whois entry

MVC series-entry, mvc entry The full name of MVC is Model ViewController, short for model-view-controller. It is a Model of software design, organize Code by means of separation of business logic, data, and interface display, and integrate the business logic into a component to improve and personalize the custom interface and user interaction, you do not need to rewrite the business logic. MVC is uniquely d

Linux entry (1)-Basic commands and linux entry commands This series of Linux beginners are the basic content I have summarized on the basis of "laruence's Linux private house dish", mainly to record my learning process, but also to facilitate your brief understanding. Linux Distribution is Ubuntu rather than CentOS recommended in books. We recommend that you install dual systems instead of virtual machines.

MongoDB entry-add, delete, modify, and query-mongodb entry-add, delete Mongodb has been successfully started in the previous blog: continue. Open another cmd and enter the [mongo] command to open the shell, that is, the mongodb client. The "test" database is connected by default. Here I set the Set (table) as student. Figure 1: 1. Add insert Syntax: db. Set. insert ({"Col1": "column value 1", "Col2": "co

Laravel 5 framework entry (1): laravel framework entry Laravel 5 Chinese document: 1. http://laravel-china.org/docs/5.0 2. http://www.golaravel.com/laravel/docs/5.0/ Default Condition By default, you already have a well-configured PHP + MySQL runtime environment to understand the basics of running PHP websites. After following this tutorial, you will get a basic simple blog system that includes logon, we wi

MySQL entry (3): mysql entry After writing two articles on MySQL getting started, I found that people who write books are still competent. At least people know how to orchestrate the knowledge points they want to talk about, I really don't know where to say it first, so let me know what to say.1. Write SQL In fact, I don't want to write about SQL, because this part is actually very simple. Basically, in col

Django entry record 2: django entry record 1. Create an app, python manage. py startapp appname 2. design the model and edit the model in the appname/directory. 3. Check the modification of the model. python manage. py makemigrations appname 4. automatically perform database migration and synchronize the database structure. python manage. py sqlmigrate 0001 5. Create a new data table named python manag

Thinkphp entry 2 (46) and thinkphp entry 46[Empty Operation Processing] See the following figure: A user accesses an operation that does not exist. Solution: Define the _ empty () method for each controller to process the operation. Solution 2: Define an empty operation [Empty module processing] We use a class, but this class is not included yet. We can use the automatic loading mechanism to process _ autol

Entry to transcription groups (1): software installation and entry to transcriptionHISAT Wget ftp://ftp.ccb.jhu.edu/pub/infphilo/hisat2/downloads/hisat2-2.1.0-source.zipUnzip hisat2-2.1.0-source.zipCd hisat2-2.1.0Make # install g ++ and gcc before using sudo apt installRm-f *. h *. cppSamtools Wget https://github.com/samtools/samtools/releases/download/1.5/samtools-1.5.tar.bz2Tar xvfj samtools-1.5.tar.bz2

Kotlin entry-coroutine internal mechanism, kotlin entry coroutineSuspension Function ?? A new type of function that appears after the coroutine is exposed. A function modified with a special modifier suspend is called a suspension function. A suspended function can only be called in the coroutine and other suspended functions. It cannot be used in other functions. To start a coroutine, it is necessary to su

TypeScript entry-advanced type, typescript entry typeAdvanced Type Crossover type The cross type is to combine multiple types into a new type. The new type has members of these types, and all the features of these types are their complexes, like the Union of a set Example: function extend In this example, jim has the name attribute in Person and the log () method in myLoggable. Union type Union type. It is

MySQL: database entry 3: mysql database entry 1. Logic execution sequence of SQL statements (7) SELECT(8) DISTINCT (1) FROM (3) (2) ON (4) WHERE (5) group by (6) HAVING (9) order by (10) LIMIT 2.Foreign key constraintAdd a foreign key:Alter table person add CONSTRAINT fk_id FOREIGN key (dept_id) REFERENCES dept (did); Delete foreign keyAlter table person drop foreign key fk_id Note: when data is inserted,

MySQL: database entry 2: mysql database entry # To remove a primary key, you must first unincrement the primary key. Alter table info modify id int null, drop PRIMARY key 1. User Permissions1. Create a userCreate user 'hanshe' @ '192. 0.0.1 'IDENTIFIED by '20160901'; -- create a user2. Remove a userDrop user 'hanshe' @ '2014. 0.0.1 '; -- remove a user3. modify a userRENAME user 'hanshe' @ '192. 0.0.1 'to 'h

Java entry (5) -- String/string class, entry String In the previous example, there was a String example. Some friends certainly didn't know what to do. In fact, the String class is a special class in Java, namely the String class. It is not one of the basic data types in Java, but can be used like the basic data type, declarations are the same as initialization operations and are the objects that the progra

Java entry (4) -- array, number of java Entry Articles In the previous article, we introduced an array concept in foreach. arrays are the most common data structures. They are basic data sequences or object sequences encapsulated together with an identifier of the same type. An array is a set of data with the same data type. It can be divided into one-dimensional array, two-dimensional array, and multi-dime

Lucene entry-install and run the Demo program and lucene entry demo program What is Lucene?Lucene is a high-performance and scalable library of information retrieval tools. -Lucene In Action Lucene version: 7.1 1. Download the installation package Https://lucene.apache.org/core/downloads.html Ii. Installation Add four necessary jar packages and paths to CLASSPATH Lucene-7.1.0 \ core \ lucene-core-7.1

Spring entry (3) [transaction control], spring entry transaction control The database needs to be operated during development, and the process of adding, deleting, and modifying operations is one operation. If you need to update multiple tables in a business, the update of any table fails, update of the entire business is a failure. In this case, tables that have been successfully updated must be rolled bac

MAVEN entry (1), MAVEN entry (I. Basic concepts of Maven 　　Maven is a cross-platform project management tool. Mainly serves Java platform-based project construction, dependency management and project information management.1.1. Project Construction The project construction process includes the following steps: clean up a project, compile a project, test a project, generate a test report, package a project,

Java Web: HTML entry and common tags, and Java Web entry tags Overview and functions of HTML: HTML is called HyperText Markup Language. It is a descriptive Markup Language used to describe the display of content in HyperText. Such as the font color and size.Html is short for Hypertext Markup Language and the most basic web page language.Html is a language defined by tags. The code is composed of tags.Basic

Python entry object type and python entry object Python uses an object model to store data. Constructing a value of any type is an object All Python objects have three features: identity, type, and value. Identity: Each object has a unique identity to mark itself. The identity of any object can be obtained using the built-in function id. This value can be considered as the memory address of the object. Type

Qt entry routine (2), qt entry routine This document uses the QtConcurrent: run () function in Qt as an example to describe how to run a function in a separate thread. 1 QtConcurrent: run () QtConcurrent is a namespace that provides high-level interface functions (APIs) to automatically adjust the number of running threads of a program based on the actual number of CPU cores in the current computer. The fol