/**
* @return int
*/
public function addReference()
{
$change_column_num = 0;
$table_name = $this->getTableName();
$reference_columns = $this->getDBReferenceColumn();
$results_foreignkey = $this->db->getTableForeignKey($table_name);
foreach ($reference_columns as $column) {
$key_name = $table_name . '_' . $column->getReference()->getName();
if (array_search($key_name, $results_foreignkey) !== null) {
continue;
}
if ($this->db->addForeignKey($table_name, $key_name, $column->getName(), $column->getReference()->getTableName(), $column->getReference()->getColumn(), $column->getReference()->getDelete(), $column->getReference()->getUpdate())) {
$change_column_num++;
}
}
return $change_column_num;
}
