Magento2 – Write Custom Mysql Query (Without Using Model)

Here we learn how to write custom mysql query in Magento2.

Suppose we have table ’employee’ with fields emp_id, emp_name, emp_code and emp_salary.

Now use following code snippet to run custom queries in magento2 without using model.

Custom Mysql Query

			$objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // Instance of object manager
			$resource = $objectManager->get('Magento\Framework\App\ResourceConnection');
			$connection = $resource->getConnection();
			$tableName = $resource->getTableName('employee'); //gives table name with prefix

			//Select Data from table
			$sql = "Select * FROM " . $tableName;
			$result = $connection->fetchAll($sql); // gives associated array, table fields as key in array.

			//Delete Data from table
			$sql = "Delete FROM " . $tableName." Where emp_id = 10";
			$connection->query($sql);

			//Insert Data into table
			$sql = "Insert Into " . $tableName . " (emp_id, emp_name, emp_code, emp_salary) Values ('','XYZ','ABD20','50000')";
			$connection->query($sql);

			//Update Data into table
			$sql = "Update " . $tableName . " Set emp_salary = 20000 where emp_id = 12";
			$connection->query($sql);