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20131106.diffphid.2.mig.php
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			<?php

			$diff_table = new DifferentialDiff();
			$conn_w = $diff_table->establishConnection('w');

			$size = 1000;

			$row_iter = id(new LiskMigrationIterator($diff_table))->setPageSize($size);
			$chunk_iter = new PhutilChunkedIterator($row_iter, $size);

			foreach ($chunk_iter as $chunk) {
			$sql = array();

			foreach ($chunk as $diff) {
			$id = $diff->getID();
			echo pht('Migrating diff ID %d...', $id)."\n";

			$phid = $diff->getPHID();
			if (strlen($phid)) {
			continue;
			}

			$type_diff = DifferentialDiffPHIDType::TYPECONST;
			$new_phid = PhabricatorPHID::generateNewPHID($type_diff);

			$sql[] = qsprintf(
			$conn_w,
			'(%d, %s)',
			$id,
			$new_phid);
			}

			if (!$sql) {
			continue;
			}

			foreach (PhabricatorLiskDAO::chunkSQL($sql) as $sql_chunk) {
			queryfx(
			$conn_w,
			'INSERT IGNORE INTO %T (id, phid) VALUES %LQ
			ON DUPLICATE KEY UPDATE phid = VALUES(phid)',
			$diff_table->getTableName(),
			$sql_chunk);
			}
			}

			echo pht('Done.')."\n";