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Yasuhiro KIMURA
110 lines
4.6 KiB
HTML
110 lines
4.6 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Using Berkeley DB with Tcl</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
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<link rel="up" href="tcl.html" title="Chapter 22. Berkeley DB Extensions: Tcl" />
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<link rel="prev" href="tcl.html" title="Chapter 22. Berkeley DB Extensions: Tcl" />
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<link rel="next" href="tcl_program.html" title="Tcl API programming notes" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 18.1.40</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Using Berkeley DB with Tcl</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="tcl.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 22. Berkeley DB Extensions: Tcl </th>
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<td width="20%" align="right"> <a accesskey="n" href="tcl_program.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="tcl_using"></a>Using Berkeley DB with Tcl</h2>
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</div>
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</div>
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</div>
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<p>
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All commands in the Berkeley DB Tcl interface are in the
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following form:
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</p>
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<pre class="programlisting">command_handle operation options</pre>
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<p>
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The <span class="emphasis"><em>command handle</em></span> is <span class="bold"><strong>berkdb</strong></span> or one of the additional
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commands that may be created. The
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<span class="emphasis"><em>operation</em></span> is what you want to do to
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that handle, and the <span class="emphasis"><em>options</em></span> apply to the
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operation. Commands that get created on behalf of the
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application have their own sets of operations. Generally, any
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calls in DB that result in new object handles will translate
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into a new command handle in Tcl. Then, the user can access
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the operations of the handle via the new Tcl command
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handle.
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</p>
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<p>
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Newly created commands are named with an abbreviated form of
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their objects, followed by a number. Some created commands are
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subcommands of other created commands and will be the first
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command, followed by a period (.), and then followed by the
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new subcommand. For example, suppose that you have a database
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already existing called my_data.db. The following example
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shows the commands created when you open the database and when
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you open a cursor:
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</p>
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<pre class="programlisting"># First open the database and get a database command handle
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% berkdb open my_data.db
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db0
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#Get some data from that database
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% db0 get my_key
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{{my_key my_data0}{my_key my_data1}}
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#Open a cursor in this database, get a new cursor handle
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% db0 cursor
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db0.c0
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#Get the first data from the cursor
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% db0.c0 get -first
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{{first_key first_data}}</pre>
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<p>
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All commands in the library support a special option
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<span class="bold"><strong>-?</strong></span> that will list the
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correct operations for a command or the correct
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options.
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</p>
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<p>
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A list of commands and operations can be found in the <a href="../api_reference/TCL/index.html" class="olink">Tcl API</a>
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documentation.
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</p>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="tcl.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="tcl.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="tcl_program.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Chapter 22. Berkeley DB Extensions: Tcl </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Tcl API programming notes</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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