/**
* Constructor of RelationTable
* @param string $name
* @param string|null $tableOf ('src', 'tgt' or null)
*/
public function __construct($name, $tableOf)
{
parent::__construct($name);
switch ($tableOf) {
case 'src':
case 'tgt':
case null:
$this->tableOf = $tableOf;
break;
default:
throw new Exception("Unknown tableOf value '{$tableOf}' specified for RelationTable {$this->name}", 500);
}
}
/**
* Generate a new atom identifier for this concept
* @return string
*/
public function createNewAtomId()
{
static $prevTime = null;
if (strpos($this->name, '_AI') !== false && $this->isInteger()) {
$firstCol = current($this->mysqlConceptTable->getCols());
$query = "SELECT MAX(`{$firstCol->name}`) as `MAX` FROM `{$this->mysqlConceptTable->name}`";
$result = array_column((array) $this->database->Exe($query), 'MAX');
if (empty($result)) {
$atomId = 1;
} else {
$atomId = $result[0] + 1;
}
} else {
$now = explode(' ', microTime());
// yields ["microseconds", "seconds"] both in seconds, e.g. ["0.85629400", "1322761879"]
$time = $now[1] . substr($now[0], 2, 6);
// we drop the leading "0." and trailing "00" from the microseconds
// Guarantee that time is increased
if ($time <= $prevTime) {
$time = ++$prevTime;
} else {
$prevTime = $time;
}
$atomId = $this->name . '_' . $time;
}
return $atomId;
}