alphanumeric auto increment id using angularjs php and mysql

Question

interface

I have an interface implemented using angularjs, php and database is mysql and there I have a field call hop reference Ex:- 7G/0001 the 1st part is the frequency and a slash and the frequency should be the selected one from the combo box and the other part should be auto increment in the database for an example the next one could be 8G/0002. How do I implement this using angularjs, php and mysql.

Thanks

Answer 1

One way to do this is to store two different fields: frequency and id. Then in your queries, concatenate the values together. By using the auto increment field, you avoid any possibility of duplicate values or concurrency issues.

Example

CREATE TABLE ees.foo (
   frequency VARCHAR(2) NOT NULL,
   id INT AUTO_INCREMENT NOT NULL
);

Sql query

SELECT concat(frequency,'/',lpad(id, 4, '0')
  FROM tbl