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DbLogc (Sleepycat Software, Inc. - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 4.2.52</font></EM>
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Class DbLogc</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">java.lang.Object</A>
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+--<B>com.sleepycat.db.DbLogc</B>
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<DT>public class <B>DbLogc</B><DT>extends <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A></DL>
<P>
The DbLogc object is the handle for a cursor into the log files, supporting sequential access to the records stored in log files. The handle is not free-threaded. Once the <A HREF="../../../com/sleepycat/db/DbLogc.html#close(int)"><CODE>DbLogc.close</CODE></A> method is called, the handle may not be accessed again, regardless of that method's return.</p>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/DbLogc.html#close(int)">close</A></B>(int flags)</CODE>
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The DbLogc.close method discards the log cursor.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/DbLogc.html#get(com.sleepycat.db.DbLsn, com.sleepycat.db.Dbt, int)">get</A></B>(<A HREF="../../../com/sleepycat/db/DbLsn.html">DbLsn</A> lsn,
<A HREF="../../../com/sleepycat/db/Dbt.html">Dbt</A> data,
int flags)</CODE>
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The DbLogc.get method returns records from the log.</TD>
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<TD><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html">Object</A></B></TD>
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<A NAME="close(int)"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>(int flags)
throws <A HREF="../../../com/sleepycat/db/DbException.html">DbException</A></PRE>
<DL>
<DD>The DbLogc.close method discards the log cursor. After DbLogc.close has been called, regardless of its return, the cursor handle may not be used again.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>flags</CODE> - currently unused, and must be set to 0.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DbException.html">DbException</A></CODE>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/IllegalArgumentException.html">IllegalArgumentException</A></CODE> - The DbLogc.close method will fail and throw a IllegalArgumentException exception if the cursor was previously closed; or if an invalid flag value or parameter was specified.</DL>
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<A NAME="get(com.sleepycat.db.DbLsn, com.sleepycat.db.Dbt, int)"><!-- --></A><H3>
get</H3>
<PRE>
public int <B>get</B>(<A HREF="../../../com/sleepycat/db/DbLsn.html">DbLsn</A> lsn,
<A HREF="../../../com/sleepycat/db/Dbt.html">Dbt</A> data,
int flags)
throws <A HREF="../../../com/sleepycat/db/DbException.html">DbException</A></PRE>
<DL>
<DD>The DbLogc.get method returns records from the log.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - 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="../../../com/sleepycat/db/Dbt.html"><CODE>Dbt</CODE></A> for a description of other fields in the <b>data</b> structure. The <A HREF="../../../com/sleepycat/db/Db.html#DB_DBT_MALLOC"><CODE>Db.DB_DBT_MALLOC</CODE></A>, <A HREF="../../../com/sleepycat/db/Db.html#DB_DBT_REALLOC"><CODE>Db.DB_DBT_REALLOC</CODE></A> and <A HREF="../../../com/sleepycat/db/Db.html#DB_DBT_USERMEM"><CODE>Db.DB_DBT_USERMEM</CODE></A> flags may be specified for any <A HREF="../../../com/sleepycat/db/Dbt.html"><CODE>Dbt</CODE></A> used for data retrieval.<DD><CODE>flags</CODE> - must be set to one of the following values: <ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_CURRENT"><CODE>Db.DB_CURRENT</CODE></A><p>Return the log record to which the log currently refers. </li></ul><ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_FIRST"><CODE>Db.DB_FIRST</CODE></A><p>The first record from any of the log files found in the log directory is returned in the <b>data</b> parameter. overwritten with the <A HREF="../../../com/sleepycat/db/DbLsn.html"><CODE>DbLsn</CODE></A> of the record returned. </li></ul><ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_LAST"><CODE>Db.DB_LAST</CODE></A><p>The last record in the log is returned in the <b>data</b> parameter. overwritten with the <A HREF="../../../com/sleepycat/db/DbLsn.html"><CODE>DbLsn</CODE></A> of the record returned. </li></ul><ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_NEXT"><CODE>Db.DB_NEXT</CODE></A><p>The current log position is advanced to the next record in the log, and that record is returned in the <b>data</b> parameter. overwritten with the <A HREF="../../../com/sleepycat/db/DbLsn.html"><CODE>DbLsn</CODE></A> of the record returned. <p>If the cursor has not been initialized via DB_FIRST, DB_LAST, DB_SET, DB_NEXT, or DB_PREV, DbLogc.get will return the first record in the log.</p> </li></ul><ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_PREV"><CODE>Db.DB_PREV</CODE></A><p>The current log position is advanced to the previous record in the log, and that record is returned in the <b>data</b> parameter. overwritten with the <A HREF="../../../com/sleepycat/db/DbLsn.html"><CODE>DbLsn</CODE></A> of the record returned. <p>If the cursor has not been initialized via DB_FIRST, DB_LAST, DB_SET, DB_NEXT, or DB_PREV, DbLogc.get will return the last record in the log.</p> </li></ul><ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_SET"><CODE>Db.DB_SET</CODE></A><p>Retrieve the record specified by the <b>lsn</b> parameter. </li></ul><DD><CODE>lsn</CODE> - When the <b>flag</b> parameter is set to Db.DB_CURRENT, Db.DB_FIRST, Db.DB_LAST, Db.DB_NEXT or Db.DB_PREV, the <b>lsn</b> parameter is overwritten with the <A HREF="../../../com/sleepycat/db/DbLsn.html"><CODE>DbLsn</CODE></A> value of the record retrieved. When <b>flag</b> is set to Db.DB_SET, the <b>lsn</b> parameter is the <A HREF="../../../com/sleepycat/db/DbLsn.html"><CODE>DbLsn</CODE></A> value of the record to be retrieved.
<DT><B>Returns:</B><DD>Unless otherwise specified, the DbLogc.get method throws an exception that encapsulates a non-zero error value on failure. </p> <ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_NOTFOUND"><CODE>DB_NOTFOUND</CODE></A><p>The DbLogc.get method will return <a href="../../../../ref/program/errorret.html#DB_NOTFOUND"><code>Db.DB_NOTFOUND</code></a> if <code>Db.DB_FIRST</code> is set and the log is empty. </li></ul></p> <ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_NOTFOUND"><CODE>DB_NOTFOUND</CODE></A><p>The DbLogc.get method will return <a href="../../../../ref/program/errorret.html#DB_NOTFOUND"><code>Db.DB_NOTFOUND</code></a> if <code>Db.DB_LAST</code> is set and the log is empty. </li></ul></p> <ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_NOTFOUND"><CODE>DB_NOTFOUND</CODE></A><p>The DbLogc.get method will return <a href="../../../../ref/program/errorret.html#DB_NOTFOUND"><code>Db.DB_NOTFOUND</code></a> if <code>Db.DB_NEXT</code> is set and the last log record has already been returned or the log is empty. </li></ul></p> <ul><li><A HREF="../../../com/sleepycat/db/Db.html#DB_NOTFOUND"><CODE>DB_NOTFOUND</CODE></A><p>The DbLogc.get method will return <a href="../../../../ref/program/errorret.html#DB_NOTFOUND"><code>Db.DB_NOTFOUND</code></a> if <code>Db.DB_PREV</code> is set and the first log record has already been returned or the log is empty. </li></ul></p>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DbException.html">DbException</A></CODE>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/IllegalArgumentException.html">IllegalArgumentException</A></CODE> - The DbLogc.get method will fail and throw a IllegalArgumentException exception if the Db.DB_CURRENT flag was set and the log cursor has not yet been initialized; the Db.DB_CURRENT, Db.DB_NEXT, or Db.DB_PREV flags were set and the log was opened with the DB_THREAD flag set; the Db.DB_SET flag was set and the specified log sequence number does not appear in the log; or if an invalid flag value or parameter was specified.</DL>
</DD>
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