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tcl_program.html
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Editing: tcl.html
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>ChapterΒ 21.Β Berkeley DB Extensions: Tcl</title> <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" /> <link rel="up" href="index.html" title="Berkeley DB Programmer's Reference Guide" /> <link rel="prev" href="sequence.html" title="ChapterΒ 20.Β Sequences" /> <link rel="next" href="tcl_using.html" title="Using Berkeley DB with Tcl" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">ChapterΒ 21.Β Berkeley DB Extensions: Tcl </th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="sequence.html">Prev</a>Β </td> <th width="60%" align="center">Β </th> <td width="20%" align="right">Β <a accesskey="n" href="tcl_using.html">Next</a></td> </tr> </table> <hr /> </div> <div class="chapter" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title"><a id="tcl"></a>ChapterΒ 21.Β Berkeley DB Extensions: Tcl </h2> </div> </div> </div> <div class="toc"> <p> <b>Table of Contents</b> </p> <dl> <dt> <span class="sect1"> <a href="tcl.html#tcl_intro">Loading Berkeley DB with Tcl</a> </span> </dt> <dd> <dl> <dt> <span class="sect2"> <a href="tcl.html#idp53366464">Installing as a Tcl Package</a> </span> </dt> <dt> <span class="sect2"> <a href="tcl.html#idp53356912">Loading Berkeley DB with Tcl</a> </span> </dt> </dl> </dd> <dt> <span class="sect1"> <a href="tcl_using.html">Using Berkeley DB with Tcl</a> </span> </dt> <dt> <span class="sect1"> <a href="tcl_program.html">Tcl API programming notes</a> </span> </dt> <dt> <span class="sect1"> <a href="tcl_error.html">Tcl error handling</a> </span> </dt> <dt> <span class="sect1"> <a href="tcl_faq.html">Tcl FAQ</a> </span> </dt> </dl> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="tcl_intro"></a>Loading Berkeley DB with Tcl</h2> </div> </div> </div> <div class="toc"> <dl> <dt> <span class="sect2"> <a href="tcl.html#idp53366464">Installing as a Tcl Package</a> </span> </dt> <dt> <span class="sect2"> <a href="tcl.html#idp53356912">Loading Berkeley DB with Tcl</a> </span> </dt> </dl> </div> <p>Berkeley DB includes a dynamically loadable Tcl API, which requires that Tcl/Tk 8.5 or later already be installed on your system. You can download a copy of Tcl from the <a class="ulink" href="http://www.tcl.tk" target="_top">Tcl Developer Xchange</a> Web site.</p> <p>This document assumes that you already configured Berkeley DB for Tcl support, and you have built and installed everything where you want it to be. If you have not done so, see <a href="../installation/build_unix_conf.html" class="olink">Configuring Berkeley DB</a> or <a href="../installation/build_win_tcl.html" class="olink">Building the Tcl API</a> in the Berkeley DB Installation and Build Guide for more information.</p> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp53366464"></a>Installing as a Tcl Package</h3> </div> </div> </div> <p>Once enabled, the Berkeley DB shared library for Tcl is automatically installed as part of the standard installation process. However, if you want to be able to dynamically load it as a Tcl package into your script, there are several steps that must be performed:</p> <div class="orderedlist"> <ol type="1"> <li>Run the Tcl shell in the install directory.</li> <li>Append this directory to your auto_path variable.</li> <li>Run the pkg_mkIndex proc, giving the name of the Berkeley DB Tcl library.</li> </ol> </div> <p>For example:</p> <pre class="programlisting"># tclsh8.5 % lappend auto_path /usr/local/BerkeleyDB.5.2/lib % pkg_mkIndex /usr/local/BerkeleyDB.5.2/lib libdb_tcl-5.2.so</pre> <p>Note that your Tcl and Berkeley DB version numbers may differ from the example, and so your tclsh and library names may be different.</p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp53356912"></a>Loading Berkeley DB with Tcl</h3> </div> </div> </div> <p>The Berkeley DB package may be loaded into the user's interactive Tcl script (or wish session) via the <span class="bold"><strong>load</strong></span> command. For example:</p> <pre class="programlisting">load /usr/local/BerkeleyDB.5.2/lib/libdb_tcl-5.2.so</pre> <p>Note that your Berkeley DB version numbers may differ from the example, and so the library name may be different.</p> <p>If you installed your library to run as a Tcl package, Tcl application scripts should use the <span class="bold"><strong>package</strong></span> command to indicate to the Tcl interpreter that it needs the Berkeley DB package and where to find it. For example:</p> <pre class="programlisting">lappend auto_path "/usr/local/BerkeleyDB.5.2/lib" package require Db_tcl</pre> <p>No matter which way the library gets loaded, it creates a command named <span class="bold"><strong>berkdb</strong></span>. All the Berkeley DB functionality is accessed via this command and additional commands it creates on behalf of the application. A simple test to determine whether everything is loaded and ready is to display the library version, as follows:</p> <pre class="programlisting">berkdb version -string</pre> <p>This should return you the Berkeley DB version in a string format.</p> </div> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="sequence.html">Prev</a>Β </td> <td width="20%" align="center">Β </td> <td width="40%" align="right">Β <a accesskey="n" href="tcl_using.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">ChapterΒ 20.Β Sequences Β </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top">Β Using Berkeley DB with Tcl</td> </tr> </table> </div> </body> </html>
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