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<!--$Id: using.so,v 11.6 2000/03/18 21:43:17 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB Reference Guide: Using Berkeley DB with Tcl</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Tcl</dl></h3></td>
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<td width="1%"><a href="../../ref/tcl/intro.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/tcl/program.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p>
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<h1 align=center>Using Berkeley DB with Tcl</h1>
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<p>All commands in the Berkeley DB Tcl interface are of the form:
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<p><blockquote><pre>command_handle operation options</pre></blockquote>
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<p>The <i>command handle</i> is <b>berkdb</b> or one of the additional
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commands that may be created. The <i>operation</i> is what you want
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to do to that handle and the <i>options</i> apply to the operation.
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Commands that get created on behalf of the application have their own sets
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of operations. Generally any calls in DB that result in new object
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handles will translate into a new command handle in Tcl. Then the user
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can access the operations of the handle via the new Tcl command handle.
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<p>Newly created commands are named with an abbreviated form of their objects
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followed by a number. Some created commands are subcommands of other
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created commands and will be the first command, followed by a period, '.'
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followed by the new subcommand. For example, suppose you have a database
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already existing called my_data.db. The following example shows the
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commands created when you open the database, and when you open a cursor:
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<p><blockquote><pre># 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></blockquote>
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<p>All commands in the library support a special option <b>-?</b> that will
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list the correct operations for a command or the correct options.
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<p>A list of commands and operations can be found in the
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<a href="../../api_tcl/tcl_index.html">Tcl Interface</a> documentation.
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<table><tr><td><br></td><td width="1%"><a href="../../ref/tcl/intro.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/tcl/program.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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</html>
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