<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>Control Functions</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REV="MADE"
HREF="mailto:pgsql-docs@postgresql.org"><LINK
REL="HOME"
TITLE="PostgreSQL 8.3.6 Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="libpq - C Library"
HREF="libpq.html"><LINK
REL="PREVIOUS"
TITLE="Functions Associated with the COPY Command"
HREF="libpq-copy.html"><LINK
REL="NEXT"
TITLE="Miscellaneous Functions"
HREF="libpq-misc.html"><LINK
REL="STYLESHEET"
TYPE="text/css"
HREF="stylesheet.css"><META
HTTP-EQUIV="Content-Type"
CONTENT="text/html; charset=ISO-8859-1"><META
NAME="creation"
CONTENT="2009-02-03T04:34:16"></HEAD
><BODY
CLASS="SECT1"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="5"
ALIGN="center"
VALIGN="bottom"
>PostgreSQL 8.3.6 Documentation</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
HREF="libpq-copy.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
HREF="libpq.html"
>Fast Backward</A
></TD
><TD
WIDTH="60%"
ALIGN="center"
VALIGN="bottom"
>Chapter 30. <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> - C Library</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="top"
><A
HREF="libpq.html"
>Fast Forward</A
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="top"
><A
HREF="libpq-misc.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="LIBPQ-CONTROL"
>30.9. Control Functions</A
></H1
><P
> These functions control miscellaneous details of <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s
behavior.
</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><CODE
CLASS="FUNCTION"
>PQclientEncoding</CODE
>
<A
NAME="AEN32414"
></A
></DT
><DD
><P
> Returns the client encoding.
</P><PRE
CLASS="SYNOPSIS"
> int PQclientEncoding(const PGconn *<TT
CLASS="REPLACEABLE"
><I
>conn</I
></TT
>);
</PRE
><P>
Note that it returns the encoding ID, not a symbolic string
such as <TT
CLASS="LITERAL"
>EUC_JP</TT
>. To convert an encoding ID to an encoding name, you
can use:
</P><PRE
CLASS="SYNOPSIS"
>char *pg_encoding_to_char(int <TT
CLASS="REPLACEABLE"
><I
>encoding_id</I
></TT
>);</PRE
><P>
</P
></DD
><DT
><CODE
CLASS="FUNCTION"
>PQsetClientEncoding</CODE
>
<A
NAME="AEN32426"
></A
></DT
><DD
><P
> Sets the client encoding.
</P><PRE
CLASS="SYNOPSIS"
> int PQsetClientEncoding(PGconn *<TT
CLASS="REPLACEABLE"
><I
>conn</I
></TT
>, const char *<TT
CLASS="REPLACEABLE"
><I
>encoding</I
></TT
>);
</PRE
><P>
<TT
CLASS="REPLACEABLE"
><I
>conn</I
></TT
> is a connection to the server,
and <TT
CLASS="REPLACEABLE"
><I
>encoding</I
></TT
> is the encoding you want to
use. If the function successfully sets the encoding, it returns 0,
otherwise -1. The current encoding for this connection can be
determined by using <CODE
CLASS="FUNCTION"
>PQclientEncoding</CODE
>.
</P
></DD
><DT
><CODE
CLASS="FUNCTION"
>PQsetErrorVerbosity</CODE
>
<A
NAME="AEN32439"
></A
></DT
><DD
><P
> Determines the verbosity of messages returned by
<CODE
CLASS="FUNCTION"
>PQerrorMessage</CODE
> and <CODE
CLASS="FUNCTION"
>PQresultErrorMessage</CODE
>.
</P><PRE
CLASS="SYNOPSIS"
> typedef enum {
PQERRORS_TERSE,
PQERRORS_DEFAULT,
PQERRORS_VERBOSE
} PGVerbosity;
PGVerbosity PQsetErrorVerbosity(PGconn *conn, PGVerbosity verbosity);
</PRE
><P>
<CODE
CLASS="FUNCTION"
>PQsetErrorVerbosity</CODE
> sets the verbosity mode, returning
the connection's previous setting. In <I
CLASS="FIRSTTERM"
>TERSE</I
> mode,
returned messages include severity, primary text, and position only;
this will normally fit on a single line. The default mode produces
messages that include the above plus any detail, hint, or context
fields (these might span multiple lines). The <I
CLASS="FIRSTTERM"
>VERBOSE</I
>
mode includes all available fields. Changing the verbosity does not
affect the messages available from already-existing
<TT
CLASS="STRUCTNAME"
>PGresult</TT
> objects, only subsequently-created ones.
</P
></DD
><DT
><CODE
CLASS="FUNCTION"
>PQtrace</CODE
>
<A
NAME="AEN32453"
></A
></DT
><DD
><P
> Enables tracing of the client/server communication to a debugging file stream.
</P><PRE
CLASS="SYNOPSIS"
> void PQtrace(PGconn *conn, FILE *stream);
</PRE
><P>
</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
> On Windows, if the <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> library and an application are
compiled with different flags, this function call will crash the
application because the internal representation of the <TT
CLASS="LITERAL"
>FILE</TT
>
pointers differ. Specifically, multithreaded/single-threaded,
release/debug, and static/dynamic flags should be the same for the
library and all applications using that library.
</P
></BLOCKQUOTE
></DIV
></DD
><DT
><CODE
CLASS="FUNCTION"
>PQuntrace</CODE
>
<A
NAME="AEN32465"
></A
></DT
><DD
><P
> Disables tracing started by <CODE
CLASS="FUNCTION"
>PQtrace</CODE
>.
</P><PRE
CLASS="SYNOPSIS"
> void PQuntrace(PGconn *conn);
</PRE
><P>
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="libpq-copy.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="libpq-misc.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Functions Associated with the <TT
CLASS="COMMAND"
>COPY</TT
> Command</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="libpq.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Miscellaneous Functions</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>
distrib
>
Mandriva
>
2008.1
>
x86_64
>
media
>
main-testing
>
by-pkgid
>
bab02a23fa9f3df8d66a9a3231b50245
>
files
>
340
