Re: Implementing setBinaryStream(int, InputStream, long)

First of all thanks for the effort, and secondly welcome to the
ambiguity of JDBC.

Looking at QueryExecutorImpl.java PSQLException is thrown for errors
in executing the protocol.
Integer.MAX_VALUE seems like a very large number but if the protocol
supports it we should use it. The user on the other hand may want to
reconsider.

Thanks,

Dave Cramer

dave.cramer(at)credativ(dot)ca
http://www.credativ.ca

On Tue, May 29, 2012 at 9:45 AM, Johann 'Myrkraverk' Oskarsson
<johann(at)2ndquadrant(dot)com> wrote:
> Hi all,
>
> I have implemented the JDBC 4 function setBinaryStream(int, InputStream,
> long) in the PreparedStatement.  It is a bit of a hack since I added
> long to the ParameterList interface and StreamWrapper.  I suppose that
> was a bit of an overkill.
>
> PostgreSQL doesn't support field values larger than 1GB according to
> http://www.postgresql.org/about/ so I suppose a check if the length
> given is larger than Integer.MAX_VALUE and throw an exception is
> reasonable.  What exception makes sense?  The Integer.MAX_VALUE is
> chosen based on the underlying protocol using length values in int32.
>
> Is there any sense in choosing a smaller value for this?
>
> With the appropriate check, the implementation is trivial:
>
>  preparedParameters.setBytea( parameterIndex, value, (int) length );
>
> The V3 protocol does not allow piecewise transmission of data, so
> implementing setBinaryStream( int, InputStream ) makes no sense.  Notice
> the absense of the length field.
>
> I can submit a patch once I know to deal with values that don't fit in
> an int.
>
>
> --
>   Johann Oskarsson                http://www.2ndquadrant.com/    |[]
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