第 4 章 查询嵌入式缓存

流程

1. 配置 Data Grid 以索引"books"缓存，并将 org.infinispan.sample.Book 指定为要索引的实体。

   <distributed-cache name="books">
     <indexing path="${user.home}/index">
       <indexed-entities>
         <indexed-entity>org.infinispan.sample.Book</indexed-entity>
       </indexed-entities>
     </indexing>
   </distributed-cache>

2. 获取缓存。

   import org.infinispan.Cache;
   import org.infinispan.manager.DefaultCacheManager;
   import org.infinispan.manager.EmbeddedCacheManager;
   
   EmbeddedCacheManager manager = new DefaultCacheManager("infinispan.xml");
   Cache<String, Book> cache = manager.getCache("books");

3. 对存储在 Data Grid 缓存中的 Book 实例中的字段执行查询，如下例所示：

   // Create an Ickle query that performs a full-text search using the ':' operator on the 'title' and 'authors.name' fields
   // You can perform full-text search only on indexed caches
   Query<Book> fullTextQuery = cache.query("FROM org.infinispan.sample.Book b WHERE b.title:'infinispan' AND b.authors.name:'sanne'");
   
   // Use the '=' operator to query fields in caches that are indexed or not
   // Non full-text operators apply only to fields that are not analyzed
   Query<Book> exactMatchQuery= cache.query("FROM org.infinispan.sample.Book b WHERE b.isbn = '12345678' AND b.authors.name : 'sanne'");
   
   // You can use full-text and non-full text operators in the same query
   Query<Book> query= cache.query("FROM org.infinispan.sample.Book b where b.authors.name : 'Stephen' and b.description : (+'dark' -'tower')");
   
   // Get the results
   List<Book> found=query.execute().list();