--- /dev/null
+<?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);
+}
dépôts / lhc / web / wiklou.git / commitdiff