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<?php
/**
* Makes the required database updates for rev_parent_id
* to be of any use. It can be used for some simple tracking
* and to find new page edits by users.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Maintenance
*/
require_once __DIR__ . '/Maintenance.php';
/**
* Maintenance script that makes the required database updates for rev_parent_id
* to be of any use.
*
* @ingroup Maintenance
*/
class PopulateParentId extends LoggedUpdateMaintenance {
public function __construct() {
parent::__construct();
$this->mDescription = "Populates rev_parent_id";
}
protected function getUpdateKey() {
return 'populate rev_parent_id';
}
protected function updateSkippedMessage() {
return 'rev_parent_id column of revision table already populated.';
}
protected function doDBUpdates() {
$db = wfGetDB( DB_MASTER );
if ( !$db->tableExists( 'revision' ) ) {
$this->error( "revision table does not exist" );
return false;
}
$this->output( "Populating rev_parent_id column\n" );
$start = $db->selectField( 'revision', 'MIN(rev_id)', false, __FUNCTION__ );
$end = $db->selectField( 'revision', 'MAX(rev_id)', false, __FUNCTION__ );
if ( is_null( $start ) || is_null( $end ) ) {
$this->output( "...revision table seems to be empty, nothing to do.\n" );
return true;
}
# Do remaining chunk
$blockStart = intval( $start );
$blockEnd = intval( $start ) + $this->mBatchSize - 1;
$count = 0;
$changed = 0;
while ( $blockStart <= $end ) {
$this->output( "...doing rev_id from $blockStart to $blockEnd\n" );
$cond = "rev_id BETWEEN $blockStart AND $blockEnd";
$res = $db->select( 'revision',
array( 'rev_id', 'rev_page', 'rev_timestamp', 'rev_parent_id' ),
array( $cond, 'rev_parent_id' => null ), __METHOD__ );
# Go through and update rev_parent_id from these rows.
# Assume that the previous revision of the title was
# the original previous revision of the title when the
# edit was made...
foreach ( $res as $row ) {
# First, check rows with the same timestamp other than this one
# with a smaller rev ID. The highest ID "wins". This avoids loops
# as timestamp can only decrease and never loops with IDs (from parent to parent)
$previousID = $db->selectField( 'revision', 'rev_id',
array( 'rev_page' => $row->rev_page, 'rev_timestamp' => $row->rev_timestamp,
"rev_id < " . intval( $row->rev_id ) ),
__METHOD__,
array( 'ORDER BY' => 'rev_id DESC' ) );
# If there are none, check the the highest ID with a lower timestamp
if ( !$previousID ) {
# Get the highest older timestamp
$lastTimestamp = $db->selectField( 'revision', 'rev_timestamp',
array( 'rev_page' => $row->rev_page, "rev_timestamp < " . $db->addQuotes( $row->rev_timestamp ) ),
__METHOD__,
array( 'ORDER BY' => 'rev_timestamp DESC' ) );
# If there is one, let the highest rev ID win
if ( $lastTimestamp ) {
$previousID = $db->selectField( 'revision', 'rev_id',
array( 'rev_page' => $row->rev_page, 'rev_timestamp' => $lastTimestamp ),
__METHOD__,
array( 'ORDER BY' => 'rev_id DESC' ) );
}
}
$previousID = intval( $previousID );
if ( $previousID != $row->rev_parent_id ) {
$changed++;
}
# Update the row...
$db->update( 'revision',
array( 'rev_parent_id' => $previousID ),
array( 'rev_id' => $row->rev_id ),
__METHOD__ );
$count++;
}
$blockStart += $this->mBatchSize;
$blockEnd += $this->mBatchSize;
wfWaitForSlaves();
}
$this->output( "rev_parent_id population complete ... {$count} rows [{$changed} changed]\n" );
return true;
}
}
$maintClass = "PopulateParentId";
require_once RUN_MAINTENANCE_IF_MAIN;
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