I m New to both db4o and Lucene.
目前,Im利用db4o维持我关于安套的数据。 我需要有能力进行快速搜查,并向用户提出建议(如汽车完整建议)。
一个SO海报提到使用Lucene作为数据索引,而db4o则用于储存。
是否有任何人采用这种办法? 如果是的话,我将不胜感激。 有哪些替代办法?
我利用Lucene从数据库中储存的物品中提取关键词,并储存我称之为关键词延伸物体,标明相应的领域物体。 这使得域标有关键词(也允许加以制止),并分离了关键词的关切。 数据库是从一个大型静态数据集(美元食品营养素数据库)建造的,因此,我没有必要担心在运行期间的变化。 因此,目前形式的这一解决办法是有限的。
解决办法的第一部分是将一部略微的法典编成一个地图,其中含有一些文字,并摘录。 您利用这一方法从你储存在数据库中的一些领域物体中提取关键词/项目。 我保留了最初的关键词,以便我能够就搜查工作得出某种统计数据。
第二部分是构造我称之为关键词的延伸,把 stem作为阵列和相应的关键词作为另一阵列加以储存,并对具有关键词的相应领域标有点(由于与非行4O合作比较容易)。 我还将我的关键词句缩略为与特定领域物体的类型相对应,例如,我正在储存一个Nutrient域标和相应的NutrientKeyword Extension标。
The third part is to collect the user s entered search text, again use the stemmer to extract the stems, and search for the NutrientKeywordExtension objects with those stems. You can then grab the Nutrient objects that those extensions point to, and finally present them as search results.
As I said, my database was static - it s created the first time the application runs. In a dynamic database, you would need to worry about keeping the nutrients and corresponding keyword extensions in sync. One solution would be to merge the nutrient and nutrient keyword extension into one class if you don t mind having that stuff inside your domain objects (I don t like this). Otherwise, you need to account for keyword extensions every time your create/edit/delete your domain objects.
I hope this limited example helps.
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