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laohanjianshen 585dc0608e 新官网
2022-06-28 21:35:06 +08:00

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(window.webpackJsonp=window.webpackJsonp||[]).push([[26],{348: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("div",{staticClass:"custom-block tip"},[a("p",{staticClass:"custom-block-title"},[s._v("前言")]),s._v(" "),a("p",[s._v("聚合可以算得上ES中最难用的一部分了，其API也是最反人类的，懂的都懂。对聚合的支持，SpringData-ElasticSearch直接放弃了，EE对其ES的聚合的简化也比较有限，尽管如此，也算得上目前市面上开源框架中对ES聚合支持得最好的框架了，大家在用得时候请轻喷，在聚合方式排列组合有上千种，以及灵活多变的树形桶得数据解析上，我们真的尽力了，奉劝大家抛弃幻想，准备迎接挑战，这不是MySQL。ES的聚合和MySQL的聚合完全是两种不同的东西。\n您现在看到的聚合也绝对不是EE对聚合支持的最终形态，我们还会持续探索进一步简化聚合，来减轻用户使用ES聚合功能的烦恼。")])]),s._v(" "),a("h2",{attrs:{id:"常规聚合"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#常规聚合"}},[s._v("#")]),s._v(" 常规聚合")]),s._v(" "),a("p",[s._v("在MySQL中,我们可以通过指定字段进行group by聚合,EE同样也支持类似聚合:")]),s._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[s._v(" 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("h2",{attrs:{id:"其它聚合"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#其它聚合"}},[s._v("#")]),s._v(" 其它聚合:")]),s._v(" "),a("div",{staticClass:"language-json line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-json"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 求最小值")]),s._v("\nwrapper.min();\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 求最大值")]),s._v("\nwrapper.max();\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 求平均值")]),s._v("\nwrapper.avg();\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 求和")]),s._v("\nwrapper.sum();\n")])]),s._v(" 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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("span",{staticClass:"line-number"},[s._v("11")]),a("br")])]),a("blockquote",[a("p",[s._v("另外EE还提供了可以配置是否开启管道聚合的参数,默认为开启,如果你想让多个字段聚合的结果出现在各自的桶中,那么你可以指定enablePipeline参数为false即可.")])]),s._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[s._v(" "),a("span",{pre:!0,attrs:{class:"token annotation punctuation"}},[s._v("@Test")]),s._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("public")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("void")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[s._v("testAggNotPipeline")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 对于下面两个字段,如果不想以pipeline管道聚合,各自聚合的结果在各自的桶中展示的话,我们也提供了支持")]),s._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("LambdaEsQueryWrapper")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("Document")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v(" wrapper 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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("h2",{attrs:{id:"去重聚合"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#去重聚合"}},[s._v("#")]),s._v(" 去重聚合")]),s._v(" "),a("blockquote",[a("p",[s._v("为了方便用户去重,我们针对字段的去重提供了极为友好的方式,解决用户根据字段进行去重及分页要写大量代码来实现的烦恼,使用ee单字段去重仅需1行即可搞定!")])]),s._v(" "),a("p",[s._v("API:")]),s._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[s._v(" "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 去重,入参为去重列")]),s._v("\n wrapper"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[s._v("distinct")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("R")]),s._v(" column"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n")])]),s._v(" "),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("p",[s._v("下面我用一段代码来演示根据指定字段去重:")]),s._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[s._v(" "),a("span",{pre:!0,attrs:{class:"token annotation punctuation"}},[s._v("@Test")]),s._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("public")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("void")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token function"}},[s._v("testDistinct")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("{")]),s._v("\n "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 查询所有标题为老汉的文档,根据创建者去重,并分页返回")]),s._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("LambdaEsQueryWrapper")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("Document")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),s._v(" wrapper "),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 class-name"}},[s._v("LambdaEsQueryWrapper")]),a("span",{pre:!0,attrs:{class:"token generics"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("<")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(">")])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n wrapper"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[s._v("eq")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("Document")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("::")]),a("span",{pre:!0,attrs:{class:"token function"}},[s._v("getTitle")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),s._v(" documentMapper"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[s._v("pageQuery")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("wrapper"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(",")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("10")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(";")]),s._v("\n "),a("span",{pre:!0,attrs:{class:"token class-name"}},[s._v("System")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("out"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),a("span",{pre:!0,attrs:{class:"token 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tip"},[a("p",{staticClass:"custom-block-title"},[s._v("坏味道")]),s._v(" "),a("p",[s._v("对于多字段的去重支持，没有上述这么简单，因为多字段去重无法通过折叠去实现,数据会被置入桶中返回,桶中数据的解析,需要哪些字段,排序规则,覆盖规则是怎样的过于灵活,我们无法通过框架来帮用户屏蔽这些,市面上目前也无任何框架能够支撑，因此,我们对多字段的去重仅支持到了查询条件的封装,数据解析部分需用户自行完成,敬请谅解.好在多字段去重的场景并不是太多,用户如果有用到多字段去重，可参见本篇开头对groupBy的介绍，可通过groupBy对多字段实现去重。")])])])}),[],!1,null,null,null);t.default=e.exports}}]);
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