Web Worker | Multithreading in Javascript

 1. Connect Web Worker to SQL Database. Web worker does not allow default JQUERY to be used. Alternatives:

• There's another alternative such as fake DOM JQUERY & importScripts() method (but unfortunately, this alternate method doesn't work for me - there were still some errors)
• Use fetch method:

fetch('process.php').then(res => res.text())    //convert the above data (from the url) into text

                .then(body =>{

                    self.postMessage(body);

                })

2. Print all data from SQL database:

After you have successfully connected to the PHP file (read no.1), you can continue step 2 which is to print all the data from the database by using for loop.

 // if result is not zero, display result

 if($result-> rowCount() > 0){

    for($i = 0; $i < $result->rowCount(); $i++){

        $row = $result-> fetch(PDO::FETCH_ASSOC);

        print_r(json_encode($row));

        // echo $row["user_email"] .="\n";

    }

}

*notes: print_r(json_encode($row)); actually print the data in encoded json format. You've to include it in the for loop, otherwise it will only print the first OR last data fetched.