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login("admin","123456") db=database("dfs://stations", VALUE, 2020.01.01..2020.12.31) pt = db.createPartitionedTable( ... ). Please provide one or a list of tables as model schema....

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

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463 views

1 answer

windows - Python create exe file with pyinstaller

i write a program that detected and recognition visitors with face_recognition . i try to make exe file with ... * https://github.com/shahram-arefhakimi/Visitors_with_PySide2 **"...

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

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488 views

1 answer

小程序canvas生成的背景图片和UI上的不一样怎么回事？

UI上面生成的背景图片的宽高是550*900 生成的宽高也没错可是生成的图片明显跟UI上的比例不对这是怎么回事？ <view hidden="{{hidden}}" class='preview_wrapper'> ... { console.log(res); wx.hideLoading(); } }); }, 2000); canvas生成的 UI...

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

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554 views

1 answer

使用split("-")分隔一个范围字符串为字符串有负数怎么办呀。

使用split分隔一个范围字符串为字符串有负数怎么办呀比如："1-2"用split("-")分隔是正常的，但是"-1-2"使用split("-")就不正常了只要有负数就不正常了想过使用正则表达式但是写不出?? 补充一下可能的情况开 ... 数 "-m-n" 开始为负数，截止正数 "m--n" 开始正数，截止负数 "-m--n" 开始负数，截止负数...

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

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432 views

1 answer

multithreading - How can i print data in a file using 2 threads in java

i need to print some data in a file using 2 threads that run alternative, one for odd index, and the other for ... catch exception or anything, could you guys please help me out?...

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

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516 views

1 answer

关于setinterval和js单线程的困惑

我的个人理解 JavaScript是单线程的，使用setinterval是定时给这个单线程添加事情，那么我使用两个setinterval去请求两个不同的数据接口，就不会存在并发，按队列顺序请求数据，那么为什么使用setinterval去请求数据接口会出现卡顿...

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

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653 views

1 answer

AtomicLong中的incrementAndGet方法线程安全的么

public final long incrementAndGet() { return unsafe.getAndAddLong(this, valueOffset, 1L) + 1L; } AtomicLong源码中的incrementAndGet方,unsafe.getAndAddLong( ... ，请大佬讲解这个是看java并发编程之美遇到的问题...

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

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902 views

1 answer

Pandas/Python how to store store looped values

I am trying to loop multiple tickers into a function and I can print successfully the results however I cannot store them, ... to be able to print the 2 lines outside the code...

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

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755 views

1 answer

nodejs 在mongodb在跨数据库之中如何进行关联起来查询，并且支持筛选关联表的条件进行查询

"班级数据库": "mongodb://192.168.3.17/xxx "学生数据库": "mongodb://192.168.3.99/xxx (只读) 使用 mongoose.createConnection 进行 ... { classId: source.classId } } }, projection: { openid: true } });...

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

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1.0k views

1 answer

JWT中token过期问题？

使用JWT生成token后为token设置一个过期时间（假设为30分钟）并且存在redis中，等到30分钟之后token会过期。但是如果我一直在浏览网站，那么30分钟之后token就不应该过期（过期之后就需要重新登录，这样逻辑很奇怪）。请问一下这样该怎么设计呢？...

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

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832 views

1 answer

MySQL：关于 MDL 的读锁与写锁

Session A 与 Session B 均持有【MDL 读锁】，读锁间不互斥，故可同时读取表 T，由于 session A 持有的【MDL 读锁】尚未释放，致使 Session C 因无法获取【MDL 写锁】而阻塞，由于 Session D ... 为无法获取【MDL 写锁】，那 Session D 请求【MDL 读锁】也不行也会被阻塞，这是什么机制呢?...

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

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1.1k views

1 answer

show slave status ;没有数据

为啥没有数据呢...

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

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1.1k views

1 answer

求教用echarts 怎么实现一个图表每个月都有一个峰值曲线图那种

横坐标是一月二月三月等，图形是每个月都有一个峰值曲线图，一月的就在一月那一块，二月在二月那一块，单独的...

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

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1.1k views

1 answer

c - Is there a more efficient way to reverse decimal numbers?

I am trying to reverse decimal numbers more efficient. #include <stdio.h> int main() { while(1) { int a,result; ... I can reverse more numbers in an efficient way ( less code)...

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

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1.3k views

1 answer

node.js - MERN app works locally, but I get 503 when deploying to Heroku

I'm working on a MERN app, pretty much done, all I have left to do is deploy it. The app works perfectly when I ... .message}`.red) process.exit(1) } } module.exports = connectDB...

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

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1.4k views

1 answer

node.js - Mongoose updateMany by manipulating data before saving each item

I have seen how mongoose updateMany() can be used to update some fields easily. My question is can updateMany() also be ... console.log(err); return res.status(500).json(err); }...

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

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1.1k views

1 answer

替换评论框和评论列表位置后输出错误应该如何解决？

网站原本评论框在下评论内容列表在上替换前能够正常显示，替换位置评论框在上评论列表在下后输出错误替换位置代码如下未替换时如下正确提交时点击提交后显示如下：顶部第一条为最新评论替换位置后输出错误如下这是什么原因造成的？应该如何修改啊~求解答...

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

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1.9k views

1 answer

'relation "django_site" does not exist' only when running Django tests in GitHub Actions

I have a Django 3.1 project with an Admin class like this really simple example: from django.contrib import admin from ... 'm stumped as to why only these Site-related tests fail....

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

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1.2k views

1 answer

vue怎么拿到表单里的文件并从接口一起传给后端

vue怎么拿到表单里的文件并从接口一起传给后端 <div class="layui-form-item layui-form-text"> <label class="layui-form-label">订单号</label> ... success: function(res) { }, error: function(jqXHR) { } }); }...

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

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1.2k views

1 answer

Java jdbc 无法加载 mysql 驱动

初学 java 连接数据库，正常创建工程并添加 jar，却报错！！！求教！！！环境： IDEA： 2020.2 Mysql：8.0.22 系统 macOS BigSur 先贴上目录结构源代码 package com. ... : Task execution finished 'Main.main()'. 但我已在 IDEA 中添加这个包求教哇！！！...

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

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1.4k views

1 answer

vscode插件开发，怎么取消json文件的鼠标hover提示

做了一个vscode插件，当鼠标停留在json文件内容上时，会有一个hover提示内容，但是这和vscode自带的鼠标hover提示有冲突。不知道怎么把自带的hover提示去掉...

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

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1.5k views

1 answer

How to call an SQL function with table return in java

How to call an SQL function with table return in java? You would need to call from java an SQL function ... WHERE dniMedico=@dniMedico and fecha=@fechaIngreso ) GO Thanks a lot...

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

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1.7k views

1 answer

javascript - Convert BN to number

In truffle console I am executing the following statement, result = token.balanceOf(accounts[1]) This statement returns the ... is not a function Help me to fix this thiis....

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

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1.4k views

1 answer

请推荐一门能精确控制大量并发并行的编程语言或解决方案

需求是短时间内发送大量 GET 和 POST 请求，支持并行，要有极致的效率，慢一毫秒都无法接受的那种我现在已经用 Python 的异步方式实现了一个小 Demo，用到了 Trio 和 HTTPX 这两个包但是速度并不满意虽然能够并发，但 ... 我也搜了相关的内容，比如用 Go 语言试试但是时间有限，比较着急，希望熟悉的大佬能指点一下，谢谢 ...

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

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1.4k views

1 answer

MS Graph Calendar event not getting created for specific O365 domains

I currently have a Graph API based OAuth application in Azure AD that is used by our application to schedule events on ... in the past or can point me towards some hypothesis?...

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

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1.5k views

1 answer

js 能不能监听到每个函数的调用？

有一份项目代码，希望运行的时候，每个函数执行时都打印一下这个函数的名字。有办法吗？...

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

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1.4k views

1 answer

javascript - How to add and update array in array

I'm trying to create a multidimensionnal array. var ingredients_list = []; var data_to_push = [1,50,'test'] ingredients_list. ... ", 35, "Updated"] length: 2 __proto__: Array(0)...

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

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1.1k views

1 answer

vue.config.js 配置多个跨域请求默认是api接口

如图配置了两个跨域请求其中/user/userinfo用的是api接口但下面的this.$set图片文件路径我想换成resource接口但是一直显示api接口变成了api+resource为什么呢？图片在数据库存的路径是 /resource/ ... GY\_01 (6).jpg 我又另外试了其他域名请求可是它就是一直调用第一个/api接口 ...

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

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