Analysis of manipulating objects by using association relationship in Hibernate 5 -- one-to-one association relationship

One to one relationship There are two ways to implement one-to-one association in Hibernate 5: primary key Association and foreign key Association. 1. Primary key Association Key point of primary key Association: two associated tables share a primary key value. For example, if a company is registered ...

Posted on Sat, 22 Feb 2020 07:43:52 -0500 by arpowers

Python 3 standard library: struct binary data structure

1. struct binary data structure The struct module includes functions that transform byte strings to native Python data types, such as numbers and strings. 1.1 function and Struct class Struct provides a set of module level functions that handle structure values, as well as a struct class. The format indicator converts from a string format to a ...

Posted on Sat, 22 Feb 2020 06:27:01 -0500 by Dirtbagz89

IO flow - special operation flow

Special operation flow in IO flow Summary: The special operation flow in IO flow, as the name implies, has its special function; Standard I / O stream Summary: Standard I / O streams are used for keyboard input and printout; that is, the Scanner class and System.out.println(), which we usually u ...

Posted on Sat, 22 Feb 2020 04:52:10 -0500 by drorgo

Metaclasses and properties (Ⅱ)

This article is based on "Effective Python - 59 effective ways to write high-quality Python code" [U.S.] Brett Slatkin translated the contents of this book, wrote his own insights in some aspects, and excerpted some as reading notes for future encouragement. Invasion and deletion. Article 31 ...

Posted on Sat, 22 Feb 2020 04:50:46 -0500 by tallberg

taro realizes shopping cart logic

taro realizes shopping cart logic What is taro? Taro is a multi terminal development solution that follows the React syntax specification. Nowadays, there are various forms on the market, such as Web, react native, wechat applet and so on. When the business requirements are expressed in different e ...

Posted on Sat, 22 Feb 2020 04:35:58 -0500 by clown[NOR]

Notes for beginners of Python

Face to face programming: write classes that represent things and scenes in the world, and create objects based on these classes. The created objects are called instantiations. Create class class Dog(): #The first letter in the class name in Python should be capitalized def __init__(self, name, age): #The functions in the class are ...

Posted on Sat, 22 Feb 2020 02:24:29 -0500 by fansphp

Nodejs Column - Modularization of Nodejs (module.exports and exports principles, Nodejs modularization principles)

Modularization of Nodejs In the process of our daily web development, modularization can not be lost. Each of them has its own way of implementation. Noejs follows the commonjs specification. Think of every file as a module If a module needs to expose some data or functionality for use by other mo ...

Posted on Fri, 21 Feb 2020 19:59:30 -0500 by Skepsis

HTML+JS+CSS to realize student information management system

HTML+JS+CSS to realize student information management system Effect page increase Delete change check Page turning Code difficulty Difficulty 1 Difficulty 2 Difficulty 3 Difficulty 4 epilogue Effect If you don't speak much, you can directly see the effect. This code is complex. I hope you ca ...

Posted on Fri, 21 Feb 2020 10:23:27 -0500 by Copernicus

Gradient and mask textures

Gradient texture Texture can not only define the color of an object, but also store any surface attributes. For example, use a gradient texture to control the diffuse lighting results. You can control the diffuse illumination of an object by using different gradient textures. Shader "Custom/RampTe ...

Posted on Fri, 21 Feb 2020 08:59:05 -0500 by nick_whitmarsh

DOM events of JavaScript

I. concept After some components are executed, some code execution will be triggered. Details are as follows: Event: some operations, such as: click, double-click, keyboard pressed, mouse moved. Event source: component, such as button, text input box, etc Listener: Code Register listening: combine e ...

Posted on Fri, 21 Feb 2020 08:14:48 -0500 by petersen313