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| <title>11. Examples</title><link rel="stylesheet" href="css/docbook.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.72.0"><link rel="start" href="manual.html" title="Apache OpenJPA User's Guide"><link rel="up" href="ref_guide_mapping.html" title="Chapter 7. Mapping"><link rel="prev" href="ref_guide_mapping_jpa_map_embedkey.html" title="10. Key Embedded Mapping"><link rel="next" href="ref_guide_mapping_limits.html" title="12. Mapping Limitations"></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">11. Examples</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ref_guide_mapping_jpa_map_embedkey.html">Prev</a> </td><th width="60%" align="center">Chapter 7. |
| Mapping |
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| Map mapping in OpenJPA uses the same principles you saw in |
| collection mapping. The example below maps the <code class="literal"> |
| Article.authors</code> map according to the diagram above. |
| </p><div class="example"><a name="ref_guide_mapping_jpa_map_stringrelmap"></a><p class="title"><b>Example 7.25. String Key, Entity Value Map Mapping</b></p><div class="example-contents"><pre class="programlisting"> |
| package org.mag.pub; |
| |
| import org.apache.openjpa.persistence.*; |
| import org.apache.openjpa.persistence.jdbc.*; |
| |
| @Entity |
| @Table(name="AUTH") |
| @DataStoreIdColumn(name="AID" columnDefinition="INTEGER64") |
| public class Author { |
| ... |
| } |
| |
| package org.mag; |
| |
| @Entity |
| @Table(name="ART") |
| public class Article { |
| @Id private long id; |
| |
| @PersistentMap |
| @ContainerTable(name="ART_AUTHS", joinColumns=@XJoinColumn(name="ART_ID")) |
| @KeyColumn(name="LNAME") |
| @ElementJoinColumn(name="AUTH_ID") |
| private Map<String,Author> authors; |
| |
| ... |
| } |
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| Mapping Limitations |
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