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Yasuhiro KIMURA
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<div class="aboutLanguage"><b>Berkeley DB</b><br><font size="-1"> version 18.1.40</font></div>
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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">com.sleepycat.db</a></div>
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<h2 title="Class Sequence" class="title">Class Sequence</h2>
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<ul class="inheritance">
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<li>java.lang.Object</li>
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<ul class="inheritance">
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<li>com.sleepycat.db.Sequence</li>
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<pre>public class <span class="typeNameLabel">Sequence</span>
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extends java.lang.Object</pre>
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<div class="block">A Sequence handle is used to manipulate a sequence record in a database.
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Sequence handles are opened using the <a href="Database.html#openSequence-com.sleepycat.db.Transaction-com.sleepycat.db.DatabaseEntry-com.sleepycat.db.SequenceConfig-"><code>Database.openSequence</code></a> method.</div>
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<h3>Method Summary</h3>
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<table class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colSecond" scope="col">Method</th>
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<th class="colLast" scope="col">Description</th>
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</tr>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#close--">close</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Close a sequence.</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>long</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#get-com.sleepycat.db.Transaction-int-">get</a></span>​(<a href="Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn,
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int delta)</code></th>
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<td class="colLast">
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<div class="block">Return the next available element in the sequence and changes the sequence
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value by <code>delta</code>.</div>
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</td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code><a href="Database.html" title="class in com.sleepycat.db">Database</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDatabase--">getDatabase</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return the Database handle associated with this sequence.</div>
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</td>
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</tr>
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<tr id="i3" class="rowColor">
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<td class="colFirst"><code><a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getKey--">getKey</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Return the DatabaseEntry used to open this sequence.</div>
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</td>
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</tr>
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<tr id="i4" class="altColor">
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<td class="colFirst"><code><a href="SequenceStats.html" title="class in com.sleepycat.db">SequenceStats</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getStats-com.sleepycat.db.StatsConfig-">getStats</a></span>​(<a href="StatsConfig.html" title="class in com.sleepycat.db">StatsConfig</a> config)</code></th>
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<td class="colLast">
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<div class="block">Return statistical information about the sequence.</div>
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</td>
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</tr>
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<tr id="i5" class="rowColor">
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<td class="colFirst"><code>int</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#printStats-com.sleepycat.db.StatsConfig-">printStats</a></span>​(<a href="StatsConfig.html" title="class in com.sleepycat.db">StatsConfig</a> config)</code></th>
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<td class="colLast">
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<div class="block">Print statistical information about the sequence to a specified output
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channel (see the setMsgfile() method for more information), or passed to an
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application callback function (see the setMsgcall() method for more
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information).</div>
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</td>
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</tr>
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</table>
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</a>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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</ul>
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<!-- ============ METHOD DETAIL ========== -->
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<h3>Method Detail</h3>
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<a name="close--">
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<h4>close</h4>
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<pre class="methodSignature">public void close()
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throws <a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre>
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<div class="block">Close a sequence. Any unused cached values are lost.
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<p>
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The sequence handle may not be used again after this method has been
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called, regardless of the method's success or failure.
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<p></div>
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<dl>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - if a failure occurs.</dd>
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</dl>
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</li>
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</ul>
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<a name="get-com.sleepycat.db.Transaction-int-">
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<h4>get</h4>
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<pre class="methodSignature">public long get​(<a href="Transaction.html" title="class in com.sleepycat.db">Transaction</a> txn,
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int delta)
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throws <a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre>
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<div class="block">Return the next available element in the sequence and changes the sequence
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value by <code>delta</code>. The value of <code>delta</code> must be
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greater than zero. If there are enough cached values in the sequence
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handle then they will be returned. Otherwise the next value will be
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fetched from the database and incremented (decremented) by enough to cover
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the <code>delta</code> and the next batch of cached values.
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<p>
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The <code>txn</code> handle must be null if the sequence handle was opened
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with a non-zero cache size.
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<p>
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For maximum concurrency, a non-zero cache size should be specified prior to
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opening the sequence handle, the <code>txn</code> handle should be
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<code>null</code>, and <a href="SequenceConfig.html#setAutoCommitNoSync-boolean-"><code>SequenceConfig.setAutoCommitNoSync</code></a> should
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be called to disable log flushes.
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<p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>txn</code> - For a transactional database, an explicit transaction may be specified, or null
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may be specified to use auto-commit. For a non-transactional database, null
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must be specified.
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<p></dd>
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<dd><code>delta</code> - the amount by which to increment or decrement the sequence
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<p></dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the next available element in the sequence</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - if a failure occurs.</dd>
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</dl>
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</li>
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</ul>
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<a name="getDatabase--">
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<h4>getDatabase</h4>
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<pre class="methodSignature">public <a href="Database.html" title="class in com.sleepycat.db">Database</a> getDatabase()
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throws <a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre>
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<div class="block">Return the Database handle associated with this sequence.
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<p></div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>The Database handle associated with this sequence.</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - if a failure occurs.</dd>
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</dl>
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</li>
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</ul>
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<a name="getKey--">
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<h4>getKey</h4>
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<pre class="methodSignature">public <a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> getKey()
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throws <a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre>
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<div class="block">Return the DatabaseEntry used to open this sequence.
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<p></div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>The DatabaseEntry used to open this sequence.</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - if a failure occurs.</dd>
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</dl>
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</li>
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</ul>
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<a name="getStats-com.sleepycat.db.StatsConfig-">
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</a>
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<h4>getStats</h4>
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<pre class="methodSignature">public <a href="SequenceStats.html" title="class in com.sleepycat.db">SequenceStats</a> getStats​(<a href="StatsConfig.html" title="class in com.sleepycat.db">StatsConfig</a> config)
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throws <a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre>
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<div class="block">Return statistical information about the sequence.
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<p>
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In the presence of multiple threads or processes accessing an active
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sequence, the information returned by this method may be out-of-date.
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<p>
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The getStats method cannot be transaction-protected. For this reason, it
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should be called in a thread of control that has no open cursors or active
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transactions.
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<p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>config</code> - The statistics returned; if null, default statistics are returned.
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<p></dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>Sequence statistics.</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - if a failure occurs.</dd>
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</dl>
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</li>
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</ul>
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<a name="printStats-com.sleepycat.db.StatsConfig-">
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<h4>printStats</h4>
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<pre class="methodSignature">public int printStats​(<a href="StatsConfig.html" title="class in com.sleepycat.db">StatsConfig</a> config)
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throws <a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></pre>
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<div class="block">Print statistical information about the sequence to a specified output
|
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channel (see the setMsgfile() method for more information), or passed to an
|
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application callback function (see the setMsgcall() method for more
|
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information).
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<p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>config</code> - The statistics returned; if null, default statistics are returned.
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<p></dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>A non-zero error value on failure and 0 on success.</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</a></code> - if a failure occurs.</dd>
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</dl>
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</li>
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<div class="aboutLanguage"><b>Berkeley DB</b><br><font size="-1"> version 18.1.40</font></div>
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