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| <title>4. Conclusion</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="jpa_overview_meta.html" title="Chapter 5. Metadata"><link rel="prev" href="jpa_overview_meta_xml.html" title="3. XML Schema"><link rel="next" href="jpa_overview_persistence.html" title="Chapter 6. Persistence"></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">4. |
| Conclusion |
| </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="jpa_overview_meta_xml.html">Prev</a> </td><th width="60%" align="center">Chapter 5. |
| Metadata |
| </th><td width="20%" align="right"> <a accesskey="n" href="jpa_overview_persistence.html">Next</a></td></tr></table><hr></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="jpa_overview_meta_complete"></a>4. |
| Conclusion |
| </h2></div></div></div><p> |
| That exhausts persistence metadata annotations. We present the class definitions |
| for our sample model below: |
| </p><div class="example"><a name="jpa_overview_meta_complete_ex"></a><p class="title"><b>Example 5.2. |
| Complete Metadata |
| </b></p><div class="example-contents"><pre class="programlisting"> |
| package org.mag; |
| |
| @Entity |
| @IdClass(Magazine.MagazineId.class) |
| public class Magazine { |
| |
| @Id private String isbn; |
| @Id private String title; |
| @Version private int version; |
| |
| private double price; // defaults to @Basic |
| private int copiesSold; // defaults to @Basic |
| |
| @OneToOne(fetch=FetchType.LAZY, |
| cascade={CascadeType.PERSIST,CascadeType.REMOVE}) |
| private Article coverArticle; |
| |
| @OneToMany(cascade={CascadeType.PERSIST,CascadeType.REMOVE}) |
| @OrderBy |
| private Collection<Article> articles; |
| |
| @ManyToOne(fetch=FetchType.LAZY, cascade=CascadeType.PERSIST) |
| private Company publisher; |
| |
| @Transient private byte[] data; |
| |
| ... |
| |
| public static class MagazineId { |
| ... |
| } |
| } |
| |
| @Entity |
| public class Article { |
| |
| @Id private long id; |
| @Version private int version; |
| |
| private String title; // defaults to @Basic |
| private byte[] content; // defaults to @Basic |
| |
| @ManyToMany(cascade=CascadeType.PERSIST) |
| @OrderBy("lastName, firstName") |
| private Collection<Author> authors; |
| |
| ... |
| } |
| |
| |
| package org.mag.pub; |
| |
| @Entity |
| public class Company { |
| |
| @Id private long id; |
| @Version private int version; |
| |
| private String name; // defaults to @Basic |
| private double revenue; // defaults to @Basic |
| private Address address; // defaults to @Embedded |
| |
| @OneToMany(mappedBy="publisher", cascade=CascadeType.PERSIST) |
| private Collection<Magazine> mags; |
| |
| @OneToMany(cascade={CascadeType.PERSIST,CascadeType.REMOVE}) |
| private Collection<Subscription> subscriptions; |
| |
| ... |
| } |
| |
| @Entity |
| public class Author { |
| |
| @Id private long id; |
| @Version private int version; |
| |
| private String firstName; // defaults to @Basic |
| private double lastName; // defaults to @Basic |
| private Address address; // defaults to @Embedded |
| |
| @ManyToMany(mappedBy="authors", cascade=CascadeType.PERSIST) |
| private Collection<Article> arts; |
| |
| ... |
| } |
| |
| @Embeddable |
| public class Address { |
| |
| private String street; // defaults to @Basic |
| private String city; // defaults to @Basic |
| private String state; // defaults to @Basic |
| private String zip; // defaults to @Basic |
| |
| ... |
| } |
| |
| |
| package org.mag.subscribe; |
| |
| @MappedSuperclass |
| public abstract class Document { |
| |
| @Id private long id; |
| @Version private int version; |
| |
| ... |
| } |
| |
| @Entity |
| public class Contract |
| extends Document { |
| |
| private String terms; // defaults to @Basic |
| |
| ... |
| } |
| |
| @Entity |
| public class Subscription { |
| |
| @Id private long id; |
| @Version private int version; |
| |
| private Date startDate; // defaults to @Basic |
| private double payment; // defaults to @Basic |
| |
| @OneToMany(cascade={CascadeType.PERSIST,CascadeType.REMOVE}) |
| @MapKey(name="num") |
| private Map<Long,LineItem> lineItems; |
| |
| ... |
| |
| @Entity |
| public static class LineItem |
| extends Contract { |
| |
| private String comments; // defaults to @Basic |
| private double price; // defaults to @Basic |
| private long num; // defaults to @Basic |
| |
| @ManyToOne |
| private Magazine magazine; |
| |
| ... |
| } |
| } |
| |
| @Entity(name="Lifetime") |
| public class LifetimeSubscription |
| extends Subscription { |
| |
| @Basic(fetch=FetchType.LAZY) |
| private boolean getEliteClub() { ... } |
| public void setEliteClub(boolean elite) { ... } |
| |
| ... |
| } |
| |
| @Entity(name="Trial") |
| public class TrialSubscription |
| extends Subscription { |
| |
| public Date getEndDate() { ... } |
| public void setEndDate(Date end) { ... } |
| |
| ... |
| } |
| </pre><p> |
| The same metadata declarations in XML: |
| </p><pre class="programlisting"> |
| <entity-mappings> |
| <!-- declares a default access type for all entities --> |
| <access-type>FIELD</access-type> |
| <mapped-superclass class="org.mag.subscribe.Document"> |
| <attributes> |
| <id name="id"> |
| <generated-value strategy="IDENTITY"/> |
| </id> |
| <version name="version"/> |
| </attributes> |
| </mapped-superclass> |
| <entity class="org.mag.Magazine"> |
| <id-class="org.mag.Magazine$MagazineId"/> |
| <attributes> |
| <id name="isbn"/> |
| <id name="title"/> |
| <basic name="name"/> |
| <basic name="price"/> |
| <basic name="copiesSold"/> |
| <version name="version"/> |
| <many-to-one name="publisher" fetch="LAZY"> |
| <cascade> |
| <cascade-persist/> |
| </cascade> |
| </many-to-one> |
| <one-to-many name="articles"> |
| <order-by/> |
| <cascade> |
| <cascade-persist/> |
| <cascade-remove/> |
| </cascade> |
| </one-to-many> |
| <one-to-one name="coverArticle" fetch="LAZY"> |
| <cascade> |
| <cascade-persist/> |
| <cascade-remove/> |
| </cascade> |
| </one-to-one> |
| <transient name="data"/> |
| </attributes> |
| </entity> |
| <entity class="org.mag.Article"> |
| <attributes> |
| <id name="id"/> |
| <basic name="title"/> |
| <basic name="content"/> |
| <version name="version"/> |
| <many-to-many name="articles"> |
| <order-by>lastName, firstName</order-by> |
| </many-to-many> |
| </attributes> |
| </entity> |
| <entity class="org.mag.pub.Company"> |
| <attributes> |
| <id name="id"/> |
| <basic name="name"/> |
| <basic name="revenue"/> |
| <version name="version"/> |
| <one-to-many name="mags" mapped-by="publisher"> |
| <cascade> |
| <cascade-persist/> |
| </cascade> |
| </one-to-many> |
| <one-to-many name="subscriptions"> |
| <cascade> |
| <cascade-persist/> |
| <cascade-remove/> |
| </cascade> |
| </one-to-many> |
| </attributes> |
| </entity> |
| <entity class="org.mag.pub.Author"> |
| <attributes> |
| <id name="id"/> |
| <basic name="firstName"/> |
| <basic name="lastName"/> |
| <version name="version"/> |
| <many-to-many name="arts" mapped-by="authors"> |
| <cascade> |
| <cascade-persist/> |
| </cascade> |
| </many-to-many> |
| </attributes> |
| </entity> |
| <entity class="org.mag.subcribe.Contract"> |
| <attributes> |
| <basic name="terms"/> |
| </attributes> |
| </entity> |
| <entity class="org.mag.subcribe.Subscription"> |
| <attributes> |
| <id name="id"/> |
| <basic name="payment"/> |
| <basic name="startDate"/> |
| <version name="version"/> |
| <one-to-many name="items"> |
| <map-key name="num"> |
| <cascade> |
| <cascade-persist/> |
| <cascade-remove/> |
| </cascade> |
| </one-to-many> |
| </attributes> |
| </entity> |
| <entity class="org.mag.subscribe.Subscription.LineItem"> |
| <attributes> |
| <basic name="comments"/> |
| <basic name="price"/> |
| <basic name="num"/> |
| <many-to-one name="magazine"/> |
| </attributes> |
| </entity> |
| <entity class="org.mag.subscribe.LifetimeSubscription" name="Lifetime" |
| access="PROPERTY"> |
| <attributes> |
| <basic name="eliteClub" fetch="LAZY"/> |
| </attributes> |
| </entity> |
| <entity class="org.mag.subscribe.TrialSubscription" name="Trial"> |
| <attributes> |
| <basic name="endDate"/> |
| </attributes> |
| </entity> |
| <embeddable class="org.mag.pub.Address"> |
| <attributes> |
| <basic name="street"/> |
| <basic name="city"/> |
| <basic name="state"/> |
| <basic name="zip"/> |
| </attributes> |
| </embeddable> |
| </entity-mappings> |
| </pre></div></div><br class="example-break"><p> |
| <a href="jpa_overview_mapping.html" title="Chapter 12. Mapping Metadata">Chapter 12, <i xmlns:xlink="http://www.w3.org/1999/xlink"> |
| Mapping Metadata |
| </i></a> will show you how to map your |
| persistent classes to the datastore using additional annotations and XML markup. |
| First, however, we turn to the JPA runtime APIs. |
| </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="jpa_overview_meta_xml.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="jpa_overview_meta.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="jpa_overview_persistence.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3. |
| XML Schema |
| </td><td width="20%" align="center"><a accesskey="h" href="manual.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 6. |
| Persistence |
| </td></tr></table></div></body></html> |
