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class="externalLink" title="Coding Standards">Coding Standards</a> + </li> + <li class="none"> + <a href="issuetracking.html" title="Issue Tracking">Issue Tracking</a> + </li> + <li class="none"> + <a href="dependencies.html" title="Dependencies">Dependencies</a> + </li> + </ul> + <a href="http://maven.apache.org/"; title="Built by Maven" class="poweredBy"> + <img class="poweredBy" alt="Built by Maven" src="./images/logos/maven-feather.png" /> + </a> + + + </div> + </div> + <div id="bodyColumn"> + <div id="contentBox"> + + + <div class="section"><h2>Which Persistence Specification ?<a name="Which_Persistence_Specification_"></a></h2> + <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. <B>Java Data Objects (JDO)</B> + Two of these are "standardised" (via the JCP). When developing your application you need + to choose the most appropriate technology for your needs. <b>Java Data Objects (JDO)</b> has been a standard since 2001 with the release of JDO1. It was improved with the release - of JDO2. Just to confuse issues the <B>Java Persistence API (JPA)</B> was approved + of JDO2. Just to confuse issues the <b>Java Persistence API (JPA)</b> 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, and JPA2 providing criteria queries. 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><table class="bodyTable"><tr class="a"><th width="20%">Feature</th><th width="40%">JDO</th><th width="40%">JPA</th></tr><tr class="b"><td>JDK Requirement</td><td><B>1.3+</B></td><td>1.5+</td></tr><tr class="a"><td>Usage</td><td>J2EE, J2SE</td><td>J2EE, J2SE</td></tr><tr class="b"><td>Persistence specification mechanism</td><td>XML, Annotations, <b>API</b></td><td>XML, Annotations</td></tr><tr class="a"><td>Datastore supported</td><td><B>Any</B></td><td>RDBMS only</td></tr><tr class="b"><td>Restrictions on persisted classes</td><td><B>no-arg constructor (could be added by compiler/enhancer)</B></td><td>No final classes. No final methods. Non-private no-arg constructor. Identity Field. - Version Field.</td></tr><tr class="a"><td>Ability to persist "transient" fields</td><td><B>Yes</B></td><td>No</td></tr><tr class="b"><td>Persist static/final fields</td><td>No</td><td>Not specified</td></tr><tr class="a"><td>Transactions</td><td><B>Pessimistic</B>, Optimistic</td><td>Optimistic, some locking</td></tr><tr class="b"><td>Object Identity</td><td><B>datastore-identity</B>, application-identity</td><td>application-identity</td></tr><tr class="a"><td>Object Identity generation</td><td>Sequence, Table, Identity, Auto, <B>UUID String, UUID Hex</B></td><td>Sequence, Table, Identity, Auto</td></tr><tr class="b"><td>Change objects identity</td><td><B>Throw exception when not allowed</B></td><td>Undefined !!</td></tr><tr class="a"><td>Supported types</td><td>Java primitive types, wrappers of primitive types, java.lang.String, <B>java.lang.Number</B>, java.math.BigInteger, java.math.BigDecimal, - <B>java.util.Currency, java.util.Locale</B>, java.util.Date, java.sql.Time, java.sql.Date, java.sql.Timestamp, java.io.Serializable, - <B>boolean[]</B>, byte[], char[], <B>double[], float[], int[], long[], short[]</B>, - <B>java.lang.Object</B>, <B>interface</B>, - <B>Boolean[]</B>, Byte[], Character[], <B>Double[], Float[], Integer[], Long[], Short[], BigDecimal[], BigInteger[], String[]</B>, - <B>PersistenceCapable[]</B>, <B>interface[]</B>, <B>Object[]</B>, Enums, + </p> + <table border="0" class="bodyTable"> + <tr class="a"> + <th width="20%">Feature</th> + <th width="40%">JDO</th> + <th width="40%">JPA</th> + </tr> + <tr class="b"> + <td>JDK Requirement</td> + <td><b>1.3+</b></td> + <td>1.5+</td> + </tr> + <tr class="a"> + <td>Usage</td> + <td>J2EE, J2SE</td> + <td>J2EE, J2SE</td> + </tr> + <tr class="b"> + <td>Persistence specification mechanism</td> + <td>XML, Annotations, <b>API</b></td> + <td>XML, Annotations</td> + </tr> + <tr class="a"> + <td>Datastore supported</td> + <td><b>Any</b></td> + <td>RDBMS only</td> + </tr> + <tr class="b"> + <td>Restrictions on persisted classes</td> + <td><b>no-arg constructor (could be added by compiler/enhancer)</b></td> + <td>No final classes. No final methods. Non-private no-arg constructor. Identity Field. + Version Field.</td> + </tr> + <tr class="a"> + <td>Ability to persist "transient" fields</td> + <td><b>Yes</b></td> + <td>No</td> + </tr> + <tr class="b"> + <td>Persist static/final fields</td> + <td>No</td> + <td>Not specified</td> + </tr> + <tr class="a"> + <td>Transactions</td> + <td><b>Pessimistic</b>, Optimistic</td> + <td>Optimistic, some locking</td> + </tr> + <tr class="b"> + <td>Object Identity</td> + <td><b>datastore-identity</b>, application-identity</td> + <td>application-identity</td> + </tr> + <tr class="a"> + <td>Object Identity generation</td> + <td>Sequence, Table, Identity, Auto, <b>UUID String, UUID Hex</b></td> + <td>Sequence, Table, Identity, Auto</td> + </tr> + <tr class="b"> + <td>Change objects identity</td> + <td><b>Throw exception when not allowed</b></td> + <td>Undefined !!</td> + </tr> + <tr class="a"> + <td>Supported types</td> + <td>Java primitive types, wrappers of primitive types, java.lang.String, <b>java.lang.Number</b>, java.math.BigInteger, java.math.BigDecimal, + <b>java.util.Currency, java.util.Locale</b>, java.util.Date, java.sql.Time, java.sql.Date, java.sql.Timestamp, java.io.Serializable, + <b>boolean[]</b>, byte[], char[], <b>double[], float[], int[], long[], short[]</b>, + <b>java.lang.Object</b>, <b>interface</b>, + <b>Boolean[]</b>, Byte[], Character[], <b>Double[], Float[], Integer[], Long[], Short[], BigDecimal[], BigInteger[], String[]</b>, + <b>PersistenceCapable[]</b>, <b>interface[]</b>, <b>Object[]</b>, Enums, java.util.Collection, java.util.Set, java.util.List, java.util.Map, - <B>Collection/List/Map of simple types</B>, <B>Collection/List/Map of reference (interface/Object) types</B>, + <b>Collection/List/Map of simple types</b>, <b>Collection/List/Map of reference (interface/Object) types</b>, Collection/List/Map of persistable types - </td><td>Java primitive types, wrappers of the primitive types, java.lang.String, java.math.BigInteger, java.math.BigDecimal, - java.util.Date, <B>java.util.Calendar</B>, java.sql.Date, java.sql.Time, java.sql.Timestamp, java.io.Serializable, + </td> + <td>Java primitive types, wrappers of the primitive types, java.lang.String, java.math.BigInteger, java.math.BigDecimal, + java.util.Date, <b>java.util.Calendar</b>, 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</td></tr><tr class="b"><td>Embedded Fields</td><td>Embedded persistent objects, <B>Embedded Collections, Embedded Maps</B></td><td>Embedded persistent objects</td></tr><tr class="a"><td>Access a non-detached field</td><td><B>Throw exception</B></td><td>Undefined !!</td></tr><tr class="b"><td>Inheritance</td><td><B>Each class has its own strategy</B></td><td>Root class defines the strategy</td></tr><tr class="a"><td>Operation cascade default</td><td>persist, (delete)</td><td></td></tr><tr class="b"><td>Operation Cascade configuration</td><td>delete</td><td>persist, delete, refresh</td></tr><tr class="a"><td>Query Language</td><td>JDOQL, SQL, others</td><td>JPQL, SQL</td></tr><tr class="b"><td>Query candidates</td><td><B>Candidate without subclasses</B>, Candidate and its subclasses</td><td>Candidate and its subclasses</td></tr><tr class="a"><td>Query of candidate collection</td><td><B>yes</B></td><td>no</td></tr ><tr class="b"><td>Query language case sensitivity</td><td>JDOQL >lowercase/UPPERCASE</td><td>JPQL case-insensitive</td></tr><tr >class="a"><td>Query language aliases</td><td>No, but has variables in >JDOQL</td><td>Yes in JPQL</td></tr><tr class="b"><td>Query Criteria >API</td><td>No, available as extension in >QueryDSL</td><td><b>Yes</b></td></tr><tr class="a"><td>Object retrieval >control</td><td>Lazy/Eager control, <B>fetch groups</B></td><td>Lazy/Eager >control</td></tr><tr class="b"><td>Bulk update/delete</td><td>JDOQL Bulk >Delete</td><td>JPQL Bulk Delete, <B>JPQL Bulk Update</B></td></tr><tr >class="a"><td>RDBMS Schema Control</td><td>Tables, columns, PK columns, <b>PK >constraints</b>, FK columns, <b>FK constraints</b>, <b>index columns</b>, - <b>index constraints</b>, unique key columns, <b>unique key constraints</b></td><td>Tables, columns, PK columns, FK columns, unique key columns</td></tr><tr class="b"><td>ORM Relationships</td><td><a href="jdo_v_jpa_orm.html"><b>Full range of Collection, Map, List, Array, 1-1, 1-N, M-N using - PC, Non-PC and interface objects</b></a></td><td>Basic 1-1, 1-N, M-N, Collection<NonPC>, Map<NonPC></td></tr><tr class="a"><td>Default ORM column size</td><td>256</td><td>255</td></tr><tr class="b"><td>Default ORM identifiers (tables/columns)</td><td>No</td><td>Yes</td></tr><tr class="a"><td>Default ORM mappings</td><td>Yes, JDBC types defined for Java types</td><td>No</td></tr><tr class="b"><td>Caching interface</td><td>L2 Caching API</td><td>L2 Caching API</td></tr></table><p> - As an overall conclusion "JPA" is a subset of what is already available in "JDO". - </p></div></div></div><div class="clear"><hr></hr></div><table border="0" width="100%" cellpadding="0" cellspacing="0"><tr><td width="100%"><img height="1" border="0" width="100%" src="./images/header_line.gif"></img></td></tr></table><div id="footer"><div class="xright"><a href="http://www.apache.org/foundation/sponsorship.html";>Be an Apache Software Foundation sponsor</a><br><a href="http://www.apache.org/foundation/thanks.html";>Thanks to ASF sponsors!</a></br></div><div class="xleft"> - Documentation published: <br></br> - © 2005-2011 <a href="http://www.apache.org/";>Apache Software Foundation</a></div></div></body></html> \ No newline at end of file + Collection/List/Map of persistable types</td> + </tr> + <tr class="b"> + <td>Embedded Fields</td> + <td>Embedded persistent objects, <b>Embedded Collections, Embedded Maps</b></td> + <td>Embedded persistent objects</td> + </tr> + <tr class="a"> + <td>Access a non-detached field</td> + <td><b>Throw exception</b></td> + <td>Undefined !!</td> + </tr> + <tr class="b"> + <td>Inheritance</td> + <td><b>Each class has its own strategy</b></td> + <td>Root class defines the strategy</td> + </tr> + <tr class="a"> + <td>Operation cascade default</td> + <td>persist, (delete)</td> + <td></td> + </tr> + <tr class="b"> + <td>Operation Cascade configuration</td> + <td>delete</td> + <td>persist, delete, refresh</td> + </tr> + <tr class="a"> + <td>Query Language</td> + <td>JDOQL, SQL, others</td> + <td>JPQL, SQL</td> + </tr> + <tr class="b"> + <td>Query candidates</td> + <td><b>Candidate without subclasses</b>, Candidate and its subclasses</td> + <td>Candidate and its subclasses</td> + </tr> + <tr class="a"> + <td>Query of candidate collection</td> + <td><b>yes</b></td> + <td>no</td> + </tr> + <tr class="b"> + <td>Query language case sensitivity</td> + <td>JDOQL lowercase/UPPERCASE</td> + <td>JPQL case-insensitive</td> + </tr> + <tr class="a"> + <td>Query language aliases</td> + <td>No, but has variables in JDOQL</td> + <td>Yes in JPQL</td> + </tr> + <tr class="b"> + <td>Query Criteria API</td> + <td>No, available as extension in QueryDSL</td> + <td><b>Yes</b></td> + </tr> + <tr class="a"> + <td>Object retrieval control</td> + <td>Lazy/Eager control, <b>fetch groups</b></td> + <td>Lazy/Eager control</td> + </tr> + <tr class="b"> + <td>Bulk update/delete</td> + <td>JDOQL Bulk Delete</td> + <td>JPQL Bulk Delete, <b>JPQL Bulk Update</b></td> + </tr> + <tr class="a"> + <td>RDBMS Schema Control</td> + <td>Tables, columns, PK columns, <b>PK constraints</b>, FK columns, <b>FK constraints</b>, <b>index columns</b>, + <b>index constraints</b>, unique key columns, <b>unique key constraints</b></td> + <td>Tables, columns, PK columns, FK columns, unique key columns</td> + </tr> + <tr class="b"> + <td>ORM Relationships</td> + <td><a href="jdo_v_jpa_orm.html"><b>Full range of Collection, Map, List, Array, 1-1, 1-N, M-N using + PC, Non-PC and interface objects</b></a></td> + <td>Basic 1-1, 1-N, M-N, Collection<NonPC>, Map<NonPC></td> + </tr> + <tr class="a"> + <td>Default ORM column size</td> + <td>256</td> + <td>255</td> + </tr> + <tr class="b"> + <td>Default ORM identifiers (tables/columns)</td> + <td>No</td> + <td>Yes</td> + </tr> + <tr class="a"> + <td>Default ORM mappings</td> + <td>Yes, JDBC types defined for Java types</td> + <td>No</td> + </tr> + <tr class="b"> + <td>Caching interface</td> + <td>L2 Caching API</td> + <td>L2 Caching API</td> + </tr> + </table> + <p> + As an overall conclusion "JPA" is a subset of what is already available in "JDO". + </p> + </div> + + + + </div> + </div> + <div class="clear"> + <hr/> + </div> + <div id="footer"> + <div class="xright"> + Copyright © 2005-2013. + All Rights Reserved. + + </div> + <div class="clear"> + <hr/> + </div> + </div> + </body> +</html>
Modified: websites/production/db/content/jdo/jdo_v_jpa_api.html ============================================================================== --- websites/production/db/content/jdo/jdo_v_jpa_api.html (original) +++ websites/production/db/content/jdo/jdo_v_jpa_api.html Tue Jan 15 06:29:01 2013 @@ -1,11 +1,297 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";><html><head><title>Java Data Objects (JDO) - JDO .v. 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JPA : API</h2><p> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";> +<!-- Generated by Apache Maven Doxia Site Renderer 1.3 at Jan 15, 2013 --> +<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en"> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <title>Maven - + JDO .v. JPA : API</title> + <style type="text/css" media="all"> + @import url("./css/maven-base.css"); + @import url("./css/maven-theme.css"); + @import url("./css/site.css"); + </style> + <link rel="stylesheet" href="./css/print.css" type="text/css" media="print" /> + <meta name="Date-Revision-yyyymmdd" content="20130115" /> + <meta http-equiv="Content-Language" content="en" /> + + </head> + <body class="composite"> + <div id="banner"> + <a href="./" id="bannerLeft"> + <img src="images/JDOx150.gif" alt="Apache JDO" /> + </a> + <a href="./" id="bannerRight"> + <img src="images/jdo_text.gif" alt="Apache JDO" /> + </a> + <div class="clear"> + <hr/> + </div> + </div> + <div id="breadcrumbs"> + + + <div class="xright"> <a href="http://wiki.apache.org/jdo"; class="externalLink" title="Wiki">Wiki</a> + | + <a href="http://issues.apache.org/jira/secure/BrowseProject.jspa?id=10630"; class="externalLink" title="Issue Tracker">Issue Tracker</a> + | + <a href="mail-lists.html" title="Mailing Lists">Mailing Lists</a> + | + <a href="api30/apidocs/index.html" title="Latest Javadocs">Latest Javadocs</a> + + + </div> + <div class="clear"> + <hr/> + </div> + </div> + <div id="leftColumn"> + <div id="navcolumn"> + + + <h5>General</h5> + <ul> + <li class="none"> + <a href="index.html" title="Home">Home</a> + </li> + <li class="none"> + <a href="why_jdo.html" title="Why JDO?">Why JDO?</a> + </li> + <li class="none"> + <a href="jdo_v_jpa.html" title="JDO v JPA">JDO v JPA</a> + </li> + <li class="none"> + <strong>JDO v JPA : API</strong> + </li> + <li class="none"> + <a href="jdo_v_jpa_orm.html" title="JDO v JPA : ORM">JDO v JPA : ORM</a> + </li> + <li class="none"> + <a href="downloads.html" title="Downloads">Downloads</a> + </li> + <li class="none"> + <a href="http://www.apache.org/licenses/LICENSE-2.0"; 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class="externalLink" title="Coding Standards">Coding Standards</a> + </li> + <li class="none"> + <a href="issuetracking.html" title="Issue Tracking">Issue Tracking</a> + </li> + <li class="none"> + <a href="dependencies.html" title="Dependencies">Dependencies</a> + </li> + </ul> + <a href="http://maven.apache.org/"; title="Built by Maven" class="poweredBy"> + <img class="poweredBy" alt="Built by Maven" src="./images/logos/maven-feather.png" /> + </a> + + + </div> + </div> + <div id="bodyColumn"> + <div id="contentBox"> + + + <div class="section"><h2>JDO .v. JPA : API<a name="JDO_.v._JPA_:_API"></a></h2> + <p> The two persistence standards in Java have very similar API's on the face of it. Here we give a comparison of the method calls and their equivalent in the other API. - </p><table class="bodyTable"><tr class="a"><th width="20%">Operation</th><th width="40%">JDO</th><th width="40%">JPA</th></tr><tr class="b"><td>Persist Object</td><td>pm.makePersistent()</td><td>em.persist</td></tr><tr class="a"><td>Update Object</td><td>pm.makePersistent()</td><td>em.merge()</td></tr><tr class="b"><td>Remove Object</td><td>pm.deletePersistent()</td><td>em.remove()</td></tr><tr class="a"><td>Retrieve Object</td><td>pm.getObjectById()<br></br> - pm.getExtent()</td><td>em.find()</td></tr><tr class="b"><td>Refresh Object</td><td>pm.refresh()</td><td>em.refresh()</td></tr><tr class="a"><td>Detach single Object</td><td>pm.detachCopy()</td><td>em.detach()</td></tr><tr class="b"><td>Flush changes</td><td>pm.flush()</td><td>em.flush()</td></tr><tr class="a"><td>Access transaction</td><td>pm.currentTransaction()</td><td>em.getTransaction()</td></tr><tr class="b"><td>New Query</td><td>pm.newQuery()</td><td>em.createQuery()</td></tr><tr class="a"><td>New Named Query</td><td>pm.newNamedQuery()</td><td>em.createNamedQuery()</td></tr><tr class="b"><td>New SQL Query</td><td>pm.newQuery()</td><td>em.createNativeQuery()</td></tr></table></div></div></div><div class="clear"><hr></hr></div><table border="0" width="100%" cellpadding="0" cellspacing="0"><tr><td width="100%"><img height="1" border="0" width="100%" src="./images/header_line.gif"></img></td></tr></table><div id="footer"><div class="xright"><a href= "http://www.apache.org/foundation/sponsorship.html";>Be an Apache Software Foundation sponsor</a><br><a href="http://www.apache.org/foundation/thanks.html";>Thanks to ASF sponsors!</a></br></div><div class="xleft"> - Documentation published: <br></br> - © 2005-2011 <a href="http://www.apache.org/";>Apache Software Foundation</a></div></div></body></html> \ No newline at end of file + </p> + <table border="0" class="bodyTable"> + <tr class="a"> + <th width="20%">Operation</th> + <th width="40%">JDO</th> + <th width="40%">JPA</th> + </tr> + <tr class="b"> + <td>Persist Object</td> + <td>pm.makePersistent()</td> + <td>em.persist</td> + </tr> + <tr class="a"> + <td>Update Object</td> + <td>pm.makePersistent()</td> + <td>em.merge()</td> + </tr> + <tr class="b"> + <td>Remove Object</td> + <td>pm.deletePersistent()</td> + <td>em.remove()</td> + </tr> + <tr class="a"> + <td>Retrieve Object</td> + <td>pm.getObjectById()<br /> + pm.getExtent()</td> + <td>em.find()</td> + </tr> + <tr class="b"> + <td>Refresh Object</td> + <td>pm.refresh()</td> + <td>em.refresh()</td> + </tr> + <tr class="a"> + <td>Detach single Object</td> + <td>pm.detachCopy()</td> + <td>em.detach()</td> + </tr> + <tr class="b"> + <td>Flush changes</td> + <td>pm.flush()</td> + <td>em.flush()</td> + </tr> + <tr class="a"> + <td>Access transaction</td> + <td>pm.currentTransaction()</td> + <td>em.getTransaction()</td> + </tr> + <tr class="b"> + <td>New Query</td> + <td>pm.newQuery()</td> + <td>em.createQuery()</td> + </tr> + <tr class="a"> + <td>New Named Query</td> + <td>pm.newNamedQuery()</td> + <td>em.createNamedQuery()</td> + </tr> + <tr class="b"> + <td>New SQL Query</td> + <td>pm.newQuery()</td> + <td>em.createNativeQuery()</td> + </tr> + </table> + </div> + + + + </div> + </div> + <div class="clear"> + <hr/> + </div> + <div id="footer"> + <div class="xright"> + Copyright © 2005-2013. + All Rights Reserved. + + </div> + <div class="clear"> + <hr/> + </div> + </div> + </body> +</html>
