> > sqlite> INSERT INTO abc VALUES(NULL, 20, 10);
*The first column is always a 64-bit signed integer primary key*. The other >> columns are pairs, one pair per dimension, containing the minimum and >> maximum values for that dimension, respectively. >> > Alysson Gonçalves de Azevedo "Anarcho-syndicalism is a way of preserving freedom." - Monty Python 2014-06-19 14:06 GMT-03:00 Dan Kennedy <danielk1...@gmail.com>: > On 06/19/2014 11:57 PM, Mohit Sindhwani wrote: > >> Hi Wolfgang, >> >> On 19/6/2014 11:54 PM, Wolfgang Enzinger wrote: >> >>> Not sure why you think you have to store those point coordinates twice. >>> >>> This works: >>> >>> sqlite> CREATE VIRTUAL TABLE abc USING rtree(id,x,y); >>> sqlite> INSERT INTO abc VALUES(1,20,30); >>> sqlite> SELECT id FROM abc WHERE x>=10 AND x<=30 AND y >=20 AND y<=40; >>> 1 >>> sqlite> SELECT id FROM abc WHERE x>=40 AND x<=50 AND y >=40 AND y<=50; >>> sqlite> >>> >> >> I do feel a bit stupid after reading your email... but I guess I was >> working on the basis that the data we have is 2 dimensional and my >> recollection was that we need 2 items per dimension. >> >> Am I reading this wrong? >> The SQLite R*Tree module is implemented as a virtual table. Each R*Tree >> index is a virtual table with an odd number of columns between 3 and 11. >> The first column is always a 64-bit signed integer primary key. The other >> columns are pairs, one pair per dimension, containing the minimum and >> maximum values for that dimension, respectively. A 1-dimensional R*Tree >> thus has 3 columns. A 2-dimensional R*Tree has 5 columns. A 3-dimensional >> R*Tree has 7 columns. A 4-dimensional R*Tree has 9 columns. And a >> 5-dimensional R*Tree has 11 columns. The SQLite R*Tree implementation does >> not support R*Trees wider than 5 dimensions. >> > > Probably not. The CREATE TABLE code above actually creates a 1-dimensional > r-tree with deceptive column names. Column "y" contains the maximum value > for the first dimension: > > SQLite version 3.8.5 2014-06-19 12:34:33 > Enter ".help" for usage hints. > Connected to a transient in-memory database. > Use ".open FILENAME" to reopen on a persistent database. > > sqlite> CREATE VIRTUAL TABLE abc USING rtree(id,x,y); > sqlite> INSERT INTO abc VALUES(NULL, 20, 10); > Error: constraint failed > sqlite> > > > > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
