Re: Search using like in a clob column

From: Gus Spier <gus.spier_at_gmail.com>
Date: Mon, 30 Aug 2010 23:10:05 -0400
Message-ID: <AANLkTi=DsmV6_dT=y76ggpUq3cYUv7MUjWHNXkOsLE8d_at_mail.gmail.com>

You don't mention what version of Oracle you're using. I haven't had opportunity to play around with them, but are Regular Expressions an option available to you?

Regards,
Gus

On Mon, Aug 30, 2010 at 12:56 PM, Octavian Rasnita <orasnita_at_gmail.com>wrote:

> Hello,
>
> I have tried to search in a clob column using the like operator, but I can
> see that it doesn't work as expected.
>
> Is there a way of using a longer kind of varchar2 column, say... one that
> contains up to 200 KB to be able to search using the like operator?
>
> I am asking this because I can see that the clob columns have too many
> limitations and nowadays 200 KB doesn't mean a too "long" object.
>
> I see that I can search in a clob column using the like operator, but not
> case insensitively and I also found this search pretty strange, because if I
> use sqlplus I can search using something like:
>
> select * from table_name where clob_column like '%text%';
>
> It works, as well as:
> select * from table_name where CLOB_COLUMN like '%text%';
>
> ...but when I use the DBIx::Class ORM I can use the second line only
> (although the table name and the column were created without using quotes
> for forcing a certain column name case).
>
> I used:
>
> alter session set NLS_COMP='LINGUISTIC';
> alter session set NLS_SORT='BINARY_AI';
>
> (I have also tried to set only case insesitively and not accent
> insensitively using BINARY_CI, but with no good effect).
>
> If I have the same text in a varchar2 column, I can do the case and accent
> insensitive search, but not in the clob column because it returns the
> records only if they contain the exact match in that clob column.
>
> The reason I hope there is a way of avoiding to use Oracle Text is that the
> syntax I need to use is too specific to Oracle and I don't even know how
> easy would be to use it with the ORM I use.
>
> Thanks.
>
> Octavian
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

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Received on Mon Aug 30 2010 - 22:10:05 CDT