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>Chapter 31. <SPAN
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>libpq</SPAN
> - C Library</TD
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>31.16. The Connection Service File</A
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><P
>   The connection service file allows libpq connection parameters to be
   associated with a single service name. That service name can then be
   specified by a libpq connection, and the associated settings will be
   used. This allows connection parameters to be modified without requiring
   a recompile of the libpq application. The service name can also be
   specified using the <TT
CLASS="ENVAR"
>PGSERVICE</TT
> environment variable.
  </P
><P
>   The connection service file can be a per-user service file
   at <TT
CLASS="FILENAME"
>~/.pg_service.conf</TT
> or the location
   specified by the environment variable <TT
CLASS="ENVAR"
>PGSERVICEFILE</TT
>,
   or it can be a system-wide file
   at <TT
CLASS="FILENAME"
>`pg_config --sysconfdir`/pg_service.conf</TT
> or in the directory
   specified by the environment variable
   <TT
CLASS="ENVAR"
>PGSYSCONFDIR</TT
>.  If service definitions with the same
   name exist in the user and the system file, the user file takes
   precedence.
  </P
><P
>   The file uses an <SPAN
CLASS="QUOTE"
>"INI file"</SPAN
> format where the section
   name is the service name and the parameters are connection
   parameters; see <A
HREF="libpq-connect.html#LIBPQ-PARAMKEYWORDS"
>Section 31.1.2</A
> for a list.  For
   example:
</P><PRE
CLASS="PROGRAMLISTING"
># comment
[mydb]
host=somehost
port=5433
user=admin</PRE
><P>
   An example file is provided at
   <TT
CLASS="FILENAME"
>share/pg_service.conf.sample</TT
>.
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