On 06/20/2014 12:10 AM, Alysson Gonçalves de Azevedo wrote:
sqlite> INSERT INTO abc VALUES(NULL, 20, 10);
*The first column is always a 64-bit signed integer primary key*.
Right, but if you insert NULL it assigns a value automatically. The
constraint failure is because the minimum value of the first dimension
is larger than the maximum.
SQLite version 3.8.5 2014-06-19 12:34:33
...
sqlite> CREATE VIRTUAL TABLE abc USING rtree(id,x,y);
sqlite> INSERT INTO abc VALUES(1, 20, 10);
Error: constraint failed
sqlite> INSERT INTO abc VALUES(NULL, 10, 20);
sqlite> SELECT * FROM abc;
1|10.0|20.0
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>
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