| <!DOCTYPE HTML> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (17) on Tue May 07 14:19:41 GMT 2024 --> |
| <title>IsolationLevel (Apache Arrow ADBC Java Root POM 1.0.0-SNAPSHOT API)</title> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <meta name="dc.created" content="2024-05-07"> |
| <meta name="description" content="declaration: package: org.apache.arrow.adbc.core, enum: IsolationLevel"> |
| <meta name="generator" content="javadoc/ClassWriterImpl"> |
| <link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style"> |
| <link rel="stylesheet" type="text/css" href="../../../../../script-dir/jquery-ui.min.css" title="Style"> |
| <link rel="stylesheet" type="text/css" href="../../../../../jquery-ui.overrides.css" title="Style"> |
| <script type="text/javascript" src="../../../../../script.js"></script> |
| <script type="text/javascript" src="../../../../../script-dir/jquery-3.6.1.min.js"></script> |
| <script type="text/javascript" src="../../../../../script-dir/jquery-ui.min.js"></script> |
| </head> |
| <body class="class-declaration-page"> |
| <script type="text/javascript">var evenRowColor = "even-row-color"; |
| var oddRowColor = "odd-row-color"; |
| var tableTab = "table-tab"; |
| var activeTableTab = "active-table-tab"; |
| var pathtoroot = "../../../../../"; |
| loadScripts(document, 'script');</script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| <div class="flex-box"> |
| <header role="banner" class="flex-header"> |
| <nav role="navigation"> |
| <!-- ========= START OF TOP NAVBAR ======= --> |
| <div class="top-nav" id="navbar-top"> |
| <div class="skip-nav"><a href="#skip-navbar-top" title="Skip navigation links">Skip navigation links</a></div> |
| <ul id="navbar-top-firstrow" class="nav-list" title="Navigation"> |
| <li><a href="../../../../../index.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="nav-bar-cell1-rev">Class</li> |
| <li><a href="class-use/IsolationLevel.html">Use</a></li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../help-doc.html#class">Help</a></li> |
| </ul> |
| </div> |
| <div class="sub-nav"> |
| <div> |
| <ul class="sub-nav-list"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li><a href="#enum-constant-summary">Enum Constants</a> | </li> |
| <li>Field | </li> |
| <li><a href="#method-summary">Method</a></li> |
| </ul> |
| <ul class="sub-nav-list"> |
| <li>Detail: </li> |
| <li><a href="#enum-constant-detail">Enum Constants</a> | </li> |
| <li>Field | </li> |
| <li><a href="#method-detail">Method</a></li> |
| </ul> |
| </div> |
| <div class="nav-list-search"><label for="search-input">SEARCH:</label> |
| <input type="text" id="search-input" value="search" disabled="disabled"> |
| <input type="reset" id="reset-button" value="reset" disabled="disabled"> |
| </div> |
| </div> |
| <!-- ========= END OF TOP NAVBAR ========= --> |
| <span class="skip-nav" id="skip-navbar-top"></span></nav> |
| </header> |
| <div class="flex-content"> |
| <main role="main"> |
| <!-- ======== START OF CLASS DATA ======== --> |
| <div class="header"> |
| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.arrow.adbc.core</a></div> |
| <h1 title="Enum IsolationLevel" class="title">Enum IsolationLevel</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html" title="class or interface in java.lang" class="external-link">java.lang.Enum</a><<a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a>> |
| <div class="inheritance">org.apache.arrow.adbc.core.IsolationLevel</div> |
| </div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html" title="class or interface in java.io" class="external-link">Serializable</a></code>, <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html" title="class or interface in java.lang" class="external-link">Comparable</a><<a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a>></code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public enum </span><span class="element-name type-name-label">IsolationLevel</span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html" title="class or interface in java.lang" class="external-link">Enum</a><<a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a>></span></div> |
| <div class="block">The isolation level to use for transactions when autocommit is disabled.</div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- =========== ENUM CONSTANT SUMMARY =========== --> |
| <li> |
| <section class="constants-summary" id="enum-constant-summary"> |
| <h2>Enum Constant Summary</h2> |
| <div class="caption"><span>Enum Constants</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Enum Constant</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code><a href="#DEFAULT" class="member-name-link">DEFAULT</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">The database or driver default isolation level.</div> |
| </div> |
| <div class="col-first odd-row-color"><code><a href="#LINEARIZABLE" class="member-name-link">LINEARIZABLE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">The central distinction between serializability and linearizability is that serializability is |
| a global property; a property of an entire history of operations and transactions.</div> |
| </div> |
| <div class="col-first even-row-color"><code><a href="#READ_COMMITTED" class="member-name-link">READ_COMMITTED</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Lock-based concurrency control keeps write locks until the end of the transaction, but read |
| locks are released as soon as a SELECT is performed.</div> |
| </div> |
| <div class="col-first odd-row-color"><code><a href="#READ_UNCOMMITTED" class="member-name-link">READ_UNCOMMITTED</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">The lowest isolation level.</div> |
| </div> |
| <div class="col-first even-row-color"><code><a href="#REPEATABLE_READ" class="member-name-link">REPEATABLE_READ</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Lock-based concurrency control keeps read AND write locks (acquired on selection data) until |
| the end of the transaction.</div> |
| </div> |
| <div class="col-first odd-row-color"><code><a href="#SERIALIZABLE" class="member-name-link">SERIALIZABLE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Serializability requires read and write locks to be released only at the end of the |
| transaction.</div> |
| </div> |
| <div class="col-first even-row-color"><code><a href="#SNAPSHOT" class="member-name-link">SNAPSHOT</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">This isolation guarantees that all reads in the transaction will see a consistent snapshot of |
| the database and the transaction should only successfully commit if no updates conflict with |
| any concurrent updates made since that snapshot.</div> |
| </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#valueOf(java.lang.String)" class="member-name-link">valueOf</a><wbr>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a> name)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a>[]</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#values()" class="member-name-link">values</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Enum">Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html" title="class or interface in java.lang" class="external-link">Enum</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html#compareTo-E-" title="class or interface in java.lang" class="external-link">compareTo</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html#equals-java.lang.Object-" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html#getDeclaringClass--" title="class or interface in java.lang" class="external-link">getDeclaringClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html#hashCode--" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html#name--" title="class or interface in java.lang" class="external-link">name</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html#ordinal--" title="class or interface in java.lang" class="external-link">ordinal</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html#toString--" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html#valueOf-java.lang.Class-java.lang.String-" title="class or interface in java.lang" class="external-link">valueOf</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ ENUM CONSTANT DETAIL =========== --> |
| <li> |
| <section class="constant-details" id="enum-constant-detail"> |
| <h2>Enum Constant Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="DEFAULT"> |
| <h3>DEFAULT</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a></span> <span class="element-name">DEFAULT</span></div> |
| <div class="block">The database or driver default isolation level.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="READ_UNCOMMITTED"> |
| <h3>READ_UNCOMMITTED</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a></span> <span class="element-name">READ_UNCOMMITTED</span></div> |
| <div class="block">The lowest isolation level. Dirty reads are allowed, so one transaction may see |
| not-yet-committed changes made by others.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="READ_COMMITTED"> |
| <h3>READ_COMMITTED</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a></span> <span class="element-name">READ_COMMITTED</span></div> |
| <div class="block">Lock-based concurrency control keeps write locks until the end of the transaction, but read |
| locks are released as soon as a SELECT is performed. Non-repeatable reads can occur in this |
| isolation level. |
| |
| <p>More simply put, Read Committed is an isolation level that guarantees that any data read is |
| committed at the moment it is read. It simply restricts the reader from seeing any |
| intermediate, uncommitted, 'dirty' reads. It makes no promise whatsoever that if the |
| transaction re-issues the read, it will find the same data; data is free to change after it is |
| read.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="REPEATABLE_READ"> |
| <h3>REPEATABLE_READ</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a></span> <span class="element-name">REPEATABLE_READ</span></div> |
| <div class="block">Lock-based concurrency control keeps read AND write locks (acquired on selection data) until |
| the end of the transaction. |
| |
| <p>However, range-locks are not managed, so phantom reads can occur. Write skew is possible at |
| this isolation level in some systems.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="SNAPSHOT"> |
| <h3>SNAPSHOT</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a></span> <span class="element-name">SNAPSHOT</span></div> |
| <div class="block">This isolation guarantees that all reads in the transaction will see a consistent snapshot of |
| the database and the transaction should only successfully commit if no updates conflict with |
| any concurrent updates made since that snapshot.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="SERIALIZABLE"> |
| <h3>SERIALIZABLE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a></span> <span class="element-name">SERIALIZABLE</span></div> |
| <div class="block">Serializability requires read and write locks to be released only at the end of the |
| transaction. This includes acquiring range- locks when a select query uses a ranged WHERE |
| clause to avoid phantom reads.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="LINEARIZABLE"> |
| <h3>LINEARIZABLE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a></span> <span class="element-name">LINEARIZABLE</span></div> |
| <div class="block">The central distinction between serializability and linearizability is that serializability is |
| a global property; a property of an entire history of operations and transactions. |
| Linearizability is a local property; a property of a single operation/transaction. |
| |
| <p>Linearizability can be viewed as a special case of strict serializability where transactions |
| are restricted to consist of a single operation applied to a single object.</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="values()"> |
| <h3>values</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type"><a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a>[]</span> <span class="element-name">values</span>()</div> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="valueOf(java.lang.String)"> |
| <h3>valueOf</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type"><a href="IsolationLevel.html" title="enum in org.apache.arrow.adbc.core">IsolationLevel</a></span> <span class="element-name">valueOf</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a> name)</span></div> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt>Returns:</dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html" title="class or interface in java.lang" class="external-link">NullPointerException</a></code> - if the argument is null</dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= END OF CLASS DATA ========= --> |
| </main> |
| <footer role="contentinfo"> |
| <hr> |
| <p class="legal-copy"><small>Copyright © 2024 <a href="https://www.apache.org/">The Apache Software Foundation</a>. All rights reserved.</small></p> |
| </footer> |
| </div> |
| </div> |
| </body> |
| </html> |
