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Yasuhiro KIMURA
446 lines
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446 lines
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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 LockMode" class="title">Class LockMode</h2>
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<ul class="inheritance">
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<li>java.lang.Object</li>
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<li>com.sleepycat.db.LockMode</li>
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<pre>public final class <span class="typeNameLabel">LockMode</span>
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extends java.lang.Object</pre>
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<div class="block">Locking modes for database operations. Locking modes are required
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parameters for operations that retrieve data or modify the database.</div>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colSecond" scope="col">Field</th>
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<th class="colLast" scope="col">Description</th>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT">DEFAULT</a></span></code></th>
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<td class="colLast">
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<div class="block">Acquire read locks for read operations and write locks for write
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operations.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEGREE_2">DEGREE_2</a></span></code></th>
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<td class="colLast">
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>
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<div class="deprecationComment">This has been replaced by <a href="#READ_COMMITTED"><code>READ_COMMITTED</code></a> to conform to ANSI
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database isolation terminology.</div>
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</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DIRTY_READ">DIRTY_READ</a></span></code></th>
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<td class="colLast">
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>
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<div class="deprecationComment">This has been replaced by <a href="#READ_UNCOMMITTED"><code>READ_UNCOMMITTED</code></a> to conform to ANSI
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database isolation terminology.</div>
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</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#IGNORE_LEASES">IGNORE_LEASES</a></span></code></th>
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<td class="colLast">
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<div class="block">Return the data item irrespective of the state of master leases.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#READ_COMMITTED">READ_COMMITTED</a></span></code></th>
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<td class="colLast">
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<div class="block">Read committed isolation provides for cursor stability but not repeatable
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reads.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>static <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#READ_UNCOMMITTED">READ_UNCOMMITTED</a></span></code></th>
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<td class="colLast">
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<div class="block">Read modified but not yet committed data.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>static <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a></code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#RMW">RMW</a></span></code></th>
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<td class="colLast">
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<div class="block">Acquire write locks instead of read locks when doing the retrieval.</div>
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</td>
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</tr>
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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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<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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<td class="colFirst"><code>java.lang.String</code></td>
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<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString--">toString</a></span>()</code></th>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h4>DEFAULT</h4>
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<pre>public static final <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> DEFAULT</pre>
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<div class="block">Acquire read locks for read operations and write locks for write
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operations.</div>
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</li>
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</ul>
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<a name="READ_UNCOMMITTED">
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<h4>READ_UNCOMMITTED</h4>
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<pre>public static final <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> READ_UNCOMMITTED</pre>
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<div class="block">Read modified but not yet committed data.</div>
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</li>
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</ul>
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<h4>READ_COMMITTED</h4>
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<pre>public static final <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> READ_COMMITTED</pre>
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<div class="block">Read committed isolation provides for cursor stability but not repeatable
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reads. Data items which have been previously read by this transaction may
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be deleted or modified by other transactions before the cursor is closed or
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the transaction completes.
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<p>
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Note that this LockMode may only be passed to <a href="Database.html" title="class in com.sleepycat.db"><code>Database</code></a> get
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methods, not to <a href="Cursor.html" title="class in com.sleepycat.db"><code>Cursor</code></a> methods. To configure a cursor for
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Read committed isolation, use <a href="CursorConfig.html#setReadCommitted-boolean-"><code>CursorConfig.setReadCommitted(boolean)</code></a>.</div>
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</li>
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</ul>
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<a name="RMW">
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</a>
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<h4>RMW</h4>
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<pre>public static final <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> RMW</pre>
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<div class="block">Acquire write locks instead of read locks when doing the retrieval.
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Setting this flag can eliminate deadlock during a read-modify-write
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cycle by acquiring the write lock during the read part of the cycle
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so that another thread of control acquiring a read lock for the same
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item, in its own read-modify-write cycle, will not result in deadlock.</div>
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</li>
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</ul>
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<a name="DIRTY_READ">
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<h4>DIRTY_READ</h4>
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<pre>@Deprecated
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public static final <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> DIRTY_READ</pre>
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<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span>
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<div class="deprecationComment">This has been replaced by <a href="#READ_UNCOMMITTED"><code>READ_UNCOMMITTED</code></a> to conform to ANSI
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database isolation terminology.</div>
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</div>
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<div class="block">Read modified but not yet committed data.
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<p></div>
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</li>
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</ul>
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<a name="DEGREE_2">
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</a>
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<h4>DEGREE_2</h4>
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<pre>@Deprecated
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public static final <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> DEGREE_2</pre>
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<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span>
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<div class="deprecationComment">This has been replaced by <a href="#READ_COMMITTED"><code>READ_COMMITTED</code></a> to conform to ANSI
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database isolation terminology.</div>
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</div>
|
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<div class="block">Read committed isolation provides for cursor stability but not repeatable
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reads. Data items which have been previously read by this transaction may
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be deleted or modified by other transactions before the cursor is closed or
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the transaction completes.
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<p>
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Note that this LockMode may only be passed to <a href="Database.html" title="class in com.sleepycat.db"><code>Database</code></a> get
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methods, not to <a href="Cursor.html" title="class in com.sleepycat.db"><code>Cursor</code></a> methods. To configure a cursor for
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Read committed isolation, use <a href="CursorConfig.html#setReadCommitted-boolean-"><code>CursorConfig.setReadCommitted(boolean)</code></a>.
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<p></div>
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</li>
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</ul>
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<a name="IGNORE_LEASES">
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</a>
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<ul class="blockListLast">
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<li class="blockList">
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<h4>IGNORE_LEASES</h4>
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<pre>public static final <a href="LockMode.html" title="class in com.sleepycat.db">LockMode</a> IGNORE_LEASES</pre>
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<div class="block">Return the data item irrespective of the state of master leases. The item
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will be returned under all conditions: if master leases are not configured,
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if the request is made to a client, if the request is made to a master with
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a valid lease, or if the request is made to a master without a valid lease.</div>
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</li>
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</ul>
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</li>
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</a>
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<h4>toString</h4>
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<pre class="methodSignature">public java.lang.String toString()</pre>
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<dl>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
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<dd><code>toString</code> in class <code>java.lang.Object</code></dd>
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</dl>
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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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