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mysql - How can I create an index on a substring of a text column?

I quite often need to filter records in a specific table on the basis of the existence of a substring in a text ... that can cope with the substring being anywhere in the string....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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js 数组追加对象出错

this.$store.state.playList.unshift({songname:this.$store.state.chosenList.songname,url:this.$store.state.songurl}) 数据是没问题的单独push 不是 ... this.$store.state.playList) 但是这样追加进数组出错为什么...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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SpringMVC中的@ModelAttribute注解是可有可无的吗？

在学习SpringMVC中的使用Controller接受表单的值，按照《Spring实战》中的代码，Controller如下： @RequestMapping(value = "/register", method = POST) public String ... 的功能？在这个例子中是不是即使不显示写也能有一样的功能？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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428 views

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spring+elasticsearch+ik如何配置?

spring+elasticsearch+ik如何配置，spring+elasticsearch是直接导包的嵌入的，网上的博客都是在本地的elasticsearch目录下操作然后重启elasticsearch服务，我现在是本地没有elasticsearch目录，elasticsearch只是在程序中，求做过的大神教一教?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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yeoman工作流的node_module的模块管理问题

1.对于目前的yeoman工作流的node_module分为2个，一个是给主入口index.js用的package.json,一个是给工作流模板用的package.json，目录结构如下 |-generator-xxx | |-app | | |-template ... 软连接过来这样的话我第1次用这个工作流的时候就只需要执行npm link就可以了 ...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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如何防止别人偷代码？

公司做的一个项目，直接被别人拔下来了。在我写的代码基础下直接修改。什么项目就不多说了。拔下来的是JS 和 html，后台代码是用的某框架所以只要拿html 和 JS 改改就能用了。 css js 都经过压缩了。请问大家有什么好的想法？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Unsupported major.minor version 52.0

Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) 使用的IDE是MyEclipse2015，用maven install 会发生编译失败，上网搜到的都是说jdk版本的问题，但是jdk和complier都是1.8的...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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739 views

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r - Formatting numbers with hugrex function in huxtable

Function huxreg in the huxtable package automatically recognises numbers and formats them as predefined in the number_format ... to character conversions with no success. Thanks!...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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262 views

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java - Customize Edittext and Button

I want to create edittext and button like this. I am not able to create the bottom shadow and round corner. please help me ... > <solid android:color="#F5F2F2" /> </shape> </item>...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Usage of React HOC for Functional Components

I was referring to the below link (section : HOCs for Functional Components) https://rossbulat.medium.com/how-to-use- ... What benefit do we really get out of creating this HOC?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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数据处理的问题（机器学习+数据处理+预测相关性）

最近遇到了一个数据处理的问题，没有什么思路特来提问，希望有高手路过，可以指点一二题目大概是这个样子的：有四个实体A B C D 每个实体都有上百个实例，比如A中有实例a1,a2....an 这些实例之间是有一定关系的，现在给 ... 可能存在关系的那些点，找出最有可能的前10个因为了解的算法并不多，希望高手可以详细说下，指明下研究的方向，谢谢啦！！...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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raku - How to declare a function that accepts a typed array parameter

Say I want to declare a function whose parameter is an array of strings: sub process-string-array(Str[] stringArray) # invalid { ... } How would I do that ?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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601 views

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在访问本地服务器目录下的html时，我的浏览器突然不能打开开发者工具，别的浏览器却可以

如图：点击右键找不到原来的菜单，变得好像ie,但是又没有ie那个检查元素...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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前端怎么展示这种类型的数据？

我的毕业设计是做一个教务管理系统网站，但是卡在了课表展示这里了。这是我的数据库字段设计，我主要是不知道前端怎么展示出来。比如编译技术这门课是周二第3到5节上课，然后在这个表格里面第3到5节里面就会显示编译技术这门课，但是一般表格是tr显示一行，我就不知道怎么把这个显示到纵向三行（3到5节）了。。...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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391 views

1 answer

python - Django filtering model on datetime with interger and datetime

I try to make a query to select all the object that where modified since a specified time This time is now - ... "max_schedule_delay", TimeField())) Any help is welcome, Thanks !...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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关于框架选用

想用java做一个监控平台，主要是在后台获取数据然后在前端用echarts的形式展示出来，数据的刷新是定时的，每个10分钟刷新一次，请问大神们后台选用什么框架和技术呢？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android APP冷启动时间过长，怎么解决？

android APP冷启动时间过长，怎么解决？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++链接错误，始终想不通

------------------- 文件 1.h ----------------------------------- #pragma once class A { public: static int x; public: void ... 法是二次编译（网上博文看来的）这个说法是不是错的，#pragma once到底是为了防止头文件被二次啥啥呢？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql同步数据到es有什么好的方法没？？

mysql同步数据到elasticsearch有什么好的方法没？？还是自己读取binlog自己处理。。...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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245 views

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c# - Error when idexing document in elastic search

I get this error from elastc: failed to parse date field [2020-12-30T23:00:00Z] with format [yyyy-MM-dd'T'HH:mm:ssZ] ... -dd'T'HH:mm:ssZ")) Any idea what could be causing this?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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560 views

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flutter - GetIt not registering dependencies

I am using GetIt (get_it: ^5.0.3) and have written a unit test to validate my usage. Each dependency is tested ... GetIt to no avail. I realize I am missing something fundamental....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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185 views

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linux怎么回到初始状态？？？

编译安装httpd的时候,参数写错了，httpd启动不了，所以用rpm -e httpd 命令把httpd卸载了，重新安装，但是总是报错，安装不了了。怎么回事？我想把系统还原到刚安装的状态去。...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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exe4j 打包 spring-boot 应用报错

java.lang.NoClassDefFoundError: BOOT-INF/classes/com/example/DemoApplication (wrong name: com/example/DemoApplication) at java.lang.ClassLoader. ... 还是本身这个程序就不能用 exe4j 打包吗...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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549 views

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c++ - Can I debug a C dll with a C# app within Visual Studio 2017?

I know it can be done with C++, but can't get it to work with C. We have a stand-alone hardware device ... to work. Is the C compiler not compatible with mixed mode debugging?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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525 views

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css - Make slide out up to icon img

I want to make icon img to slide out up any suggestions ? like social icons in this website : http://trydo.rainbowit.net/dark- ... ="facebook.svg" height="16px"></a></li> </div>...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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怎么使用 Lodash /Js 进行按对象字段分组处理

json对象 [ dictprovinceVOList[{ areaId: 13257 cityAreaList:[ { areaCode: "1853" areaId: 13265 areaList: firstLetter:"S" langType:"zh_CN" latitude ... ,"areaId": 372, ... }， {...} ] }...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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关于vue template预编译的问题

了解到vue的template是在运行时转换为render函数的，有没有办法在打包阶段预编译成render函数？如果可以的话，就可以去掉vue源码中的compile部分，进一步减小体积. 谢谢！...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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