我如何在mysql中使用函数

Question

I have designed a function in mysql to calculate distance between two coordinates.

function is like this:-

getDistance(arg1,arg2,arg3,arg4)

   {

       //calculate distance

         return distance;

}

now in my php file, i have these four argument to pass in this function.

but i dont know how can i call this function. please tell me how can call this function ?

Answer 1

虽然我发现这种结构很奇怪，并且对为什么有人会在MySQL中实现这些东西感到好奇，但它的工作方式是

mysql_query(sprintf("select getDistance(%d,%d,%d,%d)", $a, $b, $c, $d);

Answer 2

像这样select getDistance(1,2,3,4)

Answer 3

You can always use string concatenation:

<?php
mysql_query('SELECT getDistance('.$a.', '.$b.', '.$b.', '.$b.')');
?>