bsf notes

Spring entry --- JPA learning notes, --- jpa learning notes Spring, which has been used for a period of time, is now only in a usable state and does not know much about anything deeper. So I decided to start learning Spring in depth. This document mainly records JPA learning. Before learning JPA, you need to understand some ORM concepts. ORM concept: Object/Relation Mapping (ORM) is a technology designed to

Python crawler learning notes-single-thread crawler and python learning notes Introduction This article mainly introduces how to crawl the course information of the wheat Institute (this crawler is still a single-thread crawler). Before getting started, let's take a look at the results. How are you doing? First, let's open the web site of the wheat Institute, and then find all the course information of the

[Crawler learning notes] Url filtering module UrlFilter, learning notes urlfilter Url Filter filters the extracted URLs again. The criteria for filtering different applications are different. For example, for baidu/google search, the criteria are generally not filtered, but for vertical search or targeted crawling applications, it may only need URLs that meet certain conditions, such as URLs that do not

Python learning notes-object-oriented basics and python learning notes 1. Classes and Instances 1.1 class definition The class definition uses the class keyword, followed by the class name (usually starts with an upper case), followed(object)Object is the class name inherited by this class. If it is not, it inherits the object class. The class name + () is used for instantiation, and parameters need to be i

SharpGL learning notes (3) Projection Transformation and viewpoint transformation, sharpgl learning notes Starting from this section, we use the VS2010 extension of SharpGL to directly generate the SharpGL project. If you do not see the following SharpGL project when creating a project, find a directory named "SharpGL 2.0 Visual Studio Extension" in the source code of SharpGL and install the directory name

SharpGL learning notes (2) model transformation, sharpgl learning notes (2) model transformation Mode Transformation refers to three operations: Moving, rotating, and scaling in the world space coordinate system. First of all, in Opengl, we use a 4x4 matrix for coordinate transformation. OpenGL's 4x4 matrix is arranged by column, as shown below. The so-called model transformation is to transform this matr

Study Notes 2, struts2 Study Notes + =,-=, * =,/= Implies forced type conversion. In logical operations, the difference between and is: : No matter whether the left side is true or false, all operations are performed on the right side. : If the left side is false, the right side is not involved in the operation. If the left side is true, the right side is involved in the operation. An exclusive or operati

Python learning notes basics-(1) Python learning notes I. system commands　 1. Press Ctrl + D to exit Python IDLE. Enter the EOF character in the input method, and press Ctrl + D 2. command line options: -D provides debugging output -O generates optimized bytecode (. pyo file) -S does not import the site module to find the python path at startup -V redundant output (detailed tracing of import statements) -M

PHP learning notes (1) brief understanding of PHP and php learning notes Target Planning: Through the first lesson, we can understand the php environment. 1. Environment Awareness: 2. access method: 3. Modify and view the code. 4. Use of Variables 5. Code indentation must have a hierarchical relationship, and it is best to keep blank lines between codes. 6. variable naming: 7. Output of variables: 8. Three

Spring learning notes (3) -- Bean injection method, learning notes bean Dependency Injection Dependency injection supports property injection, constructor injection, and factory injection. Property injection: Property injection uses the setXxx () method to inject Bean property values or dependent objects. Property injection requires Bean to provide a default constructor (no-argument constructor) and provide

Python Study Notes 02 -- list and metadata, python Study Notes 02 --I. Introduction A Data Structure is a collection of data elements that are organized together in some way. Sequence is the most basic data structure in python. python contains six built-in sequences: List, tuples, strings, Unicode strings, buffer objects, and xrange objects.Ii. Use For example, if you want to use a list to store the user

A large collection of learning notes and tomb stealing notes 　Summary of the Collection framework: 1 Collection interface: 2 Set interface: 3 HashSet // The hashCode method must be implemented for the object. The elements have no order. The efficiency is higher than that of the HashSet. 4. HashSet // is an extension of HashSet, supports sorting of elements in the rule set, and extracts 5 TreeSet by element

Python learning notes 01: Install python and python learning notes Download python: Download python from https://www.python.org/downloads/to different operating systems. Note: most linux systems are pre-installed with python and can be used directly. Python 2.7 and python 3.x versions have been installed in ubuntu16.04. Input python and python 3 to call different versions of python interpreters. For how

Python learning notes (2) and python learning notes Note eightUsage metadataThe biggest difference between a dynamic language and a static language is the definition of functions and classes, instead of at compile time, but dynamic creation at runtime.Logging module for program debuggingImport loggingUnit TestTo write unit tests, we need to introduce the unittest module that comes with python. File read/wr

Python learning notes 05: Snake game code, python learning notes Snake games: Install pygame first. You can use pip to install pygame: Pip install pygame Run the following code: #! /Usr/bin/env pythonimport pygame, sys, time, randomfrom pygame. locals import * # define the color variable redColour = pygame. color (255, 0, 0) blackColour = pygame. color (0, 0) whiteColour = pygame. color (255,255,255) greyC

Head first python cainiao Study Notes (chapter 4), python Study Notes 1, p124, error: NameError: name 'print _ lol 'is not defined To display in the file, you need to change the call of BIF print () to call the print_lol () function in the nester module in chapter 2. Therefore, you need to import the nester module. First, modify the print_lol () function in Chapter 2 nester module and update the module. T

was reminded by a colleague's remark. In fact, Himi on the Android side of the development compared to a lot less. The introduction of jars, I introduce problems caused by.Later I re-introduced Android-async-http-x.x.x.jar by the following steps to resolve:Right-click on the Android project under the Libs->import->general->file system->browse ...* This jar package is cocos2dx/cocos/platform/android/java/libs under the projectCheck Select Libs->finish as above pathSometimes the problem is relati

Threads, tasks, and synchronized learning notes (1). Synchronize learning notes 1. A simple way to create a thread is to define a delegate and call it asynchronously. 1 using System; 2 using System.Threading; 3 4 delegate int WaitAWhileDelegate(int data, int ms); 5 6 class Program 7 { 8 static void Main(string[] args) 9 {10 WaitAWhileDelegate d = WaitAWhile;11 int data = 1;12

ADO. NET learning notes getting started, ado.net learning notes This article Reprinted from: http://www.youarebug.com/forum.php? Mod = viewthread tid = 57 page = 1 extra = # pid63 This is my note in learning ADP. NET. It can be used as an introduction to ADO. NET or a review tutorial. Connection string: DataSource = localhost; AttchDBFilename = | DataDirectory | \ Database1.mdf; InitialCatalog = UserDate

[Reading Notes] C # Study Notes 1:. Net Framwork, Preface:An accidental opportunity to see a book published by @ Learning hard in the garden: Next I will share some of the things that I feel need to record in this book. Here first post @ Learning hard I in the blog Park home: http://www.cnblogs.com/zhili/And some knowledge points in this book: http://www.cnblogs.com/zhili/category/421637.html I:. Net Fram