protected function loadPage()
 {
     $table = new PhabricatorProjectColumn();
     $conn_r = $table->establishConnection('r');
     $data = queryfx_all($conn_r, 'SELECT * FROM %T %Q %Q %Q', $table->getTableName(), $this->buildWhereClause($conn_r), $this->buildOrderClause($conn_r), $this->buildLimitClause($conn_r));
     return $table->loadAllFromArray($data);
 }
<?php

// Was PhabricatorEdgeConfig::TYPE_COLUMN_HAS_OBJECT
$type_has_object = 44;
$column = new PhabricatorProjectColumn();
$conn_w = $column->establishConnection('w');
$rows = queryfx_all($conn_w, 'SELECT src, dst FROM %T WHERE type = %d', PhabricatorEdgeConfig::TABLE_NAME_EDGE, $type_has_object);
$cols = array();
foreach ($rows as $row) {
    $cols[$row['src']][] = $row['dst'];
}
$sql = array();
foreach ($cols as $col_phid => $obj_phids) {
    echo pht("Migrating column '%s'...", $col_phid) . "\n";
    $column = id(new PhabricatorProjectColumn())->loadOneWhere('phid = %s', $col_phid);
    if (!$column) {
        echo pht("Column '%s' does not exist.", $col_phid) . "\n";
        continue;
    }
    $sequence = 0;
    foreach ($obj_phids as $obj_phid) {
        $sql[] = qsprintf($conn_w, '(%s, %s, %s, %d)', $column->getProjectPHID(), $column->getPHID(), $obj_phid, $sequence++);
    }
}
echo pht('Inserting rows...') . "\n";
foreach (PhabricatorLiskDAO::chunkSQL($sql) as $chunk) {
    queryfx($conn_w, 'INSERT INTO %T (boardPHID, columnPHID, objectPHID, sequence)
      VALUES %Q', id(new PhabricatorProjectColumnPosition())->getTableName(), $chunk);
}
echo pht('Done.') . "\n";
<?php

$table = new PhabricatorProjectColumn();
$conn_w = $table->establishConnection('w');
foreach (new LiskMigrationIterator($table) as $column) {
    $id = $column->getID();
    echo pht('Adjusting column %d...', $id) . "\n";
    if ($column->getSequence() == 0) {
        $properties = $column->getProperties();
        $properties['isDefault'] = true;
        queryfx($conn_w, 'UPDATE %T SET properties = %s WHERE id = %d', $table->getTableName(), json_encode($properties), $id);
    }
}
echo pht('Done.') . "\n";