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Sequence (Oracle - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 5.3.28</font></EM>
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com.sleepycat.db</FONT>
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Class Sequence</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.sleepycat.db.Sequence</B>
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<DT><PRE>public class <B>Sequence</B><DT>extends <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
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<P>
A Sequence handle is used to manipulate a sequence record in a database.
Sequence handles are opened using the <A HREF="../../../com/sleepycat/db/Database.html#openSequence(com.sleepycat.db.Transaction, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.SequenceConfig)"><CODE>Database.openSequence</CODE></A> method.
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/Sequence.html#close()">close</A></B>()</CODE>
<BR>
Close a sequence.</TD>
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<CODE> long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/Sequence.html#get(com.sleepycat.db.Transaction, int)">get</A></B>(<A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> txn,
int delta)</CODE>
<BR>
Return the next available element in the sequence and changes the sequence
value by <code>delta</code>.</TD>
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<CODE> <A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/Sequence.html#getDatabase()">getDatabase</A></B>()</CODE>
<BR>
Return the Database handle associated with this sequence.</TD>
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<CODE> <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/Sequence.html#getKey()">getKey</A></B>()</CODE>
<BR>
Return the DatabaseEntry used to open this sequence.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/SequenceStats.html" title="class in com.sleepycat.db">SequenceStats</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/Sequence.html#getStats(com.sleepycat.db.StatsConfig)">getStats</A></B>(<A HREF="../../../com/sleepycat/db/StatsConfig.html" title="class in com.sleepycat.db">StatsConfig</A> config)</CODE>
<BR>
Return statistical information about the sequence.</TD>
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<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Close a sequence. Any unused cached values are lost.
<p>
The sequence handle may not be used again after this method has been
called, regardless of the method's success or failure.
<p>
<p>
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if a failure occurs.</DL>
</DD>
</DL>
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<A NAME="get(com.sleepycat.db.Transaction, int)"><!-- --></A><H3>
get</H3>
<PRE>
public long <B>get</B>(<A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> txn,
int delta)
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Return the next available element in the sequence and changes the sequence
value by <code>delta</code>. The value of <code>delta</code> must be
greater than zero. If there are enough cached values in the sequence
handle then they will be returned. Otherwise the next value will be
fetched from the database and incremented (decremented) by enough to cover
the <code>delta</code> and the next batch of cached values.
<p>
The <code>txn</code> handle must be null if the sequence handle was opened
with a non-zero cache size.
<p>
For maximum concurrency, a non-zero cache size should be specified prior to
opening the sequence handle, the <code>txn</code> handle should be
<code>null</code>, and <A HREF="../../../com/sleepycat/db/SequenceConfig.html#setAutoCommitNoSync(boolean)"><CODE>SequenceConfig.setAutoCommitNoSync</CODE></A> should
be called to disable log flushes.
<p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>txn</CODE> - For a transactional database, an explicit transaction may be specified, or null
may be specified to use auto-commit. For a non-transactional database, null
must be specified.
<p><DD><CODE>delta</CODE> - the amount by which to increment or decrement the sequence
<p>
<DT><B>Returns:</B><DD>the next available element in the sequence
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="getDatabase()"><!-- --></A><H3>
getDatabase</H3>
<PRE>
public <A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A> <B>getDatabase</B>()
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Return the Database handle associated with this sequence.
<p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>The Database handle associated with this sequence.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="getKey()"><!-- --></A><H3>
getKey</H3>
<PRE>
public <A HREF="../../../com/sleepycat/db/DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</A> <B>getKey</B>()
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Return the DatabaseEntry used to open this sequence.
<p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>The DatabaseEntry used to open this sequence.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="getStats(com.sleepycat.db.StatsConfig)"><!-- --></A><H3>
getStats</H3>
<PRE>
public <A HREF="../../../com/sleepycat/db/SequenceStats.html" title="class in com.sleepycat.db">SequenceStats</A> <B>getStats</B>(<A HREF="../../../com/sleepycat/db/StatsConfig.html" title="class in com.sleepycat.db">StatsConfig</A> config)
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Return statistical information about the sequence.
<p>
In the presence of multiple threads or processes accessing an active
sequence, the information returned by this method may be out-of-date.
<p>
The getStats method cannot be transaction-protected. For this reason, it
should be called in a thread of control that has no open cursors or active
transactions.
<p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>config</CODE> - The statistics returned; if null, default statistics are returned.
<p>
<DT><B>Returns:</B><DD>Sequence statistics.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE></DL>
</DD>
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