fields["$colname"]
* 4) No error handling yet - could use ADOConnection->raiseErrorFn
* 5) It used to be faster then PEAR/DB at the beginning of 2002.
* Now at August 2002 PEAR/DB with our own page cache added,
* performance is comparable.
*/
require_once('lib/WikiDB/backend.php');
// Error handling - calls trigger_error. NB - does not close the connection. Does it need to?
include_once('lib/WikiDB/adodb/adodb-errorhandler.inc.php');
// include the main adodb file
require_once('lib/WikiDB/adodb/adodb.inc.php');
class WikiDB_backend_ADODB
extends WikiDB_backend
{
function WikiDB_backend_ADODB ($dbparams) {
$parsed = parseDSN($dbparams['dsn']);
$this->_dbparams = $dbparams;
$this->_parsedDSN =& $parsed;
$this->_dbh = &ADONewConnection($parsed['phptype']);
if (DEBUG & _DEBUG_SQL) {
$this->_dbh->debug = true;
$GLOBALS['ADODB_OUTP'] = '_sql_debuglog';
}
$this->_dsn = $parsed;
// persistent is defined as DSN option, or with a config value.
// phptype://username:password@hostspec/database?persistent=false
//FIXME: how to catch connection errors for dbamin_user?
if (!empty($parsed['persistent']) or DATABASE_PERSISTENT)
$conn = $this->_dbh->PConnect($parsed['hostspec'],$parsed['username'],
$parsed['password'], $parsed['database']);
else
$conn = $this->_dbh->Connect($parsed['hostspec'],$parsed['username'],
$parsed['password'], $parsed['database']);
if (!$conn) return;
// Since 1.3.10 we use the faster ADODB_FETCH_NUM,
// with some ASSOC based recordsets.
$GLOBALS['ADODB_FETCH_MODE'] = ADODB_FETCH_NUM;
$this->_dbh->SetFetchMode(ADODB_FETCH_NUM);
$GLOBALS['ADODB_COUNTRECS'] = false;
$prefix = isset($dbparams['prefix']) ? $dbparams['prefix'] : '';
$this->_table_names
= array('page_tbl' => $prefix . 'page',
'version_tbl' => $prefix . 'version',
'link_tbl' => $prefix . 'link',
'recent_tbl' => $prefix . 'recent',
'nonempty_tbl' => $prefix . 'nonempty');
$page_tbl = $this->_table_names['page_tbl'];
$version_tbl = $this->_table_names['version_tbl'];
$this->page_tbl_fields = "$page_tbl.id AS id, $page_tbl.pagename AS pagename, "
. "$page_tbl.hits AS hits";
$this->links_field_list = array('id', 'pagename');
$this->page_tbl_field_list = array('id', 'pagename', 'hits');
$this->version_tbl_fields = "$version_tbl.version AS version, "
. "$version_tbl.mtime AS mtime, "
. "$version_tbl.minor_edit AS minor_edit, $version_tbl.content AS content, "
. "$version_tbl.versiondata AS versiondata";
$this->version_tbl_field_list = array('version', 'mtime', 'minor_edit', 'content',
'versiondata');
$this->_expressions
= array('maxmajor' => "MAX(CASE WHEN minor_edit=0 THEN version END)",
'maxminor' => "MAX(CASE WHEN minor_edit<>0 THEN version END)",
'maxversion' => "MAX(version)",
'notempty' => "<>''",
'iscontent' => "$version_tbl.content<>''");
$this->_lock_count = 0;
}
/**
* Close database connection.
*/
function close () {
if (!$this->_dbh)
return;
if ($this->_lock_count) {
trigger_error("WARNING: database still locked " .
'(lock_count = $this->_lock_count)' . "\n
",
E_USER_WARNING);
}
// $this->_dbh->setErrorHandling(PEAR_ERROR_PRINT); // prevent recursive loops.
$this->unlock(false,'force');
$this->_dbh->close();
$this->_dbh = false;
}
/*
* Fast test for wikipage.
*/
function is_wiki_page($pagename) {
$dbh = &$this->_dbh;
extract($this->_table_names);
$row = $dbh->GetRow(sprintf("SELECT $page_tbl.id AS id"
. " FROM $nonempty_tbl, $page_tbl"
. " WHERE $nonempty_tbl.id=$page_tbl.id"
. " AND pagename=%s",
$dbh->qstr($pagename)));
return $row ? $row[0] : false;
}
function get_all_pagenames() {
$dbh = &$this->_dbh;
extract($this->_table_names);
$result = $dbh->Execute("SELECT pagename"
. " FROM $nonempty_tbl, $page_tbl"
. " WHERE $nonempty_tbl.id=$page_tbl.id");
return $result->GetArray();
}
/*
* filter (nonempty pages) currently ignored
*/
function numPages($filter=false, $exclude='') {
$dbh = &$this->_dbh;
extract($this->_table_names);
$result = $dbh->getRow("SELECT count(*)"
. " FROM $nonempty_tbl, $page_tbl"
. " WHERE $nonempty_tbl.id=$page_tbl.id");
return $result[0];
}
function increaseHitCount($pagename) {
$dbh = &$this->_dbh;
// Hits is the only thing we can update in a fast manner.
// Note that this will fail silently if the page does not
// have a record in the page table. Since it's just the
// hit count, who cares?
$dbh->Execute(sprintf("UPDATE %s SET hits=hits+1 WHERE pagename=%s",
$this->_table_names['page_tbl'],
$dbh->qstr($pagename)));
return;
}
/**
* Read page information from database.
*/
function get_pagedata($pagename) {
$dbh = &$this->_dbh;
$row = $dbh->GetRow(sprintf("SELECT id,pagename,hits,pagedata FROM %s WHERE pagename=%s",
$this->_table_names['page_tbl'],
$dbh->qstr($pagename)));
return $row ? $this->_extract_page_data($row[3], $row[2]) : false;
}
function _extract_page_data($data, $hits) {
if (empty($data))
return array('hits' => $hits);
else
return array_merge(array('hits' => $hits), $this->_unserialize($data));
}
function update_pagedata($pagename, $newdata) {
$dbh = &$this->_dbh;
$page_tbl = $this->_table_names['page_tbl'];
// Hits is the only thing we can update in a fast manner.
if (count($newdata) == 1 && isset($newdata['hits'])) {
// Note that this will fail silently if the page does not
// have a record in the page table. Since it's just the
// hit count, who cares?
$dbh->Execute(sprintf("UPDATE $page_tbl SET hits=%d WHERE pagename=%s",
$newdata['hits'], $dbh->qstr($pagename)));
return;
}
$where = sprintf("pagename=%s", $dbh->qstr($pagename));
$dbh->BeginTrans( );
$dbh->RowLock($page_tbl,$where);
$data = $this->get_pagedata($pagename);
if (!$data) {
$data = array();
$this->_get_pageid($pagename, true); // Creates page record
}
$hits = (empty($data['hits'])) ? 0 : (int)$data['hits'];
unset($data['hits']);
foreach ($newdata as $key => $val) {
if ($key == 'hits')
$hits = (int)$val;
else if (empty($val))
unset($data[$key]);
else
$data[$key] = $val;
}
if ($dbh->Execute("UPDATE $page_tbl"
. " SET hits=?, pagedata=?"
. " WHERE pagename=?",
array($hits, $this->_serialize($data), $pagename))) {
$dbh->CommitTrans( );
return true;
} else {
$dbh->RollbackTrans( );
return false;
}
}
function get_cached_html($pagename) {
$dbh = &$this->_dbh;
$page_tbl = $this->_table_names['page_tbl'];
$row = $dbh->GetRow(sprintf("SELECT cached_html FROM $page_tbl WHERE pagename=%s",
$dbh->qstr($pagename)));
return $row ? $row[0] : false;
}
function set_cached_html($pagename, $data) {
$dbh = &$this->_dbh;
$page_tbl = $this->_table_names['page_tbl'];
if (empty($data)) $data = '';
$rs = $dbh->Execute("UPDATE $page_tbl"
. " SET cached_html=?"
. " WHERE pagename=?",
array($data, $pagename));
}
function _get_pageid($pagename, $create_if_missing = false) {
// check id_cache
global $request;
$cache =& $request->_dbi->_cache->_id_cache;
if (isset($cache[$pagename])) {
if ($cache[$pagename] or !$create_if_missing) {
return $cache[$pagename];
}
}
// attributes play this game.
if ($pagename === '') return 0;
$dbh = &$this->_dbh;
$page_tbl = $this->_table_names['page_tbl'];
$query = sprintf("SELECT id FROM $page_tbl WHERE pagename=%s",
$dbh->qstr($pagename));
if (! $create_if_missing ) {
$row = $dbh->GetRow($query);
return $row ? $row[0] : false;
}
$row = $dbh->GetRow($query);
if (! $row ) {
//TODO: Does the DBM has subselects? Then we can do it with select max(id)+1
// $this->lock(array('page'));
$dbh->BeginTrans( );
$dbh->CommitLock($page_tbl);
if (0 and $dbh->hasGenID) {
// requires create permissions
$id = $dbh->GenID($page_tbl."_id");
} else {
// Better generic version than with adodb::genID
$row = $dbh->GetRow("SELECT MAX(id) FROM $page_tbl");
$id = $row[0] + 1;
}
$rs = $dbh->Execute(sprintf("INSERT INTO $page_tbl"
. " (id,pagename,hits)"
. " VALUES (%d,%s,0)",
$id, $dbh->qstr($pagename)));
if ($rs) $dbh->CommitTrans( );
else $dbh->RollbackTrans( );
// $this->unlock(array('page'));
} else {
$id = $row[0];
}
assert($id);
return $id;
}
function get_latest_version($pagename) {
$dbh = &$this->_dbh;
extract($this->_table_names);
$row = $dbh->GetRow(sprintf("SELECT latestversion"
. " FROM $page_tbl, $recent_tbl"
. " WHERE $page_tbl.id=$recent_tbl.id"
. " AND pagename=%s",
$dbh->qstr($pagename)));
return $row ? (int)$row[0] : false;
}
function get_previous_version($pagename, $version) {
$dbh = &$this->_dbh;
extract($this->_table_names);
// Use SELECTLIMIT for maximum portability
$rs = $dbh->SelectLimit(sprintf("SELECT version"
. " FROM $version_tbl, $page_tbl"
. " WHERE $version_tbl.id=$page_tbl.id"
. " AND pagename=%s"
. " AND version < %d"
. " ORDER BY version DESC",
$dbh->qstr($pagename),
$version),
1);
return $rs->fields ? (int)$rs->fields[0] : false;
}
/**
* Get version data.
*
* @param $version int Which version to get.
*
* @return hash The version data, or false if specified version does not
* exist.
*/
function get_versiondata($pagename, $version, $want_content = false) {
$dbh = &$this->_dbh;
extract($this->_table_names);
extract($this->_expressions);
assert(is_string($pagename) and $pagename != '');
assert($version > 0);
// FIXME: optimization: sometimes don't get page data?
if ($want_content) {
$fields = $this->page_tbl_fields . ", $page_tbl.pagedata AS pagedata"
. ', ' . $this->version_tbl_fields;
} else {
$fields = $this->page_tbl_fields . ", '' AS pagedata"
. ", $version_tbl.version AS version, $version_tbl.mtime AS mtime, "
. "$version_tbl.minor_edit AS minor_edit, $iscontent AS have_content, "
. "$version_tbl.versiondata as versiondata";
}
$row = $dbh->GetRow(sprintf("SELECT $fields"
. " FROM $page_tbl, $version_tbl"
. " WHERE $page_tbl.id=$version_tbl.id"
. " AND pagename=%s"
. " AND version=%d",
$dbh->qstr($pagename), $version));
return $row ? $this->_extract_version_data_num($row, $want_content) : false;
}
function _extract_version_data_num($row, $want_content) {
if (!$row)
return false;
//$id &= $row[0];
//$pagename &= $row[1];
$data = empty($row[8]) ? array() : $this->_unserialize($row[8]);
$data['mtime'] = $row[5];
$data['is_minor_edit'] = !empty($row[6]);
if ($want_content) {
$data['%content'] = $row[7];
} else {
$data['%content'] = !empty($row[7]);
}
if (!empty($row[3])) {
$data['%pagedata'] = $this->_extract_page_data($row[3], $row[2]);
}
return $data;
}
function _extract_version_data_assoc($row) {
if (!$row)
return false;
extract($row);
$data = empty($versiondata) ? array() : $this->_unserialize($versiondata);
$data['mtime'] = $mtime;
$data['is_minor_edit'] = !empty($minor_edit);
if (isset($content))
$data['%content'] = $content;
elseif ($have_content)
$data['%content'] = true;
else
$data['%content'] = '';
if (!empty($pagedata)) {
// hmm, $pagedata = is already extracted by WikiDB_backend_ADODB_iter
//$data['%pagedata'] = $this->_extract_page_data($pagedata, $hits);
$data['%pagedata'] = $pagedata;
}
return $data;
}
/**
* Create a new revision of a page.
*/
function set_versiondata($pagename, $version, $data) {
$dbh = &$this->_dbh;
$version_tbl = $this->_table_names['version_tbl'];
$minor_edit = (int) !empty($data['is_minor_edit']);
unset($data['is_minor_edit']);
$mtime = (int)$data['mtime'];
unset($data['mtime']);
assert(!empty($mtime));
@$content = (string) $data['%content'];
unset($data['%content']);
unset($data['%pagedata']);
$this->lock(array('page','recent','version','nonempty'));
$dbh->BeginTrans( );
$dbh->CommitLock($version_tbl);
$id = $this->_get_pageid($pagename, true);
$backend_type = $this->backendType();
$dbh->Execute(sprintf("DELETE FROM $version_tbl"
. " WHERE id=%d AND version=%d",
$id, $version));
$rs = $dbh->Execute("INSERT INTO $version_tbl"
. " (id,version,mtime,minor_edit,content,versiondata)"
. " VALUES(?,?,?,?,?,?)",
array($id, $version, $mtime, $minor_edit,
$content, $this->_serialize($data)));
$this->_update_recent_table($id);
$this->_update_nonempty_table($id);
if ($rs) $dbh->CommitTrans( );
else $dbh->RollbackTrans( );
$this->unlock(array('page','recent','version','nonempty'));
}
/**
* Delete an old revision of a page.
*/
function delete_versiondata($pagename, $version) {
$dbh = &$this->_dbh;
extract($this->_table_names);
$this->lock(array('version'));
if ( ($id = $this->_get_pageid($pagename)) ) {
$dbh->Execute("DELETE FROM $version_tbl"
. " WHERE id=$id AND version=$version");
$this->_update_recent_table($id);
// This shouldn't be needed (as long as the latestversion
// never gets deleted.) But, let's be safe.
$this->_update_nonempty_table($id);
}
$this->unlock(array('version'));
}
/**
* Delete page from the database with backup possibility.
* i.e save_page('') and DELETE nonempty id
*
* deletePage increments latestversion in recent to a non-existent version,
* and removes the nonempty row,
* so that get_latest_version returns id+1 and get_previous_version returns prev id
* and page->exists returns false.
*/
function delete_page($pagename) {
$dbh = &$this->_dbh;
extract($this->_table_names);
$dbh->BeginTrans();
$dbh->CommitLock($recent_tbl);
if (($id = $this->_get_pageid($pagename, false)) === false) {
$dbh->RollbackTrans( );
return false;
}
$mtime = time();
$user =& $GLOBALS['request']->_user;
$meta = array('author' => $user->getId(),
'author_id' => $user->getAuthenticatedId(),
'mtime' => $mtime);
$this->lock(array('version','recent','nonempty','page','link'));
$version = $this->get_latest_version($pagename);
if ($dbh->Execute("UPDATE $recent_tbl SET latestversion=latestversion+1,"
. "latestmajor=latestversion+1,latestminor=NULL WHERE id=$id")
and $dbh->Execute("INSERT INTO $version_tbl"
. " (id,version,mtime,minor_edit,content,versiondata)"
. " VALUES(?,?,?,?,?,?)",
array($id, $version+1, $mtime, 0,
'', $this->_serialize($meta)))
and $dbh->Execute("DELETE FROM $nonempty_tbl WHERE id=$id")
and $this->set_links($pagename, false)
// need to keep perms and LOCKED, otherwise you can reset the perm
// by action=remove and re-create it with default perms
// keep hits but delete meta-data
//and $dbh->Execute("UPDATE $page_tbl SET pagedata='' WHERE id=$id")
)
{
$this->unlock(array('version','recent','nonempty','page','link'));
$dbh->CommitTrans( );
return true;
} else {
$this->unlock(array('version','recent','nonempty','page','link'));
$dbh->RollbackTrans( );
return false;
}
}
function purge_page($pagename) {
$dbh = &$this->_dbh;
extract($this->_table_names);
$this->lock(array('version','recent','nonempty','page','link'));
if ( ($id = $this->_get_pageid($pagename, false)) ) {
$dbh->Execute("DELETE FROM $nonempty_tbl WHERE id=$id");
$dbh->Execute("DELETE FROM $recent_tbl WHERE id=$id");
$dbh->Execute("DELETE FROM $version_tbl WHERE id=$id");
$this->set_links($pagename, false);
$row = $dbh->GetRow("SELECT COUNT(*) FROM $link_tbl WHERE linkto=$id");
if ($row and $row[0]) {
// We're still in the link table (dangling link) so we can't delete this
// altogether.
$dbh->Execute("UPDATE $page_tbl SET hits=0, pagedata='' WHERE id=$id");
$result = 0;
}
else {
$dbh->Execute("DELETE FROM $page_tbl WHERE id=$id");
$result = 1;
}
} else {
$result = -1; // already purged or not existing
}
$this->unlock(array('version','recent','nonempty','page','link'));
return $result;
}
// The only thing we might be interested in updating which we can
// do fast in the flags (minor_edit). I think the default
// update_versiondata will work fine...
//function update_versiondata($pagename, $version, $data) {
//}
/*
* Update link table.
* on DEBUG: delete old, deleted links from page
*/
function set_links($pagename, $links) {
// FIXME: optimize: mysql can do this all in one big INSERT/REPLACE.
$dbh = &$this->_dbh;
extract($this->_table_names);
$this->lock(array('link'));
$pageid = $this->_get_pageid($pagename, true);
$oldlinks = $dbh->getAssoc("SELECT $link_tbl.linkto as id, page.pagename FROM $link_tbl"
." JOIN page ON ($link_tbl.linkto = page.id)"
." WHERE linkfrom=$pageid");
// Delete current links,
$dbh->Execute("DELETE FROM $link_tbl WHERE linkfrom=$pageid");
// and insert new links. Faster than checking for all single links
if ($links) {
foreach ($links as $link) {
$linkto = $link['linkto'];
if (isset($link['relation']))
$relation = $this->_get_pageid($link['relation'], true);
else
$relation = 0;
if ($linkto === "") { // ignore attributes
continue;
}
// avoid duplicates
if (isset($linkseen[$linkto]) and !$relation) {
continue;
}
if (!$relation) {
$linkseen[$linkto] = true;
}
$linkid = $this->_get_pageid($linkto, true);
assert($linkid);
if ($relation) {
$dbh->Execute("INSERT INTO $link_tbl (linkfrom, linkto, relation)"
. " VALUES ($pageid, $linkid, $relation)");
} else {
$dbh->Execute("INSERT INTO $link_tbl (linkfrom, linkto)"
. " VALUES ($pageid, $linkid)");
}
if ($oldlinks and array_key_exists($linkid, $oldlinks)) {
// This was also in the previous page
unset($oldlinks[$linkid]);
}
}
}
// purge page table: delete all non-referenced pages
// for all previously linked pages, which have no other linkto links
if (DEBUG and $oldlinks) {
// trigger_error("purge page table: delete all non-referenced pages...", E_USER_NOTICE);
foreach ($oldlinks as $id => $name) {
// ...check if the page is empty and has no version
$result = $dbh->getRow("SELECT $page_tbl.id FROM $page_tbl"
. " LEFT JOIN $nonempty_tbl USING (id) "
. " LEFT JOIN $version_tbl USING (id)"
. " WHERE $nonempty_tbl.id is NULL"
. " AND $version_tbl.id is NULL"
. " AND $page_tbl.id=$id");
$linkto = $dbh->getRow("SELECT linkfrom FROM $link_tbl WHERE linkto=$id");
if ($result and empty($linkto))
{
trigger_error("delete empty and non-referenced link $name ($id)", E_USER_NOTICE);
$dbh->Execute("DELETE FROM $recent_tbl WHERE id=$id"); // may fail
$dbh->Execute("DELETE FROM $link_tbl WHERE linkto=$id");
$dbh->Execute("DELETE FROM $page_tbl WHERE id=$id"); // this purges the link
}
}
}
$this->unlock(array('link'));
return true;
}
/* get all oldlinks in hash => id, relation
check for all new links
*/
function set_links1($pagename, $links) {
$dbh = &$this->_dbh;
extract($this->_table_names);
$this->lock(array('link'));
$pageid = $this->_get_pageid($pagename, true);
$oldlinks = $dbh->getAssoc("SELECT $link_tbl.linkto as linkto, $link_tbl.relation, page.pagename"
." FROM $link_tbl"
." JOIN page ON ($link_tbl.linkto = page.id)"
." WHERE linkfrom=$pageid");
/* old new
* X => [1,0 2,0 1,1] X => [1,1 3,0]
* => delete 1,0 2,0 + insert 3,0
*/
if ($links) {
foreach ($links as $link) {
$linkto = $link['linkto'];
if ($link['relation'])
$relation = $this->_get_pageid($link['relation'], true);
else
$relation = 0;
// avoid duplicates
if (isset($linkseen[$linkto]) and !$relation) {
continue;
}
if (!$relation) {
$linkseen[$linkto] = true;
}
$linkid = $this->_get_pageid($linkto, true);
assert($linkid);
$skip = 0;
// find linkfrom,linkto,relation triple in oldlinks
foreach ($oldlinks as $l) {
if ($relation) { // relation NOT NULL
if ($l['linkto'] == $linkid and $l['relation'] == $relation) {
// found and skip
$skip = 1;
}
}
}
if (! $skip ) {
if ($update) {
}
if ($relation) {
$dbh->Execute("INSERT INTO $link_tbl (linkfrom, linkto, relation)"
. " VALUES ($pageid, $linkid, $relation)");
} else {
$dbh->Execute("INSERT INTO $link_tbl (linkfrom, linkto)"
. " VALUES ($pageid, $linkid)");
}
}
if (array_key_exists($linkid, $oldlinks)) {
// This was also in the previous page
unset($oldlinks[$linkid]);
}
}
}
// purge page table: delete all non-referenced pages
// for all previously linked pages...
if (DEBUG and $oldlinks) {
// trigger_error("purge page table: delete all non-referenced pages...", E_USER_NOTICE);
foreach ($oldlinks as $id => $name) {
// ...check if the page is empty and has no version
if ($dbh->getRow("SELECT $page_tbl.id FROM $page_tbl"
. " LEFT JOIN $nonempty_tbl USING (id) "
. " LEFT JOIN $version_tbl USING (id)"
. " WHERE $nonempty_tbl.id is NULL"
. " AND $version_tbl.id is NULL"
. " AND $page_tbl.id=$id"))
{
trigger_error("delete empty and non-referenced link $name ($id)", E_USER_NOTICE);
$dbh->Execute("DELETE FROM $page_tbl WHERE id=$id"); // this purges the link
$dbh->Execute("DELETE FROM $recent_tbl WHERE id=$id"); // may fail
}
}
}
$this->unlock(array('link'));
return true;
}
/**
* Find pages which link to or are linked from a page.
*
* Optimization: save request->_dbi->_iwpcache[] to avoid further iswikipage checks
* (linkExistingWikiWord or linkUnknownWikiWord)
* This is called on every page header GleanDescription, so we can store all the
* existing links.
*
* relations: $backend->get_links is responsible to add the relation to the pagehash
* as 'linkrelation' key as pagename. See WikiDB_PageIterator::next
* if (isset($next['linkrelation']))
*/
function get_links($pagename, $reversed=true, $include_empty=false,
$sortby='', $limit='', $exclude='',
$want_relations = false)
{
$dbh = &$this->_dbh;
extract($this->_table_names);
if ($reversed)
list($have,$want) = array('linkee', 'linker');
else
list($have,$want) = array('linker', 'linkee');
$orderby = $this->sortby($sortby, 'db', array('pagename'));
if ($orderby) $orderby = " ORDER BY $want." . $orderby;
if ($exclude) // array of pagenames
$exclude = " AND $want.pagename NOT IN ".$this->_sql_set($exclude);
else
$exclude='';
$qpagename = $dbh->qstr($pagename);
// removed ref to FETCH_MODE in next line
$sql = "SELECT $want.id AS id, $want.pagename AS pagename, "
. ($want_relations ? " related.pagename as linkrelation" : " $want.hits AS hits")
. " FROM "
. (!$include_empty ? "$nonempty_tbl, " : '')
. " $page_tbl linkee, $page_tbl linker, $link_tbl "
. ($want_relations ? " JOIN $page_tbl related ON ($link_tbl.relation=related.id)" : '')
. " WHERE linkfrom=linker.id AND linkto=linkee.id"
. " AND $have.pagename=$qpagename"
. (!$include_empty ? " AND $nonempty_tbl.id=$want.id" : "")
//. " GROUP BY $want.id"
. $exclude
. $orderby;
/*
echo "SELECT linkee.id AS id, linkee.pagename AS pagename, related.pagename as linkrelation FROM link, page linkee, page linker JOIN page related ON (link.relation=related.id) WHERE linkfrom=linker.id AND linkto=linkee.id AND linker.pagename='SanDiego'" | mysql phpwiki
id pagename linkrelation
2268 California located_in
*/
if ($limit) {
// extract from,count from limit
list($offset,$count) = $this->limit($limit);
$result = $dbh->SelectLimit($sql, $count, $offset);
} else {
$result = $dbh->Execute($sql);
}
$fields = $this->links_field_list;
if ($want_relations) // instead of hits
$fields[2] = 'linkrelation';
return new WikiDB_backend_ADODB_iter($this, $result, $fields);
}
/**
* Find if a page links to another page
*/
function exists_link($pagename, $link, $reversed=false) {
$dbh = &$this->_dbh;
extract($this->_table_names);
if ($reversed)
list($have, $want) = array('linkee', 'linker');
else
list($have, $want) = array('linker', 'linkee');
$qpagename = $dbh->qstr($pagename);
$qlink = $dbh->qstr($link);
$row = $dbh->GetRow("SELECT CASE WHEN $want.pagename=$qlink THEN 1 ELSE 0 END"
. " FROM $link_tbl, $page_tbl linker, $page_tbl linkee, $nonempty_tbl"
. " WHERE linkfrom=linker.id AND linkto=linkee.id"
. " AND $have.pagename=$qpagename"
. " AND $want.pagename=$qlink");
return $row[0];
}
/*
*
*/
function get_all_pages($include_empty=false, $sortby='', $limit='', $exclude='') {
$dbh = &$this->_dbh;
extract($this->_table_names);
$orderby = $this->sortby($sortby, 'db');
if ($orderby) $orderby = ' ORDER BY ' . $orderby;
$and = '';
if ($exclude) {// array of pagenames
$and = ' AND ';
$exclude = " $page_tbl.pagename NOT IN ".$this->_sql_set($exclude);
} else {
$exclude='';
}
//$dbh->SetFetchMode(ADODB_FETCH_ASSOC);
if (strstr($orderby, 'mtime ')) { // was ' mtime'
if ($include_empty) {
$sql = "SELECT "
. $this->page_tbl_fields
." FROM $page_tbl, $recent_tbl, $version_tbl"
. " WHERE $page_tbl.id=$recent_tbl.id"
. " AND $page_tbl.id=$version_tbl.id AND latestversion=version"
. " $and$exclude"
. $orderby;
}
else {
$sql = "SELECT "
. $this->page_tbl_fields
. " FROM $nonempty_tbl, $page_tbl, $recent_tbl, $version_tbl"
. " WHERE $nonempty_tbl.id=$page_tbl.id"
. " AND $page_tbl.id=$recent_tbl.id"
. " AND $page_tbl.id=$version_tbl.id AND latestversion=version"
. " $and$exclude"
. $orderby;
}
} else {
if ($include_empty) {
$sql = "SELECT "
. $this->page_tbl_fields
. " FROM $page_tbl"
. ($exclude ? " WHERE $exclude" : '')
. $orderby;
} else {
$sql = "SELECT "
. $this->page_tbl_fields
. " FROM $nonempty_tbl, $page_tbl"
. " WHERE $nonempty_tbl.id=$page_tbl.id"
. " $and$exclude"
. $orderby;
}
}
if ($limit) {
// extract from,count from limit
list($offset,$count) = $this->limit($limit);
$result = $dbh->SelectLimit($sql, $count, $offset);
} else {
$result = $dbh->Execute($sql);
}
//$dbh->SetFetchMode(ADODB_FETCH_NUM);
return new WikiDB_backend_ADODB_iter($this, $result, $this->page_tbl_field_list);
}
/**
* Title and fulltext search.
*/
function text_search($search, $fullsearch=false,
$sortby='', $limit='', $exclude='')
{
$dbh = &$this->_dbh;
extract($this->_table_names);
$orderby = $this->sortby($sortby, 'db');
if ($orderby) $orderby = ' ORDER BY ' . $orderby;
$table = "$nonempty_tbl, $page_tbl";
$join_clause = "$nonempty_tbl.id=$page_tbl.id";
$fields = $this->page_tbl_fields;
$field_list = $this->page_tbl_field_list;
$searchobj = new WikiDB_backend_ADODB_search($search, $dbh);
if ($fullsearch) {
$table .= ", $recent_tbl";
$join_clause .= " AND $page_tbl.id=$recent_tbl.id";
$table .= ", $version_tbl";
$join_clause .= " AND $page_tbl.id=$version_tbl.id AND latestversion=version";
$fields .= ",$page_tbl.pagedata as pagedata," . $this->version_tbl_fields;
$field_list = array_merge($field_list, array('pagedata'),
$this->version_tbl_field_list);
$callback = new WikiMethodCb($searchobj, "_fulltext_match_clause");
} else {
$callback = new WikiMethodCb($searchobj, "_pagename_match_clause");
}
$search_clause = $search->makeSqlClauseObj($callback);
$sql = "SELECT $fields FROM $table"
. " WHERE $join_clause"
. " AND ($search_clause)"
. $orderby;
if ($limit) {
// extract from,count from limit
list($offset,$count) = $this->limit($limit);
$result = $dbh->SelectLimit($sql, $count, $offset);
} else {
$result = $dbh->Execute($sql);
}
$iter = new WikiDB_backend_ADODB_iter($this, $result, $field_list);
if ($fullsearch)
$iter->stoplisted = $searchobj->stoplisted;
return $iter;
}
/*
* TODO: efficiently handle wildcards exclusion: exclude=Php* => 'Php%',
* not sets. See above, but the above methods find too much.
* This is only for already resolved wildcards:
* " WHERE $page_tbl.pagename NOT IN ".$this->_sql_set(array('page1','page2'));
*/
function _sql_set(&$pagenames) {
$s = '(';
foreach ($pagenames as $p) {
$s .= ($this->_dbh->qstr($p).",");
}
return substr($s,0,-1).")";
}
/**
* Find highest or lowest hit counts.
*/
function most_popular($limit=20, $sortby='-hits') {
$dbh = &$this->_dbh;
extract($this->_table_names);
$order = "DESC";
if ($limit < 0){
$order = "ASC";
$limit = -$limit;
$where = "";
} else {
$where = " AND hits > 0";
}
if ($sortby != '-hits') {
if ($order = $this->sortby($sortby, 'db')) $orderby = " ORDER BY " . $order;
else $orderby = "";
} else
$orderby = " ORDER BY hits $order";
$sql = "SELECT "
. $this->page_tbl_fields
. " FROM $nonempty_tbl, $page_tbl"
. " WHERE $nonempty_tbl.id=$page_tbl.id"
. $where
. $orderby;
if ($limit) {
// extract from,count from limit
list($offset,$count) = $this->limit($limit);
$result = $dbh->SelectLimit($sql, $count, $offset);
} else {
$result = $dbh->Execute($sql);
}
return new WikiDB_backend_ADODB_iter($this, $result, $this->page_tbl_field_list);
}
/**
* Find recent changes.
*/
function most_recent($params) {
$limit = 0;
$since = 0;
$include_minor_revisions = false;
$exclude_major_revisions = false;
$include_all_revisions = false;
extract($params);
$dbh = &$this->_dbh;
extract($this->_table_names);
$pick = array();
if ($since)
$pick[] = "mtime >= $since";
if ($include_all_revisions) {
// Include all revisions of each page.
$table = "$page_tbl, $version_tbl";
$join_clause = "$page_tbl.id=$version_tbl.id";
if ($exclude_major_revisions) {
// Include only minor revisions
$pick[] = "minor_edit <> 0";
}
elseif (!$include_minor_revisions) {
// Include only major revisions
$pick[] = "minor_edit = 0";
}
}
else {
$table = "$page_tbl, $recent_tbl";
$join_clause = "$page_tbl.id=$recent_tbl.id";
$table .= ", $version_tbl";
$join_clause .= " AND $version_tbl.id=$page_tbl.id";
if ($exclude_major_revisions) {
// Include only most recent minor revision
$pick[] = 'version=latestminor';
}
elseif (!$include_minor_revisions) {
// Include only most recent major revision
$pick[] = 'version=latestmajor';
}
else {
// Include only the latest revision (whether major or minor).
$pick[] ='version=latestversion';
}
}
$order = "DESC";
if($limit < 0){
$order = "ASC";
$limit = -$limit;
}
$where_clause = $join_clause;
if ($pick)
$where_clause .= " AND " . join(" AND ", $pick);
$sql = "SELECT "
. $this->page_tbl_fields . ", " . $this->version_tbl_fields
. " FROM $table"
. " WHERE $where_clause"
. " ORDER BY mtime $order";
// FIXME: use SQL_BUFFER_RESULT for mysql?
if ($limit) {
// extract from,count from limit
list($offset,$count) = $this->limit($limit);
$result = $dbh->SelectLimit($sql, $count, $offset);
} else {
$result = $dbh->Execute($sql);
}
//$result->fields['version'] = $result->fields[6];
return new WikiDB_backend_ADODB_iter($this, $result,
array_merge($this->page_tbl_field_list, $this->version_tbl_field_list));
}
/**
* Find referenced empty pages.
*/
function wanted_pages($exclude_from='', $exclude='', $sortby='', $limit='') {
$dbh = &$this->_dbh;
extract($this->_table_names);
if ($orderby = $this->sortby($sortby, 'db', array('pagename','wantedfrom')))
$orderby = 'ORDER BY ' . $orderby;
if ($exclude_from) // array of pagenames
$exclude_from = " AND pp.pagename NOT IN ".$this->_sql_set($exclude_from);
if ($exclude) // array of pagenames
$exclude = " AND p.pagename NOT IN ".$this->_sql_set($exclude);
/*
all empty pages, independent of linkstatus:
select pagename as empty from page left join nonempty using(id) where is null(nonempty.id);
only all empty pages, which have a linkto:
select page.pagename, linked.pagename as wantedfrom from link, page linked
left join page on link.linkto=page.id left join nonempty on link.linkto=nonempty.id
where nonempty.id is null and linked.id=link.linkfrom;
*/
$sql = "SELECT p.pagename, pp.pagename as wantedfrom"
. " FROM $page_tbl p, $link_tbl linked"
. " LEFT JOIN $page_tbl pp ON (linked.linkto = pp.id)"
. " LEFT JOIN $nonempty_tbl ne ON (linked.linkto = ne.id)"
. " WHERE ne.id is NULL"
. " AND (p.id = linked.linkfrom)"
. $exclude_from
. $exclude
. $orderby;
if ($limit) {
// extract from,count from limit
list($offset,$count) = $this->limit($limit);
$result = $dbh->SelectLimit($sql, $count, $offset);
} else {
$result = $dbh->Execute($sql);
}
return new WikiDB_backend_ADODB_iter($this, $result, array('pagename','wantedfrom'));
}
/**
* Rename page in the database.
*/
function rename_page($pagename, $to) {
$dbh = &$this->_dbh;
extract($this->_table_names);
$this->lock(array('page','version','recent','nonempty','link'));
if ( ($id = $this->_get_pageid($pagename, false)) ) {
if ($new = $this->_get_pageid($to, false)) {
// Cludge Alert!
// This page does not exist (already verified before), but exists in the page table.
// So we delete this page.
$dbh->query("DELETE FROM $page_tbl WHERE id=$new");
$dbh->query("DELETE FROM $version_tbl WHERE id=$new");
$dbh->query("DELETE FROM $recent_tbl WHERE id=$new");
$dbh->query("DELETE FROM $nonempty_tbl WHERE id=$new");
// We have to fix all referring tables to the old id
$dbh->query("UPDATE $link_tbl SET linkfrom=$id WHERE linkfrom=$new");
$dbh->query("UPDATE $link_tbl SET linkto=$id WHERE linkto=$new");
}
$dbh->query(sprintf("UPDATE $page_tbl SET pagename=%s WHERE id=$id",
$dbh->qstr($to)));
}
$this->unlock(array('page'));
return $id;
}
function _update_recent_table($pageid = false) {
$dbh = &$this->_dbh;
extract($this->_table_names);
extract($this->_expressions);
$pageid = (int)$pageid;
// optimize: mysql can do this with one REPLACE INTO.
$backend_type = $this->backendType();
if (substr($backend_type,0,5) == 'mysql') {
$dbh->Execute("REPLACE INTO $recent_tbl"
. " (id, latestversion, latestmajor, latestminor)"
. " SELECT id, $maxversion, $maxmajor, $maxminor"
. " FROM $version_tbl"
. ( $pageid ? " WHERE id=$pageid" : "")
. " GROUP BY id" );
} else {
$this->lock(array('recent'));
$dbh->Execute("DELETE FROM $recent_tbl"
. ( $pageid ? " WHERE id=$pageid" : ""));
$dbh->Execute( "INSERT INTO $recent_tbl"
. " (id, latestversion, latestmajor, latestminor)"
. " SELECT id, $maxversion, $maxmajor, $maxminor"
. " FROM $version_tbl"
. ( $pageid ? " WHERE id=$pageid" : "")
. " GROUP BY id" );
$this->unlock(array('recent'));
}
}
function _update_nonempty_table($pageid = false) {
$dbh = &$this->_dbh;
extract($this->_table_names);
extract($this->_expressions);
$pageid = (int)$pageid;
extract($this->_expressions);
$this->lock(array('nonempty'));
$dbh->Execute("DELETE FROM $nonempty_tbl"
. ( $pageid ? " WHERE id=$pageid" : ""));
$dbh->Execute("INSERT INTO $nonempty_tbl (id)"
. " SELECT $recent_tbl.id"
. " FROM $recent_tbl, $version_tbl"
. " WHERE $recent_tbl.id=$version_tbl.id"
. " AND version=latestversion"
// We have some specifics here (Oracle)
//. " AND content<>''"
. " AND content $notempty" // On Oracle not just "<>''"
. ( $pageid ? " AND $recent_tbl.id=$pageid" : ""));
$this->unlock(array('nonempty'));
}
/**
* Grab a write lock on the tables in the SQL database.
*
* Calls can be nested. The tables won't be unlocked until
* _unlock_database() is called as many times as _lock_database().
*
* @access protected
*/
function lock($tables, $write_lock = true) {
$this->_dbh->StartTrans();
if ($this->_lock_count++ == 0) {
$this->_current_lock = $tables;
$this->_lock_tables($tables, $write_lock);
}
}
/**
* Overridden by non-transaction safe backends.
*/
function _lock_tables($tables, $write_lock) {
return $this->_current_lock;
}
/**
* Release a write lock on the tables in the SQL database.
*
* @access protected
*
* @param $force boolean Unlock even if not every call to lock() has been matched
* by a call to unlock().
*
* @see _lock_database
*/
function unlock($tables = false, $force = false) {
if ($this->_lock_count == 0) {
$this->_current_lock = false;
return;
}
if (--$this->_lock_count <= 0 || $force) {
$this->_unlock_tables($tables, $force);
$this->_current_lock = false;
$this->_lock_count = 0;
}
$this->_dbh->CompleteTrans(! $force);
}
/**
* overridden by non-transaction safe backends
*/
function _unlock_tables($tables, $write_lock=false) {
return;
}
/**
* Serialize data
*/
function _serialize($data) {
if (empty($data))
return '';
assert(is_array($data));
return serialize($data);
}
/**
* Unserialize data
*/
function _unserialize($data) {
return empty($data) ? array() : unserialize($data);
}
/* some variables and functions for DB backend abstraction (action=upgrade) */
function database () {
return $this->_dbh->database;
}
function backendType() {
return $this->_dbh->databaseType;
}
function connection() {
return $this->_dbh->_connectionID;
}
function getRow($query) {
return $this->_dbh->getRow($query);
}
function listOfTables() {
return $this->_dbh->MetaTables();
}
// other database needs another connection and other privileges.
function listOfFields($database, $table) {
$field_list = array();
$old_db = $this->database();
if ($database != $old_db) {
$conn = $this->_dbh->Connect($this->_parsedDSN['hostspec'],
DBADMIN_USER ? DBADMIN_USER : $this->_parsedDSN['username'],
DBADMIN_PASSWD ? DBADMIN_PASSWD : $this->_parsedDSN['password'],
$database);
}
foreach ($this->_dbh->MetaColumns($table, false) as $field) {
$field_list[] = $field->name;
}
if ($database != $old_db) {
$this->_dbh->close();
$conn = $this->_dbh->Connect($this->_parsedDSN['hostspec'],
$this->_parsedDSN['username'],
$this->_parsedDSN['password'],
$old_db);
}
return $field_list;
}
};
class WikiDB_backend_ADODB_generic_iter
extends WikiDB_backend_iterator
{
function WikiDB_backend_ADODB_generic_iter($backend, $query_result, $field_list = NULL) {
$this->_backend = &$backend;
$this->_result = $query_result;
if (is_null($field_list)) {
// No field list passed, retrieve from DB
// WikiLens is using the iterator behind the scene
$field_list = array();
$fields = $query_result->FieldCount();
for ($i = 0; $i < $fields ; $i++) {
$field_info = $query_result->FetchField($i);
array_push($field_list, $field_info->name);
}
}
$this->_fields = $field_list;
}
function count() {
if (!$this->_result) {
return false;
}
$count = $this->_result->numRows();
//$this->_result->Close();
return $count;
}
function next() {
$result = &$this->_result;
$backend = &$this->_backend;
if (!$result || $result->EOF) {
$this->free();
return false;
}
// Convert array to hash
$i = 0;
$rec_num = $result->fields;
foreach ($this->_fields as $field) {
$rec_assoc[$field] = $rec_num[$i++];
}
// check if the cache can be populated here?
$result->MoveNext();
return $rec_assoc;
}
function reset () {
if ($this->_result) {
$this->_result->MoveFirst();
}
}
function asArray () {
$result = array();
while ($page = $this->next())
$result[] = $page;
return $result;
}
function free () {
if ($this->_result) {
/* call mysql_free_result($this->_queryID) */
$this->_result->Close();
$this->_result = false;
}
}
}
class WikiDB_backend_ADODB_iter
extends WikiDB_backend_ADODB_generic_iter
{
function next() {
$result = &$this->_result;
$backend = &$this->_backend;
if (!$result || $result->EOF) {
$this->free();
return false;
}
// Convert array to hash
$i = 0;
$rec_num = $result->fields;
foreach ($this->_fields as $field) {
$rec_assoc[$field] = $rec_num[$i++];
}
$result->MoveNext();
if (isset($rec_assoc['pagedata']))
$rec_assoc['pagedata'] = $backend->_extract_page_data($rec_assoc['pagedata'], $rec_assoc['hits']);
if (!empty($rec_assoc['version'])) {
$rec_assoc['versiondata'] = $backend->_extract_version_data_assoc($rec_assoc);
}
if (!empty($rec_assoc['linkrelation'])) {
$rec_assoc['linkrelation'] = $rec_assoc['linkrelation']; // pagename enough?
}
return $rec_assoc;
}
}
class WikiDB_backend_ADODB_search extends WikiDB_backend_search_sql
{
// no surrounding quotes because we know it's a string
// function _quote($word) { return $this->_dbh->escapeSimple($word); }
}
// Following function taken from Pear::DB (prev. from adodb-pear.inc.php).
// Eventually, change index.php to provide the relevant information
// directly?
/**
* Parse a data source name.
*
* Additional keys can be added by appending a URI query string to the
* end of the DSN.
*
* The format of the supplied DSN is in its fullest form:
*
* phptype(dbsyntax)://username:password@protocol+hostspec/database?option=8&another=true
*
*
* Most variations are allowed:
*
* phptype://username:password@protocol+hostspec:110//usr/db_file.db?mode=0644
* phptype://username:password@hostspec/database_name
* phptype://username:password@hostspec
* phptype://username@hostspec
* phptype://hostspec/database
* phptype://hostspec
* phptype(dbsyntax)
* phptype
*
*
* @param string $dsn Data Source Name to be parsed
*
* @return array an associative array with the following keys:
* + phptype: Database backend used in PHP (mysql, odbc etc.)
* + dbsyntax: Database used with regards to SQL syntax etc.
* + protocol: Communication protocol to use (tcp, unix etc.)
* + hostspec: Host specification (hostname[:port])
* + database: Database to use on the DBMS server
* + username: User name for login
* + password: Password for login
*
* @author Tomas V.V.Cox
*/
function parseDSN($dsn)
{
$parsed = array(
'phptype' => false,
'dbsyntax' => false,
'username' => false,
'password' => false,
'protocol' => false,
'hostspec' => false,
'port' => false,
'socket' => false,
'database' => false,
);
if (is_array($dsn)) {
$dsn = array_merge($parsed, $dsn);
if (!$dsn['dbsyntax']) {
$dsn['dbsyntax'] = $dsn['phptype'];
}
return $dsn;
}
// Find phptype and dbsyntax
if (($pos = strpos($dsn, '://')) !== false) {
$str = substr($dsn, 0, $pos);
$dsn = substr($dsn, $pos + 3);
} else {
$str = $dsn;
$dsn = null;
}
// Get phptype and dbsyntax
// $str => phptype(dbsyntax)
if (preg_match('|^(.+?)\((.*?)\)$|', $str, $arr)) {
$parsed['phptype'] = $arr[1];
$parsed['dbsyntax'] = !$arr[2] ? $arr[1] : $arr[2];
} else {
$parsed['phptype'] = $str;
$parsed['dbsyntax'] = $str;
}
if (!count($dsn)) {
return $parsed;
}
// Get (if found): username and password
// $dsn => username:password@protocol+hostspec/database
if (($at = strrpos($dsn,'@')) !== false) {
$str = substr($dsn, 0, $at);
$dsn = substr($dsn, $at + 1);
if (($pos = strpos($str, ':')) !== false) {
$parsed['username'] = rawurldecode(substr($str, 0, $pos));
$parsed['password'] = rawurldecode(substr($str, $pos + 1));
} else {
$parsed['username'] = rawurldecode($str);
}
}
// Find protocol and hostspec
// $dsn => proto(proto_opts)/database
if (preg_match('|^([^(]+)\((.*?)\)/?(.*?)$|', $dsn, $match)) {
$proto = $match[1];
$proto_opts = $match[2] ? $match[2] : false;
$dsn = $match[3];
// $dsn => protocol+hostspec/database (old format)
} else {
if (strpos($dsn, '+') !== false) {
list($proto, $dsn) = explode('+', $dsn, 2);
}
if (strpos($dsn, '/') !== false) {
list($proto_opts, $dsn) = explode('/', $dsn, 2);
} else {
$proto_opts = $dsn;
$dsn = null;
}
}
// process the different protocol options
$parsed['protocol'] = (!empty($proto)) ? $proto : 'tcp';
$proto_opts = rawurldecode($proto_opts);
if ($parsed['protocol'] == 'tcp') {
if (strpos($proto_opts, ':') !== false) {
list($parsed['hostspec'], $parsed['port']) = explode(':', $proto_opts);
} else {
$parsed['hostspec'] = $proto_opts;
}
} elseif ($parsed['protocol'] == 'unix') {
$parsed['socket'] = $proto_opts;
}
// Get dabase if any
// $dsn => database
if ($dsn) {
// /database
if (($pos = strpos($dsn, '?')) === false) {
$parsed['database'] = $dsn;
// /database?param1=value1¶m2=value2
} else {
$parsed['database'] = substr($dsn, 0, $pos);
$dsn = substr($dsn, $pos + 1);
if (strpos($dsn, '&') !== false) {
$opts = explode('&', $dsn);
} else { // database?param1=value1
$opts = array($dsn);
}
foreach ($opts as $opt) {
list($key, $value) = explode('=', $opt);
if (!isset($parsed[$key])) {
// don't allow params overwrite
$parsed[$key] = rawurldecode($value);
}
}
}
}
return $parsed;
}
// Local Variables:
// mode: php
// tab-width: 8
// c-basic-offset: 4
// c-hanging-comment-ender-p: nil
// indent-tabs-mode: nil
// End:
?>