<!--$Id: log_put.html,v 1.1.1.1 2003/02/15 04:55:53 zarzycki Exp $--> <!--Copyright 1997-2002 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv.log_put</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h1>DbEnv.log_put</h1> </td> <td align=right> <a href="../api_java/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> import com.sleepycat.db.*; <p> public void log_put(DbLsn lsn, Dbt data, int flags) throws DbException; </pre></h3> <h1>Description</h1> <p>The DbEnv.log_put method appends records to the log. The <a href="../api_java/lsn_class.html">DbLsn</a> of the put record is returned in the <b>lsn</b> argument. The <b>flags</b> argument may be set to one of the following values: <p><dl compact> <p><dt><a name="Db.DB_FLUSH">Db.DB_FLUSH</a><dd>The log is forced to disk after this record is written, guaranteeing that all records with <a href="../api_java/lsn_class.html">DbLsn</a> values less than or equal to the one being "put" are on disk before DbEnv.log_put returns. </dl> <p>The caller is responsible for providing any necessary structure to <b>data</b>. (For example, in a write-ahead logging protocol, the application must understand what part of <b>data</b> is an operation code, what part is redo information, and what part is undo information. In addition, most transaction managers will store in <b>data</b> the <a href="../api_java/lsn_class.html">DbLsn</a> of the previous log record for the same transaction, to support chaining back through the transaction's log records during undo.) <p>The DbEnv.log_put method throws an exception that encapsulates a non-zero error value on failure. <h1>Errors</h1> <p>The <a href="../api_java/log_flush.html">DbEnv.log_flush</a> method may fail and throw an exception encapsulating a non-zero error for the following conditions: <p><dl compact> <p><dt>EINVAL<dd>An invalid flag value or parameter was specified. <p>The record to be logged is larger than the maximum log record. </dl> <p>The DbEnv.log_put method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv.log_put method may fail and throw a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls will fail in the same way. <h1>Class</h1> <a href="../api_java/env_class.html">DbEnv</a>, <a href="../api_java/logc_class.html">DbLogc</a>, <a href="../api_java/lsn_class.html">DbLsn</a> <h1>See Also</h1> <a href="../api_java/log_list.html">Logging Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../api_java/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> </body> </html>