49 lines
2.1 KiB
HTML
49 lines
2.1 KiB
HTML
<!--$Id: db_join.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
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<!--$Id: db_join.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
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<!--Copyright (c) 1997,2008 Oracle. All rights reserved.-->
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<!--See the file LICENSE for redistribution information.-->
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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,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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<table width="100%"><tr valign=top>
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<td>
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<b><i>db</i> <b>join</b></b>
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</td>
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<td align=right>
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<a href="../api_tcl/api_tcl.html"><img src="../images/api.gif" alt="API"></a>
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<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
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</tr></table>
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<hr size=1 noshade>
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<tt>
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<b><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></b>
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<b>Description(db join)</b>
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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 (for example,
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db0.c0 and db0.c1). It is through this Tcl command that the script
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accesses the cursor methods.</p>
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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.</p>
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<p>See <a href="../ref/am/join.html">Equality join</a> for more information on
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the underlying requirements for joining.</p>
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<p>In a transaction-protected environment, all the cursors listed must have
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been created within the same transaction.</p>
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<p>In the case of error, a Tcl error is thrown.</p>
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</tt>
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<table width="100%"><tr><td><br></td><td align=right>
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<a href="../api_tcl/api_tcl.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>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
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</body>
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</html>
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