Question

I have a column in my SQLite database that contains a file path. Given a portion of the file path, I need to return all the next folders. I would also like to return whether the next portion is the last path in the string (or does not end in a ‘/’). So if I have the folders:

/my/folder/one
/my/folder/two
/my/folder/path/three
/another/path
/one/two/three

And I have the path:

/my/folder/

The result would return something along the lines of:

+----------+------+
| isLast   | item |
+----------+------+
|    1     | one  |
|    1     | two  |
|    0     | path |
+----------+------+

I’ve been struggling with this for a while so if anyone can provide any guidance it would be greatly appreciated.

Answer 1

This query:

SELECT item NOT GLOB '*/*' AS isLast,
       item
FROM (SELECT substr(MyPath, length('/my/folder/') + 1) AS item
      FROM MyTable
      WHERE MyPath GLOB '/my/folder/' || '*')

will give you a result like this:

isLast  item
------  ----
1       one
1       two
0       path/three

Removing the subpath requires the instr() function, which was only recently introduced in SQLite 3.7.15:

SELECT isLast,
       CASE WHEN isLast
         THEN item
         ELSE substr(item, 1, instr(item, '/') - 1)
       END AS item
FROM (SELECT item NOT GLOB '*/*' AS isLast,
             item
      FROM (SELECT substr(MyPath, length('/my/folder/') + 1) AS item
            FROM MyTable
            WHERE MyPath GLOB '/my/folder/' || '*'))