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707 views

1 answer

这是leetcode中刷到的题，但是论坛里问了一遍，这个问题一直没能解决，所以想请教一下为什么这里用having是错的题目如下：我的答案是这样的： select p ... and u.purchase_date<=p.end_date 报错信息： Unknown column 'purchase_date' in 'having clause'...

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

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708 views

1 answer

怎么修改表的列名

请教一个问题，这样一个table，在第三列列名不确定的情况下，应该怎么改第三列的列名呢？试了用元编程来改，结果也不太对代码如下： sql( ... date_array_p),sqlColAlias(<colNames(tmp_cur_col_table)[2]>, `value)), from = tmp_cur_col_table).eval()...

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

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1.4k views

1 answer

electron设置窗口背景透明后`transparent: true`，最小化还原窗口和隐藏展示窗口，会频闪一下

类似刷新窗口的动作,去掉这个属性就不会出现，从网上扒拉的钉钉开源代码，加上这个transparent: true 窗口从不可见到可见，也会出现闪烁。加这个属性是为了自定义窗口的圆角，阴影~~~~...

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

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967 views

1 answer

java - spring data R2DBC change @Table dynamiclly or another strategy

I have a problem about spring data R2DBC with sql server, I've used @Table annotation and a value of this is e.g. ... but I think that this way is unsafe. Thanks for your answers....

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

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933 views

1 answer

antd form表单实例不存在getFieldDecorator？

如题，看网上大部分文章都是说const { getFieldDecorator } = this.props.form，也就是说getFieldDecorator是form实例上的方法但是当我使用 ... (); const { getFieldDecorator } = form的时候，报错getFieldDecorator是undefined ...

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

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963 views

1 answer

swagger的url相同时只展示一条

每个方法的mapping： @RequestMapping(params = "method=getHelpInfo") 通过method参数来区分，这样所有的url都是相同的，在接入swagger后，发现相同url的只能展示一条，这个问题有大佬遇到过吗？...

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

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989 views

1 answer

php - MySQLi SELECT statement requires LIMIT

I'm trying to display a listing of 6 columns from a database table. This table happens to have a bit over 30,000 ... and MySQLi and the new code isn't working the same way....

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

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904 views

1 answer

VUE接入这个jQuery效果好接入吗？

首页登录页面领导让接入这个水波纹效果这个应该是用jQuery写的不知道用在vue框架中好接入这个效果吗？用了vue以后就没用过jQuery了效果...

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

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1.7k views

1 answer

Add dicts with identical keys to list without overwriting values in Python

I have the following problem: In a loop over a input parameter list I make an API call for each list entry. I want to ... 'foobar', 'qty': '10'}] Your help is much appreciated....

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

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2.2k views

1 answer

java这门语言好不好学呢

java好不好学？...

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

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2.5k views

1 answer

r - Are vectors determined using envfit() independently calculated?

I am new to doing NMDS in R, and I have a question about how the vectors that characterize the fit of environmental ... to do with the function itself. Thank you for any help!...

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

0 votes

2.6k views

1 answer

c# - Reducing bundle size Unity

I am creating a game with a lot of high resolution images. But the problem is that after build the app weighs ... to reduce the size of an app without sacrificing images quality?...

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

0 votes

2.8k views

1 answer

flutter - create one class from two class and access all properties

I have one button class. I want to add this button class in container 2 times and it will create one class. Now i want ... style: BlabelStyle(), ), onPressed: onPressed, ), ); } }...

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

0 votes

2.6k views

1 answer

plupload插件上传0kb的文件，没有回调，也不走error？怎么办。

如题，在用plupload上传图片时上传0kb的文件不会触发任何events，也不会报错（例如文件尺寸过大601），现在想在用户选择0kb的问件时提示用户，怎么办各位大佬？！...

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

0 votes

3.3k views

1 answer

Application Insights Summarize with Having clause

I need to summarize an Application Insights query where the count > 1. I don't see any "Having" clause like SQL ... summarize Count = count() by MessageId | order by Count desc...

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

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3.3k views

1 answer

android - having trouble running a flutter them on adroid studio

I'm new to the intricate dev world. Im a novice at best and am use to working with WordPress. is there anyway ... from envato to android studios and then to the emulator, Please?...

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

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3.6k views

1 answer

javascript - How can I show elements based on the selected option?

Isn't there a better solution than the commented if statement? I'm trying switch case but in this code, I can't hide the div so it ... ': $('.test2').show(); break; } }); </script>...

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

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4.5k views

1 answer

asp.net mvc - Linq Select OrderBy ThenBy Kendo Dropdownlist

My application is MVC5. I am populating Countries Kendo Dropdownlist, trying to place Canada and United States at the top of the ... Can I use two ThenBy? or what am I doing wrong?...

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

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3.6k views

1 answer

消息队列使用场景疑惑

现在有一个账户钱包变动记录表，这种有必要用队列实现么？多谢各位指点，我写了个简单的demo欢迎指点：https://github.com/liuzhongsh......

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

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4.8k views

1 answer

Fail2ban无法启用sshd jail

已新增配置jail.local: [DEFAULT] maxretry = 5 findtime = 60 [sshd] enbale = true port = 19369 backend = auto 重启指令：sudo service ... but the jail 'sshd' does not exist 请问该如何启用sshd jail？...

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

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4.0k views

1 answer

一次失败的 http 请求

后端的接口是通的，用 postman 也可以跑成功，或者放到浏览器里也有响应，但是前端请求失败，上面是抓到的 HTTP 相关信息初步排除跨域的问题（不排除有这个可能），因为 options 请求是能正常发送，且能响应 200，来问下大家有没有什么解决问题的思路...

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

0 votes

4.0k views

1 answer

当项目使用多个npm包，如何解决babel代码重复问题？

比如项目依赖a b c 三个npm包（都是自己写的）这3个包都是用的es6+编写的每个包通过各自babel编译后生成dist/index文件作为包的入口，例如： "main": "dist/index.js", 那么每个index.js其 ... 项目因这3个包多了60*3K代码，其中有60*2k代码是多余的大神们，请问如何避免多增加120k代码？？？...

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

0 votes

4.1k views

1 answer

js正则的问题

正则 let str = `\loves{小猫}{鱼} \loves2{小猫1}{鱼2} `; let reg2 = new RegExp(`(\\([\s\S]*?))(\{)([\s\S]*?)(\})(\{)([\s\S^\{\}]*?)(\} ... 括号里面不要再有 { 或者 } 符号应该怎么写正则呢（这个排版我反复编辑了四五次，实在调不好）...

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

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4.1k views

1 answer

skew可以用scale + rotate3d 表示出来吗

通过skew动画，给人给感觉像是通过缩放和 3d方向的旋转模拟出来的？但是没有看到过类似的证明，请问我的猜想是否正确呢...

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

0 votes

4.1k views

1 answer

echarts 怎么给每一个series配置单独的barGap

echarts演示链接当前代码实现效果如下图所示想要将进度数据宽度减小,并在总体进度中居中显示显示效果如下本来想用barGap进行距离控制,但是barGap只能够设置一个,导致了警戒线series也进行了偏移请问能够给一个series设置单独的barGap, 或者是否有其他解决方案...

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

0 votes

4.7k views

1 answer

javascript - jQuery Raty duplicates stars when going back and forward using browser's navigation

I have a question regarding jQuery Raty plugin. I have a page that lists posts for cars where every post has ratings 1-5. ... '/assets/' }); Any tips here? Thank you i advanced....

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

0 votes

4.0k views

1 answer

express搭建的服务器，运行都是使用node app.js吗？

最近在学习express，我的项目的入口文件是app.js 每次运行起来都是执行 node app.js 本人有个疑问，将来要是真部署到线上，是不是也要执行 node app.js啊，感觉php他们，都有phpstudy等等的工具，可以开启服务 ... 如果部署到服务器，比如阿里云服务器，之后再在项目目录文件夹中，执行个 node app.js 怪怪的 ...

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

0 votes

3.5k views

1 answer

Java的protobuf生成类直接保存数据库

目前的orm框架基本都可以对应到Java bean，但是有没有哪一个支持直接使用protobuf生成的类，看到过mybatis支持（但是mybatis使用较为繁琐），不知道还有没有其他的什么项目支持的，看看大家的看法？或者是针对这种情况有 ... 定义一层java bean，然后自己写一个转换逻辑，这样子就可以更好地使用orm框架了，还是有其他更好地方案？...

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

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