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| <title>3. Extension to Criteria API</title><base href="display"><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"><link rel="home" href="manual.html" title="Apache OpenJPA 2.3 User's Guide"><link rel="up" href="jpa_overview_criteria.html" title="Chapter 11. JPA Criteria"><link rel="prev" href="ch13s02.html" title="2. Executing a CriteriaQuery"><link rel="next" href="ch13s04.html" title="4. Generation of Canonical MetaModel classes"></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">3. Extension to Criteria API</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch13s02.html">Prev</a> </td><th width="60%" align="center">Chapter 11. |
| JPA Criteria |
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| <p> |
| Criteria API has provided an alternative means to string-based JPQL to |
| execute a query. However, JPA 2.0 specification has not explicitly specified |
| any equivalence between a dynamically constructed CriteriaQuery and |
| a JPQL string. OpenJPA provides a mechanism to convert a CriteriaQuery to |
| an equivalent JPQL query string via the extended OpenJPACriteriaQuery API. |
| </p><pre class="programlisting"> |
| public interface OpenJPACriteriaQuery extends CriteriaQuery { |
| /** |
| * Gets equivalent JPQL String for the given CriteriaQuery. |
| */ |
| public String toCQL(); |
| } |
| </pre><p> |
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