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| <h2 id="index">Which Persistence Specification ?<a id="Which_Persistence_Specification_"></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>There are several competing persistence technologies available for Java. |
| Two of these are "standardised" (via the JCP). When developing your |
| application you need to choose the most appropriate technology for your |
| needs. <strong>Java Data Objects (JDO)</strong> has been a standard since 2001 with the |
| release of JDO1. It was improved with the release of JDO2. Just to |
| confuse issues the <strong>Java Persistence API (JPA)</strong> was approved in its JPA1 |
| form, and JDO2.1/JDO2.2 provide updates to JDO2 building on some of the |
| new features of JPA1. Since then we have had JDO3 adding on extra |
| metadata and enhancer standardisation, JPA2 providing criteria queries |
| and JPA2.1 adding some further features. Below we show some of the |
| differences of these 2 standards to give you assistance in selecting |
| what you need. Highlighted in bold are the notable differences where one |
| specification provides something not available in the other.</p> |
| </div> |
| <table class="tableblock frame-all grid-cols spread"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
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| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Feature</th> |
| <th class="tableblock halign-left valign-top">JDO</th> |
| <th class="tableblock halign-left valign-top">JPA</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDK Requirement</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>1.3+</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1.5+</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Usage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">J2EE, J2SE</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">J2EE, J2SE</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Persistence specification mechanism</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">XML, Annotations, <strong>API</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">XML, |
| Annotations</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Datastore supported</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Any</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RDBMS only</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Restrictions on persisted classes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>no-arg constructor (could be added |
| by compiler/enhancer)</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">No final classes. No final methods. Non-private |
| no-arg constructor. Identity Field. Version Field.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Ability to persist "transient" fields</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Yes</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">No</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Persist static/final fields</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">No</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Not specified</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Transactions</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Pessimistic</strong>, Optimistic</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Optimistic, some locking</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Object Identity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>datastore-identity</strong>, application-identity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">application-identity</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Object Identity generation</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Sequence, Table, Identity, Auto, <strong>UUID |
| String, UUID Hex</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Sequence, Table, Identity, Auto</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Change objects identity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Throw exception when not allowed</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Undefined |
| !!</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Supported types</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Java primitive types, wrappers of primitive types, |
| java.lang.String, <strong>java.lang.Number</strong>, java.math.BigInteger, |
| java.math.BigDecimal, <strong>java.util.Currency, java.util.Locale</strong>, |
| java.util.Date, java.sql.Time, java.sql.Date, java.sql.Timestamp, |
| java.io.Serializable, <strong>boolean[]</strong>, byte[], char[], <strong>double[], float[], |
| int[], long[], short[]</strong>, <strong>java.lang.Object</strong>, <strong>interface</strong>, <strong>Boolean[]</strong>, |
| Byte[], Character[], <strong>Double[], Float[], Integer[], Long[], Short[], |
| BigDecimal[], BigInteger[], String[]</strong>, <strong>PersistenceCapable[]</strong>, |
| <strong>interface[]</strong>, <strong>Object[]</strong>, Enums, java.util.Collection, java.util.Set, |
| java.util.List, java.util.Map, <strong>Collection/List/Map of simple types</strong>, |
| <strong>Collection/List/Map of reference (interface/Object) types</strong>, |
| Collection/List/Map of persistable types</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Java primitive types, wrappers |
| of the primitive types, java.lang.String, java.math.BigInteger, |
| java.math.BigDecimal, java.util.Date, <strong>java.util.Calendar</strong>, |
| java.sql.Date, java.sql.Time, java.sql.Timestamp, java.io.Serializable, |
| byte[], Byte[], char[], Character[], Enums, java.util.Collection, |
| java.util.Set, java.util.List, java.util.Map Collection/List/Map of |
| persistable types</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Embedded Fields</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Embedded persistent objects, <strong>Embedded Collections, |
| Embedded Maps</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Embedded persistent objects</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Access a non-detached field</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Throw exception</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Undefined !!</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Inheritance</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Each class has its own strategy</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Root class defines the |
| strategy</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Operation cascade default</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">persist, (delete)</p></td> |
| <td class="tableblock halign-left valign-top"></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Operation Cascade configuration</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">delete</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">persist, delete, refresh</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Query Language</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOQL, SQL, others</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JPQL, SQL</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Query candidates</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Candidate without subclasses</strong>, Candidate and its |
| subclasses</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Candidate and its subclasses</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Query of candidate collection</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>yes</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">no</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Query language case sensitivity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOQL lowercase/UPPERCASE</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JPQL |
| case-insensitive</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Query language aliases</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">No, but has variables in JDOQL</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Yes in JPQL</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Query Criteria API</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">No, available as extension in QueryDSL</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><strong>Yes</strong></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Object retrieval control</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Lazy/Eager control, <strong>fetch groups</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Lazy/Eager control, <strong>entity graphs</strong></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Bulk update/delete</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOQL Bulk Delete</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JPQL Bulk Delete, <strong>JPQL Bulk |
| Update</strong></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RDBMS Schema Control</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Tables, columns, PK columns, <strong>PK constraints</strong>, FK |
| columns, <strong>FK constraints</strong>, <strong>index columns</strong>, <strong>index constraints</strong>, unique |
| key columns, <strong>unique key constraints</strong></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Tables, columns, PK columns, FK |
| columns, unique key columns</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ORM Relationships</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><a href="jdo_v_jpa_orm.html"><strong>Full range of Collection, |
| Map, List, Array, 1-1, 1-N, M-N using PC, Non-PC and interface objects</strong></a></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Basic 1-1, 1-N, M-N, Collection<NonPC>, Map<NonPC></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Default ORM column size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">256</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">255</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Default ORM identifiers (tables/columns)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">No</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Yes</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Default ORM mappings</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Yes, JDBC types defined for Java types</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">No</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Caching interface</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">L2 Caching API</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">L2 Caching API</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>As an overall conclusion "JPA" is a subset of what is available in |
| "JDO".</p> |
| </div> |
| </div> |
| </div> |
| </div> |
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