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| <title>5. Setting the Transaction Isolation</title><base href="display"><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="manual.html" title="Apache OpenJPA 3.0 User's Guide"><link rel="up" href="ref_guide_dbsetup.html" title="Chapter 4. JDBC"><link rel="prev" href="ref_guide_dbsetup_dbsupport.html" title="4. Database Support"><link rel="next" href="ref_guide_dbsetup_sql92.html" title="6. Setting the SQL Join Syntax"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5. |
| Setting the Transaction Isolation |
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| JDBC |
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| Setting the Transaction Isolation |
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| <p> |
| OpenJPA typically retains the default transaction isolation level of the JDBC |
| driver. However, you can specify a transaction isolation level to use through |
| the <a class="link" href="ref_guide_conf_jdbc.html#openjpa.jdbc.TransactionIsolation" title="6.18. openjpa.jdbc.TransactionIsolation"><code class="literal"> |
| openjpa.jdbc.TransactionIsolation</code></a> configuration property. The |
| following is a list of standard isolation levels. Note that not all databases |
| support all isolation levels. |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> |
| <p> |
| <code class="literal">default</code>: Use the JDBC driver's default isolation level. |
| OpenJPA uses this option if you do not explicitly specify any other. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| <code class="literal">none</code>: No transaction isolation. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| <code class="literal">read-committed</code>: Dirty reads are prevented; non-repeatable |
| reads and phantom reads can occur. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| <code class="literal">read-uncommitted</code>: Dirty reads, non-repeatable reads and |
| phantom reads can occur. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| <code class="literal">repeatable-read</code>: Dirty reads and non-repeatable reads are |
| prevented; phantom reads can occur. |
| </p> |
| </li><li class="listitem"> |
| <p> |
| <code class="literal">serializable</code>: Dirty reads, non-repeatable reads, and phantom |
| reads are prevented. |
| </p> |
| </li></ul></div> |
| <div class="example" id="ref_guide_dbsetup_isoex"><p class="title"><b>Example 4.8. |
| Specifying a Transaction Isolation |
| </b></p><div class="example-contents"> |
| |
| <pre class="programlisting"> |
| <property name="openjpa.jdbc.TransactionIsolation" value="repeatable-read"/> |
| </pre> |
| </div></div><br class="example-break"> |
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| Database Support |
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| Setting the SQL Join Syntax |
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