/**
* get the foreign key object from a db result array
*
* @param string[] dbresult array
* @return rdbms.DBForeignKeyConstraint
*/
private function parseForeignKey($db_constraint)
{
$cstring = $db_constraint['definition'];
$bracestrings = $this->subBracerString($cstring);
$strings = explode(' ', $cstring);
$attributes = [];
foreach ($bracestrings as $bracestring) {
$attributes[] = $this->extractParams($bracestring);
}
$constraint = new \rdbms\DBForeignKeyConstraint();
$constraint->setSource($strings[5]);
$constraint->setName($db_constraint['name']);
$constraint->setKeys(array_combine($attributes[0], $attributes[1]));
return $constraint;
}
/**
* get the foreign key object from a string
*
* @param string parsestring
* @return rdbms.DBForeignKeyConstraint
*/
private function parseForeignKeyString($string)
{
$constraint = new \rdbms\DBForeignKeyConstraint();
$quotstrings = [];
$bracestrings = [];
$attributes = [];
$pos = 10;
while (++$pos < strlen($string)) {
switch ($string[$pos]) {
case '`':
$quotstrings[] = $this->parseQuoteString($string, $pos, '`');
break;
case '"':
$quotstrings[] = $this->parseQuoteString($string, $pos, '"');
break;
case '(':
$bracestrings[] = $this->parseBracerString($string, $pos);
break;
}
}
foreach ($bracestrings as $bracestring) {
$params = $this->extractParams($bracestring);
foreach ($params as $i => $param) {
$params[$i] = substr($param, 1, -1);
}
$attributes[] = $params;
}
$constraint->setKeys(array_combine($attributes[0], $attributes[1]));
$constraint->setName($quotstrings[0]);
$constraint->setSource($quotstrings[1]);
return $constraint;
}