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What is the PHP variable or object to connect to database


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Hi, I'm trying to build a personal module to manage returns and I want to make a HTML select with the orders and their customers.


I need to know what is the variable or object to connect with the database because I do a SQL query in my PHP script, but I don't know how to do the connection to database.

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i forgot to mention about little modification for INSERT / UPDATE / DELETE queries:


in these cases you have to use execute function instead the executeS



Db::getInstance()->execute('INSERT INTO `'._DB_PREFIX_.'something` (row) VALUES (value)');

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