PHP search_generate_SQL函数代码示例

function search($query, $course, &$bookids, $offset, &$countentries)
{
    global $CFG, $USER, $DB;
    // Perform the search only in books fulfilling mod/book:read and (visible or moodle/course:viewhiddenactivities)
    if (empty($bookids)) {
        $bookids = book_search_get_readble_books($course);
    }
    // transform the search query into safe SQL queries
    $searchterms = explode(" ", $query);
    $parser = new search_parser();
    $lexer = new search_lexer($parser);
    if ($lexer->parse($query)) {
        $parsearray = $parser->get_parsed_array();
        list($messagesearch, $msparams) = search_generate_SQL($parsearray, 'bc.title', 'bc.content', null, null, null, null, null, null);
    }
    // Main query, only to allowed books and not hidden chapters.
    $selectsql = "SELECT DISTINCT bc.*";
    $fromsql = "  FROM {book_chapters} bc, {book} b";
    list($insql, $inparams) = $DB->get_in_or_equal($bookids, SQL_PARAMS_NAMED);
    $params = array_merge(array('courseid' => $course->id), $inparams, $msparams);
    $wheresql = "  WHERE b.course = :courseid\n                          AND b.id {$insql} \n                          AND bc.bookid = b.id \n                          AND bc.hidden = 0\n                          AND {$messagesearch} ";
    $ordersql = "  ORDER BY bc.bookid, bc.pagenum";
    // Set page limits.
    $limitfrom = $offset;
    $limitnum = 0;
    if ($offset >= 0) {
        $limitnum = BOOKMAXRESULTSPERPAGE;
    }
    $countentries = $DB->count_records_sql("select count(*) {$fromsql} {$wheresql}", $params);
    $allentries = $DB->get_records_sql("{$selectsql} {$fromsql} {$wheresql} {$ordersql}", $params, $limitfrom, $limitnum);
    return $allentries;
}

//.........这里部分代码省略.........
        if ($forum->type == 'qanda'
            && !has_capability('mod/forum:viewqandawithoutposting', $context)) {
            if (!empty($forum->onlydiscussions)) {
                list($discussionid_sql, $discussionid_params) = $DB->get_in_or_equal($forum->onlydiscussions, SQL_PARAMS_NAMED, 'qanda'.$forumid.'_');
                $params = array_merge($params, $discussionid_params);
                $select[] = "(d.id $discussionid_sql OR p.parent = 0)";
            } else {
                $select[] = "p.parent = 0";
            }
        }

        if (!empty($forum->onlygroups)) {
            list($groupid_sql, $groupid_params) = $DB->get_in_or_equal($forum->onlygroups, SQL_PARAMS_NAMED, 'grps'.$forumid.'_');
            $params = array_merge($params, $groupid_params);
            $select[] = "d.groupid $groupid_sql";
        }

        if ($select) {
            $selects = implode(" AND ", $select);
            $where[] = "(d.forum = :forum{$forumid} AND $selects)";
            $params['forum'.$forumid] = $forumid;
        } else {
            $fullaccess[] = $forumid;
        }
    }

    if ($fullaccess) {
        list($fullid_sql, $fullid_params) = $DB->get_in_or_equal($fullaccess, SQL_PARAMS_NAMED, 'fula');
        $params = array_merge($params, $fullid_params);
        $where[] = "(d.forum $fullid_sql)";
    }

    $selectdiscussion = "(".implode(" OR ", $where).")";

    $messagesearch = '';
    $searchstring = '';

    // Need to concat these back together for parser to work.
    foreach($searchterms as $searchterm){
        if ($searchstring != '') {
            $searchstring .= ' ';
        }
        $searchstring .= $searchterm;
    }

    // We need to allow quoted strings for the search. The quotes *should* be stripped
    // by the parser, but this should be examined carefully for security implications.
    $searchstring = str_replace("\\\"","\"",$searchstring);
    $parser = new search_parser();
    $lexer = new search_lexer($parser);

    if ($lexer->parse($searchstring)) {
        $parsearray = $parser->get_parsed_array();
    // Experimental feature under 1.8! MDL-8830
    // Use alternative text searches if defined
    // This feature only works under mysql until properly implemented for other DBs
    // Requires manual creation of text index for forum_posts before enabling it:
    // CREATE FULLTEXT INDEX foru_post_tix ON [prefix]forum_posts (subject, message)
    // Experimental feature under 1.8! MDL-8830
        if (!empty($CFG->forum_usetextsearches)) {
            list($messagesearch, $msparams) = search_generate_text_SQL($parsearray, 'p.message', 'p.subject',
                                                 'p.userid', 'u.id', 'u.firstname',
                                                 'u.lastname', 'p.modified', 'd.forum');
        } else {
            list($messagesearch, $msparams) = search_generate_SQL($parsearray, 'p.message', 'p.subject',
                                                 'p.userid', 'u.id', 'u.firstname',
                                                 'u.lastname', 'p.modified', 'd.forum');
        }
        $params = array_merge($params, $msparams);
    }

    $fromsql = "{forum_posts} p,
                  {forum_discussions} d,
                  {user} u";

    $selectsql = " $messagesearch
               AND p.discussion = d.id
               AND p.userid = u.id
               AND $selectdiscussion
                   $extrasql";

    $countsql = "SELECT COUNT(*)
                   FROM $fromsql
                  WHERE $selectsql";

    $searchsql = "SELECT p.*,
                         d.forum,
                         u.firstname,
                         u.lastname,
                         u.email,
                         u.picture,
                         u.imagealt
                    FROM $fromsql
                   WHERE $selectsql
                ORDER BY p.modified DESC";

    $totalcount = $DB->count_records_sql($countsql, $params);

    return $DB->get_records_sql($searchsql, $params, $limitfrom, $limitnum);
}

/**
 * Returns a list of posts found using an array of search terms.
 *
 * @global object
 * @global object
 * @global object
 * @param array $searchterms array of search terms, e.g. word +word -word
 * @param int $courseid if 0, we search through the whole site
 * @param int $limitfrom
 * @param int $limitnum
 * @param int &$totalcount
 * @param string $extrasql
 * @return array|bool Array of posts found or false
 */
function forum_search_posts($searchterms, $courseid = 0, $limitfrom = 0, $limitnum = 50, &$totalcount, $extrasql = '')
{
    global $CFG, $DB, $USER;
    require_once $CFG->libdir . '/searchlib.php';
    $forums = forum_get_readable_forums($USER->id, $courseid);
    if (count($forums) == 0) {
        $totalcount = 0;
        return false;
    }
    $now = round(time(), -2);
    // db friendly
    $fullaccess = array();
    $where = array();
    $params = array();
    foreach ($forums as $forumid => $forum) {
        $select = array();
        if (!$forum->viewhiddentimedposts) {
            $select[] = "(d.userid = :userid{$forumid} OR (d.timestart < :timestart{$forumid} AND (d.timeend = 0 OR d.timeend > :timeend{$forumid})))";
            $params = array_merge($params, array('userid' . $forumid => $USER->id, 'timestart' . $forumid => $now, 'timeend' . $forumid => $now));
        }
        $cm = $forum->cm;
        $context = $forum->context;
        if ($forum->type == 'qanda' && !has_capability('mod/forum:viewqandawithoutposting', $context)) {
            if (!empty($forum->onlydiscussions)) {
                list($discussionid_sql, $discussionid_params) = $DB->get_in_or_equal($forum->onlydiscussions, SQL_PARAMS_NAMED, 'qanda' . $forumid . '_');
                $params = array_merge($params, $discussionid_params);
                $select[] = "(d.id {$discussionid_sql} OR p.parent = 0)";
            } else {
                $select[] = "p.parent = 0";
            }
        }
        if (!empty($forum->onlygroups)) {
            list($groupid_sql, $groupid_params) = $DB->get_in_or_equal($forum->onlygroups, SQL_PARAMS_NAMED, 'grps' . $forumid . '_');
            $params = array_merge($params, $groupid_params);
            $select[] = "d.groupid {$groupid_sql}";
        }
        if ($select) {
            $selects = implode(" AND ", $select);
            $where[] = "(d.forum = :forum{$forumid} AND {$selects})";
            $params['forum' . $forumid] = $forumid;
        } else {
            $fullaccess[] = $forumid;
        }
    }
    if ($fullaccess) {
        list($fullid_sql, $fullid_params) = $DB->get_in_or_equal($fullaccess, SQL_PARAMS_NAMED, 'fula');
        $params = array_merge($params, $fullid_params);
        $where[] = "(d.forum {$fullid_sql})";
    }
    $selectdiscussion = "(" . implode(" OR ", $where) . ")";
    $messagesearch = '';
    $searchstring = '';
    // Need to concat these back together for parser to work.
    foreach ($searchterms as $searchterm) {
        if ($searchstring != '') {
            $searchstring .= ' ';
        }
        $searchstring .= $searchterm;
    }
    // We need to allow quoted strings for the search. The quotes *should* be stripped
    // by the parser, but this should be examined carefully for security implications.
    $searchstring = str_replace("\\\"", "\"", $searchstring);
    $parser = new search_parser();
    $lexer = new search_lexer($parser);
    if ($lexer->parse($searchstring)) {
        $parsearray = $parser->get_parsed_array();
        list($messagesearch, $msparams) = search_generate_SQL($parsearray, 'p.message', 'p.subject', 'p.userid', 'u.id', 'u.firstname', 'u.lastname', 'p.modified', 'd.forum');
        $params = array_merge($params, $msparams);
    }
    $fromsql = "{forum_posts} p,\n                  {forum_discussions} d,\n                  {user} u";
    $selectsql = " {$messagesearch}\n               AND p.discussion = d.id\n               AND p.userid = u.id\n               AND {$selectdiscussion}\n                   {$extrasql}";
    $countsql = "SELECT COUNT(*)\n                   FROM {$fromsql}\n                  WHERE {$selectsql}";
    $allnames = get_all_user_name_fields(true, 'u');
    $searchsql = "SELECT p.*,\n                         d.forum,\n                         {$allnames},\n                         u.email,\n                         u.picture,\n                         u.imagealt\n                    FROM {$fromsql}\n                   WHERE {$selectsql}\n                ORDER BY p.modified DESC";
    $totalcount = $DB->count_records_sql($countsql, $params);
    return $DB->get_records_sql($searchsql, $params, $limitfrom, $limitnum);
}

/**
 * Primitive function to generate a SQL string from a parse tree
 * using TEXT indexes. If searches aren't suitable to use TEXT
 * this function calls the default search_generate_SQL() one.
 *
 * $parsetree should be a parse tree generated by a
 * search_lexer/search_parser combination.
 * Other fields are database table names to search.
 *
 * @global object
 * @global object
 */
function search_generate_text_SQL($parsetree, $datafield, $metafield, $mainidfield, $useridfield, $userfirstnamefield, $userlastnamefield, $timefield, $instancefield)
{
    global $CFG, $DB;
    static $p = 0;
    /// First of all, search for reasons to switch to standard SQL generation
    /// Only mysql are supported for now
    if ($DB->get_dbfamily() != 'mysql') {
        return search_generate_SQL($parsetree, $datafield, $metafield, $mainidfield, $useridfield, $userfirstnamefield, $userlastnamefield, $timefield, $instancefield);
    }
    /// Some languages don't have "word separators" and MySQL FULLTEXT doesn't perform well with them, so
    /// switch to standard SQL search generation
    if ($DB->get_dbfamily() == 'mysql') {
        $nonseparatedlangs = array('ja', 'th', 'zh_cn', 'zh_tw');
        if (in_array(current_language(), $nonseparatedlangs)) {
            return search_generate_SQL($parsetree, $datafield, $metafield, $mainidfield, $useridfield, $userfirstnamefield, $userlastnamefield, $timefield, $instancefield);
        }
    }
    /// Here we'll acumulate non-textual tokens
    $non_text_tokens = array();
    $params = array();
    $ntokens = count($parsetree);
    if ($ntokens == 0) {
        return "";
    }
    $SQLString = '';
    $text_sql_string = '';
    $datasearch_clause = '';
    $metasearch_clause = '';
    foreach ($parsetree as $token) {
        $type = $token->getType();
        $value = $token->getValue();
        switch ($type) {
            case TOKEN_STRING:
                /// If it's a multiword token, quote it
                if (strstr($value, ' ')) {
                    $datasearch_clause .= '"' . $value . '" ';
                    /// Simple word token, search for it as prefix
                } else {
                    $datasearch_clause .= '+' . $value . '* ';
                }
                break;
            case TOKEN_EXACT:
                /// token must be exactly as requested
                $datasearch_clause .= '+' . $value . ' ';
                break;
            case TOKEN_NEGATE:
                /// token must not exist as prefix
                $datasearch_clause .= '-' . $value . '* ';
                break;
            case TOKEN_META:
                /// token in metafield, search for it as prefix
                $metasearch_clause .= '+' . $value . '* ';
                break;
            case TOKEN_USER:
            case TOKEN_USERID:
            case TOKEN_INSTANCE:
            case TOKEN_DATETO:
            case TOKEN_DATEFROM:
                /// delegate to standard search
                $non_text_tokens[] = $token;
                break;
            default:
                return '';
        }
    }
    /// Call to standard search for pending tokens
    if (!empty($non_text_tokens)) {
        list($SQLString, $sparams) = search_generate_SQL($non_text_tokens, $datafield, $metafield, $mainidfield, $useridfield, $userfirstnamefield, $userlastnamefield, $timefield, $instancefield);
        $params = array_merge($params, $sparams);
    }
    /// Build the final SQL clause
    if (!empty($datasearch_clause)) {
        /// Must have $datafield to search within
        if (!empty($datafield)) {
            $text_sql_string .= 'MATCH (' . $datafield;
            /// And optionally $metafield
            if (!empty($metafield)) {
                $text_sql_string .= ', ' . $metafield;
            }
            /// Begin with the AGAINST clause
            $text_sql_string .= ') AGAINST (';
            /// Add the search terms
            $text_sql_string .= ':sgt' . $p;
            $params['sgt' . $p++] = trim($datasearch_clause);
            /// Close AGAINST clause
            $text_sql_string .= " IN BOOLEAN MODE)";
        }
    }
//.........这里部分代码省略.........

/**
 * Returns a list of posts found using an array of search terms.
 * @param $searchterms - array of search terms, e.g. word +word -word
 * @param $courseid - if 0, we search through the whole site
 * @param $page
 * @param $recordsperpage=50
 * @param &$totalcount
 * @param $extrasql
 * @return array of posts found
 */
function forum_search_posts($searchterms, $courseid = 0, $limitfrom = 0, $limitnum = 50, &$totalcount, $extrasql = '')
{
    global $CFG, $USER;
    require_once $CFG->libdir . '/searchlib.php';
    $forums = forum_get_readable_forums($USER->id, $courseid);
    if (count($forums) == 0) {
        $totalcount = 0;
        return false;
    }
    $now = round(time(), -2);
    // db friendly
    $fullaccess = array();
    $where = array();
    foreach ($forums as $forumid => $forum) {
        $select = array();
        if (!$forum->viewhiddentimedposts) {
            $select[] = "(d.userid = {$USER->id} OR (d.timestart < {$now} AND (d.timeend = 0 OR d.timeend > {$now})))";
        }
        if ($forum->type == 'qanda') {
            if (!empty($forum->onlydiscussions)) {
                $discussionsids = implode(',', $forum->onlydiscussions);
                $select[] = "(d.id IN ({$discussionsids}) OR p.parent = 0)";
            } else {
                $select[] = "p.parent = 0";
            }
        }
        if (!empty($forum->onlygroups)) {
            $groupids = implode(',', $forum->onlygroups);
            $select[] = "d.groupid IN ({$groupids})";
        }
        if ($select) {
            $selects = implode(" AND ", $select);
            $where[] = "(d.forum = {$forumid} AND {$selects})";
        } else {
            $fullaccess[] = $forumid;
        }
    }
    if ($fullaccess) {
        $fullids = implode(',', $fullaccess);
        $where[] = "(d.forum IN ({$fullids}))";
    }
    $selectdiscussion = "(" . implode(" OR ", $where) . ")";
    // Some differences SQL
    $LIKE = sql_ilike();
    $NOTLIKE = 'NOT ' . $LIKE;
    if ($CFG->dbfamily == 'postgres') {
        $REGEXP = '~*';
        $NOTREGEXP = '!~*';
    } else {
        $REGEXP = 'REGEXP';
        $NOTREGEXP = 'NOT REGEXP';
    }
    $messagesearch = '';
    $searchstring = '';
    // Need to concat these back together for parser to work.
    foreach ($searchterms as $searchterm) {
        if ($searchstring != '') {
            $searchstring .= ' ';
        }
        $searchstring .= $searchterm;
    }
    // We need to allow quoted strings for the search. The quotes *should* be stripped
    // by the parser, but this should be examined carefully for security implications.
    $searchstring = str_replace("\\\"", "\"", $searchstring);
    $parser = new search_parser();
    $lexer = new search_lexer($parser);
    if ($lexer->parse($searchstring)) {
        $parsearray = $parser->get_parsed_array();
        // Experimental feature under 1.8! MDL-8830
        // Use alternative text searches if defined
        // This feature only works under mysql until properly implemented for other DBs
        // Requires manual creation of text index for forum_posts before enabling it:
        // CREATE FULLTEXT INDEX foru_post_tix ON [prefix]forum_posts (subject, message)
        // Experimental feature under 1.8! MDL-8830
        if (!empty($CFG->forum_usetextsearches)) {
            $messagesearch = search_generate_text_SQL($parsearray, 'p.message', 'p.subject', 'p.userid', 'u.id', 'u.firstname', 'u.lastname', 'p.modified', 'd.forum');
        } else {
            $messagesearch = search_generate_SQL($parsearray, 'p.message', 'p.subject', 'p.userid', 'u.id', 'u.firstname', 'u.lastname', 'p.modified', 'd.forum');
        }
    }
    $fromsql = "{$CFG->prefix}forum_posts p,\n                  {$CFG->prefix}forum_discussions d,\n                  {$CFG->prefix}user u";
    $selectsql = " {$messagesearch}\n               AND p.discussion = d.id\n               AND p.userid = u.id\n               AND {$selectdiscussion}\n                   {$extrasql}";
    $countsql = "SELECT COUNT(*)\n                   FROM {$fromsql}\n                  WHERE {$selectsql}";
    $searchsql = "SELECT p.*,\n                         d.forum,\n                         u.firstname,\n                         u.lastname,\n                         u.email,\n                         u.picture,\n                         u.imagealt\n                    FROM {$fromsql}\n                   WHERE {$selectsql}\n                ORDER BY p.modified DESC";
    $totalcount = count_records_sql($countsql);
    return get_records_sql($searchsql, $limitfrom, $limitnum);
}

/**
 * Primitive function to generate a SQL string from a parse tree
 * using TEXT indexes. If searches aren't suitable to use TEXT
 * this function calls the default search_generate_SQL() one.
 *
 * @deprecated since Moodle 2.9 MDL-48939
 * @todo MDL-48940 This will be deleted in Moodle 3.2
 * @see search_generate_SQL()
 */
function search_generate_text_SQL($parsetree, $datafield, $metafield, $mainidfield, $useridfield, $userfirstnamefield, $userlastnamefield, $timefield, $instancefield)
{
    debugging('search_generate_text_SQL() is deprecated, please use search_generate_SQL() instead.', DEBUG_DEVELOPER);
    return search_generate_SQL($parsetree, $datafield, $metafield, $mainidfield, $useridfield, $userfirstnamefield, $userlastnamefield, $timefield, $instancefield);
}

/**
 * Returns a list of posts found using an array of search terms.
 *
 * @global object
 * @global object
 * @global object
 * @param array $searchterms array of search terms, e.g. word +word -word
 * @param int $courseid if 0, we search through the whole site
 * @param int $limitfrom
 * @param int $limitnum
 * @param int &$totalcount
 * @param string $extrasql
 * @return array|bool Array of posts found or false
 */
function hsuforum_search_posts($searchterms, $courseid = 0, $limitfrom = 0, $limitnum = 50, &$totalcount, $extrasql = '')
{
    global $CFG, $DB, $USER;
    require_once $CFG->libdir . '/searchlib.php';
    $forums = hsuforum_get_readable_forums($USER->id, $courseid);
    if (count($forums) == 0) {
        $totalcount = 0;
        return false;
    }
    $now = round(time(), -2);
    // db friendly
    $fullaccess = array();
    $where = array();
    $params = array('privatereply1' => $USER->id, 'privatereply2' => $USER->id);
    foreach ($forums as $forumid => $forum) {
        $select = array();
        if (!$forum->viewhiddentimedposts) {
            $select[] = "(d.userid = :userid{$forumid} OR (d.timestart < :timestart{$forumid} AND (d.timeend = 0 OR d.timeend > :timeend{$forumid})))";
            $params = array_merge($params, array('userid' . $forumid => $USER->id, 'timestart' . $forumid => $now, 'timeend' . $forumid => $now));
        }
        if ($forum->type == 'qanda' && !has_capability('mod/hsuforum:viewqandawithoutposting', $forum->context)) {
            if (!empty($forum->onlydiscussions)) {
                list($discussionid_sql, $discussionid_params) = $DB->get_in_or_equal($forum->onlydiscussions, SQL_PARAMS_NAMED, 'qanda' . $forumid . '_');
                $params = array_merge($params, $discussionid_params);
                $select[] = "(d.id {$discussionid_sql} OR p.parent = 0)";
            } else {
                $select[] = "p.parent = 0";
            }
        }
        if (!empty($forum->onlygroups)) {
            list($groupid_sql, $groupid_params) = $DB->get_in_or_equal($forum->onlygroups, SQL_PARAMS_NAMED, 'grps' . $forumid . '_');
            $params = array_merge($params, $groupid_params);
            $select[] = "d.groupid {$groupid_sql}";
        }
        if ($select) {
            $selects = implode(" AND ", $select);
            $where[] = "(d.forum = :forum{$forumid} AND {$selects})";
            $params['forum' . $forumid] = $forumid;
        } else {
            $fullaccess[] = $forumid;
        }
    }
    if ($fullaccess) {
        list($fullid_sql, $fullid_params) = $DB->get_in_or_equal($fullaccess, SQL_PARAMS_NAMED, 'fula');
        $params = array_merge($params, $fullid_params);
        $where[] = "(d.forum {$fullid_sql})";
    }
    $selectdiscussion = "(" . implode(" OR ", $where) . ")";
    $messagesearch = '';
    $searchstring = '';
    // Need to concat these back together for parser to work.
    foreach ($searchterms as $searchterm) {
        if ($searchstring != '') {
            $searchstring .= ' ';
        }
        $searchstring .= $searchterm;
    }
    // We need to allow quoted strings for the search. The quotes *should* be stripped
    // by the parser, but this should be examined carefully for security implications.
    $searchstring = str_replace("\\\"", "\"", $searchstring);
    $parser = new search_parser();
    $lexer = new search_lexer($parser);
    if ($lexer->parse($searchstring)) {
        $parsearray = $parser->get_parsed_array();
        // Experimental feature under 1.8! MDL-8830
        // Use alternative text searches if defined
        // This feature only works under mysql until properly implemented for other DBs
        // Requires manual creation of text index for hsuforum_posts before enabling it:
        // CREATE FULLTEXT INDEX foru_post_tix ON [prefix]hsuforum_posts (subject, message)
        // Experimental feature under 1.8! MDL-8830
        $usetextsearches = get_config('hsuforum', 'usetextsearches');
        if (!empty($usetextsearches)) {
            list($messagesearch, $msparams) = search_generate_text_SQL($parsearray, 'p.message', 'p.subject', 'p.userid', 'u.id', 'u.firstname', 'u.lastname', 'p.modified', 'd.forum');
        } else {
            list($messagesearch, $msparams) = search_generate_SQL($parsearray, 'p.message', 'p.subject', 'p.userid', 'u.id', 'u.firstname', 'u.lastname', 'p.modified', 'd.forum');
        }
        $params = array_merge($params, $msparams);
    }
    $fromsql = "{hsuforum_posts} p,\n                  {hsuforum_discussions} d JOIN {hsuforum} f ON f.id = d.forum,\n                  {user} u";
    foreach ($parsearray as $item) {
        if ($item->getType() == TOKEN_USER || $item->getType() == TOKEN_USERID) {
            // Additional user SQL for anonymous posts.
            $extrasql .= " AND ((f.anonymous != 1 OR p.userid = :currentuserid) OR p.reveal = 1) ";
            $params['currentuserid'] = $USER->id;
            break;
        }
//.........这里部分代码省略.........

function metadatadc_search_metadatadc($searchterms, $courseid, $page = 0, $recordsperpage = 50, &$totalcount, $sepgroups = 0, $extrasql = '')
{
    /// Returns a list of posts found using an array of search terms
    /// eg   word  +word -word
    ///
    global $CFG, $USER;
    require_once $CFG->libdir . '/searchlib.php';
    /*    if (!isteacher($courseid)) {
            $notteacherforum = "AND f.type <> 'teacher'";
            $forummodule = get_record("modules", "name", "forum");
            $onlyvisible = "AND d.forum = f.id AND f.id = cm.instance AND cm.visible = 1 AND cm.module = $forummodule->id";
            $onlyvisibletable = ", {$CFG->prefix}course_modules cm, {$CFG->prefix}forum f";
            if (!empty($sepgroups)) {
                $separategroups = SEPARATEGROUPS;
                $selectgroup = " AND ( NOT (cm.groupmode='$separategroups'".
                                          " OR (c.groupmode='$separategroups' AND c.groupmodeforce='1') )";//.
                $selectgroup .= " OR d.groupid = '-1'"; //search inside discussions for all groups too
                foreach ($sepgroups as $sepgroup){
                    $selectgroup .= " OR d.groupid = '$sepgroup->id'";
                }
                $selectgroup .= ")";
    
                                   //  " OR d.groupid = '$groupid')";
                $selectcourse = " AND d.course = '$courseid' AND c.id='$courseid'";
                $coursetable = ", {$CFG->prefix}course c";
            } else {
                $selectgroup = '';
                $selectcourse = " AND d.course = '$courseid'";
                $coursetable = '';
            }
        } else {
            $notteacherforum = "";
            $selectgroup = '';
            $onlyvisible = "";
            $onlyvisibletable = "";
            $coursetable = '';
            if ($courseid == SITEID && isadmin()) {
                $selectcourse = '';
            } else {
                $selectcourse = " AND d.course = '$courseid'";
            }
        }
    
        $timelimit = '';
        if (!empty($CFG->forum_enabletimedposts) && (!((isadmin() and !empty($CFG->admineditalways)) || isteacher($courseid)))) {
            $now = time();
            $timelimit = " AND (d.userid = $USER->id OR ((d.timestart = 0 OR d.timestart <= $now) AND (d.timeend = 0 OR d.timeend > $now)))";
        }
    */
    $limit = sql_paging_limit($page, $recordsperpage);
    /// Some differences in syntax for PostgreSQL
    if ($CFG->dbtype == "postgres7") {
        $LIKE = "ILIKE";
        // case-insensitive
        $NOTLIKE = "NOT ILIKE";
        // case-insensitive
        $REGEXP = "~*";
        $NOTREGEXP = "!~*";
    } else {
        $LIKE = "LIKE";
        $NOTLIKE = "NOT LIKE";
        $REGEXP = "REGEXP";
        $NOTREGEXP = "NOT REGEXP";
    }
    $messagesearch = "";
    $searchstring = "";
    // Need to concat these back together for parser to work.
    foreach ($searchterms as $searchterm) {
        if ($searchstring != "") {
            $searchstring .= " ";
        }
        $searchstring .= $searchterm;
    }
    // We need to allow quoted strings for the search. The quotes *should* be stripped
    // by the parser, but this should be examined carefully for security implications.
    $searchstring = str_replace("\\\"", "\"", $searchstring);
    $parser = new search_parser();
    $lexer = new search_lexer($parser);
    if ($lexer->parse($searchstring)) {
        $parsearray = $parser->get_parsed_array();
        $messagesearch = search_generate_SQL($parsearray, 'p.message', 'p.subject', 'p.userid', 'u.id', 'u.firstname', 'u.lastname', 'p.modified', 'd.metadatadc');
    }
    $selectsql = "{$CFG->prefix}metadatadc d,\r\n                  {$CFG->prefix}user u {$onlyvisibletable} {$coursetable}\r\n             WHERE ({$messagesearch})\r\n               AND p.userid = u.id\r\n               AND p.discussion = d.id {$selectcourse} {$notteacherforum} {$onlyvisible} {$selectgroup} {$timelimit} {$extrasql}";
    $totalcount = count_records_sql("SELECT COUNT(*) FROM {$selectsql}");
    return get_records_sql("SELECT p.*,d.forum, u.firstname,u.lastname,u.email,u.picture FROM\r\n                            {$selectsql} ORDER BY p.modified DESC {$limit}");
}