20180828.phriction.04.migrate.php
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	<?php

	// Update the PhrictionDocument and PhrictionContent tables to refer to one
	// another by PHID instead of by ID.

	$document_table = new PhrictionDocument();
	$content_table = new PhrictionContent();

	$conn = $document_table->establishConnection('w');

	$document_iterator = new LiskRawMigrationIterator(
	$conn,
	$document_table->getTableName());
	foreach ($document_iterator as $row) {
	$content_id = $row['contentID'];

	$content_row = queryfx_one(
	$conn,
	'SELECT phid, dateCreated FROM %T WHERE id = %d',
	$content_table->getTableName(),
	$content_id);

	if (!$content_row) {
	continue;
	}

	queryfx(
	$conn,
	'UPDATE %T SET contentPHID = %s, editedEpoch = %d WHERE id = %d',
	$document_table->getTableName(),
	$content_row['phid'],
	$content_row['dateCreated'],
	$row['id']);
	}

	$content_iterator = new LiskRawMigrationIterator(
	$conn,
	$content_table->getTableName());
	foreach ($content_iterator as $row) {
	$document_id = $row['documentID'];

	$document_row = queryfx_one(
	$conn,
	'SELECT phid FROM %T WHERE id = %d',
	$document_table->getTableName(),
	$document_id);
	if (!$document_row) {
	continue;
	}

	queryfx(
	$conn,
	'UPDATE %T SET documentPHID = %s WHERE id = %d',
	$content_table->getTableName(),
	$document_row['phid'],
	$row['id']);
	}