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+<!--Id: logc_get.so,v 10.30 2001/09/29 15:48:08 dda Exp -->
+<!--Copyright 1997-2001 by Sleepycat Software, Inc.-->
+<!--All rights reserved.-->
+<html>
+<head>
+<title>Berkeley DB: DbLogc.logc_get</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>DbLogc.logc_get</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 int get(DbLsn lsn, Dbt data, int flags)
+	throws DbException;
+</pre></h3>
+<h1>Description</h1>
+<p>The DbLogc.logc_get method retrieve records from the log according to the
+<b>lsn</b> and <b>flags</b> arguments.
+<p>The data field of the <b>data</b> structure is set to the record
+retrieved, and the size field indicates the number of bytes in the
+record.  See <a href="../api_java/dbt_class.html">Dbt</a> for a description of other fields in the
+<b>data</b> structure.  The <a href="../api_java/dbt_class.html#DB_DBT_MALLOC">Db.DB_DBT_MALLOC</a>,
+<a href="../api_java/dbt_class.html#DB_DBT_REALLOC">Db.DB_DBT_REALLOC</a> and <a href="../api_java/dbt_class.html#DB_DBT_USERMEM">Db.DB_DBT_USERMEM</a> flags may be specified
+for any <a href="../api_java/dbt_class.html">Dbt</a> used for data retrieval.
+<p>The <b>flags</b> value must be set to one of the following values:
+<p><dl compact>
+<p><dt><a name="Db.DB_CHECKPOINT">Db.DB_CHECKPOINT</a><dd>The last record written with the DB_CHECKPOINT flag specified to the
+<a href="../api_java/log_put.html">DbEnv.log_put</a> method is returned in the <b>data</b> argument.  The
+<b>lsn</b> argument is overwritten with the <a href="../api_java/lsn_class.html">DbLsn</a> of the record
+returned.  If no record has been previously written with the DB_CHECKPOINT
+flag specified, the first record in the log is returned.
+<p>If the log is empty, the DbLogc.logc_get method will return <a href="../ref/program/errorret.html#DB_NOTFOUND">Db.DB_NOTFOUND</a>.
+<p><dt><a name="Db.DB_FIRST">Db.DB_FIRST</a><dd>The first record from any of the log files found in the log directory
+is returned in the <b>data</b> argument.
+The <b>lsn</b> argument is overwritten with the <a href="../api_java/lsn_class.html">DbLsn</a> of the
+record returned.
+<p>If the log is empty, the DbLogc.logc_get method will return <a href="../ref/program/errorret.html#DB_NOTFOUND">Db.DB_NOTFOUND</a>.
+<p><dt><a name="Db.DB_LAST">Db.DB_LAST</a><dd>The last record in the log is returned in the <b>data</b> argument.
+The <b>lsn</b> argument is overwritten with the <a href="../api_java/lsn_class.html">DbLsn</a> of the
+record returned.
+<p>If the log is empty, the DbLogc.logc_get method will return <a href="../ref/program/errorret.html#DB_NOTFOUND">Db.DB_NOTFOUND</a>.
+<p><dt><a name="Db.DB_NEXT">Db.DB_NEXT</a>, <a name="Db.DB_PREV">Db.DB_PREV</a><dd>The current log position is advanced to the next (previous) record in
+the log, and that record is returned in the <b>data</b> argument.  The
+<b>lsn</b> argument is overwritten with the <a href="../api_java/lsn_class.html">DbLsn</a> of the record
+returned.
+<p>If the pointer has not been initialized via DB_FIRST, DB_LAST, DB_SET,
+DB_NEXT, or DB_PREV, DbLogc.logc_get will return the first (last) record
+in the log.  If the last (first) log record has already been returned
+or the log is empty, the DbLogc.logc_get method will return <a href="../ref/program/errorret.html#DB_NOTFOUND">Db.DB_NOTFOUND</a>.
+<p>If the log was opened with the DB_THREAD flag set, calls to
+DbLogc.logc_get with the DB_NEXT (DB_PREV) flag set will return
+EINVAL.
+<p><dt><a name="Db.DB_CURRENT">Db.DB_CURRENT</a><dd>Return the log record to which the log currently refers.
+<p>If the log pointer has not been initialized via DB_FIRST, DB_LAST,
+DB_SET, DB_NEXT, or DB_PREV, or if the log was opened with the DB_THREAD
+flag set, DbLogc.logc_get will return EINVAL.
+<p><dt><a name="Db.DB_SET">Db.DB_SET</a><dd>Retrieve the record specified by the <b>lsn</b> argument.  If the
+specified <a href="../api_java/lsn_class.html">DbLsn</a> is invalid (for example, it does not appear in
+the log) DbLogc.logc_get will return EINVAL.
+</dl>
+<p>Otherwise, the DbLogc.logc_get method throws an exception that encapsulates a non-zero error value on
+failure.
+<h1>Errors</h1>
+<p>The DbLogc.logc_get 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 DB_CURRENT flag was set and the log pointer had not yet been
+initialized.
+<p>The DB_SET flag was set and the specified log sequence number does not
+exist.
+</dl>
+<p>The DbLogc.logc_get 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 DbLogc.logc_get 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/dbenv_class.html">DbEnv</a>
+<h1>See Also</h1>
+<a href="../api_java/env_set_lg_bsize.html">DbEnv.set_lg_bsize</a>,
+<a href="../api_java/env_set_lg_dir.html">DbEnv.set_lg_dir</a>,
+<a href="../api_java/env_set_lg_max.html">DbEnv.set_lg_max</a>,
+<a href="../api_java/env_set_lg_regionmax.html">DbEnv.set_lg_regionmax</a>,
+<a href="../api_java/log_archive.html">DbEnv.log_archive</a>,
+<a href="../api_java/log_compare.html">DbEnv.log_compare</a>,
+<a href="../api_java/log_cursor.html">DbEnv.log_cursor</a>,
+<a href="../api_java/log_file.html">DbEnv.log_file</a>,
+<a href="../api_java/log_flush.html">DbEnv.log_flush</a>,
+<a href="../api_java/log_put.html">DbEnv.log_put</a>,
+<a href="../api_java/log_register.html">DbEnv.log_register</a>,
+<a href="../api_java/log_stat.html">DbEnv.log_stat</a>,
+<a href="../api_java/log_unregister.html">DbEnv.log_unregister</a>,
+<a href="../api_java/logc_close.html">DbLogc.logc_close</a>
+and
+<a href="../api_java/logc_get.html">DbLogc.logc_get</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>