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Yasuhiro KIMURA
471 lines
19 KiB
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471 lines
19 KiB
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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 JoinCursor" class="title">Class JoinCursor</h2>
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</div>
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<div class="contentContainer">
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<ul class="inheritance">
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<li>java.lang.Object</li>
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<li>
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<ul class="inheritance">
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<li>com.sleepycat.db.JoinCursor</li>
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</ul>
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</li>
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<div class="description">
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<hr>
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<pre>public class <span class="typeNameLabel">JoinCursor</span>
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extends java.lang.Object</pre>
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<div class="block">A specialized join cursor for use in performing equality or natural joins on
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secondary indices.
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<p>
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A join cursor is returned when calling <a href="Database.html#join-com.sleepycat.db.Cursor:A-com.sleepycat.db.JoinConfig-"><code>Database.join</code></a>.
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<p>
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To open a join cursor using two secondary cursors:
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<pre>
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Transaction txn = ...
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Database primaryDb = ...
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SecondaryDatabase secondaryDb1 = ...
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SecondaryDatabase secondaryDb2 = ...
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SecondaryCursor cursor1 = null;
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SecondaryCursor cursor2 = null;
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JoinCursor joinCursor = null;
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try {
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DatabaseEntry key = new DatabaseEntry();
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DatabaseEntry data = new DatabaseEntry();
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cursor1 = secondaryDb1.openSecondaryCursor(txn, null);
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cursor2 = secondaryDb2.openSecondaryCursor(txn, null);
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key.setData(...); // initialize key for secondary index 1
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OperationStatus status1 =
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cursor1.getSearchKey(key, data, LockMode.DEFAULT);
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key.setData(...); // initialize key for secondary index 2
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OperationStatus status2 =
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cursor2.getSearchKey(key, data, LockMode.DEFAULT);
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if (status1 == OperationStatus.SUCCESS &&
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status2 == OperationStatus.SUCCESS) {
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SecondaryCursor[] cursors = {cursor1, cursor2};
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joinCursor = primaryDb.join(cursors, null);
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while (true) {
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OperationStatus joinStatus = joinCursor.getNext(key, data,
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LockMode.DEFAULT);
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if (joinStatus == OperationStatus.SUCCESS) {
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// Do something with the key and data.
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} else {
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break;
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}
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}
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}
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} finally {
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if (cursor1 != null) {
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cursor1.close();
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}
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if (cursor2 != null) {
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cursor2.close();
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}
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if (joinCursor != null) {
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joinCursor.close();
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}
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}
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</pre></div>
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</li>
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</ul>
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</div>
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<div class="summary">
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<!-- ========== METHOD SUMMARY =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="method.summary">
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</a>
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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">Closes the cursors that have been opened by this join cursor.</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><a href="JoinConfig.html" title="class in com.sleepycat.db">JoinConfig</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getConfig--">getConfig</a></span>()</code></th>
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<td class="colLast">
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<div class="block">Returns this object's configuration.</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">Returns the primary database handle associated with this cursor.</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="OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getNext-com.sleepycat.db.DatabaseEntry-com.sleepycat.db.DatabaseEntry-com.sleepycat.db.LockMode-">getNext</a></span>​(<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> key,
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<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> data,
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<a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> lockMode)</code></th>
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<td class="colLast">
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<div class="block">Returns the next primary key and data resulting from the join operation.</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="OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getNext-com.sleepycat.db.DatabaseEntry-com.sleepycat.db.LockMode-">getNext</a></span>​(<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> key,
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<a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> lockMode)</code></th>
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<td class="colLast">
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<div class="block">Returns the next primary key resulting from the join operation.</div>
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</td>
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</tr>
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</table>
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<ul class="blockList">
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<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
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<!-- -->
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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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</li>
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</ul>
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</li>
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</ul>
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</div>
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<div class="details">
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<ul class="blockList">
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<li class="blockList">
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<!-- ============ METHOD DETAIL ========== -->
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<ul class="blockList">
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<li class="blockList"><a name="method.detail">
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<!-- -->
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</a>
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<h3>Method Detail</h3>
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<a name="close--">
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<!-- -->
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</a>
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<ul class="blockList">
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<li class="blockList">
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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">Closes the cursors that have been opened by this join cursor.
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<p>
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The cursors passed to <a href="Database.html#join-com.sleepycat.db.Cursor:A-com.sleepycat.db.JoinConfig-"><code>Database.join</code></a> are not closed
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by this method, and should be closed by the caller.
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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="getDatabase--">
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<!-- -->
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</a>
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<ul class="blockList">
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<li class="blockList">
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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()</pre>
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<div class="block">Returns the primary database handle associated with this cursor.
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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 primary database handle associated with this cursor.</dd>
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</dl>
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</li>
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</ul>
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<a name="getConfig--">
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<!-- -->
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</a>
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<ul class="blockList">
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<li class="blockList">
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<h4>getConfig</h4>
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<pre class="methodSignature">public <a href="JoinConfig.html" title="class in com.sleepycat.db">JoinConfig</a> getConfig()</pre>
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<div class="block">Returns this object's configuration.
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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>this object's configuration.</dd>
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</dl>
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</li>
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</ul>
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<a name="getNext-com.sleepycat.db.DatabaseEntry-com.sleepycat.db.LockMode-">
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<!-- -->
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</a>
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<ul class="blockList">
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<li class="blockList">
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<h4>getNext</h4>
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<pre class="methodSignature">public <a href="OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</a> getNext​(<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> key,
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<a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> lockMode)
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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">Returns the next primary key resulting from the join operation.
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<p>
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An entry is returned by the join cursor for each primary key/data pair having
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all secondary key values that were specified using the array of secondary
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cursors passed to <a href="Database.html#join-com.sleepycat.db.Cursor:A-com.sleepycat.db.JoinConfig-"><code>Database.join</code></a>.
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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>key</code> - the primary key
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returned as output. Its byte array does not need to be initialized by the
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caller.
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<p></dd>
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<dd><code>lockMode</code> - the locking attributes; if null, default attributes are used.
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<p></dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd><a href="OperationStatus.html#NOTFOUND"><code>OperationStatus.NOTFOUND</code></a> if no matching key/data pair is
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found; <a href="OperationStatus.html#KEYEMPTY"><code>OperationStatus.KEYEMPTY</code></a> if the database is a Queue or Recno database and the specified key exists, but was never explicitly created by the application or was later deleted; otherwise, <a href="OperationStatus.html#SUCCESS"><code>OperationStatus.SUCCESS</code></a>.
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<p></dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code>java.lang.NullPointerException</code> - if a DatabaseEntry parameter is null or
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does not contain a required non-null byte array.
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<p></dd>
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<dd><code><a href="DeadlockException.html" title="class in com.sleepycat.db">DeadlockException</a></code> - if the operation was selected to resolve a
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deadlock.
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<p></dd>
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<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter was specified.
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<p></dd>
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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>
|
|
</li>
|
|
</ul>
|
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<a name="getNext-com.sleepycat.db.DatabaseEntry-com.sleepycat.db.DatabaseEntry-com.sleepycat.db.LockMode-">
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<!-- -->
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</a>
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<ul class="blockListLast">
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<li class="blockList">
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<h4>getNext</h4>
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<pre class="methodSignature">public <a href="OperationStatus.html" title="class in com.sleepycat.db">OperationStatus</a> getNext​(<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> key,
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<a href="DatabaseEntry.html" title="class in com.sleepycat.db">DatabaseEntry</a> data,
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<a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> lockMode)
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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">Returns the next primary key and data resulting from the join operation.
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<p>
|
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An entry is returned by the join cursor for each primary key/data pair having
|
|
all secondary key values that were specified using the array of secondary
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cursors passed to <a href="Database.html#join-com.sleepycat.db.Cursor:A-com.sleepycat.db.JoinConfig-"><code>Database.join</code></a>.
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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>key</code> - the primary key
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returned as output. Its byte array does not need to be initialized by the
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caller.
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<p></dd>
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<dd><code>data</code> - the primary data
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returned as output. Its byte array does not need to be initialized by the
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caller.
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<p></dd>
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<dd><code>lockMode</code> - the locking attributes; if null, default attributes are used.
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<p></dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd><a href="OperationStatus.html#NOTFOUND"><code>OperationStatus.NOTFOUND</code></a> if no matching key/data pair is
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found; <a href="OperationStatus.html#KEYEMPTY"><code>OperationStatus.KEYEMPTY</code></a> if the database is a Queue or Recno database and the specified key exists, but was never explicitly created by the application or was later deleted; otherwise, <a href="OperationStatus.html#SUCCESS"><code>OperationStatus.SUCCESS</code></a>.
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<p></dd>
|
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code>java.lang.NullPointerException</code> - if a DatabaseEntry parameter is null or
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does not contain a required non-null byte array.
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<p></dd>
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<dd><code><a href="DeadlockException.html" title="class in com.sleepycat.db">DeadlockException</a></code> - if the operation was selected to resolve a
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deadlock.
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<p></dd>
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<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter was specified.
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<p></dd>
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