Tag：Full name
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Time：2021-10-15
Basic syntax of MySQL: MySQL data is available at the end of the article Execution sequence: from -> join -> on -> where -> groupby -> avg max .. -> having -> select ->order by SQL language classification: DQL: Data Query Language DML: Data Manipulation Language DDL: Data Definition Language DCL: data control language DQL […]
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Time：2021-9-19
Train tickets for the first day of this year’s Spring Festival transportation officially went on sale on December 30. Every Spring Festival, many passengers buy a ticket to go home, “Eight Immortals cross the sea and each show their magic power”. However, there are always some passengers “magic power failure”. How to buy train tickets […]
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Time：2021-9-18
Flink provides corresponding dataset APIs and datastream APIs to handle bounded and unbounded datasets. We can develop corresponding Java programs or Scala programs to complete the corresponding functions. The following examples illustrate some basic operators in the dataset API. Next, we will demonstrate the role of each operator through specific code. 1. Map, flatmap and […]
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Time：2021-9-15
Add validation for the form in the previous section File：plugins\raiseinfo\contact\components\ContactForm.php use Illuminate\Support\Facades\Validator; use Illuminate\Support\Facades\Redirect; … public function onSend() { $validator = Validator::make( [ ‘name’ => Input::get(‘name’), ’email’ => Input::get(’email’) ], [ ‘name’ => ‘required|min:5′, ’email’ => ‘required|email’ ] ); if($validator->fails()){ return Redirect::back()->withErrors($validator); }else{ $vars = [ ‘name’ => Input::get(‘name’), ’email’ => Input::get(’email’), ‘content’ => Input::get(‘content’) […]
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Time：2021-8-29
Project directory: log4j.xml 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Pom.xml configuration 1 2 3 4 junit 5 junit 6 4.11 7 test 8 9 10 11 mysql 12 mysql-connector-java 13 5.1.29 14 15 16 17 org.mybatis 18 mybatis 19 […]
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Time：2021-8-27
When a class defines a member method, local variables and member variables can have the same name, but member variables cannot be accessed at this time. To avoid this situation, Java provides the this keyword, which represents the current object and points to the calling object itself. Next, demonstrate the essence of this 1 class […]
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Time：2021-8-19
preface: Using Bayesian formula, guess the other party’s gender according to the other party’s Chinese name. No more nonsense. Let’s start happily~ development tool Python version:3.6.4 Related modules: Pyqt5 module; And some Python built-in modules. Environment construction Install Python and add it to the environment variable. PIP can install the relevant modules required. Principle introduction […]
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Time：2021-8-6
1、 Output function 1.1 Python3-print() In Python 3. The usage of print() is as follows: #Demo # = = = = = print() end parameter in pychar = = = = print (‘Hello ‘, end =’ < — ‘) print (‘World’) # = = = = = execution result = = = = = = […]
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Time：2021-7-28
✨ statement The answer to the exercise is not guaranteed to be completely correct, which is for reference only MySQL：5.7 Recommended software: Navicat premium Learning SQL statements requires diligent practice! ✨ Field description of each table course CId Course serial number, primary key PCId Prerequisite course DId Opening department number, foreign key CName Course name […]
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Time：2021-6-27
Key value coding (KVC) is used to access the properties of the class you want to access. Using KVC Define student class //Student.h #import <Foundation/Foundation.h> @interface Student : NSObject { NSString *name; } @end // Student.m // KVCDemo // // Created by Michael on 2016/9/30. // Copyright © 2016 Michael. All rights reserved // #import […]
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Time：2021-6-20
After we enter a web address and press enter, the browser will automatically add a prefix of HTTP (s): to it. So what’s the difference between the two? HTTP HTTP full name hypertext transfer protocol, that is hypertext transfer protocol, browser and server communication is generally through the HTTP protocol. Features of HTTP website:When users […]
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Time：2021-6-14
preface In previous articles《Angular form validation》This paper mainly introduces some basic knowledge about angular form verification. This article will focus on expanding the relevant content of angular form verification and the application in actual development. Form validation scenario 1 In the actual development, we may have such a situation. We want to be able to […]
