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Do not pass server_encoding to the client.

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libpq, talking to an old server, should assume SQL_ASCII as the default
client encoding, because that is what the server will actually use (not
the server encoding).
This commit is contained in:
Peter Eisentraut
2003-09-01 23:04:49 +00:00
parent f10a9033bf
commit 5f65345a57
4 changed files with 22 additions and 34 deletions
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19
doc/src/sgml/libpq.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.133 2003/08/31 17:32:19 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.134 2003/09/01 23:04:49 petere Exp $
-->
<chapter id="libpq">
@ -856,21 +856,20 @@ is not known.
<para>
Parameters reported as of the current release include
<literal>server_version</> (cannot change after startup);
<literal>server_encoding</> (also not presently changeable after start);
<literal>client_encoding</>,
<literal>is_superuser</>, and
<literal>DateStyle</>.
</para>
<para>
Pre-3.0-protocol servers do not report parameter settings,
but <application>libpq</> includes logic to obtain values for
<literal>server_version</>, <literal>server_encoding</>, and
<literal>client_encoding</>. Applications are encouraged to use
<function>PQparameterStatus</> rather than ad-hoc code to determine these
values. (Beware however that on a pre-3.0 connection, changing
<literal>client_encoding</> via <command>SET</> after connection startup
will not be reflected by <function>PQparameterStatus</>.)
Pre-3.0-protocol servers do not report parameter settings, but
<application>libpq</> includes logic to obtain values for
<literal>server_version</>, and <literal>client_encoding</>.
Applications are encouraged to use <function>PQparameterStatus</>
rather than ad-hoc code to determine these values. (Beware however
that on a pre-3.0 connection, changing <literal>client_encoding</> via
<command>SET</> after connection startup will not be reflected by
<function>PQparameterStatus</>.)
</para>
</listitem>
</varlistentry>

3
doc/src/sgml/protocol.sgml
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@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/protocol.sgml,v 1.41 2003/08/14 20:09:31 tgl Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/protocol.sgml,v 1.42 2003/09/01 23:04:49 petere Exp $ -->
<chapter id="protocol">
<title>Frontend/Backend Protocol</title>
@ -1005,7 +1005,6 @@
ParameterStatus will be generated: they are
<literal>server_version</> (a pseudo-parameter that cannot change after
startup);
<literal>server_encoding</> (also not presently changeable after start);
<literal>client_encoding</>,
<literal>is_superuser</>, and
<literal>DateStyle</>.