From: Aaron Schulz <aaron@users.mediawiki.org>
Date: Tue, 8 Apr 2008 01:09:39 +0000 (+0000)
Subject: Add a script to populate rev_parent_id
X-Git-Tag: 1.31.0-rc.0~48549
X-Git-Url: http://git.cyclocoop.org/%22.%24h.%22?a=commitdiff_plain;h=7a16b211300cf1851ac40e1ef0d4e4cea578dcec;p=lhc%2Fweb%2Fwiklou.git

Add a script to populate rev_parent_id
---

diff --git a/maintenance/populateParentId.php b/maintenance/populateParentId.php
new file mode 100644
index 0000000000..84e99dd882
--- /dev/null
+++ b/maintenance/populateParentId.php
@@ -0,0 +1,62 @@
+<?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.
+ */
+
+define( 'BATCH_SIZE', 100 );
+
+require_once 'commandLine.inc';
+	
+$db =& wfGetDB( DB_MASTER );
+if ( !$db->tableExists( 'revision' ) ) {
+	echo "revision table does not exist\n";
+	exit( 1 );
+}
+
+populate_rev_parent_id( $db );
+
+function populate_rev_parent_id( $db ) {
+	echo "Populating rev_parent_id column\n";
+	$start = $db->selectField( 'revision', 'MIN(rev_id)', false, __FUNCTION__ );
+	$end = $db->selectField( 'revision', 'MAX(rev_id)', false, __FUNCTION__ );
+	$blockStart = $start;
+	$blockEnd = $start + BATCH_SIZE - 1;
+	while( $blockEnd <= $end ) {
+		$cond = "rev_id BETWEEN $blockStart AND $blockEnd";
+		$res = $db->select( 'revision', array('rev_id', 'rev_page'), $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...
+		while( $row = $db->fetchObject( $res ) ) {
+			$previousID = $db->selectField( 'revision', 'rev_id', 
+				array( 'rev_page' => $row->rev_page, 'rev_id < ' . $row->rev_id ), 
+				__FUNCTION__,
+				array( 'ORDER BY' => 'rev_id DESC' ) );
+			# Update the row...
+			$db->update( 'revision',
+				array( 'rev_parent_id' => intval($previousID) ),
+				array( 'rev_page' => $row->rev_page, 'rev_id' => $row->rev_id ),
+				__FUNCTION__ );
+		}
+		$blockStart += BATCH_SIZE;
+		$blockEnd += BATCH_SIZE;
+		wfWaitForSlaves( 5 );
+	}
+	$logged = $db->insert( 'updatelog',
+		array( 'ul_key' => 'populate rev_parent_id' ),
+		__FUNCTION__,
+		'IGNORE' );
+	if( $logged ) {
+		echo "rev_parent_id population complete\n";
+		return true;
+	} else {
+		echo "Could not insert rev_parent_id population row.\n";
+		return false;
+	}
+}
+
+
diff --git a/maintenance/updaters.inc b/maintenance/updaters.inc
index 1b434439ab..56aa5f8ff4 100644
--- a/maintenance/updaters.inc
+++ b/maintenance/updaters.inc
@@ -135,6 +135,7 @@ $wgMysqlUpdates = array(
 	array( 'add_table', 'updatelog',                         'patch-updatelog.sql' ),
 	array( 'add_table', 'category',                          'patch-category.sql' ),
 	array( 'do_category_population' ),
+	array( 'do_populate_parent_id' ),
 );
 
 
@@ -1151,6 +1152,14 @@ function do_category_population() {
 	echo "Done populating category table.\n";
 }
 
+function do_populate_parent_id() {
+	if( update_row_exists( 'populate rev_parent_id' ) ) {
+		echo "...rev_parent_id column already populated.\n";
+		return;
+	}
+	require_once( 'populateParentId.inc' );
+}
+
 function
 pg_describe_table($table)
 {