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From Geoff Chiang <geoffchi...@yahoo.com>
Subject Re: ClobTypeHandlerCallback For Oracle 9i
Date Wed, 25 May 2005 23:01:59 GMT
Ronn, are you using iBatis in combination with the
Spring framework?  I'm currently doing that
successfully whilst still using the 9i drivers.  Just
now I tested the insertion of three clobs of over 32k
characters and didn't see any reordering or
exceptions.

Geoff

--- Ronn <ronn.jr@gmail.com> wrote:

> Hi,
> 
> I am trying to insert clobs into Oracle 9i with
> Oracle 10g JDBC drivers.
> The problems I'm facing are:
> 
> 1) Tried using iBatis ClobTypeHandlerCallback, but
> encountered error
> of unable to setString with > 32K
> 
> 2) Override ClobTypeHandlerCallback's setParameter
> to remove the last line
> //setter.setString((String)parameter);
> so that I can bypass the error. It works if I am
> inserting 1 clob
> only. If I'm inserting 2 clobs,
> e.g. (key, clob1, clob2), it will work fine if the
> clobs are small. If
> i'm inserting 2 very large clobs, the order of the
> clobs in the
> database is reversed, i.e. it becomes
> (key,clob2,clob1). My fellow
> developers and I have totally no idea why this
> actually happened.
> 
> So what I did was to do an insert for the first
> clob, then follow by
> an update on the 2nd clob.
> 
> 3) Once in a while, I am getting "io exception:
> software caused
> connection abort: socket write error" or "No more
> data to read" when I
> do an insertion of clob. This really kills my App.
> Does anyone has the
> solution to this?
>  
> 4) I thought the above problem may be caused by the
> removal of 
> setter.setString((String)parameter), hence I tried
> the alternative of
> using Spring's ClobStringTypeHandler instead.
> However, I got a
> ClassCastException when it is parsing the SqlMap's
> Parameter.
> 
> Does anyone has solution for inserting clobs which
> are > 32K and will
> not encounter the socket write error?
> 
> Is anyone using the oracle.sql.CLOB solution? Ever
> hit the socket
> write error or no more data to read error?
> 
> I will appreciate some help here. Thanks!
> 
> Regards,
> Ronn
> 
> >Can you use the Oracle 10g driver?
> 
> >Cheers,
> >Clinton
> 
> 
> On Wed, 9 Feb 2005 17:42:45 -0000, Peter Nunn
> <[EMAIL PROTECTED]> wrote:
> > I've been trying (for a while now) to implement a
> TypeHandlerCallback that 
> > can WRITE clobs under Oracle 9i. It appears that
> this isn't possible. If 
> > anyone has a solution to this then I'd be grateful
> for your assistance. Up to 
> > now I haven't seen a workable solution.
> > 
> > So far I have tried the following:
> > 
> > 1) Call setter.setString(s).
> > 
> > This fails because setString(x) has an upper limit
> of 4K.
> > 
> > 2) Call setter.setCharacterStream(reader,
> s.length()). i.e. use same approach 
> > as 2.0.9 ClobTypeHandlerCallback implementation.
> > 
> > This doesn't work either.
> > 
> > 3) Attempt to work with Oracle extension, namely
> oracle.sql.CLOB. The 
> > preferred solution.
> > 
> > This isn't possible because you cannot create an
> instance of oracle.sql.CLOB 
> > directly. You need to either:
> > 
> > a) create a temporary CLOB via a call to
> CLOB.createTemporary(...). This 
> > requires a Connection object. Since
> ParameterSetter doesn't expose the 
> > PreparedStatement we cannot get hold of the
> Connection object. So this 
> > approach is a non-starter. Even if we did have the
> connection things aren't 
> > straightforward because we need an
> OracleConnection... which you won't have 
> > if you are using a DataSource to obtain your
> connections.
> > 
> > b) execute a SELECT statement to obtain a
> ResultSet then obtain the CLOB 
> > instance by calling ResultSet.getClob("field").
> This clearly isn't an option 
> > from within a TypeHandlerCallback.
> > 
> > I'd really appreciate some help here... I've hit a
> brick wall. As of now I've 
> > come to the conclusion that iBatis cannot handle
> CLOBS in Oracle prior to 
> > 10g. This is clearly an issue.
> > 
> > So the only remaining option is to write a JDBC
> Dao implementation and bypass 
> > SQLMAPS...any improvements upon this?
> > 
> > Peter Nunn
> > Senior Java Developer
> > EMAP UK IT
> > Telephone: 020 7017 3601
> > Mobile: 07866 670 530
> > 
> > ** For Emap magazine subscriptions & gift offers
> visit 
> > http://www.greatmagazines.co.uk/emap **
> > 
> >
>
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