SECT1"
><H1
CLASS="SECT1"
><A
NAME="LIBPQ-ENVARS"
>31.14. Environment Variables</A
></H1
><P
>   The following environment variables can be used to select default
   connection parameter values, which will be used by
   <CODE
CLASS="FUNCTION"
>PQconnectdb</CODE
>, <CODE
CLASS="FUNCTION"
>PQsetdbLogin</CODE
> and
   <CODE
CLASS="FUNCTION"
>PQsetdb</CODE
> if no value is directly specified by the calling
   code.  These are useful to avoid hard-coding database connection
   information into simple client appl