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<?php
/**
* @file
* @todo document
* @ingroup Maintenance
*/
/** */
function convertLinks() {
global $wgDBtype;
if( $wgDBtype == 'postgres' ) {
wfOut( "Links table already ok on Postgres.\n" );
return;
}
wfOut( "Converting links table to ID-ID...\n" );
global $wgLang, $wgDBserver, $wgDBadminuser, $wgDBadminpassword, $wgDBname;
global $noKeys, $logPerformance, $fh;
$tuplesAdded = $numBadLinks = $curRowsRead = 0; #counters etc
$totalTuplesInserted = 0; # total tuples INSERTed into links_temp
$reportCurReadProgress = true; #whether or not to give progress reports while reading IDs from cur table
$curReadReportInterval = 1000; #number of rows between progress reports
$reportLinksConvProgress = true; #whether or not to give progress reports during conversion
$linksConvInsertInterval = 1000; #number of rows per INSERT
$initialRowOffset = 0;
#$finalRowOffset = 0; # not used yet; highest row number from links table to process
# Overwrite the old links table with the new one. If this is set to false,
# the new table will be left at links_temp.
$overwriteLinksTable = true;
# Don't create keys, and so allow duplicates in the new links table.
# This gives a huge speed improvement for very large links tables which are MyISAM. (What about InnoDB?)
$noKeys = false;
$logPerformance = false; # output performance data to a file
$perfLogFilename = "convLinksPerf.txt";
#--------------------------------------------------------------------
$dbw = wfGetDB( DB_MASTER );
list ($cur, $links, $links_temp, $links_backup) = $dbw->tableNamesN( 'cur', 'links', 'links_temp', 'links_backup' );
$res = $dbw->query( "SELECT l_from FROM $links LIMIT 1" );
if ( $dbw->fieldType( $res, 0 ) == "int" ) {
wfOut( "Schema already converted\n" );
return;
}
$res = $dbw->query( "SELECT COUNT(*) AS count FROM $links" );
$row = $dbw->fetchObject($res);
$numRows = $row->count;
$dbw->freeResult( $res );
if ( $numRows == 0 ) {
wfOut( "Updating schema (no rows to convert)...\n" );
createTempTable();
} else {
if ( $logPerformance ) { $fh = fopen ( $perfLogFilename, "w" ); }
$baseTime = $startTime = getMicroTime();
# Create a title -> cur_id map
wfOut( "Loading IDs from $cur table...\n" );
performanceLog ( "Reading $numRows rows from cur table...\n" );
performanceLog ( "rows read vs seconds elapsed:\n" );
$dbw->bufferResults( false );
$res = $dbw->query( "SELECT cur_namespace,cur_title,cur_id FROM $cur" );
$ids = array();
while ( $row = $dbw->fetchObject( $res ) ) {
$title = $row->cur_title;
if ( $row->cur_namespace ) {
$title = $wgLang->getNsText( $row->cur_namespace ) . ":$title";
}
$ids[$title] = $row->cur_id;
$curRowsRead++;
if ($reportCurReadProgress) {
if (($curRowsRead % $curReadReportInterval) == 0) {
performanceLog( $curRowsRead . " " . (getMicroTime() - $baseTime) . "\n" );
wfOut( "\t$curRowsRead rows of $cur table read.\n" );
}
}
}
$dbw->freeResult( $res );
$dbw->bufferResults( true );
wfOut( "Finished loading IDs.\n\n" );
performanceLog( "Took " . (getMicroTime() - $baseTime) . " seconds to load IDs.\n\n" );
#--------------------------------------------------------------------
# Now, step through the links table (in chunks of $linksConvInsertInterval rows),
# convert, and write to the new table.
createTempTable();
performanceLog( "Resetting timer.\n\n" );
$baseTime = getMicroTime();
wfOut( "Processing $numRows rows from $links table...\n" );
performanceLog( "Processing $numRows rows from $links table...\n" );
performanceLog( "rows inserted vs seconds elapsed:\n" );
for ($rowOffset = $initialRowOffset; $rowOffset < $numRows; $rowOffset += $linksConvInsertInterval) {
$sqlRead = "SELECT * FROM $links ";
$sqlRead = $dbw->limitResult($sqlRead, $linksConvInsertInterval,$rowOffset);
$res = $dbw->query($sqlRead);
if ( $noKeys ) {
$sqlWrite = array("INSERT INTO $links_temp (l_from,l_to) VALUES ");
} else {
$sqlWrite = array("INSERT IGNORE INTO $links_temp (l_from,l_to) VALUES ");
}
$tuplesAdded = 0; # no tuples added to INSERT yet
while ( $row = $dbw->fetchObject($res) ) {
$fromTitle = $row->l_from;
if ( array_key_exists( $fromTitle, $ids ) ) { # valid title
$from = $ids[$fromTitle];
$to = $row->l_to;
if ( $tuplesAdded != 0 ) {
$sqlWrite[] = ",";
}
$sqlWrite[] = "($from,$to)";
$tuplesAdded++;
} else { # invalid title
$numBadLinks++;
}
}
$dbw->freeResult($res);
#wfOut( "rowOffset: $rowOffset\ttuplesAdded: $tuplesAdded\tnumBadLinks: $numBadLinks\n" );
if ( $tuplesAdded != 0 ) {
if ($reportLinksConvProgress) {
wfOut( "Inserting $tuplesAdded tuples into $links_temp..." );
}
$dbw->query( implode("",$sqlWrite) );
$totalTuplesInserted += $tuplesAdded;
if ($reportLinksConvProgress)
wfOut( " done. Total $totalTuplesInserted tuples inserted.\n" );
performanceLog( $totalTuplesInserted . " " . (getMicroTime() - $baseTime) . "\n" );
}
}
wfOut( "$totalTuplesInserted valid titles and $numBadLinks invalid titles were processed.\n\n" );
performanceLog( "$totalTuplesInserted valid titles and $numBadLinks invalid titles were processed.\n" );
performanceLog( "Total execution time: " . (getMicroTime() - $startTime) . " seconds.\n" );
if ( $logPerformance ) { fclose ( $fh ); }
}
#--------------------------------------------------------------------
if ( $overwriteLinksTable ) {
$dbConn = Database::newFromParams( $wgDBserver, $wgDBadminuser, $wgDBadminpassword, $wgDBname );
if (!($dbConn->isOpen())) {
wfOut( "Opening connection to database failed.\n" );
return;
}
# Check for existing links_backup, and delete it if it exists.
wfOut( "Dropping backup links table if it exists..." );
$dbConn->query( "DROP TABLE IF EXISTS $links_backup", DB_MASTER);
wfOut( " done.\n" );
# Swap in the new table, and move old links table to links_backup
wfOut( "Swapping tables '$links' to '$links_backup'; '$links_temp' to '$links'..." );
$dbConn->query( "RENAME TABLE links TO $links_backup, $links_temp TO $links", DB_MASTER );
wfOut( " done.\n\n" );
$dbConn->close();
wfOut( "Conversion complete. The old table remains at $links_backup;\n" );
wfOut( "delete at your leisure.\n" );
} else {
wfOut( "Conversion complete. The converted table is at $links_temp;\n" );
wfOut( "the original links table is unchanged.\n" );
}
}
#--------------------------------------------------------------------
function createTempTable() {
global $wgDBserver, $wgDBadminuser, $wgDBadminpassword, $wgDBname;
global $noKeys;
$dbConn = Database::newFromParams( $wgDBserver, $wgDBadminuser, $wgDBadminpassword, $wgDBname );
if (!($dbConn->isOpen())) {
wfOut( "Opening connection to database failed.\n" );
return;
}
$links_temp = $dbConn->tableName( 'links_temp' );
wfOut( "Dropping temporary links table if it exists..." );
$dbConn->query( "DROP TABLE IF EXISTS $links_temp");
wfOut( " done.\n" );
wfOut( "Creating temporary links table..." );
if ( $noKeys ) {
$dbConn->query( "CREATE TABLE $links_temp ( " .
"l_from int(8) unsigned NOT NULL default '0', " .
"l_to int(8) unsigned NOT NULL default '0')");
} else {
$dbConn->query( "CREATE TABLE $links_temp ( " .
"l_from int(8) unsigned NOT NULL default '0', " .
"l_to int(8) unsigned NOT NULL default '0', " .
"UNIQUE KEY l_from(l_from,l_to), " .
"KEY (l_to))");
}
wfOut( " done.\n\n" );
}
function performanceLog( $text ) {
global $logPerformance, $fh;
if ( $logPerformance ) {
fwrite( $fh, $text );
}
}
function getMicroTime() { # return time in seconds, with microsecond accuracy
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
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