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easy-es/dist/assets/js/18.85a6012d.js
laohanjianshen 585dc0608e 新官网
2022-06-28 21:35:06 +08:00

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(window.webpackJsonp=window.webpackJsonp||[]).push([[18],{336:function(s,t,a){"use strict";a.r(t);var n=a(6),e=Object(n.a)({},(function(){var s=this,t=s.$createElement,a=s._self._c||t;return a("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[a("h2",{attrs:{id:"何为混合查询"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#何为混合查询"}},[s._v("#")]),s._v(" 何为混合查询?")]),s._v(" "),a("p",[s._v('简单理解,就是一半采用EE的语法,一半采用RestHighLevelClient的语法,类似"油电混动",相信你会爱上这种"油电混动"模式,因为它结合了两种模式的优点!')]),s._v(" "),a("h2",{attrs:{id:"为什么要有混合查询"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#为什么要有混合查询"}},[s._v("#")]),s._v(" 为什么要有混合查询?")]),s._v(" "),a("p",[s._v("因为EE目前还没有做到对RestHighLevelClient的功能100%覆盖,目前开源初期,仅覆盖了RestHighLevelClient约90%左右的功能,99%的核心高频使用功能,如此就不可避免的会出现个别场景下,EE不能满足某个特殊需求,此时对EE框架进行二次开发或直接将该需求提给EE作者,在时间上都无法满足开发者需求,有些需求可能产品经理要的比较紧,那么此时,您就可以通过混合查询来解决窘境.")]),s._v(" "),a("h2",{attrs:{id:"如何使用混合查询"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#如何使用混合查询"}},[s._v("#")]),s._v(" 如何使用混合查询?")]),s._v(" "),a("p",[s._v("在我没提供此篇文档时,尽管我提供了混合查询的API和简单介绍,但很多人还不知道有此功能,更不知道该如何使用,所以这里我以一个具体的案例,给大家演示如何使用混合查询,供大家参考,主公们别担心篇幅多,其实非常非常简单,只是我教程写的细.")]),s._v(" "),a("div",{staticClass:"custom-block tip"},[a("p",{staticClass:"custom-block-title"},[s._v("背景")]),s._v(" "),a("p",[s._v('用户"向阳"微信向我反馈,说目前EE尚不支持查询按照距给定点的位置由近及远排序.\n实际开发中,此场景可以被应用到打车时"乘客下单,要求优先派单给周围3公里内离我最近的司机",然后该乘客是个美女,担心自身安全问题,又多加了几个要求,比如司机必须是女性,驾龄大于3年,商务型车子等...')])]),s._v(" "),a("p",[s._v("以上面打车的场景为例,我们来看下用EE怎么查询?上面查询可以分为两部分")]),s._v(" "),a("ul",[a("li",[s._v("EE支持的常规查询:如周围3公里内,司机性别为女,查询驾龄>=3年...")]),s._v(" "),a("li",[s._v("EE不支持的非常规查询:按照复杂的排序规则排序(写此篇文档时是不支持的,现已支持,但这不重要,本篇仅以此来演示混合查询的使用)")])]),s._v(" "),a("p",[s._v("对于支持的部分,我们可以直接调用EE,由EE先构建一个SearchSourceBuilder出来")]),s._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 假设该乘客所在位置经纬度为 31.256224D, 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br")])]),a("p",[s._v("对于不支持的语句,可以继续用RestHighLevelClient的语法进行封装,封装好了,直接调用EE提供的原生查询接口,就可以完成整个查询.")]),s._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[a("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("SearchRequest")]),s._v(" searchRequest "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("new")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br"),a("span",{staticClass:"line-number"},[s._v("8")]),a("br"),a("span",{staticClass:"line-number"},[s._v("9")]),a("br"),a("span",{staticClass:"line-number"},[s._v("10")]),a("br")])]),a("p",[s._v("如此您便可以既享受到了EE帮您生成好的基本查询,又可完成EE暂未支持的功能,只需要不太多的代码(相比直接RestHighLevelClient,仍能节省大量代码)就可以达成您的目标,和当下纯电动汽车尚未完全发展成熟下的一种折中方案---油电混动有着异曲同工之妙.")]),s._v(" "),a("p",[s._v("当然,如果您不习惯使用这种模式,您仍可以直接使用原生查询,所以您大可以无忧无虑的使用EE,我们已经为您想好了各种兜底的方案和退路,无忧售后!如果您也认可这种模式,不妨给作者点个赞吧,为了让EE的用户爽,作者那糟老头子可谓是煞费苦心!")]),s._v(" "),a("h2",{attrs:{id:"结语"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#结语"}},[s._v("#")]),s._v(" 结语")]),s._v(" "),a("p",[s._v("因为ES官方提供的RestHighLevel支持的功能实在是过于繁多,尽管我目前仍在马不停蹄的集成各种新的功能,以及修复用户反馈的问题,优化既有代码性能,但仍不可避免地会出现有些许功能不能满足您当前需求,请各位主公们见谅,EE才诞生三个月,不可能做到十全十美,请给我们一点时间,这些所谓的不足,都会被解决,就像新能源车在未来终会逐步取代燃油车,那些所谓的问题,在未来都不是问题,乌拉!")])])}),[],!1,null,null,null);t.default=e.exports}}]);
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