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From "Yiyi Sun" <yiyi...@yahoo.com>
Subject Re: DBTags and Memo fields
Date Tue, 12 Jun 2001 10:43:13 GMT
Thank you very much. I will give it a try.

Yiyi



> Well, I checked it out, and it appears that, in your case, the drivers
> should be using getColumn:
>
>       ResultSetMetaData meta = getMetaData();
>       String string = null;
>       switch (meta.getColumnType(position)) {
>       case (Types.CLOB):
>         try {
>           string = readClob(rset.getClob(position));
>         } catch (IOException e) {
>           throw new JspTagException(e.toString());
>         } catch (SQLException e) {
>           throw new JspTagException(e.toString());
>         }
>         break;
>       default:
>         string = rset.getString(position);
>       }
>
> So, if the column type is undefined (as in the case of the memo field),
> then the getColumn() method is called.
>
> You could try sending a stack trace to the list.  Maybe the specific
> exception will help.
>
> - Morgan
>
>
> On Mon, 11 Jun 2001, Morgan Delagrange wrote:
>
> > Ah, that's interesting.  If memo fields don't return one of the standard
> > JDBC constants, that might cause unpredictable behaviour.  Let me take a
> > look see and make sure that it will default to getColumn().
> >
> > On Fri, 8 Jun 2001, Yiyi Sun wrote:
> >
> > > As I said we cannot use DBTags with jdbc-odbc. I think that's a
problem of
> > > the driver. jdbc-odbc bridge too. The getColumnType() returns -1 on my
memo
> > > field.
> > >
> > > Yiyi
> > >
> > > > Hmm, doesn't sounds quite right.  The getColumn tag only uses the
> > > > getClob() method for CLOB data types; in all other cases, it uses
> > > > getString().  This sounds like a driver issue, but I can't be
certain.
> > > >
> > > > On Tue, 5 Jun 2001, Yiyi Sun wrote:
> > > >
> > > > > Hi Morgan,
> > > > >
> > > > > The memo type is very useful to store the large text. I used to
use the
> > > > > getString(...) method of the Statement class to read memo fields
while
> > > using
> > > > > the jdbc-odbc bridge and MS Access.
> > > > >
> > > > > I found in the source that the GetColumnTag class uses JDBC 2.0's
Clob
> > > class
> > > > > . In JDK1.3 and beofore, the jdbc-odbc bridge is only JDBC 1.1. In
> > > JDK1.4
> > > > > the bridge will be JDBC 2.0 that could support Clob. Until the
finaly
> > > > > release of JDK1.4 in Q4 of this year, it seems that we cannot use
DBTags
> > > > > with jdbc-odbc.
> > > > >
> > > > > Is it right?
> > > > >
> > > > > Cheers!
> > > > >
> > > > > Yiyi
> > > > >
> > > > >
> > > > >
> > > > > > I've never heard of the memo type.  Have you successfully
accessed
> > > memo
> > > > > > fields with JDBC drivers?  If so, how did you do it?
> > > > > >
> > > > > > It's possible that memo fields are not supported by your JDBC
drivers.
> > > > > >
> > > > > > On Sat, 2 Jun 2001, Yiyi Sun wrote:
> > > > > >
> > > > > > > Hi All,
> > > > > > >
> > > > > > > When I am using DBTags with jdbc:odbc and MS Access database,
the
> > > > > > > <sql:getColumn ... /> Tag raises java.sql.SQLException
if the
fields
> > > to
> > > > > be
> > > > > > > read are of memo type.
> > > > > > >
> > > > > > > Any workaround or suggestion? Thanks
> > > > > > >
> > > > > > > Yiyi
> > > > > > >
> > > > > > >
> > > > >
> > > > >
> > >
> > >
> >
> >


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