Magento 2 : Create Review & Rating programmatically from other db or csv?

This code is for import reviews from the other database table into magento2 product review.
Step1- Please empty review and rating tables.

Magento 2 Database table list.

1. review
2. review_detail
3. review_entity_summary
4. review_store
5. rating_option_vote
6. rating_option_vote_aggregated

Step2- Create 2 tables in your magento database test_customer and test_reviews.
CREATE TABLE `test_customer` (
  `customerid` int(11) NOT NULL,
  `firstname` varchar(255) NOT NULL,
  `lastname` varchar(255) NOT NULL,
  `emailaddress` varchar(255) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1;



CREATE TABLE `test_reviews` (
  `id` int(11) NOT NULL,
  `lastmodified` varchar(255) NOT NULL,
  `productcode` varchar(255) NOT NULL,
  `reviewtitle` varchar(255) NOT NULL,
  `rate` varchar(255) NOT NULL,
  `customerid` varchar(255) NOT NULL,
  `name` varchar(255) NOT NULL,
  `location` varchar(255) NOT NULL,
  `active` varchar(255) NOT NULL,
  `reviewdescription` text NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1;



Here you can insert the data from your csv's or other database

Step3- create a php page and paste the below code.

<?php
error_reporting(E_ALL);
set_time_limit(0);
ini_set('display_errors', '1');
ini_set('max_execution_time', 0);
ini_set('memory_limit', '3072M');
ini_set('auto_detect_line_endings', TRUE);

use Magento\Framework\App\Bootstrap;
require __DIR__ . '/app/bootstrap.php';
$bootstrap = Bootstrap::create(BP, $_SERVER);
$obj = $bootstrap->getObjectManager();
$state = $obj->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');

$objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // Instance of object manager
$resource = $objectManager->get('Magento\Framework\App\ResourceConnection');
$connection = $resource->getConnection();


//Get Customer email for oldsite
function get_customer_email($id)
{
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // Instance of object manager
    $resource = $objectManager->get('Magento\Framework\App\ResourceConnection');
    $connection = $resource->getConnection();
    $sql = "Select * FROM test_customer_au where customerid=".$id;
    $result = $connection->fetchAll($sql);
   if(count($result)>0){
    $email= $result[0]['emailaddress'];
   }
   else{$email= 'abc@testwebsite.com';}
 
    return $email;
}

// start code where old site review
/*
 * Select * FROM test_reviews where 1
 * I got all the reivew by this query.
 *
 *
 * */

$sql = "Select * FROM test_reviews where 1 ";
$result = $connection->fetchAll($sql);


foreach($result as $kk){
 
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // Instance of object manager
    $customerId = '1234'; // default userid in my case when user is not avalable other wise blank
    $nickname= $kk['name'].', '.$kk['location'];
    $timestamp = '';
    $new_date_format = '';
    $timestamp = strtotime($kk['lastmodified']);
    $new_date_format = date('Y-m-d H:i:s', $timestamp);
 
   // Load product data
    $sku =$kk['productcode'];  
    $productObject = $objectManager->get('Magento\Catalog\Model\Product');
    $product = $productObject->loadByAttribute('sku', $sku);
    $productId = $product->getId();
 
    // Load customer data
    /*
*  I load email id from here by the mapping of ID from the magento2 and custom table using function
* get_customer_email()
*
* */
    if($kk['customerid']!=""){
        $email = get_customer_email($kk['customerid']);
        $customerObj = $objectManager->create('Magento\Customer\Model\ResourceModel\Customer\Collection');
        $collection = $customerObj->addAttributeToSelect('*')
        ->addAttributeToFilter('email',$email)
        ->load();
 
       $cdata=$collection->getData();
       if(isset($cdata[0]['entity_id']) && $cdata[0]['entity_id']!=''){$customerId = $cdata[0]['entity_id'];}else{$customerId = '4611';}
 
    }
 
  // Save Reviews
$bootstrap = Bootstrap::create(BP, $_SERVER);
$obj = $bootstrap->getObjectManager();
$state = $obj->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');

     if($kk['active']=="Y"){
$_review = $objectManager->get("Magento\Review\Model\Review")
        ->setEntityPkValue($productId)//product Id
        ->setStatusId(\Magento\Review\Model\Review::STATUS_APPROVED)// approved /PENDING
        ->setTitle($kk['reviewtitle'])
        ->setDetail($kk['reviewdescription'])
        ->setEntityId(1)
        ->setStoreId(2)
        ->setStores(2)
        ->setCustomerId($customerId)//get dynamically here
        ->setNickname($nickname)
        ->save();
    }
    if($kk['active']=="N"){
$_review = $objectManager->get("Magento\Review\Model\Review")
        ->setEntityPkValue($productId)//product Id
        ->setStatusId(\Magento\Review\Model\Review::STATUS_PENDING)// approved /PENDING
        ->setTitle($kk['reviewtitle'])
        ->setDetail($kk['reviewdescription'])
        ->setEntityId(1)
        ->setStoreId(2)
        ->setStores(2)
        ->setCustomerId($customerId)//get dynamically here
        ->setNickname($nickname)
        ->save();
    }
 
   // echo "Review Has been saved ";
 
    /*
    $_ratingOptions = array(
        1 => array(1 => 1,  2 => 2,  3 => 3,  4 => 4,  5 => 5), //quality
        2 => array(1 => 6,  2 => 7,  3 => 8,  4 => 9,  5 => 10),//value
        3 => array(1 => 11, 2 => 12, 3 => 13, 4 => 14, 5 => 15),//price
        4 => array(1 => 16, 2 => 17, 3 => 18, 4 => 19, 5 => 20) //rating
    );
    */
 
    //just Assume user selected rating options
    $ratingOptions ='';
    if($kk['rate'] == "1")
    {
        $ratingOptions = array(
           // '1' => '1',
           // '2' => '7',
           // '3' => '13',
            '4' => '16',
        );
    }
    if($kk['rate'] == "2")
    {
        $ratingOptions = array(
           // '1' => '1',
           // '2' => '7',
           // '3' => '13',
            '4' => '17',
        );
    }
    if($kk['rate'] == "3")
    {
        $ratingOptions = array(
           // '1' => '1',
           // '2' => '7',
           // '3' => '13',
            '4' => '18',
        );
    }
    if($kk['rate'] == "4")
    {
        $ratingOptions = array(
           // '1' => '1',
           // '2' => '7',
           // '3' => '13',
            '4' => '19',
        );
    }
    if($kk['rate'] == "5")
    {
        $ratingOptions = array(
           // '1' => '1',
           // '2' => '7',
           // '3' => '13',
            '4' => '20',
        );
    }
 
    foreach ($ratingOptions as $ratingId => $optionIds) {
        $objectManager->get("Magento\Review\Model\Rating")
            ->setRatingId($ratingId)
            ->setReviewId($_review->getId())
            ->addOptionVote($optionIds, $productId);
    }
 
    // generates summary
            $_review->aggregate();
            // if you want to save review in previous dates
            $_review->setCreatedAt($new_date_format);
            $_review->save();
         

echo "<br/>Rating has been saved success !!!!!!!!!= ".$_review->getId();

}


?>