ElasticSearch ---- 查詢
模擬數據建立正則表達式
首先利用head差檢查建立book索引緩存
而後修改mappings配置app
http方法: postelasticsearch
連接地址: http://192.168.253.129:9200/ book/novel/_mappingspost
{3d
"novel": {orm
"properties": {blog
"word_count": {排序
"type": "integer"索引
},
"author": {
"type": "keyword"
},
"title": {
"type": "text"
},
"publish_date": {
"type": "date",
"format": "yyyy-MM-dd HH:mm:ss || yyyy-MM-dd || epoch_millis"
}
}
}
}
數據插入
第一條數據
http方法: put
鏈接地址: http://192.168.253.129:9200/book/novel/1
請求參數
{
"author": "張三",
"title": "移魂大法",
"word_count": 1000,
"publish_date": "2000-10-01"
}
{
"author": "李三",
"title": "JAVA入門",
"word_count": 2000,
"publish_date": "2010-10-01"
}
{
"author": "張四",
"title": "Python入門",
"word_count": 2000,
"publish_date": "2005-10-01"
}
{
"author": "李四",
"title": "Elasticsearch大法好",
"word_count": 1000,
"publish_date": "2017-08-01"
}
{
"author": "王五",
"title": "菜譜",
"word_count": 5000,
"publish_date": "2002-10-01"
}
{
"author": "趙六",
"title": "劍譜",
"word_count": 10000,
"publish_date": "1997-01-01"
}
{
"author": "張三丰",
"title": "太極拳",
"word_count": 1000,
"publish_date": "1997-01-01"
}
{
"author": "瓦力",
"title": "Elasticsearch入門",
"word_count": 3000,
"publish_date": "2017-08-20"
}
{
"author": "很胖的瓦力",
"title": "Elasticsearch精通",
"word_count": 3000,
"publish_date": "2017-08-15"
}
{
"author": "牛魔王",
"title": "芭蕉扇",
"word_count": 1000,
"publish_date": "2000-10-01"
}
{
"author": "孫悟空",
"title": "七十二變",
"word_count": 1000,
"publish_date": "2000-10-01"
}
2.2.4.1 簡單查詢
http方法: GET
http地址: http://192.168.253.129:9200/book/novel/1
book: 索引名稱
novel: type名稱
1: 文檔id
2.2.4.2 條件查詢
http方法: POST
http地址: http://192.168.253.129:9200/book/novel/_search
查詢全部數據
{
"query": {
"match_all": {}
}
}
Query: 爲查詢關鍵字
添加起始條數和記錄數
{
"query": {
"match_all": {}
},
"from": 1,
"size": 1
}
關鍵詞查詢
{
"query": {
"match": {
"title": "Elasticsearch"
}
},
"sort": [
{
"publish_date": {
"order": "desc"
}
}
]
}
Match中爲匹配的字段和值
Sort中爲排序字段
2.2.4.3 聚合查詢
關鍵詞:aggs
http方法: POST
http地址: http://192.168.253.129:9200/book/novel/_search
{
"aggs": {
"group_by_word_count": {
"terms": {
"field": "word_count"
}
},
"group_by_publish_date": {
"terms": {
"field": "publish_date"
}
}
}
}
對指定的字段進行計算
{
"aggs": {
"grades_word_count": {
"stats": {
"field": "word_count"
}
}
}
}
2.2.5> 高級查詢
2.2.5.1子條件查詢-- Query context
特定字段查詢所指特定值
Query context
在查詢過程當中, 除了判斷文檔是否知足查詢條件以外, ES還會計算一個_score來標識匹配的程度, 旨在判斷目標文檔和查詢條件匹配的有多好.
Query context經常使用的查詢有全文本查詢和字段級別的查詢
1. 全文本查詢: 針對文本類型數據
1) 模糊匹配
http方法: post
http地址: http://192.168.253.129:9200/book/novel/_search
關鍵詞: query(查詢關鍵詞), match(模糊匹配關鍵詞)
請求參數:
{
"query": {
"match": {
"author": "瓦力"
}
}
}
或者
{
"query": {
"match": {
"title": "elasticsearch入門"
}
}
}
模糊匹配會把查詢的字段進行拆分, 如title中的」elasticsearch入門」, 會查詢」elasticsearch」和」入門」兩個詞語所匹配的內容
2) 習語匹配
http方法: post
http地址: http://192.168.253.129:9200/book/novel/_search
關鍵詞: query(查詢關鍵詞), match_phrase(習語匹配關鍵詞)
請求參數:
{
"query": {
"match_phrase": {
"title": "elasticsearch入門"
}
}
}
該查詢條件會將」title」字段中與」elasticsearch入門」相匹配的查出來
3) 多個字段的匹配查詢
http方法: post
http地址: http://192.168.253.129:9200/book/novel/_search
關鍵詞: query(查詢關鍵詞), muti_match(多字段匹配關鍵詞)
請求參數:
{
"query": {
"multi_match": {
"query": "瓦力",
"fields": [
"author",
"title"
]
}
}
}
該查詢條件會將」author」或者是」title」字段中包含」瓦力」的都查詢出來
4) 語法查詢(queryString)
支持通配符, 範圍查詢, 布爾查詢, 也能夠用在正則表達式中,
http方法: post
http地址: http://192.168.253.129:9200/book/novel/_search
關鍵詞: query(查詢關鍵詞), query_string(語法查詢關鍵詞)
請求參數
查詢」 elasticsearch」和」 大法」關鍵詞
{
"query": {
"query_string": {
"query": "elasticsearch AND 大法"
}
}
}
關鍵詞OR的使用
{
"query": {
"query_string": {
"query": "(elasticsearch AND 大法) OR Python"
}
}
}
指定字段和條件查詢
{
"query": {
"query_string": {
"query": "瓦力 OR Elasticsearch",
"fields": [
"author",
"title"
]
}
}
}
2. 字段級別的查詢: 針對結構化數據, 如數字, 日期等.
結構化數據的查詢
http方法: post
http地址: http://192.168.253.129:9200/book/novel/_search
關鍵詞: query(查詢關鍵詞), term(具體項關鍵詞)
查詢單詞數」word_count」爲1000的數據
{
"query": {
"term": {
"word_count": 1000
}
}
}
查詢字數範圍在1000-2000之間的圖書
關鍵詞: range, gte大於等於, lte小於等於
{
"query": {
"range": {
"word_count": {
"gte": 1000,
"lte": 2000
}
}
}
}
查詢出版日期是今年初到如今的書籍(now關鍵字表明如今時間)
{
"query": {
"range": {
"publish_date": {
"gte": "2017-01-01",
"lte": "now"
}
}
}
}
2.2.5.2 子條件查詢--Filter context
http方法: post
http地址: http://192.168.253.129:9200/book/novel/_search
關鍵詞: query(查詢關鍵詞), bool, filter
{
"query": {
"bool": {
"filter": {
"term": {
"word_count": 1000
}
}
}
}
}
Filter context相對於query context, 用於數據過濾, es會對其查詢結果緩存, 查詢速率會更快一些, filter要結合bool一塊兒使用.
2.2.5.3 複合條件查詢
以必定的邏輯組合子條件查詢
固定分數查詢
http方法: post
http地址: http://192.168.253.129:9200/_search (全文搜索)
關鍵詞: query(查詢關鍵詞), filter, boost關鍵詞, 固定分數
{
"query": {
"constant_score": {
"filter": {
"match": {
"title": "elasticsearch"
}
},
"boost": 2
}
}
}
固定了_score爲2. 而在模糊查詢中, _score爲變化的
布爾查詢
http方法: post
http地址: http://192.168.253.129:9200/_search (全文搜索)
關鍵詞: query(查詢關鍵詞), bool, should(應該知足), must(必須知足), must_not(必定不能知足的條件)
{
"query": {
"bool": {
"should": [
{
"match": {
"author": "瓦力"
}
},
{
"match": {
"title": "elasticsearch"
}
}
]
}
}
}
{
"query": {
"bool": {
"must": [
{
"match": {
"author": "瓦力"
}
},
{
"match": {
"title": "elasticsearch"
}
}
]
}
}
}
Bool和filter混合使用
{
"query": {
"bool": {
"must": [
{
"match": {
"author": "瓦力"
}
},
{
"match": {
"title": "elasticsearch"
}
}
],
"filter": [
{
"term": {
"word_count": 3000
}
}
]
}
}
}
Must_not的使用
{
"query": {
"bool": {
"must_not": {
"term": {
"author": "瓦力"
}
}
}
}
}
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