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magento2 array from DB

magento2 array from DB

I have a small problem

I should retrieve the data from the sales_order_item table and then print it to a my view page page

My problem is that I can not retrieve the data


The function is:

Public function getProductName () {
Return $ this -> _ order-> getName ();

Where Name is the record of the table I'm analyzing. I have to retrieve them by giving the Order ID that I have already retrieved with:

Public function getOrderIncrementId () {
Return $ this -> _ order-> getIncrementId ();


The problem is that when I get the get I can not transform it into an array then explode it with a foreach in the my view page

I always return an empty sample as if there were no data inside