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<?php
/**
* Support functions for cleaning up redundant text records
*
* @file
* @ingroup Maintenance
* @author Rob Church <robchur@gmail.com>
*/
function PurgeRedundantText( $delete = false ) {
# Data should come off the master, wrapped in a transaction
$dbw = wfGetDB( DB_MASTER );
$dbw->begin();
$tbl_arc = $dbw->tableName( 'archive' );
$tbl_rev = $dbw->tableName( 'revision' );
$tbl_txt = $dbw->tableName( 'text' );
# Get "active" text records from the revisions table
echo( "Searching for active text records in revisions table..." );
$res = $dbw->query( "SELECT DISTINCTROW rev_text_id FROM $tbl_rev" );
while( $row = $dbw->fetchObject( $res ) ) {
$cur[] = $row->rev_text_id;
}
echo( "done.\n" );
# Get "active" text records from the archive table
echo( "Searching for active text records in archive table..." );
$res = $dbw->query( "SELECT DISTINCTROW ar_text_id FROM $tbl_arc" );
while( $row = $dbw->fetchObject( $res ) ) {
$cur[] = $row->ar_text_id;
}
echo( "done.\n" );
# Get the IDs of all text records not in these sets
echo( "Searching for inactive text records..." );
$set = implode( ', ', $cur );
$res = $dbw->query( "SELECT old_id FROM $tbl_txt WHERE old_id NOT IN ( $set )" );
$old = array();
while( $row = $dbw->fetchObject( $res ) ) {
$old[] = $row->old_id;
}
echo( "done.\n" );
# Inform the user of what we're going to do
$count = count( $old );
echo( "$count inactive items found.\n" );
# Delete as appropriate
if( $delete && $count ) {
echo( "Deleting..." );
$set = implode( ', ', $old );
$dbw->query( "DELETE FROM $tbl_txt WHERE old_id IN ( $set )" );
echo( "done.\n" );
}
# Done
$dbw->commit();
}
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