Spring data elasticsearch使用方法详解

2023-08-02 14:25:03 62

这篇文章主要介绍了Springdataelasticsearch使用方法详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

一、准备

1.添加依赖


org.springframework.boot
spring-boot-starter-data-elasticsearch

2.application.yml

spring:
application:
name:search-service
data:
elasticsearch:
cluster-name:elasticsearch
cluster-nodes:192.168.25.129:9300

3.实体类

@Data
@Document(indexName="goods",type="_doc",shards=1,replicas=0)
publicclassGoods{
@IdprivateLongid;
@Field(type=FieldType.text,analyzer="ik_max_word")
privateStringall;
@Field(type=FieldType.keyword,index=false)
privateStringsubTitle;privateLongbrandId;privateLongcid1;privateLongcid2;privateLongcid3;privateDatecreateTime;privateListprice;
@Field(type=FieldType.keyword,index=false)
privateStringskus;privateMapspecs;
}

@Document作用在类，标记实体类为文档对象，一般有两个属性

indexName：对应索引库名称
type：对应在索引库中的类型
shards：分片数量，默认5
replicas：副本数量，默认1
@Id作用在成员变量，标记一个字段作为id主键
@Field作用在成员变量，标记为文档的字段，并指定字段映射属性：
type：字段类型，取值是枚举：FieldType
index：是否索引，布尔类型，默认是true
store：是否存储，布尔类型，默认是false
analyzer：分词器名称

二.、索引操作

首先注入ElasticsearchTemplate

@Resource
privateElasticsearchTemplateelasticsearchTemplate;

●创建索引

elasticsearchTemplate.createIndex(Goods.class);

●配置映射

elasticsearchTemplate.putMapping(Goods.class);

●删除索引

//根据类
elasticsearchTemplate.deleteIndex(Goods.class);
//根据索引名
elasticsearchTemplate.deleteIndex("goods");

三、文档操作

1.定义接口。也是SpringData风格

publicinterfaceItemRepositoryextendsElasticsearchRepository{
}

2.注入

@Autowired
privateItemRepositoryitemRepository;

●新增文档

Itemitem=newItem(1L,"小米手机7","手机",
"小米",3499.00,"http://image.leyou.com/13123.jpg");
itemRepository.save(item);

●批量新增

Listlist=newArrayList<>();
list.add(newItem(2L,"坚果手机R1","手机","锤子",3699.00,"http://image.leyou.com/123.jpg"));
list.add(newItem(3L,"华为META10","手机","华为",4499.00,"http://image.leyou.com/3.jpg"));
//接收对象集合，实现批量新增
itemRepository.saveAll(list);

四、基本搜索

●基本查询。

例：

//查询全部，并安装价格降序排序
Iterableitems=this.itemRepository.findAll(Sort.by(Sort.Direction.DESC,"price"));
items.forEach(item->System.out.println(item));

●自定义查询

Keyword	Sample	ElasticsearchQueryString
And	findByNameAndPrice	{"bool":{"must":[{"field":{"name":"?"}},{"field":{"price":"?"}}]}}
Or	findByNameOrPrice	{"bool":{"should":[{"field":{"name":"?"}},{"field":{"price":"?"}}]}}
Is	findByName	{"bool":{"must":{"field":{"name":"?"}}}}
Not	findByNameNot	{"bool":{"must_not":{"field":{"name":"?"}}}}
Between	findByPriceBetween	{"bool":{"must":{"range":{"price":{"from":?,"to":?,"include_lower":true,"include_upper":true}}}}}
LessThanEqual	findByPriceLessThan	{"bool":{"must":{"range":{"price":{"from":null,"to":?,"include_lower":true,"include_upper":true}}}}}
GreaterThanEqual	findByPriceGreaterThan	{"bool":{"must":{"range":{"price":{"from":?,"to":null,"include_lower":true,"include_upper":true}}}}}
Before	findByPriceBefore	{"bool":{"must":{"range":{"price":{"from":null,"to":?,"include_lower":true,"include_upper":true}}}}}
After	findByPriceAfter	{"bool":{"must":{"range":{"price":{"from":?,"to":null,"include_lower":true,"include_upper":true}}}}}
Like	findByNameLike	{"bool":{"must":{"field":{"name":{"query":"?*","analyze_wildcard":true}}}}}
StartingWith	findByNameStartingWith	{"bool":{"must":{"field":{"name":{"query":"?*","analyze_wildcard":true}}}}}
EndingWith	findByNameEndingWith	{"bool":{"must":{"field":{"name":{"query":"*?","analyze_wildcard":true}}}}}
Contains/Containing	findByNameContaining	{"bool":{"must":{"field":{"name":{"query":"?","analyze_wildcard":true}}}}}
In	findByNameIn(Collectionnames)	{"bool":{"must":{"bool":{"should":[{"field":{"name":"?"}},{"field":{"name":"?"}}]}}}}
NotIn	findByNameNotIn(Collectionnames)	{"bool":{"must_not":{"bool":{"should":{"field":{"name":"?"}}}}}}
Near	findByStoreNear	NotSupportedYet!
True	findByAvailableTrue	{"bool":{"must":{"field":{"available":true}}}}
False	findByAvailableFalse	{"bool":{"must":{"field":{"available":false}}}}
OrderBy	findByAvailableTrueOrderByNameDesc	{"sort":[{"name":{"order":"desc"}}],"bool":{"must":{"field":{"available":true}}}}

例：

publicinterfaceItemRepositoryextendsElasticsearchRepository{

/**
*根据价格区间查询
*@paramprice1
*@paramprice2
*@return
*/
ListfindByPriceBetween(doubleprice1,doubleprice2);
}

五、高级查询

●词条查询

MatchQueryBuilderqueryBuilder=QueryBuilders.matchQuery("all","小米");
//执行查询
Iterablegoods=this.goodsRepository.search(queryBuilder);

●自定义查询

//构建查询条件
NativeSearchQueryBuilderqueryBuilder=newNativeSearchQueryBuilder();
//添加基本的分词查询
queryBuilder.withQuery(QueryBuilders.matchQuery("all","小米"));
//执行搜索，获取结果
Pagegoods=this.goodsRepository.search(queryBuilder.build());
//打印总条数
System.out.println(goods.getTotalElements());
//打印总页数
System.out.println(goods.getTotalPages());

●分页查询

//构建查询条件
NativeSearchQueryBuilderqueryBuilder=newNativeSearchQueryBuilder();
//添加基本的分词查询
queryBuilder.withQuery(QueryBuilders.termQuery("all","手机"));

//初始化分页参数
intpage=0;
intsize=3;
//设置分页参数
queryBuilder.withPageable(PageRequest.of(page,size));

//执行搜索，获取结果
Pagegoods=this.goodsRepository.search(queryBuilder.build());
//打印总条数
System.out.println(goods.getTotalElements());
//打印总页数
System.out.println(goods.getTotalPages());
//每页大小
System.out.println(goods.getSize());
//当前页
System.out.println(goods.getNumber());

●排序

//构建查询条件
NativeSearchQueryBuilderqueryBuilder=newNativeSearchQueryBuilder();
//添加基本的分词查询
queryBuilder.withQuery(QueryBuilders.termQuery("all","手机"));

//排序
queryBuilder.withSort(SortBuilders.fieldSort("price").order(SortOrder.DESC));

//执行搜索，获取结果
Pagegoods=this.goodsRepository.search(queryBuilder.build());
//打印总条数
System.out.println(goods.getTotalElements());

●聚合为桶

NativeSearchQueryBuilderqueryBuilder=newNativeSearchQueryBuilder();
//不查询任何结果
queryBuilder.withSourceFilter(newFetchSourceFilter(newString[]{""},null));
//1、添加一个新的聚合，聚合类型为terms，聚合名称为brands，聚合字段为brand
queryBuilder.addAggregation(AggregationBuilders.terms("brands").field("brandId"));
//2、查询,需要把结果强转为AggregatedPage类型
AggregatedPageaggPage=(AggregatedPage)this.goodsRepository.search(queryBuilder.build());
//3、解析
//3.1、从结果中取出名为brands的那个聚合，
//因为是利用String类型字段来进行的term聚合，所以结果要强转为StringTerm类型
LongTermsagg=(LongTerms)aggPage.getAggregation("brands");
//3.2、获取桶
Listbuckets=agg.getBuckets();
//3.3、遍历
for(LongTerms.Bucketbucket:buckets){
//3.4、获取桶中的key，即品牌名称
System.out.println(bucket.getKeyAsString());
//3.5、获取桶中的文档数量
System.out.println(bucket.getDocCount());
}

●嵌套聚合，求平均值

NativeSearchQueryBuilderqueryBuilder=newNativeSearchQueryBuilder();
//不查询任何结果
queryBuilder.withSourceFilter(newFetchSourceFilter(newString[]{""},null));
//1、添加一个新的聚合，聚合类型为terms，聚合名称为brands，聚合字段为brand
queryBuilder.addAggregation(AggregationBuilders.terms("brands").field("brandId")
.subAggregation(AggregationBuilders.avg("priceAvg").field("price")));//在品牌聚合桶内进行嵌套聚合，求平均值
//2、查询,需要把结果强转为AggregatedPage类型
AggregatedPageaggPage=(AggregatedPage)this.goodsRepository.search(queryBuilder.build());
//3、解析
//3.1、从结果中取出名为brands的那个聚合，
//因为是利用String类型字段来进行的term聚合，所以结果要强转为StringTerm类型
LongTermsagg=(LongTerms)aggPage.getAggregation("brands");
//3.2、获取桶
Listbuckets=agg.getBuckets();
//3.3、遍历
for(LongTerms.Bucketbucket:buckets){
//3.4、获取桶中的key，即品牌名称3.5、获取桶中的文档数量
System.out.println(bucket.getKeyAsString()+"，共"+bucket.getDocCount()+"台");

//3.6.获取子聚合结果：
InternalAvgavg=(InternalAvg)bucket.getAggregations().asMap().get("priceAvg");
System.out.println("平均售价："+avg.getValue());
}

附：配置搜索结果不显示为null字段：

spring:
jackson:
default-property-inclusion:non_null#配置json处理时忽略空值

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

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Spring data elasticsearch使用方法详解

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