magento Integrity Constraint Violation during product creation/update

Question

I'm currently trying to integrate magento into an ERP System using an self written middleware. I get this message:

Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`magento`.`catalog_product_entity`, CONSTRAINT     `FK_CAT_PRD_ENTT_ATTR_SET_ID_EAV_ATTR_SET_ATTR_SET_ID` FOREIGN KEY (`attribute_set_id`) REFERENCES `eav_attribute_set` (`a)

I don't really know where the problem lies. The result Object of a Product get and Product write look similar. I checked the web already for help, but couldn't find an solution for it. I also don't really know where to search, because the message on top is the only one I get.

Any help is appreceated.

---

Well the code itself is split up into multiple sections

but I'll try to show as much as possible

 $this->product = Mage::getModel('catalog/product')->loadByAttribute('sku',$this->handler['art_nr']);
        if($this->product===false || $this->product->getId()<1){
            $this->product = Mage::getModel('catalog/product');
            $this->product->setSku($this->handler['art_nr']);
            $this->newProduct = true;
        }
        $this->product->setStatus($this->shoparticle['products_status']);
        $this->product->setName($this->handler['art_name']);
        $categories = array();
        if(!$this->isNewProduct()){
            $categories = $this->product->getCategoryIds();
        }
        $categories = $this->handler['all_categories'];
        $this->product->setCategoryIds($categories);
        $crosssellingSet    = array();
        $upsellingSet       = array();
        $relatedSet         = array();
        if(is_array($this->handler['xselling']) && count($this->handler['xselling'])>0){
            foreach($this->handler['xselling'] as $valueSet){
                $product = Mage::getModel('catalog/product')->loadBySku($valueSet['art_nr']);
                if((int)$valueSet['group']===1){
                    $crossselling[$product->getId()] = array('position'=>$valueSet['sort_oder']);
                }else if((int)$valueSet['group']===2){
                    $upsellingSet[$product->getId()] = array('position'=>$valueSet['sort_oder']);
                }else if((int)$valueSet['group']===3){
                    $relatedSet[$product->getId()] = array('position'=>$valueSet['sort_oder']);
                }
            }
        }
        $this->product->setCrossSellProductsData($crosssellingSet);
        $this->product->setUpsellingProductsData($upsellingSet);
        $this->product->setRelatedProductsData($relatedSet);
        $importDir = Mage::getBaseDir('media') . DS . 'import' . DS;
        //check if exists and add .htaccess file for protection
        if(!is_dir($importDir)){
            @mkdir($importDir,0775,true);
            @chmod($importDir,0775);
        }
        if(!is_dir($importDir)){
            throw new Connector_Model_Exception_Error('Could not create import Directory!');
        }
        if(!file_exists($importDir.'.htaccess')){
            file_put_contents($importDir.'.htaccess','Order deny,allow'."\n".'Deny from all'."\n");
        }
        //clean direcotry
        $dir = dir($importDir);
        while(($e=$dir->read())!==false){
            if(strpos($e,'.jpg')||strpos($e,'.png')||strpos($e,'.jepg')||strpos($e,'.gif')||strpos($e,'.tif')){
                @unlink($importDir.$e);
            }
        }
        //write images into directory
        //and run Import
        foreach($this->handler['images'] as $image){
            file_put_contents($importDir.$image['image_name'],$image['image']);
            $this->product->addImageToMediaGallery($importDir.$image['image_name'], array('image', 'small_image', 'thumbnail'), false, false);
        }
        $groups = Mage::getModel('customer/group')->getCollection()->getAllIds();
        if((float)$this->handler['Bpreis'] > 0.00){
            $this->product->setPrice((float)$this->handler['Bpreis']);
        }
        if((float)$this->handler['art']['products_pprices'] > 0.00){
            $this->product->setMsrp((float)$this->handler['art']['products_pprices']);
        }
        //preapre the price data for ranges
        $groupsets = array();
        if(count($this->handler['PGROUP'])){
            foreach($this->handler['PGROUP'] as $group){
                if(in_array(((int)$group['gruppe']-250),$groups)){
                    $groupsets[((int)$group['gruppe']-250)][(float)$group['marge']] = (float)$group['PGPRICE'];
                }
            }
        }
        //Now run ageanst groupsets to set price range etc
        $storeid = Mage::app()->getStore()->getWebsiteId();
        foreach($groupsets as $groupid=>$rangeset){
            if(count($rangeset)>0){
                foreach($rangeset as $key=>$value){
                    if(count($rangeset)===1 && $key === (float)0){
                        $this->product->setData(
                            'group_price',
                            array(
                                'website_id'=>$storeid,
                                'cust_group'=>$groupid,
                                'price'=>$value,
                            )
                        );
                    }else{
                        $this->product->setData(
                            'tier_price',array(
                                'website_id'=>$storeid,
                                'cust_group'=>$groupid,
                                'price'=>$value,
                                'price_qty'=>$key
                            )
                        );
                    }
                }
            }
        }
        Mage::app()->getStore()->setId(Mage_Core_Model_App::ADMIN_STORE_ID);
        if($this->isNewProduct()){
            $this->product->setCreatedAt(strtotime('now'));
        }
        $this->product->save();

Answer 1

The error is telling you exactly what the problem is. You are trying to save a product with an incorrect attribute set id. By that it means that the attribute set id you have set or not set in this case is not in the eav_attribute_set table. I think it's because if you create a new product you are not setting it. If you are updating an existing one you dont need to set it.

if($this->product===false || $this->product->getId()<1){
    $this->product = Mage::getModel('catalog/product');
    $this->product->setSku($this->handler['art_nr']);
    // Set Attribute Set. Should be numeric for simple, bundle, configurable, grouped etc
    $this->product->setAttributeSetId($this->handler['art_attribute_set_id']); 
    $this->newProduct = true;
}

Answer 2

Please check are you using right Attribute set id with your code. Please share the code where you have written the code to update/save the product.