<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <HTML ><HEAD ><TITLE >Example Programs</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Pgtcl Reference Manual" HREF="index.html"><LINK REL="PREVIOUS" TITLE="pg_lo_export" HREF="pg-lo-export.html"><LINK REL="NEXT" TITLE="Example - Connect and query with pg_execute" HREF="pgtcl-example-cnq-execute.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META NAME="creation" CONTENT="2004-11-09T00:53:06"></HEAD ><BODY CLASS="CHAPTER" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Pgtcl Reference Manual: The PostgreSQL Tcl Interface</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="pg-lo-export.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="pgtcl-example-cnq-execute.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="PGTCL-EXAMPLES" ></A >Chapter 5. Example Programs</H1 ><BLOCKQUOTE CLASS="ABSTRACT" ><DIV CLASS="ABSTRACT" ><P ></P ><A NAME="AEN2592" ></A ><P >This chapter contains several examples of <SPAN CLASS="APPLICATION" >pgtcl</SPAN >. Most of these are not self-contained programs, and in many cases error checking has been omitted for clarity. </P ><P ></P ></DIV ></BLOCKQUOTE ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="PGTCL-EXAMPLE-CNQ-EXEC" >5.1. Example - Connect and query with pg_exec</A ></H1 ><P >This example shows how to connect to the database and get the server version string using <A HREF="pg-exec.html" >pg_exec</A >.</P ><P >Note that <TT CLASS="LITERAL" >pg_result ... -getTuple</TT > always returns a Tcl list of values, even if only a single column of data is produced by the query. To get the first (or only) column value, you must use <CODE CLASS="FUNCTION" >lindex</CODE >.</P ><DIV CLASS="EXAMPLE" ><A NAME="PGTCL-EXAMPLE-CNQ-EXEC-CODE" ></A ><P ><B >Example 5-1. Connect to the database and get its version with pg_exec</B ></P ><PRE CLASS="PROGRAMLISTING" >set conn [pg_connect -conninfo "host=server.example.com dbname=template1 user=guest password=secret"] set result [pg_exec $conn "SELECT version()"] set value [lindex [pg_result $result -getTuple 0] 0] pg_result $result -clear puts "Server version is: $value" pg_disconnect $conn</PRE ></DIV ></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="pg-lo-export.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="pgtcl-example-cnq-execute.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >pg_lo_export</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Example - Connect and query with pg_execute</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
