Re: SDriverOracle OffesetStrategy
Franck Routier <[email protected]> Wed, 06 Feb 2013 17:17:51 +0100
| Newsgroups | gmane.comp.java.orm.simpleorm |
|---|---|
| Message-ID | <[email protected]> |
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Hi,
Le 05/02/2013 00:40, anthony berglas a =E9crit :
>
> Again, it amazes me after all these years that Oracle does not support=20
> these facilities more easily. Why put up a barrier for people to=20
> migrate to Oracle!
>
Well, I just discovered another gotcha with this 'rownum' approach.
In this end, we embed a query within one (limit) or two (limit/offset)=20
layers of Oracle specific query like this:
select realquery.* from
(select .... from ....) realquery
where rownum < limit
This is well, but... Oracle puts another gotcha here.
In Postgresql, you can do this :
select * from (
select id, id from mytable) realquery;
works fine.
Doing the same in Oracle will result in 00918. 00000 - "column=20
ambiguously defined".
You cannot select * from a subquery that as several columns named or=20
aliased the same...
This won't probably hurt anyone in Simpleorm, except if using a=20
rawQuery, with several columns named the same, and with limit/offset,=20
under Oracle.
Well, guess what: we do that in our project... I will change this, as=20
this has no real interest, but it was an automatically generated query,=20
and it was convinient not to bother.
I really prefer Postgresql in many ways. But our customers tend to have=20
invested a lot in Oracle....
Regards,
Franck
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<div class=3D"moz-cite-prefix">Hi,<br>
<br>
Le 05/02/2013 00:40, anthony berglas a écrit :<br>
</div>
<blockquote
cite=3D"mid:[email protected].=
com"
type=3D"cite">
<span style=3D"display:none"> </span>
=20=20=20=20=20=20
<div id=3D"ygrp-text"><br>
<div>Again, it amazes me after all these years that Oracle
does not support these facilities more easily. Why put =
up
a barrier for people to migrate to Oracle!</div>
<br>
</div>
</div>
</div>
</blockquote>
Well, I just discovered another gotcha with this 'rownum' approach.<br>
<br>
In this end, we embed a query within one (limit) or two
(limit/offset) layers of Oracle specific query like this:<br>
<br>
select realquery.* from <br>
(select .... from ....) realquery<br>
where rownum < limit<br>
<br>
This is well, but... Oracle puts another gotcha here.<br>
<br>
In Postgresql, you can do this :<br>
<br>
select * from (<br>
select id, id from mytable) realquery;<br>
<br>
works fine.<br>
<br>
Doing the same in Oracle will result in 00918. 00000 - "column
ambiguously defined".<br>
You cannot select * from a subquery that as several columns named or
aliased the same...<br>
This won't probably hurt anyone in Simpleorm, except if using a
rawQuery, with several columns named the same, and with
limit/offset, under Oracle.<br>
<br>
Well, guess what: we do that in our project... I will change this,
as this has no real interest, but it was an automatically generated
query, and it was convinient not to bother.<br>
<br>
I really prefer Postgresql in many ways. But our customers tend to
have invested a lot in Oracle....<br>
<br>
Regards,<br>
<br>
Franck<br>
<br>
<br>
</body>
</html>
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