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What is the simplest way in C# (.cs file) to get the count from the SQL command SELECT COUNT(*) FROM table_name into an int variable?...

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

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admin - how to use local file acces rights while running powershell as administrator

So, I have an admin account to install programs, but with that admin account, I do not have access to a ... asking for the missing access rights, is unfortunately not an option....

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

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sql查询问题返回结果集或者参数

问题描述： sql查询，如果结果集不为空则返回结果集。如果结果集为空，则返回查询参数？说明如下： SELECT CASE WHEN a IS NULL THEN '${k}' ELSE a END AS a; (SELECT a FROM A...

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

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c# - IOptions pattern with default dynamic value not working as expected

I have a class which contains my configuration of a StartDate string, it is a yyyyMMdd hh:mm:ss representation of ... get it to return the current timestamp whenever it is called?...

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

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sql - Column Unknown Firebird Python

I'm trying to make a GUI with python and tkinter for a firebird database. When I try to write the input from boxes into the ... (0, END) data.delete(0, END) status.delete(0, END)...

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

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How to store Timestamp in firestore using flutter-web

I can't save a Timestamp object in Firebase Firestore using Flutter Web, with Android or iOS it works normally Already ... 164070:16 at http://localhost:62147/dart_sdk.js:163778:11...

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

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javascript - Bootstrap - Scaling Images in a Specific Way

I have tried searching as much as I can through google as well as figuring out the issue myself, but no matter what I ... ; } Any help with this is greatly appreciated! Thank you!!...

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

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秒级的定时任务怎么做

scheduleJob设置定时任务要求scheduleTime是一个MINUTE类型的标量/向量,我想要每10s读一个文件里的数据,怎么做定时任务....

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

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539 views

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element ui label长度更改失效

问题代码: <el-form-item :label="item.label" label-width="180px" >     <el-switch :disabled="item.disabled" ></el-switch> </ ... 原来的130px长度,我有点懵逼了,有前端大佬指导一下吗?更改label的长度....

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

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515 views

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swoole使用协程一定要用协程容器吗？

好像不用容器包起来也可以正常跑，想问下不用容器有什么不好的地方吗...

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

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sql - Azure - Enable/Disable database setting for security purposes

We have certain security requirements in order for our app to go live within our orgainisation. We are using the ... clr enabled'; How to we update these settings? thanks....

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

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627 views

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js判断是否出现省略号

{ overflow:hidden; white-space:nowrap; text-overflow: ellipsis; } 使用css将文本超出显示省略号... 图1: 图2: 使用哦scrollWidth可以判断的出来宽来判断的出布尔值但是图1图 ... 使用js来判断文字length截取,体验不好实际上dom上的文本也是抓取不到... 省略号...

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

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如何获取dom 的子节点并给样式

<div class="menu-m-content-list-item showChild"> <div class="menu-m-content-list-item-title"> <p>xxxx</p> <img src="../../images/mobile/ ... )';//想给子节点的img一个样式,请问怎么选择这个dom } } }...

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

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771 views

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javascript - update not a function - firebase firestore

I reaslied after sending data to my database that you cannot organised chronologically without the timestamp. I am therefore trying ... "Error writing document: ", error); }) } }...

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

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1.2k views

1 answer

Here API: Matrix Routing API V8 - Asynchronus request - Receiving error when retrieving calculation status

I'm currently developing a little algorithm to solve the VRP. I herefore use the HERE Matrix Routing API to identify the ... reveal a little bug? Thanks for your help! BR, Difreg...

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

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836 views

1 answer

Promise

Promise怎么理解...

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

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1.2k views

1 answer

Rust-Wasm 向 Vue3 传递函数,并绑定到dom事件上

本人想通过由 Rust 语言写的事件函数经过编译成 Webassembly 然后给 Vue3 的事件绑定函数使用 Rust 语言使用的包为 wasm-bindgen 编译工具为 wasm-pack 编译命令：$ wasm-pack build --target ... "); 是可以被绑定上，但我是想使用这个事件参数,不知道怎么解决，希望有解决方案...

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

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1.1k views

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babel报错

这个是什么问题呢，这个是我的babelrc配置这个是我的package.json配置，现在他总是报错React未定义，是因为我安装那个babel-preset-react的原因吗？如果是的话，该怎么处理呢...

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

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1.2k views

1 answer

angular - Can we extend a model with the same ease as using an extraProperties Map, using the NGXS patterns?

Background We are planning to use Angular whatever-version-we're-on-now, Typescript, NGXS. Still in the API ... - description, stateName" where stateName is an additional field....

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

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1.3k views

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为什么在函数内用parseExpr执行会报SQL context is not initialized yet

在DolphinDB GUI内执行下面代码： def yoy_continuous_validation(X, threshold, validation_way, continuous_len){ if (not(string(validation_way) in ['>', ... continuous_len,1,0) 直接执行不会报错，是什么原因？...

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

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android - How can i retrieve a specific data from a firebase child node into Adnroid studio

referenc2= FirebaseDatabase.getInstance().getReference("messageCounter").child("node"); referenc2.addValueEventListener(new ... variable in android studio. can anyone help?...

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

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1.7k views

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java - Why is my IDE telling me my if statement is redundant?

Why is NetBeans with TMC (IDE recommended by MOOC fi Java) telling my that my final if statement is redundant? @Override ... (compared.liNumber)) { return false; } return true; }...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.9k views

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crash - When I close / click back button the google vision api qr code scanner app crashes

When i click on the reader button opened up asking permission for camera, allowed after that when i click on close button or ... if (mPreview != null) { mPreview.release(); } }...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

1 answer

hbuilder如何连接git

### 问题描述本人用hbuilder上带的插件连接阿里云的代码库。先用命令行是可以的。但是用hbuilder就不行，好像是哪里验证错误。请问应该怎么配置啊，本人git新手，尽量具体点 ### 问题出现的平台版本及自己尝试过哪些方法 ### 相关代码...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

1 answer

请问怎样调整el-slider的默认位置呢？

需求是：需要默认显示中间位置。那个框里显示0因为0是中间值，但是那个按钮要在中间显示。现在如果把默认值设置成50的话。图标是在中间显示了。但是右边也会显示50.但是我要的是右边显示成0 如图：...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.7k views

1 answer

求教，反向代理和请求转发的区别？

比如一下的情况：用户 a1、a2 中间服务器 b 服务器 c 用户 a1/a2 请求 b 服务器，而 b 从服务器 c 获取数据返回给 a1/a2 这种操作应该就叫反向代理吧，如果是有如下疑问这种操作和 b 服务器直接请求 c 服务器获取数据后转发给 a1/a2 有什么区别呢？...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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html - How to start timer only for selected item ? Angular Javascript

First look at my code which is complete here: https://stackblitz.com/edit/test-trainin-2-gv9glh?file=src%2Fapp%2Fapp. ... ="startTimerForSingleTraining(j)" > Go </button> </div>...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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r - Why am I having trouble filtering by date and time using lubridate?

I have a data frame, and I'm trying to keep records after 10:05 AM on 1/22/21. df1$`Date/Time Opened` <- ... correctly. (Either all or none of the records are filtered out.)...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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