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<?php
define( 'BATCH_SIZE', 200 );
function populate_rev_parent_id( $db ) {
wfOut( "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 ) ){
wfOut( "...revision table seems to be empty.\n" );
$db->insert( 'updatelog',
array( 'ul_key' => 'populate rev_parent_id' ),
__FUNCTION__,
'IGNORE' );
return;
}
# Do remaining chunk
$end += BATCH_SIZE - 1;
$blockStart = intval( $start );
$blockEnd = intval( $start ) + BATCH_SIZE - 1;
$count = 0;
$changed = 0;
while( $blockEnd <= $end ) {
wfOut( "...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'),
$cond, __FUNCTION__ );
# 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( $row->rev_id ) ),
__FUNCTION__,
array( 'ORDER BY' => 'rev_id DESC' ) );
# If there are none, check the the highest ID with a lower timestamp
if( !$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 ) ),
__FUNCTION__,
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 ),
__FUNCTION__,
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 ),
__FUNCTION__ );
$count++;
}
$blockStart += BATCH_SIZE - 1;
$blockEnd += BATCH_SIZE - 1;
wfWaitForSlaves( 5 );
}
$logged = $db->insert( 'updatelog',
array( 'ul_key' => 'populate rev_parent_id' ),
__FUNCTION__,
'IGNORE' );
if( $logged ) {
wfOut( "rev_parent_id population complete ... {$count} rows [{$changed} changed]\n" );
return true;
} else {
wfOut( "Could not insert rev_parent_id population row.\n" );
return false;
}
}
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