Programmer Think

I met an algorithm problem when I was in Microsoft's 5 aspects. I calculated the number of columns according to excel column number and calculated the number of columns according to the column number. Because I didn't answer well during the interview, I recorded the implementation idea here. First of all, let's talk about the following topics: ...

There are many ways to download datatable from the server to the local. Here are three ways. Mode 1: transfer datatable to txt for download. Steps: 1. Download datatable content to server txt 2. Download the server's txt to the local 3. Delete the txt on the server Mode 2: the datatable is bound to the control GridView and then downloaded ...

1. Preface Cloud synchronization function is preparation for later expansion. His purpose is to synchronize records from local databases, such as real-time collected data and stored running records, to the cloud database. By default, the mysql database of Ali Cloud is used. The speed of Ali Cloud is still very fast. I have bought low-match and ...

1. Preface Mail forwarding function and SMS alert function are basically the same, they are triggered after judging the alert, which may be slightly different. Mail forwarding needs to rely on the Internet, and can send a large amount of data without the limitation of 60 characters of SMS (of course, SMS can split multiple sending, but it costs ...

Batch modification of excel by python In the morning, I suddenly got help from my little sister. How to use the program to delete the pictures in excel in batches? As a front-end dog, I felt a little frustrated. After all, this is not my specialty. Miss said python should be OK. google it now. It has been more than two years since I started to ...

First, thinking 1. What is tuple? Immutable sequence type List that cannot be modified 2. What operations does tuple support? Tuple is a sequence type, supporting all operations of sequence type Value by index one_tuple = ("Excellent", 17, "male", "coding", "Never Stop Learning!") one_tuple[-1] Slicing operation one_tuple = ("Excellent" ...

1. Preface From this article, write specific functional modules one by one. User modules mainly have four aspects: user login, user exit, user management, rights control.Here, you can follow simple and common practice, such as user login interface, provide a drop-down box to select the user name, then enter the password, password box cipher tex ...

  First, explain 1. Definition of notes The Java file is called Annotation, which is represented by @ interface. 2. yuan annotation There are some notes on @ interface as needed, including @ Retention, @ Target, @ Document, @ Inherited. 3. Retention policy of notes @ Retention(RetentionPolicy.SOURCE) / / the annotation only ...

vue export Excel format vue JSON Excel file Saver xlsx Recently, the company is writing a project. It needs to export the json data in vue to Excel format. There are two ways to realize this: searching the data on the Internet The second method is recommended by individuals. Although the first method is convenient, ...

Ali easyexcel is a toolkit for reading and writing Excel based on the package of poi, which mainly solves the problem of large memory occupied by reading large file poi, and also provides some simple excel operation API. But I found it on the Internet. There are few official explanations. The example ...