Magento1 Interview Questions

Magento is open source Ecommerce CMS which is built in PHP. It is most popular for ecommerce website. It uses multiple other PHP frameworks such as ZEND, Laminas and Symfony.

Magento is also specially designed for online sellers who need a simple e-commerce store. It is free to all so anyone can create their own website. Magento is easy to install, easy to customize, and easy to scale, and this makes it a popular choice for all sorts of companies, from small businesses to huge multinationals.

Magento was acquired by Adobe Inc in May 2018 for $1.68 Billion USD.

All the module’s version information save into the “core_resource” table. If you want to change the version of the module then the old version replaced by a new version.

Firstly login to the magento admin panel after that click the “System/Manage Stores” tab. Now click the “Create Store” button. Now select the website, write the name of the store and now select the root category after that click the “Save Store” button.

Change theme in Magento is very simple, firstly login to Magento admin panel, after that go to the System tab, after this click the Design tab and after that click the Add Design Change button and now choose the theme what do you want.

Note:- system/design

If you want to check customer is logged in or not through code so we can use below code.
[php]
$check_login=Mage::getSingleton("customer/session")->isLoggedIn();
if(!$check_login){
echo ‘Not Logged in’;
}else{
echo ‘logged in’;
}
[/php]

[php]
$this->getLayout()->createBlock(‘cms/block’)->setBlockId(‘static block code’)->toHtml();
[/php]

Magento registry is used to share information anywhere in the Magento store. It works like a Global variable. there are 3 static methods (i) register (ii) registry (iii) unregister of the Mage class.

(i) Mage::register:- It is used to register the value in the registry.
[php]
Mage::register(‘name’, $value);
[/php]
(ii) Mage::registry:- (ii) It is used to get the value from the registry.
[php]
Mage::registry(‘name’);
[/php]

(iii) Mage::unregister:- (ii) this method is used to remove it from the registry.
[php]
Mage::unregister(‘name’);
[/php]

It is a design pattern, it is used for memory utilization. When you create an Object then It always checks Object is already created or not if already created then use this, otherwise create a new object.

Mage::getSingleton():- It always check that Object is already created or not if already created then use this, otherwise create new object. It follows the Singleton design pattern.
[php]
Mage::getSigleton(‘ModuleName/ModelName’);
[/php]

Mage::getModel():- It always create new Object. It follow Standard Factory pattern.
[php]
Mage::getModel(‘ModuleName/ModelName’);
[/php]

EAV model:- EAV(Entity Attribute Value) is a data model. When we want to add a new field in the table then we do not need to modify the table structure.

Note:- EAV structure for product in magento, product ID is stored in catalog_product_entity_int table, product name in catalog_product_entity_varchar, product price in catalog_product_entity_decimal, product created date in catalog_product_entity_datetime and product description in catalog_product_entity_text table.

Example:- If we want to add a field name is productinfo then we add into catalog_product_entity_varchar.

(i) EAV model is very useful when we want to add a field in a table structure, not need to modify the structure. In the Data model, when we add a new field then modify the table structure.

(ii) EAV model is very complex for (select, insert and update query) because we use relation from many tables. The data model is very easy to (select, insert, and update query).

(iii) EAV model is slow and the Data model is fast than the EAV model.

There are five types of product
1) Simple Product
2) Configurable Product
3) Grouped Product
4) Bundled Product
5) Virtual Product

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1) core pool
2) community pool
3) local pool

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