Skip to main content

What startSetup() and endSetup() methods actually does?

The startSetup() and endSetup() methods are used in setup scripts. They are often at the beginning and the end of an upgrade/install method, like in “upgrade()” method of Magento/Catalog/Setup/UpgradeData.php

The question is “do you really need them?” Or does it just “look necessary”? This blog post explores what these functions do and then explains when you do and do not need to use these methods.

Let’s see what these methods are doing.

First, startSetup():

public function startSetup() { 

 $this->rawQuery("SET SQL_MODE=''"); 

$this->rawQuery("SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0"); 

 $this->rawQuery("SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO'"); 

 return $this; 

}

1. Disable foreign keys check. It may be necessary in some rare cases (for example, in a case of cyclic references between tables), but it’s not needed in common situations. It even may lead to hiding real problems with the upgrade script, like if inserted values really break the integrity of the database.

2. Disable generation of auto-increment values when ‘0’ is inserted. It may also be useful in some cases, such as when you are certain that you’re going to insert ‘0’ values and you want them to be treated as ‘0’s, instead of defaulting to auto-incrementing. This type of scenario is not necessary for common install/upgrade scripts.

Then, endSetup() just rolls back both foreign keys check and auto-increment behavior to the previous state:

 public function endSetup() { 

    $this->rawQuery("SET SQL_MODE=IFNULL(@OLD_SQL_MODE,'')"); 

     $this->rawQuery("SET FOREIGN_KEY_CHECKS=IF(@OLD_FOREIGN_KEY_CHECKS=0, 0,     1)"); 

  return $this; 

 }

 Do you really need this for every install/upgrade? Probably not. Use startSetup() and endSetup() selectively, only for the cases where you really have some data or schema changes that are impossible without modifying default MySQL behavior.

I would recommend using these methods only when you really need such functionality during your upgrade. It would keep the foreign keys validation in place, as it may help discover potential data corruption issues.

conclusion:

==============

1:By default, don’t use startSetup() and endSetup() combination in your setup scripts. Most likely, you don’t need them.

2:The startSetup() and endSetup() may be helpful and you should use them if you want to:

   1:disable foreign key checks, or

   2:disable auto-increment for ‘0’ values. 

Labels:

Comments

Post a Comment

Popular posts from this blog

Magento 2 product collection Filtering multi-select attribute values

  If you have multi-select attribute of product like below If you want filter value for this option Use below syntax to get product data: ->addAttributeToFilter('store_model', array('finset' => $params['store_model'])) finset key is used for multiselect attribute filter. $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); $products = $objectManager->get('Magento\Catalog\Model\Product')         ->getCollection()         ->addAttributeToSelect('*')         ->addAttributeToSelect('store_brand')         ->addAttributeToSelect('store_model')         ->addAttributeToSelect('store_year')         ->addAttributeToFilter('store_brand', array('finset' => $params['store_brand']))         ->addAttributeToFilter('store_model', array('finset' => $params['store_model']))         ->addAttributeToFilter('store_year', array('
6 comments
Read more

Integrity constraint violation: 1052 Column 'created_at' in where clause is ambiguous

When trying to filter sales order grid with From and To dates it was redirecting to dashboard.after that again i tried to open sales order grind it is generating reports in reports file it showing. "Integrity constraint violation: 1052 Column 'created_at' in where clause is ambiguous" means it is finding a another created_at field. because when we adding or joining the other table then it has also a field named as created_at. So below is the  solution for this error. magento that created_at is of the main_table not of my custom table. Find the below code in the sales order grid.php file. $this->addColumn('created_at', array(            'header' => Mage::helper('sales')->__('Purchased On'),             'index' => 'created_at',             'type' => 'datetime',             'width' => '100px',         )); just replace the code with below one.  $this
Post a Comment
Read more

How to Add Magento 2 Sort by Price for Low to High & High to Low Options and name A-Z & Z-A etc sort dropdown

The store design and its navigation must be in such a way that makes it easier for the shopper to find the exact required product and make the shopping process comfortable and enjoyable.  Navigation can be made easier and hence improve the shopping experience by offering custom sorting options. The default Magento 2 offers sorting by position, product name, and price  A price-sensitive customer may save some clicks by starting with the cheapest products. On the other hand, customers who have a high standard for quality may quickly find their most desired products by sampling from high prices to low prices. To provide such feature in Magento 2 and serve both the type of price-sensitive customers, you can add Magento 2 sort by price for low to high & high to low options. Some people can sort by names A-Z or Z-A, position low to high high to low like this we can improve sales to our site and user can easily find products for implementing this fallow given steps to implement sorting Ad
Post a Comment
Read more