How can I connect my wix page to mySql db?

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I want to connect my wix webpage to an mySql database.

I just want to send one string from wix to my database.
The string is generated in js:

import wixData from 'wix-data';

wixData.query("Blog/Posts")
  .find()
  .then( (results) => {
 let itemOne = results.items[0];
 let itemTwo = results.items[1];

 let blogOne = itemOne.title + ", " + itemOne.postPageUrl;
 let blogTwo = itemTwo.title + ", " + itemTwo.postPageUrl;

 let lastResult = [blogOne,blogTwo]; //export this string to my db

    })
  .catch( (err) => {
 let errorMsg = err;
  });

but the problem is, I have no idea how I can connect to mysql. There is an option to connect to an external db collection, but they ask for an endpoint url, which I never heard of while using mysql…

Can somebody please tell me how to get mysql to my data collections?