在MySQL中创建Haversine公式

Question

Is it possible to incorporate the haversine formula into a mysql database so that I can call the function from a PHP script.

For example, in PHP I will call: Select * from postcodes where code = "CW84AD", Select * from postcodes where code = "CH73TD".

Could I call something like "Select haversine(CW84AD, CH73TD)"?

Answer 1

You can't create function because function returns only one rows.

If you want to return more than one row you can create procedure.

DELIMITER //

CREATE PROCEDURE haversine(IN arg1 VARCHAR(255), IN arg2 VARCHAR(255))

BEGIN
        Select * from postcodes where code = arg1 or code= arg2;

 END //
DELIMITER ;

Then You can call this procedure.

CALL haversine('CW84AD','CH73TD');