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Let us know the exact way to import bulk data to DB using queries.

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Write custom MYSQL query without using Model

Here is example 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 to run custom queries in magento2 without using model.

$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);

For more reference Click here

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