MaisonBisson.com » unimplemented http://maisonbisson.com A bunch of stuff I would have emailed you about. Sat, 14 Nov 2009 20:14:03 +0000 http://wordpress.org/?v=2.8.6 en hourly 1 Calculating Distance Between Points In MySQL http://maisonbisson.com/blog/post/12146/calculating-distance-between-points-in-mysql/ http://maisonbisson.com/blog/post/12146/calculating-distance-between-points-in-mysql/#comments Wed, 11 Jun 2008 02:15:57 +0000 Casey Bisson http://maisonbisson.com/blog/?p=12146

MySQL has some powerful, and perhaps underused spatial extensions, but the most interesting functions are still unimplemented: “Note: Currently, MySQL does not implement these functions…”

Among those as-yet unimplemented functions is DISTANCE(). Alternatives can be found here and here, though neither is clean or simple. I wonder if a simple MBRContains() is good enough, though…

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Found in the MySQL 5.0 Reference Manual:

  • Related(g1,g2,pattern_matrix)
    Returns 1 or 0 to indicate whether the spatial relationship specified by pattern_matrix exists between g1 and g2. Returns –1 if the arguments are NULL. The pattern matrix is a string. Its specification will be noted here if this function is implemented.

(emphasis mine.)

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