance_is_visible($moduletype, $module) {
c3df0901 1533 global $DB;
580f2fbc 1534
2b49ae96 1535 if (!empty($module->id)) {
d251907c 1536 $params = array('courseid'=>$module->course, 'moduletype'=>$moduletype, 'moduleid'=>$module->id);
061e6b28 1537 if ($records = $DB->get_records_sql("SELECT cm.instance, cm.visible, cm.groupingid, cm.id, cm.course
c3df0901 1538 FROM {course_modules} cm, {modules} m
1539 WHERE cm.course = :courseid AND
1540 cm.module = m.id AND
1541 m.name = :moduletype AND
f93ea222 1542 cm.instance = :moduleid", $params)) {
5930cded 1543
2b49ae96 1544 foreach ($records as $record) { // there should only be one - use the first one
dd97c328 1545 return $record->visible;
2b49ae96 1546 }
580f2fbc 1547 }
1548 }
580f2fbc 1549 return true; // visible by default!
1550}
1551
a3fb1c45 1552
9fa49e22 1553/// LOG FUNCTIONS /////////////////////////////////////////////////////
1554
7eaca5a8
1555/**
1556 * Get instance of log manager.
1557 *
1558 * @param bool $forcereload
1559 * @return \core\log\manager
1560 */
1561function get_log_manager($forcereload = false) {
1562 /** @var \core\log\manager $singleton */
1563 static $singleton = null;
1564
1565 if ($forcereload and isset($singleton)) {
1566 $singleton->dispose();
1567 $singleton = null;
1568 }
1569
1570 if (isset($singleton)) {
1571 return $singleton;
1572 }
1573
1574 $classname = '\tool_log\log\manager';
1575 if (defined('LOG_MANAGER_CLASS')) {
1576 $classname = LOG_MANAGER_CLASS;
1577 }
1578
1579 if (!class_exists($classname)) {
1580 if (!empty($classname)) {
1581 debugging("Cannot find log manager class '$classname'.", DEBUG_DEVELOPER);
1582 }
1583 $classname = '\core\log\dummy_manager';
1584 }
1585
1586 $singleton = new $classname();
1587 return $singleton;
1588}
1589
b8b50d04
AD
1590/**
1591 * Add an entry to the config log table.
1592 *
1593 * These are "action" focussed rather than web server hits,
1594 * and provide a way to easily reconstruct changes to Moodle configuration.
1595 *
1596 * @package core
1597 * @category log
1598 * @global moodle_database $DB
1599 * @global stdClass $USER
1600 * @param string $name The name of the configuration change action
1601 For example 'filter_active' when activating or deactivating a filter
1602 * @param string $oldvalue The config setting's previous value
1603 * @param string $value The config setting's new value
1604 * @param string $plugin Plugin name, for example a filter name when changing filter configuration
1605 * @return void
1606 */
1607function add_to_config_log($name, $oldvalue, $value, $plugin) {
1608 global $USER, $DB;
1609
1610 $log = new stdClass();
1611 $log->userid = during_initial_install() ? 0 :$USER->id; // 0 as user id during install
1612 $log->timemodified = time();
1613 $log->name = $name;
1614 $log->oldvalue = $oldvalue;
1615 $log->value = $value;
1616 $log->plugin = $plugin;
1617 $DB->insert_record('config_log', $log);
1618}
9fa49e22 1619
341b5ed2 1620/**
1621 * Store user last access times - called when use enters a course or site
1622 *
04252d3a
AKA
1623 * @package core
1624 * @category log
1625 * @global stdClass $USER
1626 * @global stdClass $CFG
1627 * @global moodle_database $DB
3564771d 1628 * @uses LASTACCESS_UPDATE_SECS
1629 * @uses SITEID
fcf64900 1630 * @param int $courseid empty courseid means site
341b5ed2 1631 * @return void
1632 */
1633function user_accesstime_log($courseid=0) {
f33e1ed4 1634 global $USER, $CFG, $DB;
341b5ed2 1635
d79d5ac2 1636 if (!isloggedin() or \core\session\manager::is_loggedinas()) {
341b5ed2 1637 // no access tracking
1638 return;
1639 }
1640
4501a081
DP
1641 if (isguestuser()) {
1642 // Do not update guest access times/ips for performance.
1643 return;
1644 }
1645
341b5ed2 1646 if (empty($courseid)) {
1647 $courseid = SITEID;
1648 }
1649
1650 $timenow = time();
1651
1652/// Store site lastaccess time for the current user
1653 if ($timenow - $USER->lastaccess > LASTACCESS_UPDATE_SECS) {
1654 /// Update $USER->lastaccess for next checks
1655 $USER->lastaccess = $timenow;
341b5ed2 1656
365a5941 1657 $last = new stdClass();
f33e1ed4 1658 $last->id = $USER->id;
1659 $last->lastip = getremoteaddr();
1660 $last->lastaccess = $timenow;
1661
68fbad44 1662 $DB->update_record_raw('user', $last);
341b5ed2 1663 }
1664
1665 if ($courseid == SITEID) {
1666 /// no user_lastaccess for frontpage
1667 return;
1668 }
cb8aaedf 1669
341b5ed2 1670/// Store course lastaccess times for the current user
1671 if (empty($USER->currentcourseaccess[$courseid]) or ($timenow - $USER->currentcourseaccess[$courseid] > LASTACCESS_UPDATE_SECS)) {
341b5ed2 1672
f33e1ed4 1673 $lastaccess = $DB->get_field('user_lastaccess', 'timeaccess', array('userid'=>$USER->id, 'courseid'=>$courseid));
341b5ed2 1674
f33e1ed4 1675 if ($lastaccess === false) {
1676 // Update course lastaccess for next checks
1677 $USER->currentcourseaccess[$courseid] = $timenow;
1678
365a5941 1679 $last = new stdClass();
f33e1ed4 1680 $last->userid = $USER->id;
1681 $last->courseid = $courseid;
1682 $last->timeaccess = $timenow;
1d293ca4
RS
1683 try {
1684 $DB->insert_record_raw('user_lastaccess', $last, false);
1685 } catch (dml_write_exception $e) {
1686 // During a race condition we can fail to find the data, then it appears.
1687 // If we still can't find it, rethrow the exception.
1688 $lastaccess = $DB->get_field('user_lastaccess', 'timeaccess', array('userid' => $USER->id,
1689 'courseid' => $courseid));
1690 if ($lastaccess === false) {
1691 throw $e;
1692 }
1693 // If we did find it, the race condition was true and another thread has inserted the time for us.
1694 // We can just continue without having to do anything.
1695 }
d251907c 1696
f33e1ed4 1697 } else if ($timenow - $lastaccess < LASTACCESS_UPDATE_SECS) {
1698 // no need to update now, it was updated recently in concurrent login ;-)
341b5ed2 1699
f33e1ed4 1700 } else {
1701 // Update course lastaccess for next checks
1702 $USER->currentcourseaccess[$courseid] = $timenow;
1703
68fbad44 1704 $DB->set_field('user_lastaccess', 'timeaccess', $timenow, array('userid'=>$USER->id, 'courseid'=>$courseid));
3d94772d 1705 }
8f0cd6ef 1706 }
9fa49e22 1707}
1708
18a97fd8 1709/**
fbc21ae8 1710 * Select all log records based on SQL criteria
1711 *
04252d3a
AKA
1712 * @package core
1713 * @category log
1714 * @global moodle_database $DB
fbc21ae8 1715 * @param string $select SQL select criteria
c3df0901 1716 * @param array $params named sql type params
fbc21ae8 1717 * @param string $order SQL order by clause to sort the records returned
fcf64900
AKA
1718 * @param string $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set)
1719 * @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set)
fbc21ae8 1720 * @param int $totalcount Passed in by reference.
04252d3a 1721 * @return array
fbc21ae8 1722 */
c3df0901 1723function get_logs($select, array $params=null, $order='l.time DESC', $limitfrom='', $limitnum='', &$totalcount) {
1724 global $DB;
9fa49e22 1725
519d369f 1726 if ($order) {
c3df0901 1727 $order = "ORDER BY $order";
1728 }
1729
1730 $selectsql = "";
1731 $countsql = "";
1732
1733 if ($select) {
1734 $select = "WHERE $select";
519d369f 1735 }
1736
c3df0901 1737 $sql = "SELECT COUNT(*)
1738 FROM {log} l
1739 $select";
1740
1741 $totalcount = $DB->count_records_sql($sql, $params);
a327f25e
AG
1742 $allnames = get_all_user_name_fields(true, 'u');
1743 $sql = "SELECT l.*, $allnames, u.picture
d251907c 1744 FROM {log} l
c3df0901 1745 LEFT JOIN {user} u ON l.userid = u.id
d251907c 1746 $select
c3df0901 1747 $order";
519d369f 1748
c3df0901 1749 return $DB->get_records_sql($sql, $params, $limitfrom, $limitnum) ;
9fa49e22 1750}
1751
519d369f 1752
18a97fd8 1753/**
fbc21ae8 1754 * Select all log records for a given course and user
1755 *
04252d3a
AKA
1756 * @package core
1757 * @category log
1758 * @global moodle_database $DB
2f87145b 1759 * @uses DAYSECS
fbc21ae8 1760 * @param int $userid The id of the user as found in the 'user' table.
1761 * @param int $courseid The id of the course as found in the 'course' table.
fcf64900 1762 * @param string $coursestart unix timestamp representing course start date and time.
04252d3a 1763 * @return array
fbc21ae8 1764 */
9fa49e22 1765function get_logs_usercourse($userid, $courseid, $coursestart) {
c3df0901 1766 global $DB;
9fa49e22 1767
c3df0901 1768 $params = array();
1769
1770 $courseselect = '';
da0c90c3 1771 if ($courseid) {
c3df0901 1772 $courseselect = "AND course = :courseid";
d251907c 1773 $params['courseid'] = $courseid;
da0c90c3 1774 }
c3df0901 1775 $params['userid'] = $userid;
cdc6938b
DM
1776 // We have to sanitize this param ourselves here instead of relying on DB.
1777 // Postgres complains if you use name parameter or column alias in GROUP BY.
1778 // See MDL-27696 and 51c3e85 for details.
1779 $coursestart = (int)$coursestart;
da0c90c3 1780
51c3e855 1781 return $DB->get_records_sql("SELECT FLOOR((time - $coursestart)/". DAYSECS .") AS day, COUNT(*) AS num
c3df0901 1782 FROM {log}
1783 WHERE userid = :userid
51c3e855
PS
1784 AND time > $coursestart $courseselect
1785 GROUP BY FLOOR((time - $coursestart)/". DAYSECS .")", $params);
9fa49e22 1786}
1787
18a97fd8 1788/**
fbc21ae8 1789 * Select all log records for a given course, user, and day
1790 *
04252d3a
AKA
1791 * @package core
1792 * @category log
1793 * @global moodle_database $DB
2f87145b 1794 * @uses HOURSECS
fbc21ae8 1795 * @param int $userid The id of the user as found in the 'user' table.
1796 * @param int $courseid The id of the course as found in the 'course' table.
fcf64900 1797 * @param string $daystart unix timestamp of the start of the day for which the logs needs to be retrived
04252d3a 1798 * @return array
fbc21ae8 1799 */
9fa49e22 1800function get_logs_userday($userid, $courseid, $daystart) {
c3df0901 1801 global $DB;
1802
51c3e855 1803 $params = array('userid'=>$userid);
9fa49e22 1804
c3df0901 1805 $courseselect = '';
7e4a6488 1806 if ($courseid) {
51c3e855
PS
1807 $courseselect = "AND course = :courseid";
1808 $params['courseid'] = $courseid;
7e4a6488 1809 }
51c3e855 1810 $daystart = (int)$daystart; // note: unfortunately pg complains if you use name parameter or column alias in GROUP BY
7e4a6488 1811
51c3e855 1812 return $DB->get_records_sql("SELECT FLOOR((time - $daystart)/". HOURSECS .") AS hour, COUNT(*) AS num
c3df0901 1813 FROM {log}
51c3e855
PS
1814 WHERE userid = :userid
1815 AND time > $daystart $courseselect
1816 GROUP BY FLOOR((time - $daystart)/". HOURSECS .") ", $params);
9fa49e22 1817}
1818
a3fb1c45 1819/// GENERAL HELPFUL THINGS ///////////////////////////////////
1820
18a97fd8 1821/**
68e550e6 1822 * Dumps a given object's information for debugging purposes
fbc21ae8 1823 *
68e550e6
DM
1824 * When used in a CLI script, the object's information is written to the standard
1825 * error output stream. When used in a web script, the object is dumped to a
1826 * pre-formatted block with the "notifytiny" CSS class.
fbc21ae8 1827 *
1828 * @param mixed $object The data to be printed
68e550e6 1829 * @return void output is echo'd
fbc21ae8 1830 */
a3fb1c45 1831function print_object($object) {
68e550e6 1832
18767260
RT
1833 // we may need a lot of memory here
1834 raise_memory_limit(MEMORY_EXTRA);
68e550e6
DM
1835
1836 if (CLI_SCRIPT) {
1837 fwrite(STDERR, print_r($object, true));
1838 fwrite(STDERR, PHP_EOL);
1839 } else {
1840 echo html_writer::tag('pre', s(print_r($object, true)), array('class' => 'notifytiny'));
1841 }
a3fb1c45 1842}
1843
62d4e774 1844/**
5930cded 1845 * This function is the official hook inside XMLDB stuff to delegate its debug to one
62d4e774 1846 * external function.
1847 *
1848 * Any script can avoid calls to this function by defining XMLDB_SKIP_DEBUG_HOOK before
1849 * using XMLDB classes. Obviously, also, if this function doesn't exist, it isn't invoked ;-)
1850 *
3564771d 1851 * @uses DEBUG_DEVELOPER
1852 * @param string $message string contains the error message
1853 * @param object $object object XMLDB object that fired the debug
62d4e774 1854 */
1855function xmldb_debug($message, $object) {
1856
92b564f4 1857 debugging($message, DEBUG_DEVELOPER);
62d4e774 1858}
1859
49860445 1860/**
3564771d 1861 * @global object
1862 * @uses CONTEXT_COURSECAT
df73f8d4 1863 * @return boolean Whether the user can create courses in any category in the system.
49860445 1864 */
1865function user_can_create_courses() {
c3df0901 1866 global $DB;
df73f8d4 1867 $catsrs = $DB->get_recordset('course_categories');
4d55255b 1868 foreach ($catsrs as $cat) {
b0c6dc1c 1869 if (has_capability('moodle/course:create', context_coursecat::instance($cat->id))) {
df73f8d4 1870 $catsrs->close();
1871 return true;
49860445 1872 }
1873 }
df73f8d4 1874 $catsrs->close();
1875 return false;
49860445 1876}
c1857269
TH
1877
1878/**
1879 * This method can update the values in mulitple database rows for a colum with
1880 * a unique index, without violating that constraint.
1881 *
1882 * Suppose we have a table with a unique index on (otherid, sortorder), and
1883 * for a particular value of otherid, we want to change all the sort orders.
1884 * You have to do this carefully or you will violate the unique index at some time.
1885 * This method takes care of the details for you.
1886 *
1887 * Note that, it is the responsibility of the caller to make sure that the
1888 * requested rename is legal. For example, if you ask for [1 => 2, 2 => 2]
1889 * then you will get a unique key violation error from the database.
1890 *
1891 * @param string $table The database table to modify.
1892 * @param string $field the field that contains the values we are going to change.
1893 * @param array $newvalues oldvalue => newvalue how to change the values.
1894 * E.g. [1 => 4, 2 => 1, 3 => 3, 4 => 2].
1895 * @param array $otherconditions array fieldname => requestedvalue extra WHERE clause
1896 * conditions to restrict which rows are affected. E.g. array('otherid' => 123).
1897 * @param int $unusedvalue (defaults to -1) a value that is never used in $ordercol.
1898 */
1899function update_field_with_unique_index($table, $field, array $newvalues,
1900 array $otherconditions, $unusedvalue = -1) {
1901 global $DB;
1902 $safechanges = decompose_update_into_safe_changes($newvalues, $unusedvalue);
1903
1904 $transaction = $DB->start_delegated_transaction();
1905 foreach ($safechanges as $change) {
1906 list($from, $to) = $change;
1907 $otherconditions[$field] = $from;
1908 $DB->set_field($table, $field, $to, $otherconditions);
1909 }
1910 $transaction->allow_commit();
1911}
1912
1913/**
1914 * Helper used by {@link update_field_with_unique_index()}. Given a desired
1915 * set of changes, break them down into single udpates that can be done one at
1916 * a time without breaking any unique index constraints.
1917 *
1918 * Suppose the input is array(1 => 2, 2 => 1) and -1. Then the output will be
1919 * array (array(1, -1), array(2, 1), array(-1, 2)). This function solves this
1920 * problem in the general case, not just for simple swaps. The unit tests give
1921 * more examples.
1922 *
1923 * Note that, it is the responsibility of the caller to make sure that the
1924 * requested rename is legal. For example, if you ask for something impossible
1925 * like array(1 => 2, 2 => 2) then the results are undefined. (You will probably
1926 * get a unique key violation error from the database later.)
1927 *
1928 * @param array $newvalues The desired re-ordering.
1929 * E.g. array(1 => 4, 2 => 1, 3 => 3, 4 => 2).
1930 * @param int $unusedvalue A value that is not currently used.
1931 * @return array A safe way to perform the re-order. An array of two-element
1932 * arrays array($from, $to).
1933 * E.g. array(array(1, -1), array(2, 1), array(4, 2), array(-1, 4)).
1934 */
1935function decompose_update_into_safe_changes(array $newvalues, $unusedvalue) {
1936 $nontrivialmap = array();
1937 foreach ($newvalues as $from => $to) {
1938 if ($from == $unusedvalue || $to == $unusedvalue) {
1939 throw new \coding_exception('Supposedly unused value ' . $unusedvalue . ' is actually used!');
1940 }
1941 if ($from != $to) {
1942 $nontrivialmap[$from] = $to;
1943 }
1944 }
1945
1946 if (empty($nontrivialmap)) {
1947 return array();
1948 }
1949
1950 // First we deal with all renames that are not part of cycles.
1951 // This bit is O(n^2) and it ought to be possible to do better,
1952 // but it does not seem worth the effort.
1953 $safechanges = array();
1954 $nontrivialmapchanged = true;
1955 while ($nontrivialmapchanged) {
1956 $nontrivialmapchanged = false;
1957
1958 foreach ($nontrivialmap as $from => $to) {
1959 if (array_key_exists($to, $nontrivialmap)) {
1960 continue; // Cannot currenly do this rename.
1961 }
1962 // Is safe to do this rename now.
1963 $safechanges[] = array($from, $to);
1964 unset($nontrivialmap[$from]);
1965 $nontrivialmapchanged = true;
1966 }
1967 }
1968
1969 // Are we done?
1970 if (empty($nontrivialmap)) {
1971 return $safechanges;
1972 }
1973
1974 // Now what is left in $nontrivialmap must be a permutation,
1975 // which must be a combination of disjoint cycles. We need to break them.
1976 while (!empty($nontrivialmap)) {
1977 // Extract the first cycle.
1978 reset($nontrivialmap);
1979 $current = $cyclestart = key($nontrivialmap);
1980 $cycle = array();
1981 do {
1982 $cycle[] = $current;
1983 $next = $nontrivialmap[$current];
1984 unset($nontrivialmap[$current]);
1985 $current = $next;
c35cf42e 1986 } while ($current != $cyclestart);
c1857269
TH
1987
1988 // Now convert it to a sequence of safe renames by using a temp.
1989 $safechanges[] = array($cyclestart, $unusedvalue);
1990 $cycle[0] = $unusedvalue;
1991 $to = $cyclestart;
1992 while ($from = array_pop($cycle)) {
1993 $safechanges[] = array($from, $to);
1994 $to = $from;
1995 }
1996 }
1997
1998 return $safechanges;
1999}