/**
* Gets all primary key labels from the MySQL database.
*/
private function getLabels()
{
$tables = DataLayer::getLabelTables();
foreach ($tables as $table) {
$rows = DataLayer::getLabelsFromTable($table['table_name'], $table['id'], $table['label']);
foreach ($rows as $row) {
$this->labels[$row['label']] = $row['id'];
}
}
}
