第 4 章查询嵌入式缓存

当您将 Data Grid 作为自定义应用程序的库添加时，使用嵌入式查询。

使用嵌入式查询不需要 protobuf 映射。索引和查询都在 Java 对象之上完成。

4.1. 查询嵌入式缓存
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本节介绍如何使用名为"books"的示例缓存来查询嵌入式缓存，该缓存存储索引的 Book 实例。

在本例中，每个 Book 实例定义了索引哪些属性，并使用 Hibernate Search 注解指定一些高级索引选项，如下所示：

Book.java

package org.infinispan.sample;

import java.time.LocalDate;
import java.util.HashSet;
import java.util.Set;

import org.infinispan.api.annotations.indexing.*;

// Annotate values with @Indexed to add them to indexes
// Annotate each field according to how you want to index it
@Indexed
public class Book {
   @Keyword
   String title;

   @Text
   String description;

   @Keyword
   String isbn;

   @Basic
   LocalDate publicationDate;

   @Embedded
   Set<Author> authors = new HashSet<Author>();
}

package org.infinispan.sample;

import java.time.LocalDate;
import java.util.HashSet;
import java.util.Set;

import org.infinispan.api.annotations.indexing.*;

// Annotate values with @Indexed to add them to indexes
// Annotate each field according to how you want to index it
@Indexed
public class Book {
   @Keyword
   String title;

   @Text
   String description;

   @Keyword
   String isbn;

   @Basic
   LocalDate publicationDate;

   @Embedded
   Set<Author> authors = new HashSet<Author>();
}

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Author.java

package org.infinispan.sample;

import org.infinispan.api.annotations.indexing.Text;

public class Author {
   @Text
   String name;

   @Text
   String surname;
}

package org.infinispan.sample;

import org.infinispan.api.annotations.indexing.Text;

public class Author {
   @Text
   String name;

   @Text
   String surname;
}

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流程

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>

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

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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");

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");

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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();

// 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();

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第 4 章查询嵌入式缓存

4.1. 查询嵌入式缓存
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学习

尝试、购买和销售

社区

关于红帽文档

让开源更具包容性

關於紅帽

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Red Hat legal and privacy links

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第 4 章查询嵌入式缓存

4.1. 查询嵌入式缓存
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