3 require_once 'lib/WikiDB/backend/PearDB.php';
5 // See http://sql-info.de/mysql/gotchas.html for mysql specific quirks.
7 // The slowest function overall is mysql_connect with [680ms]
8 // 2nd is db_mysql::simpleQuery with [257ms]
9 class WikiDB_backend_PearDB_mysql
10 extends WikiDB_backend_PearDB
15 function WikiDB_backend_PearDB_mysql($dbparams)
17 $this->WikiDB_backend_PearDB($dbparams);
18 if (DB::isError($this->_dbh)) return;
19 //$this->_serverinfo = $this->_dbh->ServerInfo();
20 $row = $this->_dbh->GetOne("SELECT version()");
21 if (!DB::isError($row) and !empty($row)) {
22 $arr = explode('.', $row);
23 $this->_serverinfo['version'] = (string)(($arr[0] * 100) + $arr[1]) .
24 "." . (integer)$arr[2];
25 if ($this->_serverinfo['version'] < 323.0) {
26 // Older MySQL's don't have CASE WHEN ... END
27 $this->_expressions['maxmajor'] = "MAX(IF(minor_edit=0,version,0))";
28 $this->_expressions['maxminor'] = "MAX(IF(minor_edit<>0,version,0))";
30 // esp. needed for utf databases
31 if ($this->_serverinfo['version'] > 401.0) {
33 $aliases = array('iso-8859-1' => 'latin1',
35 //http://dev.mysql.com/doc/mysql/en/charset-connection.html
36 if (isset($aliases[strtolower($charset)])) {
37 // mysql needs special unusual names and doesn't resolve aliases
38 mysql_query("SET NAMES '" . $aliases[strtolower($charset)] . "'");
40 mysql_query("SET NAMES '$charset'");
47 * Kill timed out processes. ( so far only called on about every 50-th save. )
51 if (empty($this->_dbparams['timeout'])) return;
52 $result = mysql_query("SHOW processlist");
53 while ($row = mysql_fetch_array($result)) {
54 if ($row["db"] == $this->_dbh->dsn['database']
55 and $row["User"] == $this->_dbh->dsn['username']
56 and $row["Time"] > $this->_dbparams['timeout']
57 and $row["Command"] == "Sleep"
59 $process_id = $row["Id"];
60 mysql_query("KILL $process_id");
66 * Create a new revision of a page.
68 function set_versiondata($pagename, $version, $data)
71 $version_tbl = $this->_table_names['version_tbl'];
73 $minor_edit = (int)!empty($data['is_minor_edit']);
74 unset($data['is_minor_edit']);
76 $mtime = (int)$data['mtime'];
77 unset($data['mtime']);
78 assert(!empty($mtime));
80 @$content = (string)$data['%content'];
81 unset($data['%content']);
82 unset($data['%pagedata']);
85 $id = $this->_get_pageid($pagename, true);
86 // requires PRIMARY KEY (id,version)!
87 // VALUES supported since mysql-3.22.5
88 $dbh->query(sprintf("REPLACE INTO $version_tbl"
89 . " (id,version,mtime,minor_edit,content,versiondata)"
90 . " VALUES(%d,%d,%d,%d,'%s','%s')",
91 $id, $version, $mtime, $minor_edit,
92 $dbh->escapeSimple($content),
93 $dbh->escapeSimple($this->_serialize($data))
95 // real binding (prepare,execute) only since mysqli + PHP5
96 $this->_update_recent_table($id);
97 $this->_update_nonempty_table($id);
101 function _update_recent_table($pageid = false)
104 extract($this->_table_names);
105 extract($this->_expressions);
107 $pageid = (int)$pageid;
109 // optimized: mysql can do this with one REPLACE INTO.
110 // supported in every (?) mysql version
111 // requires PRIMARY KEY (id)!
112 $dbh->query("REPLACE INTO $recent_tbl"
113 . " (id, latestversion, latestmajor, latestminor)"
114 . " SELECT id, $maxversion, $maxmajor, $maxminor"
115 . " FROM $version_tbl"
116 . ($pageid ? " WHERE id=$pageid" : "")
120 /* ISNULL is mysql specific */
121 function wanted_pages($exclude_from = '', $exclude = '', $sortby = '', $limit = '')
124 extract($this->_table_names);
125 if ($orderby = $this->sortby($sortby, 'db', array('pagename', 'wantedfrom')))
126 $orderby = 'ORDER BY ' . $orderby;
128 if ($exclude_from) // array of pagenames
129 $exclude_from = " AND pp.pagename NOT IN " . $this->_sql_set($exclude_from);
130 if ($exclude) // array of pagenames
131 $exclude = " AND p.pagename NOT IN " . $this->_sql_set($exclude);
133 $sql = "SELECT p.pagename, pp.pagename as wantedfrom"
134 . " FROM $page_tbl p, $link_tbl linked"
135 . " LEFT JOIN $page_tbl pp ON (linked.linkto = pp.id)"
136 . " LEFT JOIN $nonempty_tbl ne ON (linked.linkto = ne.id)"
137 . " WHERE ISNULL(ne.id)"
138 . " AND p.id = linked.linkfrom"
143 list($from, $count) = $this->limit($limit);
144 $result = $dbh->limitQuery($sql, $from, $count * 3);
146 $result = $dbh->query($sql);
148 return new WikiDB_backend_PearDB_generic_iter($this, $result);
151 /* // REPLACE will not delete empy pages, so it was removed --ru
152 function _update_nonempty_table($pageid = false) {
154 extract($this->_table_names);
156 $pageid = (int)$pageid;
158 // Optimized: mysql can do this with one REPLACE INTO.
159 // supported in every (?) mysql version
160 // requires PRIMARY KEY (id)
161 $dbh->query("REPLACE INTO $nonempty_tbl (id)"
162 . " SELECT $recent_tbl.id"
163 . " FROM $recent_tbl, $version_tbl"
164 . " WHERE $recent_tbl.id=$version_tbl.id"
165 . " AND version=latestversion"
167 . ( $pageid ? " AND $recent_tbl.id=$pageid" : ""));
178 foreach ($this->_table_names as $table) {
179 $dbh->query("OPTIMIZE TABLE $table");
187 function _lock_tables($write_lock = true)
189 $lock_type = $write_lock ? "WRITE" : "READ";
190 foreach ($this->_table_names as $table) {
191 $tables[] = "$table $lock_type";
193 $this->_dbh->query("LOCK TABLES " . join(",", $tables));
199 function _unlock_tables()
201 $this->_dbh->query("UNLOCK TABLES");
204 function increaseHitCount($pagename)
207 // Hits is the only thing we can update in a fast manner.
208 // Note that this will fail silently if the page does not
209 // have a record in the page table. Since it's just the
210 // hit count, who cares?
212 $dbh->query(sprintf("UPDATE LOW_PRIORITY %s SET hits=hits+1 WHERE pagename='%s' %s",
213 $this->_table_names['page_tbl'],
214 $dbh->escapeSimple($pagename),
215 ($this->_serverinfo['version'] >= 323.0) ? "LIMIT 1" : ""));
223 class WikiDB_backend_PearDB_mysql_search
224 extends WikiDB_backend_PearDB_search
226 function _pagename_match_clause($node)
228 $word = $node->sql();
229 if ($node->op == 'REGEX') { // posix regex extensions
230 return "pagename REGEXP '$word'";
232 return ($this->_case_exact
233 ? "pagename LIKE '$word'"
234 : "LOWER(pagename) LIKE '$word'");
243 // c-hanging-comment-ender-p: nil
244 // indent-tabs-mode: nil