53 lines
2.4 KiB
HTML
53 lines
2.4 KiB
HTML
<!--$Id: txn_class.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_TXN</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>DB_TXN</b>
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</td>
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<td align=right>
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<a href="../api_c/api_core.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>
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#include <db.h>
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<p>
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typedef struct __db_txn DB_TXN;
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DB_TXN</b>
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<p>The DB_TXN object is the handle for a transaction. Methods of
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the DB_TXN handle are used to configure, abort and commit the
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transaction. DB_TXN handles are provided to <a href="../api_c/db_class.html">DB</a> methods
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in order to transactionally protect those database operations.</p>
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<p>DB_TXN handles are not free-threaded; transactions handles may
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be used by multiple threads, but only serially, that is, the application
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must serialize access to the DB_TXN handle. Once the
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<a href="../api_c/txn_abort.html">DB_TXN->abort</a> or <a href="../api_c/txn_commit.html">DB_TXN->commit</a> methods are called, the handle may
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not be accessed again, regardless of the method's return. In addition,
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parent transactions may not issue any Berkeley DB operations while they have
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active child transactions (child transactions that have not yet been
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committed or aborted) except for <a href="../api_c/txn_begin.html">DB_ENV->txn_begin</a>, <a href="../api_c/txn_abort.html">DB_TXN->abort</a>
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and <a href="../api_c/txn_commit.html">DB_TXN->commit</a>.</p>
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<hr size=1 noshade>
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<br><b>Class</b>
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<a href="../api_c/env_class.html">DB_ENV</a>, DB_TXN
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<br><b>See Also</b>
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<a href="../api_c/txn_list.html">Transaction Subsystem and Related Methods</a>
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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_c/api_core.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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