此内容没有您所选择的语言版本。

15.8. Querying Example

15.8.1. The Query Module Example
复制链接

The following provides an example of how to set up and run a query in JBoss Data Grid.

In this example, the "Person" object has been annotated using the following:

@Entity @ProvidedId @Indexed
public class Person
	implements Serializable {
		@Field(store = Store.YES)
		private String name;
		@Field
		private String description;
		@Field(store = Store.YES)
		private int age;
...
}

@Entity @ProvidedId @Indexed
public class Person
	implements Serializable {
		@Field(store = Store.YES)
		private String name;
		@Field
		private String description;
		@Field(store = Store.YES)
		private int age;
...
}

Copy to Clipboard

Toggle word wrap

Assuming several of these "Person" objects have been stored in JBoss Data Grid, they can be searched using querying. The following code creates a SearchManager and QueryBuilder instance:

SearchManager manager=
	Search.getSearchManager(cache);
QueryBuilder builder=
	sm.buildQueryBuilderForClass(Person.class) .get();
Query luceneQuery = builder.keyword()
			.onField("name")
			.matching("FirstName")
		.createQuery();

SearchManager manager=
	Search.getSearchManager(cache);
QueryBuilder builder=
	sm.buildQueryBuilderForClass(Person.class) .get();
Query luceneQuery = builder.keyword()
			.onField("name")
			.matching("FirstName")
		.createQuery();

Copy to Clipboard

Toggle word wrap

The SearchManager and QueryBuilder are used to construct a Lucene query. The Lucene query is then passed to the SearchManager to obtain a CacheQuery instance:

CacheQuery query = manager.getQuery(luceneQuery);
for (Object result: query) {
        System.out.println("Found " + result);
}

CacheQuery query = manager.getQuery(luceneQuery);
for (Object result: query) {
        System.out.println("Found " + result);
}

Copy to Clipboard

Toggle word wrap

This CacheQuery instance contains the results of the query, and can be used to produce a list or it can be used for repeat queries.

Important

The Query Module is currently only available as a Technical Preview for JBoss Data Grid 6.1.

Report a bug

返回顶部

此内容没有您所选择的语言版本。

15.8. Querying Example

15.8.1. The Query Module Example
复制链接

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

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

此内容没有您所选择的语言版本。

15.8. Querying Example

15.8.1. The Query Module Example复制链接链接已复制到粘贴板!

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

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

15.8.1. The Query Module Example
复制链接