User Error: DDL statements are not allowed in transactions Magento 2.2.6

Question

I want to achieve following functionality:

Whenever user tries to insert new data, i want to remove all old data from my custom table and insert new data.

For this, i want to use truncateTable() method. i am using code from below link:

Truncate table using resource model in Magento 2

But i am getting below error when i run code:

Something went wrong while saving this configuration: User Error: DDL statements are not allowed in transaction

Is there anyway we can truncate table using code?

Note: It works with delete but reason to use truncate is to reset my custom table's auto-increment key.

Answer 1

Right now i ended up with delete instead of truncate. Actually this is not the best solution because i want to reset my auto increment key in addition to deleting all data from my table. Still someone can use this code so i am sharing here:

Solution with delete instead of truncate is as below:

<?php
class custom
{
    protected $connection;
    protected $dbresource;

    public function __construct(\Magento\Framework\App\ResourceConnection $dbresource)
    {
        $this->connection = $dbresource->getConnection();
        $this->dbresource = $dbresource; 
    }

    public function mycustomfunction()
    {
        $table = $this->dbresource->getTableName("my_custom_table");
        $this->connection->delete(
                $table,
                ['1 = 1']
        );
    }
}
?>

I am still looking for a way to use truncate!!

Answer 2

To remove old data from database, you can use magento code as well.

<?php
use Vendor\Extension\Model\ResourceModel\CollectionFactory;

class Yourclass
{
    protected $_collectionFactory;

    public function __construct(.....
    CollectionFactory $collectionFactory
    .....)
    {
        $this->_collectionFactory = $collectionFactory;
    }

    public function execute()
    {
       // To remove all old data.

       $mycollection = $this->_collectionFactory->create()
                     ->getCollection();
       foreach ($mycollection as $myitem) {
            $myitem->delete();
        }

        // Now you can do code here to add new data
    }

}