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copied!<p>You can find a usefull post here: </p> <p><a href="http://blog.jcole.us/2007/11/24/on-efficiently-geo-referencing-ips-with-maxmind-geoip-and-mysql-gis/" rel="nofollow">http://blog.jcole.us/2007/11/24/on-efficiently-geo-referencing-ips-with-maxmind-geoip-and-mysql-gis/</a></p> <p>I have used this post as a "starting point" for a project over 150milions of record -myisam- and it works fine</p> <p>BTW, in general the best way is to use the <code>GEOMETRY</code> and <code>SPATIAL INDEX</code> -only for myisam- like as follow:</p> <ul> <li><code>ALTER TABLE <table> ADD geom_point GEOMETRY NOT NULL ;</code></li> <li><code>ALTER TABLE <table> ADD SPATIAL INDEX geom_point (geom_point) ;</code></li> <li><code>UPDATE <table> SET geom_point = POINT(latitude, longitude);</code></li> </ul> <p>Now you can find all "names" into a "square" using a query like this:</p> <pre><code>SELECT * from <table> WHERE MBRContains(GeomFromText('LineString(<lata> <lona>, <latb> <lonb>)'), geom_point) </code></pre> <p>Or by distance like:</p> <pre><code>$longitude = 8.449997; $latitude = 45.550003; $distance = 50; # km $point1 = $latitude + $distance / ( 111.1 / cos($latitude)); $point2 = $longitude + $distance / 111.1; $point3 = $latitude - $distance / ( 111.1 / cos($latitude)); $point4 = $longitude - $distance / 111.1; SELECT * from <table> WHERE MBRContains(GeomFromText('LineString(<$point1> <$point2>, <$point3> <$point4>)'), geom_point) </code></pre> <p>Try on your test table ;)</p>

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