How to get data from database in javascript based on the value passed to the function

Question

In my web application, I want to retrieve data from database based on the value that is passed to the function. I wrote the query as follows.

Answer 1

'SELECT * FROM Employ where number = ' + parseInt(val, 10) + ';'

For example, if val is "10" then this will end up building the string:

"SELECT * FROM Employ where number = 10;"