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                  <span class="slideshow-title" style="font-size:14px;">Apache Persistence Layers</span><br />
                  From: <a href="http://www.slideshare.net/hgschmie" class="slideshow-author">hgschmie</a>,
                  <span class="ago">7 months ago</span><br /><br />
                  <div class="slideshow-embed"><div style="width:425px;text-align:left" id="__ss_346024"><a style="font:14px Helvetica,Arial,Sans-serif;display:block;margin:12px 0 3px 0;text-decoration:underline;" href="http://www.slideshare.net/hgschmie/apache-persistence-layers?type=powerpoint" title="Apache Persistence Layers">Apache Persistence Layers</a><object style="margin:0px" width="425" height="355"><param name="movie" value="http://static.slideshare.net/swf/ssplayer2.swf?doc=apache-persistence-layers-1207838095274353-8&stripped_title=apache-persistence-layers" /><param name="allowFullScreen" value="true"/><param name="allowScriptAccess" value="always"/><embed src="http://static.slideshare.net/swf/ssplayer2.swf?doc=apache-persistence-layers-1207838095274353-8&stripped_title=apache-persistence-layers" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="355"></embed></object><div style="font-size:11px;font-family:tahoma,arial;height:26px;padding-top:2px;">View SlideShare <a style="text-decoration:underline;" href="http://www.slideshare.net/hgschmie/apache-persistence-layers?type=powerpoint" title="View Apache Persistence Layers on SlideShare">presentation</a> or <a style="text-decoration:underline;" href="http://www.slideshare.net/upload?type=powerpoint">Upload</a> your own. (tags: <a style="text-decoration:underline;" href="http://slideshare.net/tag/apachecon">apachecon</a> <a style="text-decoration:underline;" href="http://slideshare.net/tag/ibatis">ibatis</a>)</div></div></div><br /><br />
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Apache Persistence Layers

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Slide 1:Cayenne, OpenJPA, iBatis Apache Persistence Layers ApacheCon EU 2008 Henning Schmiedehausen henning@apache.org
Slide 2:The O/R impedance mismatch People firstName: String name: String member: Boolean 1 ? 0..n Contact type: Integer info: String Objects (Java Knowledge) RDBMS
Slide 3: In a nutshell… “Object-Relational mapping (O/RM), is a programming technique that links databases to object-oriented language concepts, creating (in effect) a ‘virtual object database’.” – Wikipedia
Slide 4: Selection criterias • Data access (CRUD) • Developers knowledge • Database languages (SQL, DDL)
Slide 5: Can we stop here? I just need to query data for my (web) application. I could use the

Apache Persistence Layers

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