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<title>Berkeley DB Reference Guide: Using Berkeley DB with Tcl</title>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Tcl API</dl></h3></td>
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<h3 align=center>Using Berkeley DB with Tcl</h3>
<p>All commands in the Berkeley DB Tcl interface are in the following form:</p>
<blockquote><pre>command_handle operation options</pre></blockquote>
<p>The <i>command handle</i> is <b>berkdb</b> or one of the additional
commands that may be created. The <i>operation</i> is what you want
to do to that handle, and the <i>options</i> apply to the operation.
Commands that get created on behalf of the application have their own sets
of operations. Generally, any calls in DB that result in new object
handles will translate into a new command handle in Tcl. Then, the user
can access the operations of the handle via the new Tcl command handle.</p>
<p>Newly created commands are named with an abbreviated form of their
objects, followed by a number. Some created commands are subcommands of
other created commands and will be the first command, followed by a
period (.), and then followed by the new subcommand. For example,
suppose that you have a database already existing called my_data.db.
The following example shows the commands created when you open the
database and when you open a cursor:</p>
<blockquote><pre># First open the database and get a database command handle
% berkdb open my_data.db
db0
#Get some data from that database
% db0 get my_key
{{my_key my_data0}{my_key my_data1}}
#Open a cursor in this database, get a new cursor handle
% db0 cursor
db0.c0
#Get the first data from the cursor
% db0.c0 get -first
{{first_key first_data}}</pre></blockquote>
<p>All commands in the library support a special option <b>-?</b> that will
list the correct operations for a command or the correct options.</p>
<p>A list of commands and operations can be found in the
<a href="../../api_tcl/api_tcl.html">Tcl Interface</a> documentation.</p>
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