larval 如何捕获mysql错误

public function render($request, Exception $e)
{
 switch ($e) {
 case ($e instanceof \Illuminate\Database\QueryException):
 LogTracker::saveSqlError($e);
 break;
 default:
 LogTracker::saveError($e, $e->getCode());
 }
 return parent::render($request, $e);
}

public function saveSqlError($exception)
{
 $sql = $exception->getSql();
 $bindings = $exception->getBindings()
 // Process the query's SQL and parameters and create the exact query
 foreach ($bindings as $i => $binding) {
 if ($binding instanceof \DateTime) {
 $bindings[$i] = $binding->format('\'Y-m-d H:i:s\'');
 } else {
 if (is_string($binding)) {
 $bindings[$i] = "'$binding'";
 }
 }
 }
 $query = str_replace(array('%', '?'), array('%%', '%s'), $sql);
 $query = vsprintf($query, $bindings);
 // Here's the part you need
 $errorInfo = $exception->errorInfo;
 $data = [
 'sql' => $query,
 'message' => isset($errorInfo[2]) ? $errorInfo[2] : '',
 'sql_state' => $errorInfo[0],
 'error_code' => $errorInfo[1]
 ];
 // Now store the error into database, if you want..
 // ....
}