Recent questions in Technique[技术]

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MySQL :: COUNT(DISTINCT) + GROUP BY 查询优化问题

在写项目过程中，我在类似数据汇总的模块中发现一个SQL执行缓慢，它包含了一些分组+去重+求和的操作，我使用派生表对这个SQL进行了一些改进，查询速度在20W记 ... where adcode like '35%' GROUP BY device_id ) t group by area ORDER BY NULL EXPLAIN结果...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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415 views

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uni-app怎么把一个div生成图片分享到微信

如题uni-app怎么把一个div生成图片分享到微信...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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327 views

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2020年推荐免费图床

请问大神有甚么推荐的免费图床吗? 或是每个月费一点费用的,预算每个月20$ (我很穷 T_T) 或是有推荐自架图床方式。更新 : 请问 github 当图床建议吗? 担心被墙...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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684 views

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按需引入elementui 主题颜色修改不了

elementui是按需引入的，它的js和css是在路由懒加载时加载的，所以导致动态换肤的主题样式chalk-style会被按需引入的组件默认样式给覆盖。...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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462 views

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vuejs2 - Authenticate Vue with WebAPI using AzureAD

I am trying to query the data from AzureAD protected WebAPI from Vue using vue-msal. WebApi: 58ca819e- is webapi app id ... is used? Can we ask the access token for >1 scopes?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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565 views

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angular - Why am I getting Error: Timeout in my Jasmine unit test of http interceptor?

I am struggling with unit testing my interceptor since yesterday noon. After following several tutorial and SO answers, I have a code ... ?id=' + id; return this.http.get(url); }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java try with resource 难受

之前把 try 都改成了 java try with resource 形式现在有新需求，发现无法实现，难道又要改回来？ try( Handler api = getHandler() ) { // 做点啥 api.getState(); ... 下多做一点操作， java try with resource 形式是不是就没法写了？？？那也太鸡肋了 ...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JMS Dynamic Message Selection

I have a message queue containing a customer id and some of their data. To improve performance those messages will be ... noting I'm currently using RabbitMQ but this is flexible....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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273 views

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java - Quarkus: Inject config properties into service class doesn't work

I have some trouble injecting a config class into a service class in Quarkus. I have this config class: import ... (TestConfig config) { Thanks to Luca for the idea....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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571 views

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vscode项目eslint检测弹框关闭后怎么重新打开

vscode第一次打开某个vue项目会弹框询问是否使用eslint检测，选择了不允许的按钮后这个弹框就不再出现了，请问这个弹框再怎么打开啊，想开启eslint检测就是下面的弹框，手误点了do not allow：...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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634 views

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pdf.js 'GlobalWorkerOptions' of undefined

用的是pdf.js,引用如下 pdfjsLib输出为undefined 版本 "pdfjs-dist": "^2.2.228"...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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406 views

1 answer

Unable to show QR Image of specific size and data in Crystal Report

I'm working with Crystal ... -O9YXfvSOq0cYgzb3IIa6OKC-IKea0TlppZ1aRUutARvxEkzfCROuRksGquDjA...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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为什么在android设备内部存储上看不到有些app的包文件?

一般而言, android 设备在内部存储/Android/data/ 这个路径下, 都有跟应用包名相关的文件夹目录, 为什么同一个设备, 有些app有, 而有些app没有呢?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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用sql语句怎么让结果集直接生成insert语句

mysql数据库管理工具有个COPY AS SQL INSERT 希望能用sql语句直接根据结果集生成insert sql语句...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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626 views

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vue项目升级命令 vue upgrade 无效

项目是基于 vue-cli 3.x 的，运行起来太慢了，每次执行npm run dev估计都得2分钟甚至更长，所以打算把脚手架升级到@vue/cli 4来试一下。现在已经卸载 vue-cli 3 了，并且安装好 @vue/cli 4，但是当我执行 vue upgrade 来升级项目是，却提示我已经是最新了。如下：该怎么处理呢？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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639 views

1 answer

前端工程师应该如何学习英语？

大家有什么方法论吗？请大佬指教...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

1 answer

word wrap - Wrapping multiline text inside a shape in SwiftUI

As the title states, I am looking for a way to wrap multiline text inside of a shape in SwiftUI (see image ... same effect with SwiftUI. Any advice would be greatly appreciated....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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620 views

1 answer

javascript - Edit words in Zapier

Im trying to reverse words in Zapier. For example "word"-->"drow". I already looked for an app which I can connect ... words with Code by Zapier (Javascript/Python). Not sure why....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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r: How can I use data.table package with sf geometry column?

I want to use data.table to join two dataframes that each have a sf geometry column, and I want to do a cross join in data.table ... class = c("sf", "tbl_df", "tbl", "data.frame"))...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Java中Timer自动停止

问题描述业务需要程序每隔10秒对数据进行一次操作，我使用Timer定时器实现此功能这个功能在18年就已经上线了，但是昨天发现这个定时器在无人操作的情况下自己停止了求问问题出现的原因以及解决方案万分感 ... 行数据处理 } }; timer.schedule(task, 1 * (60 * 1000), period); 急需解决方案！万分感谢帮助！...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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644 views

1 answer

exception - try? returns double optional in Swift 4

There are a lot of similar questions but no one describes how to handle exceptions with try? + double optional. ... 4 (upgrading to Swift 5 requires significant changes in project)...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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803 views

1 answer

spring oauth2 授权服务器和资源服务器可以在同一个包，怎么配置表单登录？

如题：配置以下注解后，在配置表单登录出现404。但配置httpBasic登录时，可以正常登录。...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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804 views

1 answer

axios中get请求可以使用表单提交FormData吗？

前端新人，最近在做一个支付接口的对接，接口是get请求：但是请求之后报has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the ... 种方法后还是报想同错误，请问各位大佬使用axios的get请求如何进行表单提交？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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719 views

1 answer

ggplot2 - How can I study the relationship between these two variables in R?

I am trying to analyse the relationship between unemployment rate and crime rate across 9 regions in England. Here ... Crime_occurrencies,color='Trend', group=1), data=crime_count)...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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684 views

1 answer

python - Improve performance of events duration computation

I have a Pandas DataFrame that looks like that: ipdb> df[:4] name thread_id state time uuid 0 CB:Component_Loc 829946510 1 ... 0 minus time when state = 1) for each uuid. Thanks!...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

请问如何开发一个 C++ 在线编辑器环境，并且可以支持互动输入。这其中可能涉及到哪些技术。

因为在线教学的需要，需要浏览器可以运行 C++ 目前我开发已经支持，直接运行但是如果遇到输入语句，就无法正确执行 #include <iostream> using namespace std; int main( ) { char name ... 可以支持类似互动输入的操作，请问大神这是如何做到的？图上站点 http://cpp.jsrun.net/...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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931 views

1 answer

Web端如何调用百度地图app?

最近做一个导航的功能，想从web端携带目的地的经纬度等参数跳到百度app， location.href="http://api.map.baidu.com/marker?location="+latitude+","+longitude+"&title=我的位置 ... 这样写的话跳到的是百度地图web端，怎么样才可以跳到百度地图APP，求解，谢谢 ...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

1 answer

php laravel asset 获取路径的问题

使用 php -S localhost:8000 public启动项目，发现无法加载resources/views/index.blade.php中热asset函数路径里的文件例如 asset('public/js/jquery-3.3.1.js') 看了一下，如 ... 了，所以有没有什么方法能够不改变代码中路径，统一把asset()的默认路径改掉吗?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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