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49 lines
2.1 KiB
HTML
49 lines
2.1 KiB
HTML
<!--$Id: db_join.so,v 11.16 2000/12/04 18:05:39 bostic Exp $-->
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<!--$Id: m4.tcl,v 11.17 2000/04/24 17:31:11 sue 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: db join</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>
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<h1><i>db</i> <b>join</b></h1>
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</td>
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<td width="1%">
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<a href="../api_tcl/tcl_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>db join
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<i>db.cX</i>
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<i>db.cY</i>
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<i>db.cZ</i>
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...
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</pre></h3>
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<h1>Description</h1>
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<p>The <i>db</i> <b>join</b> command joins the specified cursors and returns a
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cursor handle that can be used to iterate through the joined {key data}
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pairs. The returned cursor handle is bound to a Tcl command of the form
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<b>dbN.cX</b>, where X is an integer starting at 0 (e.g., db0.c0 and
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db0.c1). It is through this Tcl command that the script accesses the
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cursor methods.
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<p>The returned join cursor has limited cursor functionality and only the
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<i>dbc</i> <b>get</b> and <i>dbc</i> <b>close</b> commands will succeed.
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<p>See <a href="../ref/am/join.html">Logical join</a> for more information on
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the underlying requirements for joining.
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<p>In a transaction protected environment, all of the cursors listed must
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have been created within the same transaction.
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<p>In the case of error, a Tcl error is thrown.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_tcl/tcl_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></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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