maintenance/populateParentId.php

   1 <?php
   2
   3 /*
   4  * Makes the required database updates for rev_parent_id
   5  * to be of any use. It can be used for some simple tracking
   6  * and to find new page edits by users.
   7  */
   8
   9 define( 'BATCH_SIZE', 500 );
  10
  11 require_once 'commandLine.inc';
  12
  13 $db =& wfGetDB( DB_MASTER );
  14 if ( !$db->tableExists( 'revision' ) ) {
  15         echo "revision table does not exist\n";
  16         exit( 1 );
  17 }
  18
  19 populate_rev_parent_id( $db );
  20
  21 function populate_rev_parent_id( $db ) {
  22         echo "Populating rev_parent_id column\n";
  23         $start = $db->selectField( 'revision', 'MIN(rev_id)', false, __FUNCTION__ );
  24         $end = $db->selectField( 'revision', 'MAX(rev_id)', false, __FUNCTION__ );
  25         $blockStart = $start;
  26         $blockEnd = $start + BATCH_SIZE - 1;
  27         $count = 0;
  28         while( $blockEnd <= $end ) {
  29                 $cond = "rev_id BETWEEN $blockStart AND $blockEnd";
  30                 $res = $db->select( 'revision', array('rev_id','rev_page'), $cond, __FUNCTION__ );
  31                 # Go through and update rev_parent_id from these rows.
  32                 # Assume that the previous revision of the title was
  33                 # the original previous revision of the title when the
  34                 # edit was made...
  35                 foreach( $res as $row ) {
  36                         $previousID = $db->selectField( 'revision', 'rev_id',
  37                                 array( 'rev_page' => $row->rev_page, "rev_id < '{$row->rev_id}'" ),
  38                                 __FUNCTION__,
  39                                 array( 'ORDER BY' => 'rev_id DESC' ) );
  40                         # Update the row...
  41                         $db->update( 'revision',
  42                                 array( 'rev_parent_id' => intval($previousID) ),
  43                                 array( 'rev_id' => $row->rev_id ),
  44                                 __FUNCTION__ );
  45                         $count++;
  46                 }
  47                 $blockStart += BATCH_SIZE;
  48                 $blockEnd += BATCH_SIZE;
  49                 wfWaitForSlaves( 5 );
  50         }
  51         $logged = $db->insert( 'updatelog',
  52                 array( 'ul_key' => 'populate rev_parent_id' ),
  53                 __FUNCTION__,
  54                 'IGNORE' );
  55         if( $logged ) {
  56                 echo "rev_parent_id population complete ... {$count} rows\n";
  57                 return true;
  58         } else {
  59                 echo "Could not insert rev_parent_id population row.\n";
  60                 return false;
  61         }
  62 }
  63
  64