Illuminate\Database\Connection::setPdo PHP Method

    public function setPdo($pdo)
    {
        $this->transactions = 0;
        $this->pdo = $pdo;
        return $this;
    }

 /**
  * Prepare the read write mode for database connection instance.
  *
  * @param  \Illuminate\Database\Connection  $connection
  * @param  string  $type
  * @return \Illuminate\Database\Connection
  */
 protected function setPdoForType(Connection $connection, $type = null)
 {
     if ($type == 'read') {
         $connection->setPdo($connection->getReadPdo());
     } elseif ($type == 'write') {
         $connection->setReadPdo($connection->getPdo());
     }
     return $connection;
 }