This result is a forward only result set, calling rewind() after moving forward is not supported - Zend

Question

In Zend app, I use Zend\\Db\\TableGateway and Zend\\Db\\Sql to retrieve data data from MySQL database as below.

Model -

pu         


        

Answer 1

You receive this Exception because this is expected behavior. Zend uses PDO to obtain its Zend\Db\ResultSet\Resultset which is returned by Zend\Db\TableGateway\TableGateway. PDO result sets use a forward-only cursor by default, meaning you can only loop through the set once.

For more information about cursors check Wikipedia and this article.

As the Zend\Db\ResultSet\Resultset implements the PHP Iterator you can extract an array of the set using the Zend\Db\ResultSet\Resultset:toArray() method or using the iterator_to_array() function. Do be careful though about using this function on potentially large datasets! One of the best things about cursors is precisely that they avoid bringing in everything in one go, in case the data set is too large, so there are times when you won't want to put it all into an array at once.