Once we run the program, the HTTP server will start locally listening on port 8080. 

Next, executing a PUT request from the command line to update an employee record with the ID as 1 will give you the number of records updated in the database as a response:

$ curl -X PUT http://localhost:8080/employee/update/1?name=bar
Number of rows updated in database are :: 1

Let’s look at the program we have written:

1. We defined an updateRecord handler, which gets the ID to be updated in the database as a URL path variable path, and the new name as the request variable, prepares an update statement with a name and UID as a placeholder, which will be replaced dynamically, executes the statement, gets the number of rows updated as a result of its execution, and writes it to an HTTP response stream.
2. Next, we registered an updateRecord handler to be called for the URL pattern /employee/update/{id} for every PUT request with the gorilla/mux router and closed the database using the defer db.Close() statement once we return from the main() function.