ElastricSearch的parent_child的應用
ElasticSearch 這樣的分佈式系統中執行全 SQL 風格的鏈接查詢代價昂貴，是不可行的。相應地，爲了實現水平規模地擴展，ElasticSearch 提供了兩種形式的 join。html
一、nested query (嵌套查詢)json
文檔中可能包含嵌套類型的字段，這些字段用來索引一些數組對象，每一個對象均可以做爲一條獨立的文檔被查詢出來(用嵌套查詢)數組
二、has_child (有子查詢) and has_parent (有父查詢) queriesapp
類父子關係能夠存在單個的索引的兩個類型的文檔之間。has_child 查詢將返回其子文檔能知足特定的查詢的父文檔，而 has_parent 則返回其父文檔能知足特定查詢的子文檔分佈式
下面詳細的談談parent_child的應用：ui
實用場景：一個父存在多個子。例如一個班級有不少的學生。不建議是一個子存在多個父的這種狀況，例如一個學生多個班級。搜索引擎
理由是：父和子是綁定到同一個分片，若是一個子存在多個父的狀況，恰好這幾個parent_id在同一個分片時。只能寫進一條記錄。url
具體場景：spa
現有商店(做爲子)、活動(做爲父)，商店與門店的關係3d
爲了達到經過商店的過濾條件查詢活動的具體信息、經過活動的過濾條件查詢到商店的具體信息。
①：創建index_mapping
PUT _template/act_shop
{
"order": 0,
"template": "act_shop-*",
"settings": {
"index": {
"mapping": {
"total_fields": {
"limit": "50000"
}
},
"number_of_shards": "150",
"number_of_replicas": "1",
"refresh_interval": "1s"
}
},
"mappings": {
"shop": {
"_parent": {
"type": "act"
},
"properties": {
"end_date": {
"format": "yyyy-MM-dd",
"type": "date"
},
"update_time": {
"format": "yyyy-MM-dd HH:mm:ss.SSSSSS",
"type": "date"
},
"coordinate": {
"type": "geo_point"
},
"create_time": {
"format": "yyyy-MM-dd HH:mm:ss.SSSSSS",
"type": "date"
},
"start_date": {
"format": "yyyy-MM-dd",
"type": "date"
}
}
},
"act": {
"properties": {
"end_date": {
"format": "yyyy-MM-dd",
"type": "date"
},
"update_time": {
"format": "yyyy-MM-dd HH:mm:ss.SSSSSS",
"type": "date"
},
"create_time": {
"format": "yyyy-MM-dd HH:mm:ss.SSSSSS",
"type": "date"
},
"start_date": {
"format": "yyyy-MM-dd",
"type": "date"
}
}
}
},
"aliases": {}
}
②商店的數據(shop)
PUT act_shop-2018.01.08/shop/181023?parent=266773
{
"status": 0,
"city": {
"id": 3619,
"name": "南山區"
},
"update_time": "2017-12-20 16:03:19.650000",
"tel": [],
"name": "百果園(白石中路1店)",
"tags": [
"購物服務",
"綜合市場",
"果品市場"
],
"tags_enrich": {
"name": "超市網購",
"id": 20
},
"id": 181023,
"label": "have_act",
"create_time": "2016-12-20 14:25:24.402000",
"city_enrich": {
"region": "華南地區",
"name": "深圳",
"level": 1
},
"address": "紅樹街130號",
"coordinate": {
"lat": 22.531311,
"lon": 113.967413
},
"brand": {
"id": 22320,
"name": "百果園"
}
}
PUT act_shop-2018.01.08/shop/181023?parent=36525
{
"status": 0,
"city": {
"id": 3619,
"name": "南山區"
},
"update_time": "2017-12-20 16:03:19.650000",
"tel": [],
"name": "百果園(白石中路1店)",
"tags": [
"購物服務",
"綜合市場",
"果品市場"
],
"tags_enrich": {
"name": "超市網購",
"id": 20
},
"id": 181023,
"label": "have_act",
"create_time": "2016-12-20 14:25:24.402000",
"city_enrich": {
"region": "華南地區",
"name": "深圳",
"level": 1
},
"address": "紅樹街130號",
"coordinate": {
"lat": 22.531311,
"lon": 113.967413
},
"brand": {
"id": 22320,
"name": "百果園"
}
}
③活動的信息(act)
PUT act_shop-2018.01.08/act/266773
{
"zone_exclude_id": [],
"create_time": "2017-12-15 10:16:28.937000",
"id": 266773,
"subject": {
"type": 2,
"name": "card_org"
},
"category": [
{
"name_en": "",
"id": 286,
"name": "其餘購物"
}
],
"special_dates": [],
"original_url": "http://static.95516.com/static/page/yhfwb/zhenghe/activity-page/bgy.html",
"special_weekdays": [],
"content": """
##### 參與方式
- 至「百果園」指定門店銀聯手機閃付享優惠
##### 活動內容
- 活動期間，**每週六 7:00-23:00 **銀聯（62 開頭）信用卡持卡人至「百果園」指定門店銀聯手機閃付享滿 50 立減 10 元優惠
##### 注意事項
- 每人每活動日限享 1 次優惠
- 消費券、提貨券、儲值卡等儲值類商品除外
""",
"usage_scene": [],
"start_date": "2017-12-15",
"status": 1,
"subject_description": "銀聯（62 開頭）信用卡持卡人",
"update_time": "2017-12-15 10:21:45.321000",
"card_orgs": [
{
"id": 6,
"name": "銀聯"
}
],
"end_date": "2018-03-31",
"receive_description": "",
"unavailable_time_ranges": [],
"quota": "每活動日共計 1.5 萬名",
"zone_include": [
"中國"
],
"discount": [
{
"name_en": "decrease_price",
"id": 19,
"name": "立減"
}
],
"category_enrich": {
"name": "超市網購",
"id": 20
},
"act_area": null,
"content_enrich": {
"參與方式": [
" 至「百果園」指定門店銀聯手機閃付享優惠"
],
"活動內容": [
" 活動期間，每週六 7:00-23:00 銀聯（62 開頭）信用卡持卡人至「百果園」指定門店銀聯手機閃付享滿 50 立減 10 元優惠"
],
"注意事項": [
" 每人每活動日限享 1 次優惠",
" 消費券、提貨券、儲值卡等儲值類商品除外"
]
},
"payment": [
{
"name_en": "",
"id": 168,
"name": "Mipay"
},
{
"name_en": "",
"id": 164,
"name": "ApplePay"
},
{
"name_en": "",
"id": 166,
"name": "SamsungPay"
},
{
"name_en": "",
"id": 167,
"name": "HuaweiPay"
}
],
"small_img_url": null,
"act_type": 1,
"zone_include_id": [
24
],
"title": "百果園滿 50 減 10",
"original_title": "銀聯百果惠",
"display_tags": [],
"big_img_url": "https://qnpic.billbear.cn/FsIX719_Qt-E-6BRXiHxDc0FKIUU",
"available_time_ranges": [
{
"range_type": 2,
"start_time": 25200,
"end_time": 82800,
"weekday": 5,
"day": null
}
],
"zone_exclude": [],
"banks": [],
"is_hot": 0,
"money_limit": null
}
PUT act_shop-2018.01.08/act/266773
{
"zone_exclude_id": [],
"create_time": "2017-02-10 13:38:36.525000",
"id": 36525,
"subject": {
"type": 2,
"name": "card_org"
},
"category": [
{
"name_en": "other_food",
"id": 55,
"name": "其餘美食"
},
{
"name_en": "takeaway",
"id": 54,
"name": "外賣"
}
],
"special_dates": [],
"original_url": "https://mp.weixin.qq.com/s?__biz=MjM5NDg0Mzc5NA==&mid=2659803252&idx=4&sn=57a5e54a276f96894d73c1be59219285&chksm=bdfc5d898a8bd49f7120eaf51c189205f1a340297ab7b273bf939243447a92348e0ad58543d9&scene=0&key=acee276fe32414514538a1541ce00d3087fa9d92fb1e09e7486d463a96b50e8f35d2ea7707f24e1d148c33859f682c5a5cc1016605a8fd0386068a4f86b4968718e6713fe15329127fdbec5f6931c804&ascene=0&uin=NzQxMjgxMDAw&devicetype=iMac+MacBook9%2C1+OSX+OSX+10.12.3+build(16D32)&version=12010310&nettype=WIFI&fontScale=100&pass_ticket=pAmyZjgFDOjHEWa2GXWD4fLvbHJwLBH6wg3KUTG9su5Cyr%2FI9lATheHMruFwTaim",
"special_weekdays": [],
"content": """
##### 活動內容
1. 銀聯持卡人（卡號以 62 開頭）在**深圳地區**的「百果園」消費，享立減優惠
2. **手機雲閃付**支付消費，單筆滿 50 元減 20 元
3. **IC 信用卡閃付**支付消費，單筆滿 50 元減 10 元
""",
"usage_scene": [
{
"name_en": "food",
"id": 2,
"name": "餐飲"
}
],
"start_date": "2017-02-14",
"status": 0,
"subject_description": null,
"update_time": "2017-06-07 14:48:18.952000",
"card_orgs": [
{
"id": 6,
"name": "銀聯"
}
],
"end_date": "2017-05-31",
"receive_description": "",
"unavailable_time_ranges": [],
"quota": null,
"zone_include": [
"中國"
],
"discount": [
{
"name_en": "decrease_price",
"id": 19,
"name": "立減"
}
],
"category_enrich": {
"name": "美食",
"id": 10
},
"act_area": {
"name_en": "mainland",
"id": 34,
"name": "大陸"
},
"content_enrich": {
"活動內容": [
" 銀聯持卡人（卡號以 62 開頭）在深圳地區的「百果園」消費，享立減優惠",
" 手機雲閃付支付消費，單筆滿 50 元減 20 元",
" IC 信用卡閃付支付消費，單筆滿 50 元減 10 元"
]
},
"payment": [],
"small_img_url": null,
"act_type": 3,
"zone_include_id": [
24
],
"title": "百果園滿 50 減 20",
"original_title": "過來，教你如何在廣深每週最高勁省140元！ ",
"display_tags": [],
"big_img_url": "https://qnpic.billbear.cn/Fj-nrXp6IYFMbJhGDzx8n3Jy9rxr",
"available_time_ranges": [
{
"range_type": 2,
"start_time": 0,
"weekday": 5,
"day": null,
"end_time": 86400
},
{
"range_type": 2,
"start_time": 0,
"weekday": 1,
"day": null,
"end_time": 86400
}
],
"zone_exclude": [],
"banks": [],
"is_hot": 1,
"money_limit": null
}
③雙向查詢
一、經過商店查詢到活動
GET act_shop-2018.01.08/_search
{
"query": {
"has_child": {
"type": "shop",
"query": {
"bool": {
"must": [
{
"term": {
"name.keyword": {
"value": "百果園(白石中路1店)"
}
}
}
]
}
}
}
}
}
二、經過活動能夠查詢到相應的商戶
GET act_shop-2018.01.08/_search
{
"size": 400,
"query": {
"has_parent": {
"parent_type": "act",
"query": {
"bool": {
"must": [
{
"term": {
"title.keyword": {
"value": "百果園滿 50 減 10"
}
}
}
]
}
}
}
}
}
總結：ElastricSearch是一個很是強大的搜索引擎。本版本是5.5.2.其中新出6.0.0版本開始廢棄type。有興趣的話能夠看一下官網的文檔。
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