Re: Strings with null characters produce exceptions when selectedor inserted. Attempts to select messages with null bytes produces "ERROR:insufficient data left in message". And inserting produces "ERROR: invalidbyte sequence for encoding \"UTF8\":

Apologies for top post using a blackberry. The binary mode should be able to cope fine as it passes the length before
sendingthe data. Should be straightforward to add strings to patch.
 

John
------Original Message------
From: Craig Ringer
Sender: pgsql-jdbc-owner@postgresql.org
To: Kris Jurka
Cc: user2037@ymail.com
Cc: pgsql-jdbc@postgresql.org
Subject: Re: [JDBC] Strings with null characters produce exceptions when selectedor inserted. Attempts to select
messageswith null bytes produces "ERROR:insufficient data left in message". And inserting produces "ERROR: invalidbyte
sequencefor encoding \"UTF8\": 0x00".  Since a null character is avalid UTF code point why is it rejected by the JDBC
driver? The attachedtest can work with Mysql and their JDBC driver.
 
Sent: 4 Jun 2009 01:34

Kris Jurka wrote:
> 
> 
> On Wed, 3 Jun 2009, user2037@ymail.com wrote:
> 
>> Strings with null characters produce exceptions when selected or
>> inserted. Attempts to select messages with null bytes produces "ERROR:
>> insufficient data left in message". And inserting produces "ERROR:
>> invalid byte sequence for encoding \"UTF8\": 0x00".
>>
>> Since a null character is a valid UTF code point why is it rejected by
>> the JDBC driver?
> 
> Because the server can't handle it.  The server is written in C and
> tracks all textual data as C strings which are null terminated.  It
> cannot handle intermediate null bytes, so the driver is just providing
> that message as early as possible to you.

Note that the `bytea' type _does_ store null bytes fine.

It's interesting that \0x00 is in fact valid utf-8, since it raises the
question of whether Pg should in fact support null bytes in `text' and
`varchar' strings.

--
Craig Ringer

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