slack for programmers

exist. That's why it's common for Oracle development to have this unspoken rule: when you build a table, the table name and field are all capitalized! This facilitates handwritten SQL, but also for unified specifications! This feature of Oracle is really not suitable for programmers who are accustomed to SQL Server or MYSQL. At the beginning of this, I was in my heart 10,000 alpaca passing by ...Character type comparison caseIn SQL Server, character

Label:1. Log4net Library is the Apache log4j framework at Microsoft. NET platform is a tool that helps programmers to output log information to various targets (consoles, files, databases, etc.). 2. The structure of the log4net is as follows: Log4net has four main components, namely Logger (recorder), Repository (library), Appender (attachment), and layout. 3. Configuration nodes are made up of logger and appender. Logger describes which appender to u

Software development is a human-centered process that relies much more on people than traditional hardware production enterprises. To maintain the stability of development capabilities, software processes must be defined on the one hand, linking People, technologies, and tools with processes as the pivot. On the other hand, we must also strengthen the cultivation of talents so that people's work ability can be stabilized and the autonomy of personnel can be improved. As social needs expand Progr

container framework CEF -- The Chromium Embedded Framework -- Embedded into The Framework of The Chrome browser built into The desktop application. ... And so on. By the way, I remember that Microsoft already has a solution for how to use HTML/JS to Build Windows applications, and there are more solutions, but now I cannot remember it. In fact, some of my favorite desktop tools, such as Slack, Atom, and VS Code, are actually implemented based on we

Why should our programmers focus on JavaScript? Inspired by the JS status I saw in my enterprise this week, I wrote this article. 10 years ago, I never thought that JavaScript would become almost ubiquitous. The following are the reasons why you need to pay attention to JavaScript. First, I think one of the main reasons for the popularity of JavaScript is that JavaScript is very easy to access. It is relatively easy for beginners to learn JavaScript.

avoids unnecessary inter-cache replication as much as possible, and only performs operations in the correct location. For example, when dealing with routes, URL decoding is done before routing matches.=large Open Source Contributors, I need your help.I have been continuously developing japronto for more than three months, not only on every business day, but also on weekends. In addition to my daily work, I devote all my time and energy to this project.I think it's time to share the fruits of my

of the missile head after the rotation. Depending on the angle of rotation, the rotation angle differs in different quadrant parameters, so we are divided into these four casesQuadrant3,4 quadrant, which rotates only plus or minus 0-180, so the 3,4 quadrant is the negative angleWe'll move him when we show the picture. screen.blit(missiled,(x1-width+(x1-C[0]),y1-height/2+(y1-C[1]))) Here (X1-WIDTH,Y1-HEIGHT/2) is actually in the (X1,Y1)So finally we add the relevant algorithm code,

Topic转圈打印矩阵Java codePackage com.lizhouwei.chapter8;/** * @Description: Circular print Matrix * @Author: Lizhouwei * @CreateDate: 2018/4/28 21:52 * @Modify by : * @ModifyDate: */public class Chapter8_1 {public void Printmatrix (int[][] matrix) {int TR = 0; int TC = 0; int DR = matrix.length-1; int DC = matrix[0].length-1; while (TR ResultsCode interview guide for Programmers eighth chapter array and matrix problem

hardware and Python, it is possible to load, process and extract arbitrary statistics from 1 billion of rows of data within a reasonable time,Results:Compare Google (without any baseline adjustments):More filtering Logic-tube.skip_unless () is a relatively simple way to filter rows, but lacks the ability to combine conditions (and/or/not). This can reduce the volume of data loading faster, under some use cases.Better string matching-the simple tests are as follows: StartsWith, EndsWith, contain

. Avoid synchronization2. Synchronize the interface with a synchronous wrapper3. If the method contains several important operations that do not require synchronization, do not synchronize the entire method4. Avoid unnecessary synchronization when reading and writing instance variables5. Use Notify () instead of Notifyall ()6. Use double check mode for synchronous initializationEfficiency1. Initialize with lazy2. Avoid creating unnecessary objects3. Reinitialize and re-use objects, try not to cr

section, Elf according to segment to divide　　The Elf executable introduces a concept of "Segment", a Segment containing one or more "section" with similar properties.View a section of an elf executable file:　　Check out this segment:In general,segment and section are divided into an elf file from different angles. In the elf called different Views (view) from the section perspective elf files are linked views (linking view) from a segment perspective is the execution view (execution view)segment

The attitude of this article: Simple StupidWeak reference Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed. Weak references is most often used to implement canonicalizing mappings. A weak reference does not prevent the object it references from becoming finalizable, finalized state, and eventually being recycled by GC.Finalizer method: This method is executed before the GC reclaims the object, which is generall

.char variable?Save Unicode to save Chinese characters20. Start a thread with run () or start ()?Start ();Run () put the executed code insideThird, intermediate simple answerWhat is the difference between 21.sleep () and wait ()?Sleep to the time to wake upWaiting to wake up22.JDBC How do transactions work?Set JDBC Auto-commit false to open transactions after multiple transactions commit exception rollback rollbackHow do I access the database in 23.Java?Register driver Get ConnectionmanageObtain

informationOptimization capabilitiesCode specification, code management:Have their own code specification system, code readability goodBroad knowledge Surface:Understand a variety of network products and features, understand a variety of middleware, can know where the pit, deep understanding of the advantages and disadvantages of various technical solutions, understand the integration of various resources and achieve the best .... Understand all kinds of technology and application scenarios, ha

and meters"meter = meter ()foot = foot ()SummarizeThe goal of this guide is for anyone to be able to read it, regardless of whether they have Python or object-oriented programming experience. If you are preparing to learn python, you have gained valuable knowledge of writing rich, elegant, easy-to-use classes. If you are an intermediate Python programmer, you may have picked up some concepts, strategies, and some good ways to reduce the amount of code you write. If you are a Python expert, you

acquire a dictionary of weapons.The result of the final operation:In fact, can continue to extend the, can be made into an app, and then check out the installed, write a good-looking interface! The feeling is a very good app,emmmmm can be similar to the previous LOL box.The Python learning route is divided into three main stages: basic-advanced-framework-project combatBasic first Stage: understanding of basic python. Basic second stage face to object programming (emphasis on programming ability

[]={ 49,38,65,97,76,13,27,49,78,34,12,64,5,4,62,99,98,54,56,17,18,23,34,15,35,25,53,51}; Public Mergingsort () {sort (a,0,a.length-1); for (int i=0;i8. Base Order(1) The basic idea: to unify all the values to be compared (positive integers) to the same digit length, the number of the short number of the first complement 0. Then, start with the lowest bit and order one at a time. Thus, from the lowest bit to the highest order, the sequence becomes an ordered series.(2) Example:(3) Implemen

Java blog author. Lukas eder:data geekery (JOOQ) founder and CEO. Mario Fusco:redhatter, jug Coordinator, active lecturer and author. Mark Reinhold:oracle, chief architect, Java Platform Development Group. Martijn Verburg:london JUG Co-Leader, speakers, writers, Java champion, etc. OPENJDK:OPENJDK official account. Reza Rahman:java EE, GlassFish, WebLogic preacher, writer, speaker, open source hacker. Simon Maple:java Champion, Virtualjug founder, LJC leader, rebellabs author. S

' fstab ' file, which records the mounted hard drive. It is in the ' etc ' directory, and the directory is in the root directory, and you can only modify the file as a superuser. In most distributions, you can use ' Su ' to become root. For example, on openSUSE, I want to be root, because I want to work in the root directory, you can use one of the following commands:sudo Su -OrSu -The command will ask for a password, and then you will have root privileges. Remember: Don't run the system as roo

does not need any changes.By using the up-to-turn type, we can program for abstraction, focus on the logic design of the program upfront, and then inherit the abstract class or interface from the subclass　　The implementation of specific functions, or sub-class can be written to other people to write, to achieve the effect of parallel development software, so as to improve the speed of software development, perhaps this is the team to develop software to take the method of it.This is object-orie