src/Connection.php
public function execute(Expression $expr)
    {
        // If custom connection is set, execute again using that
        if ($this->connection && $this->connection !== $this) {
            return $expr->execute($this->connection);
        }

        throw new Exception('Queries cannot be executed through this connection');
    }
public function execute(Expression $expr)
    {
        // If custom connection is set, execute again using that
        if ($this->connection && $this->connection !== $this) {
            return $expr->execute($this->connection);
        }

        throw new Exception('Queries cannot be executed through this connection');
    }
Execute Expression by using this connection.

@param Expression $expr

@return \PDOStatement