How in insert image path in Wordpress database that will display product image in wp admin not on front end?

[admin]

<pre class="lang-php prettyprint-override">

$insert = $wpdb->insert( $prefix."posts", array("post_title" => $posTitle,"post_content" => $postContent,"post_status" => "publish","post_type" =>"product"));

// select products ID
$select = $wpdb->get_results("SELECT ID AS productsId FROM ".$prefix."posts WHERE post_title='".$posTitle."'");
//echo $select[0]->productsId; die();
// insert Image in pots and product attribute meta posts table
$insertImg = $wpdb->insert($prefix."posts",array("post_status" =>"inherit","post_type" => "attachment","guid" => $postGuid,"post_parent" => $select[0]->productsId ));

I need a small, which table and column I need to insert to display product image in wordpress admin, I insert products by query in wordpress rather than insert product by admin.