今天发现排序不管事,
查了一下:索引的问题:排序的列不进行分词只进行索引,才可以。
我们在使用lucene管理document时,难免有些复杂,并且在做增量索引的时候会比较繁琐,现介绍compass如下:
compass对lucene的使用就如同Hibernate和对jdbc的使用。
Compass的使用步骤:
Hibernate的实现步骤是:
1》 设计实体
2》 配置映射元数据 (xml / 注解—Hibernate3才推出来的)
3》 利用Hibernate的api完成对实体的CURD
我们目前使用compass的操作步骤就与Hibernate的基本一样的:
Hibernate的第二步是映射到数据库,而compass是映射到收索引擎里面去。
1》 设计收索实体 – 就 是一个普通的javabean
你要写这么一个实体,定义一些属性,好比产品的id、名称
2》 配置映射元数据 – 针对收索引擎映射-我们采用主注解的方式
我们使用@Searchable 标注映射为收索实体,映射到Lucene中的document
假设是采用注解的形式,我们就需要在实体和属性上面加上一些注解
@Entity (映射到数据库中的表)
@Searchable –> 这个注解把该类声明为搜索实体,映射到lucene中的document
Public class Product{
@Id (Hibernate用来表示实体的标识属性)
@SearchableId (compass标注为标识属性)
Private Integer id;
@Column()
@SearchableProperty à 映射搜索属性
Private String name;
}
3>利用compass api完成对实体的添/删/查操作
hibernate.cfg.xml / compass.cfg.xml 放在类路径下
hibernate: SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
Compass: Compass compass = new CompassConfiguration().configure().buildCompass();
SessionFactory == Compass
hibernate: Session session = sessionFactory.openSession();
compass: CompassSession session = compass.openSession();
Session = CompassSession
Hibernate: session.beginTransaction();
compass: session.beginTransaction();
Hibernate: session.save(product)/persist();
compass: session.save(product)/create();
Hibernate: session.getTransaction().commit();
compass: session.getTransaction().commit();
session.close();
sessionFactory.close();
学习一下compass映射注解:常用的就5个
@Searchable //告诉compass,将该类映射到lucene的Document
注意注解如果标注在属性上只能标注在get方法上面
@SearchableId //compass要求每个搜索实体类都要具有一个标识属性,这点和Hibernate相似
@SearchableProperty(index=Index.NOT_ANALYZED ,store=Store.YES)// store的默认值为Store.YES
类别id不需要分词,蛋需要索引并存储
Index。UN_TOKENIZED 不对该field进行分词,但是要索引,该属性已过时,建议产用NOT__ANALYZED替换
Index.TOKENIZED:先分词后索引。该属性已过时,建议采用ANALYZED替换
Inde.NOT_ANALYZED 不分词,但建立索引
Index.ANALYZED 分词并且建立索引
@SearchableId Property(boost=2)//boost的默认值为1,用户设置属性在索引中的重要性
如下:
@Searchable //告诉compass,将该类映射到Lucene的Document
public class Product {
private Integer id;
private String name;
private String content;
private Float price;
private String note;
private Integer position;
private Integer typeid;
public Product(){}
public Product(Integer id) {
this.id = id;
}
public Product(Integer id, String name, String content, Float price,String note,Integer typeid,Integer position) {
this.id = id;
this.name = name;
this.content = content;
this.price = price;
this.note = note;
this.typeid = typeid;
this.position = position;
}
@SearchableId //compass要求每个搜索实体类都要具有一个标识属性,这点和Hibernate相似
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
//类别id不需要分词,但需要索引并储存
//Index.UN_TOKENIZED:不对该Field进行分词,但是要索引.该属性已过时,建议采用NOT_ANALYZED替换
//Index.TOKENIZED:先分词后索引。该属性已过时,建议采用ANALYZED替换
//Index.NOT_ANALYZED:不分词,但建立索引
//Index.ANALYZED :分词并且建立索引
@SearchableComponent //关联的符合索引,专门用来标注复合类型
那么被标注的这个属性对应的类,我们也要标注一下为收索实体,但是这个搜索实体他不是单独存在的,他只是最为产品搜索实体的一部分
@Searchable(root=false)
@SearchableProperty(index=Index.NO ,store=Store.YES)
我们对他的主键不需要索引只需要存储
当你存在双向关系的时候,并且需要引用会对应的实体,反指引用
@SearchableReference
@SearchableProperty(index=Index.NOT_ANALYZED, store=Store.YES)//store的默认值为Store.YES
public Integer getTypeid() {
return typeid;
}
public void setTypeid(Integer typeid) {
this.typeid = typeid;
}
@SearchableProperty(boost=2)//boost的默认值为1,用于设置属性在索引中的重要性
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@SearchableProperty
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
//价格不需要进行搜索,但需要存储,如果没有存储,就需要从数据库中获取价格了
@SearchableProperty(index=Index.NO)//store的默认值为Store.YES
public Float getPrice() {
return price;
}
public void setPrice(Float price) {
this.price = price;
}
@SearchableProperty(store=Store.YES)
public String getNote() {
return note;
}
public void setNote(String note) {
this.note = note;
}
@SearchableProperty(index=Index.NOT_ANALYZED, store=Store.YES)//store的默认值为Store.YES
public Integer getPosition() {
return position;
}
public void setPosition(Integer position) {
this.position = position;
}
}
我们不集成spring的编程配置和使用方式如下:
import java.util.ArrayList;
import java.util.List;
import org.compass.annotations.config.CompassAnnotationsConfiguration;
import org.compass.core.Compass;
import org.compass.core.CompassException;
import org.compass.core.CompassHits;
import org.compass.core.CompassQueryBuilder;
import org.compass.core.CompassSession;
import org.compass.core.CompassTransaction;
import org.compass.core.CompassQuery.SortDirection;
import org.compass.core.CompassQuery.SortPropertyType;
import org.compass.core.config.CompassEnvironment;
import cn.itcast.bean.Product;
import cn.itcast.bean.QueryResult;
import cn.itcast.compass.service.ProductSearch;
public class ProductSearchBean implements ProductSearch {
private Compass compass = null;//-->SessionFactory
public ProductSearchBean(){
try {
//编程式配置
compass = new CompassAnnotationsConfiguration()
.setSetting(CompassEnvironment.CONNECTION, "[url=file://indexfile]file://indexfile[/url]")
//.setSetting(CompassEnvironment.CONNECTION, "ram://index")//在内存中建立索引
.setSetting("compass.engine.highlighter.default.formatter.simple.pre","<font color='red'>")
.setSetting("compass.engine.highlighter.default.formatter.simple.post","</font>")
.addScan("cn.itcast.bean").buildCompass();
} catch (Exception e) {
e.printStackTrace();
}
}
//compass支持增量索引,社会上很多公司,他们的产品都没有实现增量索引,1>lucene版本比较低,不支持增量索引,2>要增量索引,技术要求稍微有点高
//(晚上 2-3,定时器,把索引文件删除,重新生成索引)实时性不强,在索引文件更新的时候,用户是访问不了的
public void buildIndex(){
CompassSession session = null;
CompassTransaction tx = null;
try {
session = compass.openSession();
tx = session.beginTransaction();
Product p1 = new Product(12,"c瑜珈球","非常好的瑜珈球",12f, "www", 2, 12);
session.create(p1);
Product p2 = new Product(35,"b瑜珈球","天花板瑜珈球,good",42f, "mmm",2,9);
session.create(p2);
Product p3 = new Product(8,"a蓝球瑜珈球","蓝球小子",125f, "ppp",5,8);
session.create(p3);
tx.commit();
} catch (CompassException e) {
e.printStackTrace();
tx.rollback();
}finally{
if(session!=null && !session.isClosed()) session.close();
}
}
public void deleteIndex(Product product) {
CompassSession session = null;
CompassTransaction tx = null;
try {
session = compass.openSession();
tx = session.beginTransaction();
session.delete(product);
tx.commit();
} catch (CompassException e) {
e.printStackTrace();
tx.rollback();
}finally{
if(session!=null && !session.isClosed()) session.close();
}
}
public void updateIndex(Product product) {
CompassSession session = null;
CompassTransaction tx = null;
try {
session = compass.openSession();
tx = session.beginTransaction();
session.delete(product);
session.save(product);
tx.commit();
} catch (CompassException e) {
e.printStackTrace();
tx.rollback();
}finally{
if(session!=null && !session.isClosed()) session.close();
}
}
public void destroy(){
compass.close();
}
public QueryResult<Product> search(String keyword, int firstIndex, int maxResult) {
QueryResult<Product> qr = new QueryResult<Product>();
CompassSession session = null;
CompassTransaction tx = null;
try {
session = compass.openSession();
tx = session.beginTransaction();
//对所有索引Field进行搜索,你也可以指定对某个Field搜索,如:"name:jack",如果想指定多个字段可以用空格和"+"隔开如"name:jack +content:xxx"
CompassHits hits = session.find(keyword);
List<Product> products = new ArrayList<Product>();
int length = firstIndex+ maxResult;
if(length>hits.length()) length = hits.length();
for(int i=firstIndex; i<length; i++){
Product product = (Product)hits.data(i);
product.setContent(hits.highlighter(i).fragment("content"));
products.add(product);
}
qr.setResultlist(products);
qr.setTotalrecord(hits.length());
hits.close();
} catch (CompassException e) {
e.printStackTrace();
tx.rollback();
}finally{
if(session!=null && !session.isClosed()) session.close();
}
return qr;
}
public QueryResult<Product> search(String keyword, Integer typeid, int firstIndex, int maxResult) {
QueryResult<Product> qr = new QueryResult<Product>();
CompassSession session = null;
CompassTransaction tx = null;
try {
session = compass.openSession();
tx = session.beginTransaction();
//查询指定类别的匹配记录,并按position降序排序
CompassQueryBuilder queryBuilder = session.queryBuilder();
CompassHits hits = queryBuilder.bool()
.addMust(queryBuilder.spanEq("typeid", typeid))
.addMust(queryBuilder.queryString(keyword).toQuery())
.toQuery().addSort("position", SortPropertyType.FLOAT, SortDirection.REVERSE)
.hits();//sql: typeid=1 and (xxxx like ?) order by positoin desc
List<Product> products = new ArrayList<Product>();
int length = firstIndex+ maxResult;
if(length>hits.length()) length = hits.length();
for(int i=firstIndex; i<length; i++){
Product product = (Product)hits.data(i);
product.setContent(hits.highlighter(i).fragment("content"));
products.add(product);
}
qr.setResultlist(products);
qr.setTotalrecord(hits.length());
hits.close();
} catch (CompassException e) {
e.printStackTrace();
tx.rollback();
}finally{
if(session!=null && !session.isClosed()) session.close();
}
return qr;
}
}