WordPress ACF Google Maps Radius Search - mysql

Question

i got a big Problem and have no Solution.
i work with WordPress and Custom-Post-Type (CPT) and Advanced Custom Fields (ACF).
I create a new CPT called "projekt" and a ACF "Google Map Field" which saves the Adress, longtitude and latitude. The bad thing is ACF Fields were saved serialzed in the MySQL DB.
i found the following SQL-Query on the Net to calculate the Radius.
$lat = '50.12335';
$lng = '-1.344453';
$radius = 10; // (km)
???....WHERE ( 6371 * acos( cos( radians(" . $lat . ") )
* cos( radians( lat ) )
* cos( radians( lng )
- radians(" . $lng . ") )
+ sin( radians(" . $lat . ") )
* sin( radians( lat ) ) ) ) <= " . $radius . ")"
i don't know how to build the query, because the query needs to get the longtitude and latitude info from the serialized ACF fields.
DB-Field "meta_value":
a:13:{s:7:"address";s:44:"Moskauer Straße 5, Düsseldorf, Deutschland";s:3:"lat";d:51.2199565;s:3:"lng";d:6.8044928;s:4:"zoom";i:14;s:8:"place_id";s:114:"EiNNb3NrYXVlciBTdHIuLCBEw7xzc2VsZG9yZiwgR2VybWFueSIuKiwKFAoSCZV-jR3Ny7hHEVVgUQUBF7q8EhQKEgkBGQXwtsu4RxHgwS1K_GAnBQ";s:4:"name";s:16:"Moskauer Straße";s:11:"street_name";s:16:"Moskauer Straße";s:17:"street_name_short";s:13:"Moskauer Str.";s:4:"city";s:11:"Düsseldorf";s:5:"state";s:19:"Nordrhein-Westfalen";s:11:"state_short";s:3:"NRW";s:7:"country";s:11:"Deutschland";s:13:"country_short";s:2:"DE";}
i can get all my "projekt"'s with:
maybe it's possible to extend the following query
SELECT P.ID, P.post_title, P.post_content, P.post_author, meta_value
FROM wp_posts AS P
LEFT JOIN wp_postmeta AS PM on PM.post_id = P.ID
WHERE P.post_type = 'projekt' and P.post_status = 'publish' and ( meta_key = 'adress' )
ORDER BY P.post_date DESC
result is:
ID|post_title |post_content|post_author|meta_value
55|Test Projekt| |1 |a:13:{s:7:"address";s:44:"Moskauer Straße 5, Düss...
Do you got any Solution for me ?
Thank You!

Answer 1

OK, so this looks pretty nasty but in testing with out adding the radius portion Im able to extract the lat and lng from the serialized data.
So I think you can tack on your radius check as an AND something like below:
SELECT
REPLACE(SUBSTRING_INDEX(SUBSTRING_INDEX(SUBSTRING_INDEX(pm.meta_value, 'lat', -1), ';', 2), ':', -1), '"', '') AS latitude,
REPLACE(SUBSTRING_INDEX(SUBSTRING_INDEX(SUBSTRING_INDEX(pm.meta_value, 'lng', -1), ';', 2), ':', -1), '"', '') AS longitude
FROM wp_postmeta pm
WHERE pm.meta_key = 'change_to_your_meta_key'
AND ( 6371 * acos( cos( radians(" . $lat . ") )
* cos( radians( latitude ) )
* cos( radians( longitude )
- radians(" . $lng . ") )
+ sin( radians(" . $lat . ") )
* sin( radians( longitude ) ) ) ) <= " . $radius . ")"

Answer 2

i found the solution by myself.
Most People, create extra Tables with lat and long.
I think that's senseless because they are already there in the acf field.
i'm not very skilled in MySQL so some people can shorten the query of course.
i dont know how to use varibales in MySQL so the regex for lat and long can be put into a Variable:
REGEXP_REPLACE(IF(PM.meta_key = 'adress', PM.meta_value, NULL), '.+\"lat\";d:([0-9\.]+).+','\\1') AS latitude
REGEXP_REPLACE(IF(PM.meta_key = 'adress', PM.meta_value, NULL), '.+\"lng\";d:([0-9\.]+).+','\\1') AS longitude
here is now the complete query for Radius Search with WordPress , ACF (Google Map field), where INPUTLAT,INPUTLONG,INPUTKM are the values you deliver:
SELECT P.ID, P.post_title, P.post_content, P.post_author,
IF(PM.meta_key = 'adress', PM.meta_value, NULL) AS adress,
REGEXP_REPLACE(IF(PM.meta_key = 'adress', PM.meta_value, NULL), '.+\"lat\";d:([0-9\.]+).+','\\1') AS latitude,
REGEXP_REPLACE(IF(PM.meta_key = 'adress', PM.meta_value, NULL), '.+\"lng\";d:([0-9\.]+).+','\\1') AS longitude
FROM wp_posts AS P
LEFT JOIN wp_postmeta AS PM on PM.post_id = P.ID
WHERE P.post_type = 'projekt' and P.post_status = 'publish' and IF(PM.meta_key = 'adress', PM.meta_value, NULL) IS NOT NULL and IF(PM.meta_key = 'adress', PM.meta_value, NULL) IS NOT NULL AND
( 6371 * acos( cos( radians(INPUTLAT) )
* cos( radians( REGEXP_REPLACE(IF(PM.meta_key = 'adress', PM.meta_value, NULL), '.+\"lat\";d:([0-9\.]+).+','\\1') ) )
* cos( radians( REGEXP_REPLACE(IF(PM.meta_key = 'adress', PM.meta_value, NULL), '.+\"lng\";d:([0-9\.]+).+','\\1') )
- radians(INPUTLONG) )
+ sin( radians(INPUTLAT) )
* sin( radians( REGEXP_REPLACE(IF(PM.meta_key = 'adress', PM.meta_value, NULL), '.+\"lat\";d:([0-9\.]+).+','\\1') ) ) ) ) <= INPUTKM
ORDER BY P.post_date DESC
This Just work at MariaDB or MySQL 8. MySQL 5 dont know REGEX_REPLACE