4 require_once('lib/WikiDB/backend/PearDB.php');
6 // See http://sql-info.de/mysql/gotchas.html for mysql specific quirks.
8 // The slowest function overall is mysql_connect with [680ms]
9 // 2nd is db_mysql::simpleQuery with [257ms]
10 class WikiDB_backend_PearDB_mysql
11 extends WikiDB_backend_PearDB
16 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 '$charset'");
47 * Kill timed out processes. ( so far only called on about every 50-th save. )
50 if (empty($this->_dbparams['timeout'])) return;
51 $result = mysql_query("SHOW processlist");
52 while ($row = mysql_fetch_array($result)) {
53 if ($row["db"] == $this->_dbh->dsn['database']
54 and $row["User"] == $this->_dbh->dsn['username']
55 and $row["Time"] > $this->_dbparams['timeout']
56 and $row["Command"] == "Sleep")
58 $process_id = $row["Id"];
59 mysql_query("KILL $process_id");
65 * Create a new revision of a page.
67 function set_versiondata($pagename, $version, $data) {
69 $version_tbl = $this->_table_names['version_tbl'];
71 $minor_edit = (int) !empty($data['is_minor_edit']);
72 unset($data['is_minor_edit']);
74 $mtime = (int)$data['mtime'];
75 unset($data['mtime']);
76 assert(!empty($mtime));
78 @$content = (string) $data['%content'];
79 unset($data['%content']);
80 unset($data['%pagedata']);
83 $id = $this->_get_pageid($pagename, true);
84 // requires PRIMARY KEY (id,version)!
85 // VALUES supported since mysql-3.22.5
86 $dbh->query(sprintf("REPLACE INTO $version_tbl"
87 . " (id,version,mtime,minor_edit,content,versiondata)"
88 . " VALUES(%d,%d,%d,%d,'%s','%s')",
89 $id, $version, $mtime, $minor_edit,
90 $dbh->escapeSimple($content),
91 $dbh->escapeSimple($this->_serialize($data))
93 // real binding (prepare,execute) only since mysqli + PHP5
94 $this->_update_recent_table($id);
95 $this->_update_nonempty_table($id);
99 function _update_recent_table($pageid = false) {
101 extract($this->_table_names);
102 extract($this->_expressions);
104 $pageid = (int)$pageid;
106 // optimized: mysql can do this with one REPLACE INTO.
107 // supported in every (?) mysql version
108 // requires PRIMARY KEY (id)!
109 $dbh->query("REPLACE INTO $recent_tbl"
110 . " (id, latestversion, latestmajor, latestminor)"
111 . " SELECT id, $maxversion, $maxmajor, $maxminor"
112 . " FROM $version_tbl"
113 . ( $pageid ? " WHERE id=$pageid" : "")
117 /* ISNULL is mysql specific */
118 function wanted_pages($exclude_from='', $exclude='', $sortby='', $limit='') {
120 extract($this->_table_names);
121 if ($orderby = $this->sortby($sortby, 'db', array('pagename','wantedfrom')))
122 $orderby = 'ORDER BY ' . $orderby;
124 if ($exclude_from) // array of pagenames
125 $exclude_from = " AND pp.pagename NOT IN ".$this->_sql_set($exclude_from);
126 if ($exclude) // array of pagenames
127 $exclude = " AND p.pagename NOT IN ".$this->_sql_set($exclude);
129 $sql = "SELECT p.pagename, pp.pagename as wantedfrom"
130 . " FROM $page_tbl p, $link_tbl linked"
131 . " LEFT JOIN $page_tbl pp ON (linked.linkto = pp.id)"
132 . " LEFT JOIN $nonempty_tbl ne ON (linked.linkto = ne.id)"
133 . " WHERE ISNULL(ne.id)"
134 . " AND p.id = linked.linkfrom"
139 list($from, $count) = $this->limit($limit);
140 $result = $dbh->limitQuery($sql, $from, $count * 3);
142 $result = $dbh->query($sql);
144 return new WikiDB_backend_PearDB_generic_iter($this, $result);
147 /* // REPLACE will not delete empy pages, so it was removed --ru
148 function _update_nonempty_table($pageid = false) {
150 extract($this->_table_names);
152 $pageid = (int)$pageid;
154 // Optimized: mysql can do this with one REPLACE INTO.
155 // supported in every (?) mysql version
156 // requires PRIMARY KEY (id)
157 $dbh->query("REPLACE INTO $nonempty_tbl (id)"
158 . " SELECT $recent_tbl.id"
159 . " FROM $recent_tbl, $version_tbl"
160 . " WHERE $recent_tbl.id=$version_tbl.id"
161 . " AND version=latestversion"
163 . ( $pageid ? " AND $recent_tbl.id=$pageid" : ""));
170 function optimize() {
173 foreach ($this->_table_names as $table) {
174 $dbh->query("OPTIMIZE TABLE $table");
182 function _lock_tables($write_lock = true) {
183 $lock_type = $write_lock ? "WRITE" : "READ";
184 foreach ($this->_table_names as $table) {
185 $tables[] = "$table $lock_type";
187 $this->_dbh->query("LOCK TABLES " . join(",", $tables));
193 function _unlock_tables() {
194 $this->_dbh->query("UNLOCK TABLES");
197 function increaseHitCount($pagename) {
199 // Hits is the only thing we can update in a fast manner.
200 // Note that this will fail silently if the page does not
201 // have a record in the page table. Since it's just the
202 // hit count, who cares?
204 $dbh->query(sprintf("UPDATE LOW_PRIORITY %s SET hits=hits+1 WHERE pagename='%s' %s",
205 $this->_table_names['page_tbl'],
206 $dbh->escapeSimple($pagename),
207 ($this->_serverinfo['version'] >= 323.0) ? "LIMIT 1": ""));
213 class WikiDB_backend_PearDB_mysql_search
214 extends WikiDB_backend_PearDB_search
216 function _pagename_match_clause($node) {
217 $word = $node->sql();
218 if ($node->op == 'REGEX') { // posix regex extensions
219 return "pagename REGEXP '$word'";
221 return ($this->_case_exact
222 ? "pagename LIKE '$word'"
223 : "LOWER(pagename) LIKE '$word'");
228 // (c-file-style: "gnu")
233 // c-hanging-comment-ender-p: nil
234 // indent-tabs-mode: nil