MySQL query to MDB query - mysql

Question

I want to convert the following MySQL to MDB query. I am not at all familiar with access and .mdb databases but I have no choice on this project. I have set up the database in .mdb and can make simple queries to it.
I am trying to convert the following query to mdb query.
SELECT name
, lat
, lng
, ( 3959 * acos( cos( radians('21.222') ) * cos( radians( lat ) )
* cos( radians( lng ) - radians('44.333') )
+ sin( radians('21.222') )
* sin( radians( lat ) ) ) ) AS distance
FROM markers
HAVING distance < '25'
ORDER BY distance ASC LIMIT 1
The query is basically querying a table markers with latitute , longitude information for each record and returns the place which is within 25 miles of the dummy place with latitude,longitude as (21.222,44.333)
Thanks,
Nikhil

Answer 1

You will need to create your own functions for those built in MySQL Mathematic functions, since access won't recognize them. Also the TOP 1 syntax is slightly different. These functions will be only available within the access application itself, so you might have to get really creative how to call this from your PHP script.
Put these math functions into a VBA code module:
Public Function acos(x As Double) As Double
'gets the inverse cosine
acos = Atn(-x / Sqr(-x * x + 1)) + 2 * Atn(1)
End Function
Public Function cos(x As Double) As Double
'gets the cosine
cos = Math.cos(x)
End Function
Public Function radians(degrees As Double) As Double
'returns a degrees measure in radians
Const PI = 3.1415926535
radians = degrees * PI / 180
End Function
Public Function sin(x As Double) As Double
'gets the sine
sin = Math.sin(x)
End Function
Your Access SQL query will look like this (Built using the query builder):
SELECT TOP 1 markers.name, markers.lat, markers.lng, (3959*acos(Cos(radians(21.222))*Cos(radians([lat]))*Cos(radians([lng])-radians(44.333))+Sin(radians(21.222))*Sin(radians([lat])))) AS distance
FROM markers
GROUP BY markers.name, markers.lat, markers.lng, (3959*acos(Cos(radians(21.222))*Cos(radians([lat]))*Cos(radians([lng])-radians(44.333))+Sin(radians(21.222))*Sin(radians([lat]))))
HAVING ((((3959*acos(Cos(radians(21.222))*Cos(radians([lat]))*Cos(radians([lng])-radians(44.333))+Sin(radians(21.222))*Sin(radians([lat])))))<25))
ORDER BY (3959*acos(Cos(radians(21.222))*Cos(radians([lat]))*Cos(radians([lng])-radians(44.333))+Sin(radians(21.222))*Sin(radians([lat]))));