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Love buy back website optimization - Redis cache

Why cache? Reduce database pressure; Increase request speed. When the data is stored in the cache, it can be retrieved directly from the cache when i...
8:37 10 January 2020

Use SignalR to actively push alert logs from the server to various terminals (desktop, mobile, web)

WeChat public address: Dotnet9 Website: Dotnet9 , questions or suggestions: Please leave a message on the website, If it helps you: Welcome appreciat...
8:17 10 January 2020

What to do if php fails to call python

What if php fails to call python? Solutions to PHP's failure in calling Python Suppose there is a file: php_test.php python_test.py To run Python...
1:22 10 January 2020

Prototype application in JS (inheritance and extension)

Prototypes in JS Prototype is a very important mechanism in JavaScript. Through [[prototype]], we can easily implement the inheritance and extension ...
13:18 8 January 2020

Nginx configure free https certificate

Let's Encrypt is used for free SSL certificate application. 1. Let's Encrypt is a public free SSL project in foreign countries, which is hos...
13:33 6 January 2020

Android - Custom external shadow, internal transparent canvas mask layout

Explain: A simple requirement, the external shadow, the internal layout is transparent, and the camera is opened at the bottom (here only the layout ...
11:00 5 January 2020

RMAN Migration Library in ORACLE10G Non-archiving Mode

Environmental information: Source Library Target Library operating system WIN7 WIN SVR 2012 R2 IP x.x.x.216 x.x.x.112 Database Version 10.2.0.4.0 - 6...
15:12 4 January 2020

Kubeflow series: Solve one-click installation of kubeflow based on Ali cloud mirror in China

Environmental preparation kubeflow is very demanding for the environment. See the official requirements:at least one worker node with a minimum of: 4 ...
14:53 4 January 2020

How to use EasyPermissions

Starting with Android 6.0 (API level 23), users begin to grant permissions to applications when they are running, rather than when they are installed...
7:05 4 January 2020

Kubeflow series: analysis of kubeflow components

As a big gift package of machine learning based on cloud native, kubeflow can be used as a good example of cloud native learning. At the same time, t...
8:53 3 January 2020

api request function based on axios encapsulation

After vue resource is not recommended in vue 2.0, most people choose axios. axios can be used not only in vue, but also in angular and react. So lear...
3:08 3 January 2020

Angular4 learning (IV) Product component and Stars component linkage

1, The first Angular technology used 1. Template data binding is generated repeatedly according to the number of data *ngFor="let XXX of YYY&quo...
12:46 2 January 2020

android Camera camera class

Several process methods related to Camera class Camera.open(cameraId) camera.setDisplayOrientation(0) set camera horizontal direction Mgamera.setprevi...
4:31 2 January 2020

PXE+Kickstart unattended installation

PXE one key installation PXE(Preboot eXecute Environment) is mainly used to boot the client host to install the Linux operating system in the unatten...
3:27 2 January 2020

Create and get cookie s

Create and get cookie s Producer: heart and soul Cookie: in the Internet, a cookie is a small piece of text information generated on a web server and ...
4:14 31 December 2020

OOM problems caused by a MongoDB paging query

OOM Description: 2018-09-18 14:46:54.338 [http-nio-8099-exec-8] ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherS...
10:10 30 December 2020

postgresql connects to SQL server using odbc_fdw

Install and configure ODBC? FDW 1. Install unixODBC apt-get install unixodbc unixodbc-dev 2. Install Microsoft ODBC Driver 17 for SQL Server curl http...
12:05 28 December 2019

nginx+tomcat for dynamic-static separation+load balancing

1. Introduction to static-dynamic separation and load balancing Dynamic and Static Separation of Nginx+Tomcat:The so-called dynamic-static separation...
22:28 22 December 2019

Getting started with the web front end to the actual combat: the method and difference of hidden elements in CSS

1.opacity opacity: 0 makes the element itself and its children invisible, while the element itself still occupies its own position and plays a role i...
10:22 19 December 2019

Manage hierarchical data using MySql

Summary We know that relational database tables are better suited for flat lists than for hierarchical data with parent-child relationships that can b...
21:15 17 December 2019

Getting started with the web front end to the real world: several ways to bind events with HTML tag pseudo elements

Here are a few simple ways to implement click pseudo elements for event handling, with example code attached. HTML structure First of all, HTML struc...
17:11 16 December 2019

Add emoticons to the applet

The native textarea has discarded the button of selecting expression, so it simulates an expression selector Here is the effect display Realization pr...
9:23 14 December 2019

Recommended collection: Node.js project architecture that should not be missed

Express.js is a great framework for developing the Node.js REST API, but it does not give you any clues about how to organize your Node.js project. I...
19:12 13 December 2019

What's the secret hidden in Taobao code shared with wechat friends

It's going to be my birthday soon. I try to find the same gift I like on Taobao. Click the top right corner to share her wechat to see if she can...
19:54 9 December 2019

Oracle Bpm 11g Approval Performance Optimization

background The project coordinates office work and workflow using Oracle Bpm products. Recently, it took a long time for the approval of complaints by...
13:41 8 December 2019

Using JPA in SpringBoot

In the last article, we used the JdbcTemplate to access the database. After all, we used the native SQL form. I'm sure that lazy people like me ...
19:49 7 December 2019

Explore the difference between Reflect.apply and Function.prototype.apply

As we all know, ES6 adds a global, built-in, non constructable Reflect object, and provides its next series of interceptable operation methods. One of...
12:51 7 December 2019

Create a jdbc connection

This paper introduces how to establish a jdbc connection for database query. Create a java project and import the jar package. Using mysql database, t...
2:08 7 December 2019

Thoroughly understand JavaScript forEach & map

background In JavaScript, we are certainly familiar with array traversal. The most common two are forEach and map. (of course, there are others such a...
21:18 6 December 2019

[JavaSE] JDBC programming of Java

JDBC creation process Load database driver Create database connection Create operation command Execute SQL statement Process return result set Close ...
13:23 6 December 2019