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<h2 class="posttitle"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/" rel="bookmark" title="Permanent Link: StupidDB – object-persistence-framework">StupidDB – object-persistence-framework</a></h2>
<small>
Posted by <a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/author/sko/" title="Posts by Stefan Kölle">Stefan Kölle</a> in <a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/category/release/" rel="category tag">Release</a>, <a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/category/stupiddb/" rel="category tag">StupidDB</a>, tags: <a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/tag/stupiddb/" rel="tag">StupidDB</a> </small>
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<p>Angeregt durch die Diskussion auf dem Open-Spaces zum Thema schemalose Datenbanken, werden wir heute bereits die Vorabversion unserer StupidDB als open-source releasen.</p>
<p>Die StupidDB entstand bei uns aus der Notwendigkeit, immer wieder Objekte und Files schnell und einfach zu speichern, dies serverlos und trotzdem skalierbar und hochverfügbar vorzuhalten. Die StupidDB lässt sich am besten wie folgt beschreiben:</p>
<blockquote><p>StupidDB ist ein einfaches Objektspeicherungs-Framework auf dem Filesystem. Vergleichbar mit dem WebCache kann man in der StupidDB jegliches Objekt ablegen, welches kosteneffizient auf dem Filesystem gespeichert wird. Geladen werden können Objekte und Binärdaten mit einem eindeutigen Key und einer Partition. Den echten Speicherort auf der Festplatte ermittelt StupidDB selbst. Durch Replikation des Filesystems z.B. per Windows-DFS ist zudem eine einfache Hochverfügbarkeit und Skalierbarkeit der Datenbasis herzustellen.</p></blockquote>
<p>Angeregt durch einen <a href="https://web.archive.org/web/20210419185530/http://techblog.tilllate.com/2008/08/14/webtuesday-lightning-talk-slides/" target="_blank">Blogeintrag von tilllate.com</a> letztes Jahr, entstand bereits vor einem Jahr die erste Version von StupidDB, welches bis zum Blogeintrag nur aus einem Konzept bestand. Leo Büttiker hat zwar ein leicht anderes Konzept als unsere Implementierung, in den Kernpunkten ähnelt sich aber das Design. StupidDB bekam durch diesen Blogpost damals jedoch seinen Namen.</p>
<p>Für folgende Anwendungsszenarien sehen wir StupidDB als geeignet:</p>
<ul>
<li> Userdaten wie Fotos und Mediadaten, die eine Datenbank nur unnötig aufblähen</li>
<li> temporäre Daten</li>
<li> Statusdaten</li>
<li>Versionierung von Daten</li>
</ul>
<p>Als Vorteile gegenüber z.B. MogileFS, CouchDB zählt für uns vor allem, dass kein zentraler Server für die Datenbank benötigt wird, sondern nur ein Share im Netz. Die Implementierung ist dadurch enorm vereinfacht. Mit weiteren Windows-Board-Mitteln kann man danach das ganze System um Hochverfügbarkeit und Skalierbarkeit einfach ausbauen.</p>
<p>Die Nutzung selbst ist denkbar einfach. Folgendes Mitarbeiter-Objekt möchte ich speichern.</p>
<div style="font-family: Courier New; font-size: 10pt; color: black; background: white;">
<p style="margin: 0px;"><span style="color: #2b91af;"> 65</span> <span style="color: blue;">public</span> <span style="color: blue;">class</span> <span style="color: #2b91af;">Mitarbeiter</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 66</span> {</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 67</span> <span style="color: blue;">public</span> <span style="color: blue;">int</span> Id { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 68</span> <span style="color: blue;">public</span> <span style="color: blue;">string</span> Name { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 69</span> <span style="color: blue;">public</span> <span style="color: blue;">string</span> Vorname { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 70</span> <span style="color: blue;">public</span> <span style="color: blue;">string</span> Ort { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 71</span> <span style="color: blue;">public</span> <span style="color: blue;">string</span> Plz { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 72</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 73</span> <span style="color: blue;">public</span> <span style="color: blue;">string</span> VollerName</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 74</span> {</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 75</span> <span style="color: blue;">get</span> { <span style="color: blue;">return</span> <span style="color: blue;">string</span>.Format(<span style="color: #a31515;">“{0} {1}”</span>, Vorname, Name); }</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 76</span> }</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 77</span> }</p>
</div>
<p>Dazu nutzt man die Put-Methode der StupidDB.</p>
<div style="font-family: Courier New; font-size: 10pt; color: black; background: white;">
<p style="margin: 0px;"><span style="color: #2b91af;"> 20</span> <span style="color: #2b91af;">IStupidDB</span> stupidDB = <span style="color: blue;">new</span> <span style="color: #2b91af;">StupidDB</span>(<span style="color: #a31515;">“test”</span>);</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 21</span> <span style="color: #2b91af;">Mitarbeiter</span> mitarbeiter = <span style="color: blue;">new</span> <span style="color: #2b91af;">Mitarbeiter</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 22</span> {</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 23</span> Id = 1,</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 24</span> Name = <span style="color: #a31515;">“Christian”</span>,</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 25</span> Vorname = <span style="color: #a31515;">“Thomas”</span>,</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 26</span> Ort = <span style="color: #a31515;">“Rosenheim”</span>,</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 27</span> Plz = <span style="color: #a31515;">“83026”</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 28</span> };</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 29</span> stupidDB.Put( <span style="color: #a31515;">“TestPartition”</span>, <span style="color: #a31515;">“EinMitarbeiter”</span>, mitarbeiter );</p>
</div>
<p>Um das gleiche Objekt wieder zu lesen, nutzt man mal eine Get Methode. Die Parameter sind Partition und Key:</p>
<div style="font-family: Courier New; font-size: 10pt; color: black; background: white;">
<p style="margin: 0px;"><span style="color: #2b91af;"> 32</span> <span style="color: #2b91af;">Mitarbeiter</span> mitarbeiterAusgelesen =</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 33</span> (<span style="color: #2b91af;">Mitarbeiter</span>)stupidDB.GetObject(</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 34</span> <span style="color: #a31515;">“TestPartition”</span>,</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 35</span> <span style="color: #a31515;">“EinMitarbeiter”</span>,</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 36</span> <span style="color: blue;">typeof</span>(<span style="color: #2b91af;">Mitarbeiter</span>)</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 37</span> );</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 38</span> <span style="color: blue;">if</span> (mitarbeiterAusgelesen != <span style="color: blue;">null</span>)</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 39</span> {</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 40</span> <span style="color: #2b91af;">Console</span>.WriteLine(<span style="color: #a31515;">“Name des Mitarbeiters: {0}”</span>,</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 41</span> mitarbeiterAusgelesen.VollerName);</p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 42</span> }</p>
</div>
<p>Die StupidDB selbst wird über die app.config definiert.</p>
<div style="font-family: Courier New; font-size: 10pt; color: black; background: white;">
<p style="margin: 0px;"><span style="color: #2b91af;"> 3</span> <span style="color: blue;">&lt;</span><span style="color: #a31515;">configuration</span><span style="color: blue;">&gt;</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 4</span> <span style="color: blue;"> &lt;</span><span style="color: #a31515;">configSections</span><span style="color: blue;">&gt;</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 5</span> <span style="color: blue;"> &lt;</span><span style="color: #a31515;">section</span><span style="color: blue;"> </span><span style="color: red;">name</span><span style="color: blue;">=</span>“<span style="color: blue;">stupidDB</span>“<span style="color: blue;"> </span><span style="color: red;">type</span><span style="color: blue;">=</span>“<span style="color: blue;">Aztec.StupidDB.DBConfigCollection, Aztec.StupidDB, Version=1.0.0.0, Culture=neutral</span>“<span style="color: blue;"> </span><span style="color: red;">allowLocation</span><span style="color: blue;">=</span>“<span style="color: blue;">true</span>“<span style="color: blue;"> </span><span style="color: red;">allowDefinition</span><span style="color: blue;">=</span>“<span style="color: blue;">Everywhere</span>“<span style="color: blue;">/&gt;</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 6</span> <span style="color: blue;"> &lt;/</span><span style="color: #a31515;">configSections</span><span style="color: blue;">&gt;</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 7</span> <span style="color: blue;"> &lt;</span><span style="color: #a31515;">stupidDB</span><span style="color: blue;">&gt;</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 8</span> <span style="color: blue;"> &lt;</span><span style="color: #a31515;">DB</span><span style="color: blue;"> </span><span style="color: red;">name</span><span style="color: blue;">=</span>“<span style="color: blue;">test</span>“<span style="color: blue;"> </span><span style="color: red;">root</span><span style="color: blue;">=</span>“<span style="color: blue;">temp\test</span>“<span style="color: blue;"> </span><span style="color: red;">tiefe</span><span style="color: blue;">=</span>“<span style="color: blue;">3</span>“<span style="color: blue;"> </span><span style="color: red;">versionierung</span><span style="color: blue;">=</span>“<span style="color: blue;">false</span>“<span style="color: blue;"> /&gt;</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 9</span> <span style="color: blue;"> &lt;/</span><span style="color: #a31515;">stupidDB</span><span style="color: blue;">&gt;</span></p>
<p style="margin: 0px;"><span style="color: #2b91af;"> 10</span> <span style="color: blue;">&lt;/</span><span style="color: #a31515;">configuration</span><span style="color: blue;">&gt;</span></p>
</div>
<p>Wer sich den aktuellen Code einmal ansehen möchte, kann dies gerne unter folgendem Link ansehen:<a href="https://web.archive.org/web/20210419185530/https://stupiddb.svn.sourceforge.net/svnroot/stupiddb/trunk"><br>
https://stupiddb.svn.sourceforge.net/svnroot/stupiddb/trunk</a></p>
<p><a href="https://web.archive.org/web/20210419185530/http://dotnet-kicks.de/kick/?url=http%3a%2f%2fblog.aztec-project.org%2f2009%2f07%2f13%2fstupiddb-object-persistence-framework%2f"><img src="./stupiddb1_files/KickItImageGenerator.ashx" border="0" alt="kick it on dotnet-kicks.de"></a></p>
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<div id="comments">
7 Responses to “StupidDB – object-persistence-framework”
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<ol class="commentlist" id="commentlist">
<li class="comment even thread-even depth-1 alt" id="comment-322">
<div id="div-comment-322" class="comment-body">
<span class="switch-post"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#"><img src="./stupiddb1_files/bullet_toggle_minus(1).png" alt="" class="png"></a></span><div class="comment-author vcard">
<img alt="" src="./stupiddb1_files/fd26012e9b6baacc2b78bcdb1740a61a" srcset="https://web.archive.org/web/20210419185530im_/http://0.gravatar.com/avatar/fd26012e9b6baacc2b78bcdb1740a61a?s=64&amp;d=identicon&amp;r=g 2x" class="avatar avatar-32 photo" height="32" width="32"> <cite class="fn">Doku</cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#comment-322">
March 1, 2010 at 9:59 am </a>
</div>
<div class="comment"><p>Coole Sache, gibt es dazu eine Doku der Funktionen wie .Backup<br>
und der möglichen werte, wie Tiefe, Versionierung etc?</p></div>
<div class="comment"><p>Vielen Dank.</p></div>
</div>
</li>
<li class="comment byuser comment-author-sko bypostauthor odd alt thread-odd thread-alt depth-1" id="comment-324">
<div id="div-comment-324" class="comment-body">
<span class="switch-post"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#"><img src="./stupiddb1_files/bullet_toggle_minus(1).png" alt="" class="png"></a></span><div class="comment-author vcard">
<img alt="" src="./stupiddb1_files/dd231104fe0e1a7b87be55834a7c0c86.jpeg" srcset="https://web.archive.org/web/20210419185530im_/http://1.gravatar.com/avatar/dd231104fe0e1a7b87be55834a7c0c86?s=64&amp;d=identicon&amp;r=g 2x" class="avatar avatar-32 photo" height="32" width="32"> <cite class="fn"><a href="https://web.archive.org/web/20210419185530/http://www.stefankoelle.de/" rel="external nofollow ugc" class="url">Stefan Kölle</a></cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#comment-324">
March 1, 2010 at 12:21 pm </a>
</div>
<div class="comment"><p>Es gibt aktuell noch keine Doku, im Code wird einiges erklaert jedoch sicher nicht ausreichend. </p></div>
<div class="comment"><p>In der aktuellen Ausgabe der dotnetpro gibt es jedoch einen Artikel zu StupidDB, dort erklaere ich die Parameter noch einmal genauer. Auch das Thema Tiefe, Versionierung usw. <a href="https://web.archive.org/web/20210419185530/http://www.dotnetpro.de/CurrentIssue.aspx" rel="nofollow ugc">http://www.dotnetpro.de/CurrentIssue.aspx</a></p></div>
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</li>
<li class="comment even thread-even depth-1 alt" id="comment-349">
<div id="div-comment-349" class="comment-body">
<span class="switch-post"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#"><img src="./stupiddb1_files/bullet_toggle_minus(1).png" alt="" class="png"></a></span><div class="comment-author vcard">
<img alt="" src="./stupiddb1_files/d1bda30d19e96280487c119546a5facc" srcset="https://web.archive.org/web/20210419185530im_/http://1.gravatar.com/avatar/d1bda30d19e96280487c119546a5facc?s=64&amp;d=identicon&amp;r=g 2x" class="avatar avatar-32 photo" height="32" width="32"> <cite class="fn">UweD</cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#comment-349">
March 9, 2010 at 5:47 pm </a>
</div>
<div class="comment"><p>Scheint ja wirklich toll zu sein. Leider findet man im Web noch nicht allzuviel darüber. Der Artikel in der dotnetpro sagt einiges, aber zu dem Pfad kann ich nirgends etwas finden.<br>
Wenn ich root=“temp\test“ angebe, wo liegt das dann physisch?</p></div>
</div>
</li>
<li class="comment byuser comment-author-sko bypostauthor odd alt thread-odd thread-alt depth-1" id="comment-350">
<div id="div-comment-350" class="comment-body">
<span class="switch-post"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#"><img src="./stupiddb1_files/bullet_toggle_minus(1).png" alt="" class="png"></a></span><div class="comment-author vcard">
<img alt="" src="./stupiddb1_files/dd231104fe0e1a7b87be55834a7c0c86.jpeg" srcset="https://web.archive.org/web/20210419185530im_/http://1.gravatar.com/avatar/dd231104fe0e1a7b87be55834a7c0c86?s=64&amp;d=identicon&amp;r=g 2x" class="avatar avatar-32 photo" height="32" width="32"> <cite class="fn"><a href="https://web.archive.org/web/20210419185530/http://www.stefankoelle.de/" rel="external nofollow ugc" class="url">Stefan Kölle</a></cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#comment-350">
March 9, 2010 at 5:52 pm </a>
</div>
<div class="comment"><p>Hallo, Uwe,</p></div>
<div class="comment"><p>man kann bei root einfach einen absoluten Pfad angeben, z.B. c:\temp\stupiddb\</p></div>
<div class="comment"><p>Ohne der Angabe eines Pfades wird die StupidDB im Ausfuehrungsverzeichnis angelegt.</p></div>
<div class="comment"><p>Gruss<br>
Stefan</p></div>
</div>
</li>
<li class="comment even thread-even depth-1 alt" id="comment-503">
<div id="div-comment-503" class="comment-body">
<span class="switch-post"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#"><img src="./stupiddb1_files/bullet_toggle_minus(1).png" alt="" class="png"></a></span><div class="comment-author vcard">
<img alt="" src="./stupiddb1_files/0506b93e46367ba426b9351036ff69ef" srcset="https://web.archive.org/web/20210419185530im_/http://0.gravatar.com/avatar/0506b93e46367ba426b9351036ff69ef?s=64&amp;d=identicon&amp;r=g 2x" class="avatar avatar-32 photo" height="32" width="32"> <cite class="fn">Uwe</cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#comment-503">
January 4, 2011 at 11:17 am </a>
</div>
<div class="comment"><p>Hallo,<br>
ich bin nun nicht so firm in C#. Gibt es Beispiel für IStupidDB.Dir ?</p></div>
<div class="comment"><p>Danke<br>
Uwe</p></div>
</div>
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<li class="comment byuser comment-author-ase odd alt thread-odd thread-alt depth-1" id="comment-504">
<div id="div-comment-504" class="comment-body">
<span class="switch-post"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#"><img src="./stupiddb1_files/bullet_toggle_minus(1).png" alt="" class="png"></a></span><div class="comment-author vcard">
<img alt="" src="./stupiddb1_files/8e8da2fc0bc939d05e03fcaa078b3859.jpeg" srcset="https://web.archive.org/web/20210419185530im_/http://2.gravatar.com/avatar/8e8da2fc0bc939d05e03fcaa078b3859?s=64&amp;d=identicon&amp;r=g 2x" class="avatar avatar-32 photo" height="32" width="32"> <cite class="fn"><a href="https://web.archive.org/web/20210419185530/http://www.in-your-face.org/" rel="external nofollow ugc" class="url">Andreas Seebauer</a></cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#comment-504">
January 12, 2011 at 12:05 pm </a>
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<div class="comment"><p>Hallo, Uwe,</p></div>
<div class="comment"><p>hier ein kleines Beispiel für die Verwendung von IStupidDB.Dir in C#:</p></div>
<div class="comment"><p>IStupidDB sdb = new StupidDB(“meinDbName”);<br>
string partition = “Beispielpartition”;<br>
string key = “Beispielkey”;<br>
// Speichern des strings “Beispiel” unter Key “Beispielkey” in Partition “Beispielpartition”<br>
sdb.Put(partition, key, “Beispiel”);<br>
// Auflisten aller Keys in Partition “Beispielpartition”<br>
List<string> listKeys = sdb.Dir(partition);</string></p></div>
<div class="comment"><p>Mit den zurückgelieferten Keys können dann die Objekte via GetObject ausgelesen werden.<br>
Ich hoffe das beantwortet deine Frage.</p></div>
<div class="comment"><p>Gruß<br>
Andreas</p></div>
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<li class="comment even thread-even depth-1 alt" id="comment-505">
<div id="div-comment-505" class="comment-body">
<span class="switch-post"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#"><img src="./stupiddb1_files/bullet_toggle_minus(1).png" alt="" class="png"></a></span><div class="comment-author vcard">
<img alt="" src="./stupiddb1_files/0506b93e46367ba426b9351036ff69ef" srcset="https://web.archive.org/web/20210419185530im_/http://0.gravatar.com/avatar/0506b93e46367ba426b9351036ff69ef?s=64&amp;d=identicon&amp;r=g 2x" class="avatar avatar-32 photo" height="32" width="32"> <cite class="fn">Uwe</cite> <span class="says">says:</span> </div>
<div class="comment-meta commentmetadata"><a href="https://web.archive.org/web/20210419185530/https://blog.aztec-project.org/2009/07/13/stupiddb-object-persistence-framework/#comment-505">
January 12, 2011 at 4:23 pm </a>
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<div class="comment"><p>Hallo Andreas,<br>
nein, nicht ganz!<br>
Laut Doc gibt es<br>
Dir – Listet alle Schlüssel einer Partition) und<br>
Dir – Liefert ein IDictionary aller Schlüssel mit zugehörigem Objekt .</p></div>
<div class="comment"><p>Mit geht es um das 2. Dir.</p></div>
<div class="comment"><p>Uwe</p></div>
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