Komentáře k příspěvku: Hledání vzdálenosti GPS souřadnic v MySQL a PHP http://www.havlena.net/blog/hledani-vzdalenosti-gps-souradnic-v-mysql-a-php/ ... o všem a všelijak Tue, 17 Jan 2012 09:50:22 +0100 http://wordpress.org/?v=2.8.6 hourly 1 Od: Matouš Havlena http://www.havlena.net/blog/hledani-vzdalenosti-gps-souradnic-v-mysql-a-php/comment-page-1/#comment-380 Matouš Havlena Sat, 08 Jan 2011 20:24:17 +0000 http://www.havlena.net/blog/?p=860#comment-380 Jelikoz "building_longitude BETWEEN lon1 AND lon2 AND building_latitude BETWEEN lat1 AND lat2" je zde pouze pro zrychleni dotazu (jinak by mohl trvat v radech sekund), Mimojine tento vyraz "ohranicuje" maximalni prohledavanou oblast na ctverec, ale my pozadujeme kruh (ktereho dosahneme pomoci "HAVING distance < mydistance"). Cely dotaz by bez "building_longitude BETWEEN lon1 AND lon2 AND building_latitude BETWEEN lat1 AND lat2" stale fungoval, akorat mnohem pomaleji. Presnejsi vysvetleni i s obrazky najdes tady: http://www.scribd.com/doc/2569355/Geo-Distance-Search-with-MySQL Jelikoz „building_longitude BETWEEN lon1 AND lon2 AND building_latitude BETWEEN lat1 AND lat2″ je zde pouze pro zrychleni dotazu (jinak by mohl trvat v radech sekund), Mimojine tento vyraz „ohranicuje“ maximalni prohledavanou oblast na ctverec, ale my pozadujeme kruh (ktereho dosahneme pomoci „HAVING distance < mydistance").

Cely dotaz by bez "building_longitude BETWEEN lon1 AND lon2 AND building_latitude BETWEEN lat1 AND lat2" stale fungoval, akorat mnohem pomaleji. Presnejsi vysvetleni i s obrazky najdes tady: http://www.scribd.com/doc/2569355/Geo-Distance-Search-with-MySQL

]]> Od: Tom http://www.havlena.net/blog/hledani-vzdalenosti-gps-souradnic-v-mysql-a-php/comment-page-1/#comment-379 Tom Thu, 06 Jan 2011 23:14:03 +0000 http://www.havlena.net/blog/?p=860#comment-379 Proc je tam tato podminka - HAVING distance < mydistance ??? kdyz preci, jestli se objekt nachazi v rozmezi urcenem pomoci mydistance, tak je tam tato podminka - building_longitude BETWEEN lon1 AND lon2 AND building_latitude BETWEEN lat1 AND lat2 diky Proc je tam tato podminka – HAVING distance < mydistance ???
kdyz preci, jestli se objekt nachazi v rozmezi urcenem pomoci mydistance, tak je tam tato podminka – building_longitude BETWEEN lon1 AND lon2 AND building_latitude BETWEEN lat1 AND lat2

diky

]]> Od: Matouš Havlena http://www.havlena.net/blog/hledani-vzdalenosti-gps-souradnic-v-mysql-a-php/comment-page-1/#comment-327 Matouš Havlena Wed, 26 May 2010 00:17:35 +0000 http://www.havlena.net/blog/?p=860#comment-327 Ano ma :) Mel jsem tam chybu, clanek jsem opravil. Diky za upozorneni! Ano ma :) Mel jsem tam chybu, clanek jsem opravil. Diky za upozorneni!

]]> Od: 14113 http://www.havlena.net/blog/hledani-vzdalenosti-gps-souradnic-v-mysql-a-php/comment-page-1/#comment-326 14113 Mon, 24 May 2010 13:30:35 +0000 http://www.havlena.net/blog/?p=860#comment-326 Opravdu super clanek. Jen jsem se chtel zeptat, kdyz nastavujes hodnotu promenne lon1 a 2 nema se pouzivat mydistance namistno distance?? Opravdu super clanek.
Jen jsem se chtel zeptat, kdyz nastavujes hodnotu promenne lon1 a 2 nema se pouzivat mydistance namistno distance??

]]> Od: John Hamelink http://www.havlena.net/blog/hledani-vzdalenosti-gps-souradnic-v-mysql-a-php/comment-page-1/#comment-317 John Hamelink Wed, 03 Mar 2010 00:17:26 +0000 http://www.havlena.net/blog/?p=860#comment-317 Thank you for this. I have been looking for some precise yet concise instructions on how to do this, and these look good. If I have any problems implementing, I'll let you know :) Thanks, John. Thank you for this. I have been looking for some precise yet concise instructions on how to do this, and these look good. If I have any problems implementing, I’ll let you know :)

Thanks,
John.

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