Re: LTREE extension and "order by"

Try it:
select * from comments where article_id = 2 order by
string_to_array(path::text,'.')::integer[];

2011/7/21 Ivan Polak <ivan(dot)polak(at)f4s(dot)sk>

> Hi, thank you for your answer, please can You send me complete select
> command how to convert ltree column to integer[] and use it to order
> by.
>
> thanks
>
> Ivan
>
> 2011/7/21 pasman pasmański <pasman(dot)p(at)gmail(dot)com>:
> > Hi.
> >
> > You should convert path to integer[].
> >
> > 2011/7/20, Ivan Polak <ivan(dot)polak(at)f4s(dot)sk>:
> >> Hi,
> >>
> >> in postgreSQL (with LTREE extension) database I have the following
> >> table "comments":
> >>
> >> id BIGINT /* id */
> >> article_id BIGINT /*article-id */
> >> parent_id BIGINT
> >> comment TEXT
> >> path LTREE
> >> level INTEGER /* level */
> >>
> >> with the following rows:
> >>
> >> id article_id comment parent_id path level
> >> 1 1 aaaa 1 1
> >> 2 1 bbbb 1 1.2 2
> >> 3 1 cccc 2 1.2.3 3
> >> 4 1 dddd 2 1.4 2
> >> 5 1 eeee 4 1.4.5 3
> >> 6 1 ffff 6 1
> >> 7 1 gggg 6 6.7 2
> >> 8 1 hhhh 6 6.8 2
> >> 9 1 iiii 9 1
> >> 10 1 jjjj 10 1
> >> 11 1 kkkk 5 1.4.5.11 4
> >>
> >> and I need to select complete tree (with correct order of comments).
> >>
> >> SELECT * from comments where article_id = 2 order by <???>
> >>
> >> when I used:
> >>
> >> SELECT * from comments where article_id = 2 order by path
> >>
> >> the result is:
> >>
> >> id comment path
> >> 1 aaaa 1
> >> 2 bbbb 1.2
> >> 3 cccc 1.2.3
> >> 4 dddd 1.4
> >> 5 eeee 1.4.5
> >> 11 kkkk 1.4.5.11
> >> 10 jjjj 10
> >> 6 ffff 6
> >> 7 gggg 6.7
> >> 8 hhhh 6.8
> >> 9 iiii 9
> >>
> >> BUT, it is wrong, because comment with id = 10 is after comment with
> id=11
> >>
> >> (i know, this is correct, because ordering by column PATH [as TEXT],
> >> and 10 is 'after' 1.4.5.11)
> >>
> >> , but I need :
> >>
> >> id comment path
> >> 1 aaaa 1
> >> 2 bbbb 1.2
> >> 3 cccc 1.2.3
> >> 4 dddd 1.4
> >> 5 eeee 1.4.5
> >> 11 kkkk 1.4.5.11
> >> 6 ffff 6
> >> 7 gggg 6.7
> >> 8 hhhh 6.8
> >> 9 iiii 9
> >> 10 jjjj 10
> >>
> >> thanks
> >>
> >> Ivan
> >>
> >> --
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> >>
> >
> >
> > --
> > ------------
> > pasman
> >
> > --
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> >
>
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