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[rails.git] / db / functions / maptile.c

diff --git a/db/functions/maptile.c b/db/functions/maptile.c
index 2c15d2b411c27bc0544885a742a041103f207f7b..ed83bcce29f1f88605c59163d2b470f42ccc4ad3 100644 (file)
--- a/db/functions/maptile.c
+++ b/db/functions/maptile.c
@@ -55,12 +55,16 @@ long long maptile_for_point(UDF_INIT *initid, UDF_ARGS *args, char *is_null, cha
    double       lat = *(long long *)args->args[0] / 10000000.0;
    double       lon = *(long long *)args->args[1] / 10000000.0;
    long long    zoom = *(long long *)args->args[2];
-   
+
    return internal_maptile_for_point(lat, lon, zoom);
 }
 #endif
 
 #ifdef USE_PGSQL
+#ifdef USE_MYSQL
+#error ONLY one of USE_MYSQL and USE_PGSQL should be defined
+#endif
+
 #include <postgres.h>
 #include <fmgr.h>
 
@@ -70,12 +74,22 @@ maptile_for_point(PG_FUNCTION_ARGS)
   double lat = PG_GETARG_INT64(0) / 10000000.0;
   double lon = PG_GETARG_INT64(1) / 10000000.0;
   int zoom = PG_GETARG_INT32(2);
-  
+
   PG_RETURN_INT32(internal_maptile_for_point(lat, lon, zoom));
 }
 
 PG_FUNCTION_INFO_V1(maptile_for_point);
 
+/*
+ * To bind this into PGSQL, try something like:
+ *
+ * CREATE FUNCTION maptile_for_point(int8, int8, int4) RETURNS int4
+ *  AS '/path/to/rails-port/db/functions/libpgosm', 'maptile_for_point'
+ *  LANGUAGE C STRICT;
+ *
+ * (without all the *s)
+ */
+
 #ifdef PG_MODULE_MAGIC
 PG_MODULE_MAGIC;
 #endif