我可以在ajax代码中编写SQL更新吗？

I have been working on an ajax code in which I need to update a SQL table. I am not sure if I could write SQL code inside ajax or not as I am completely new to AJAX. While I was trying, I was having issue i.e when I write code for SQL update inside the ajax code, it gives me an error saying "Uncaught Syntax Error: Missing catch or finally after try". Here is the code that I am working on:I have been working on an ajax code in which I