scratch coding

Hello everyone, here is "learn the Web series from scratch" and synchronize updates at the following address ... Github:github.com/daotin/web Public number: The top of the Web front Blog Park: http://www.cnblogs.com/lvonve/ csdn:blog.csdn.net/lvonve/ Here I will start with the Web front End 0 Foundation, step-up learning web-related knowledge points, during the period will also share some fun projects. Now let's go to the We

Hello everyone, here is "learn the Web series from scratch" and synchronize updates at the following address ... Github:github.com/daotin/web Public number: The top of the Web front Blog Park: http://www.cnblogs.com/lvonve/ csdn:blog.csdn.net/lvonve/ Here I will start with the Web front End 0 Foundation, step-up learning web-related knowledge points, during the period will also share some fun projects. Now let's go to the We

5 Minute quick build Ethereum Alliance chain from scratch In the process of developing Ethereum Dapp, a test chain is required, previously using TESTRPC or directly connected to Ethereum testnet (Ropsten), but Testrpc has a variety of pits to deal with and Ropsten Testnet is the need to synchronize and wait chunks, quite annoying. A few days ago saw parity 1.5 version after support to establish proof of authority Chains, can directly solve the above p

Hello everyone, here is "learn the Web series from scratch" and synchronize updates at the following address ... Github:github.com/daotin/web Public number: The top of the Web front Blog Park: http://www.cnblogs.com/lvonve/ csdn:blog.csdn.net/lvonve/ Here I will start with the Web front End 0 Foundation, step-up learning web-related knowledge points, during the period will also share some fun projects. Now let's go to the We

ename from the EMP where sal= (select Max (sal) from where deptno=30); 5. Figure out the number of employees and minimum wage for each position select Job,min (SAL), COUNT (*) from the EMP group by job;6. Figure out the average salary and average bonus for each department, each position (average includes no bonus) if the mean bonus is greater than 300, show ' bonus is good ', if the average bonus is 100 to 300, show ' bonus generally ', if the average bonus is less than 100, show "Basic No Bonu

1000 bytes, which can also be re-compiled to change The Blob and text columns will be used Null value is allowed in the column of the index All numeric keys are stored in the highest byte priority to allow a higher index compression Auto_increnent column updates for each MYISAM type table are faster Data files and index files can be placed in different directories Each character column can have a different character set The flag with varchar can

A little bit familiar with Django inside the data operation, found that met a lot of problems.Django's manipulation of the data is a code-style operation.It's normal to start creating parameters for a table in models, like Username,password, and then use Makemigrations, migrations to create the fields. The fields I created also appear in the database. But when I add a field in the table to find that it is not updated in the database, this is very annoying ah ....Baidu for a long time found that

access permissions for host names, user names, and database combinations Mysqladmin: Client program to perform administrative operations Mysqlbinlog: Tool to read statements from binary logs Mysqlbinlog: checking, repairing, analyzing, and optimizing Table maintenance client Programs Mysqldump: Client program to dump MySQL database to a file Mysqlhotcopy: Quick backup of MyISAM or ISAM tools when the server is running MySQL import: Use the load DA

could be-a NFS exported drive so the FTP is isn't needed on step 2. Split Mirror is also a valid approach for backup.2. On the STANDBY machine:-FTP The backup image (from the primary machine) to the STANDBY machine-DB2 "RESTORE Database -Set up HADR cfg parameters on standby databaseDB2 Update DB CFG for DB2 Update DB CFG for DB2 Update DB CFG for DB2 Update DB CFG for DB2 Update DB CFG for -Start up HADR on standby serverDB2 start HADR on database 3. On the PRIMARY machine:-Start up HADR on th

,revoke,commit,rollback 6. Database Access Technology ODBC (Open database interconnect) passes a common interface for accessing different databases A standard way to connect a database to a Java application using a JDBC (Java database connection) 7. What is MySQL MySQL is a small relational database management system, compared with other large data u management systems such as Oracle,db2,sql server. MySQL is small and has limited functionality, but it is small, fast, low cost, and it provides fu

is self-brought, not built)Index.ejs:Login.ejs:Loginout.ejs:Homepage.ejs:3. Configure the route at Routes Index.js:varExpress = require (' Express ');varRouter =Express. Router ();varMongoose = require (' Mongoose '));varuser = require ('.. /models/user '). User;mongoose.connect (' Mongodb://localhost/admin '); /*GET home page.*/Router.get (‘/‘,function(req, res) {Res.render (' Index ', {title: ' Index ' });}); /*Login*/Router.get ('/login ',function(req, res) {Res.render (' Login ', {title: '

/50x.html; Location=/50x.HTML {root HTML; } #Proxy The PHP scripts to Apache listening on 127.0.0.1:80 # #Location ~ \.php$ { #Proxy_pass http://127.0.0.1; #} #Pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000 #Location ~ \.php (. *) $ {fastcgi_pass127.0.0.1:9000; Fastcgi_index Index.PHP; Fastcgi_split_path_info^((? U). +\.php) (/?. +)$; Fastcgi_param Script_filename$document _root$fastcgi_script_name; Fastcgi_param Path_info$fast

Redis is a memory-based database with all the data stored in memory. So how to optimize storage and reduce memory footprint is a very important topic. Thin key names and key values are the most intuitive way to reduce memory footprint, such as changing the key name Very.important.person:20 to Vip:20. But sometimes the space that is reduced only by the thin key name and the key value is not enough to satisfy the requirement, then you need to save more space according to the REDIS internal

C ++ starts from scratch (2) -- What is an expression? This is the beginning of this series. When learning English, the first thing to learn is letters, which is the basis of English. Similarly, in C ++, all code is composed of identifier, expression, statement, and necessary symbols (such as braces, this section describes what an identifier is. Identifier An identifier is a letter sequence consisting of uppercase/lowercase English letters, undersco

C ++ from scratch (8) -- C ++ Example 1 The previous section describes some implementation methods of the function, but does not explain the syntax of the function, that is, what is the use of the function and why it is used. For this, this article and the future will be a few scattered, in the "C ++ from the beginning (12)" more detailed description. This article is just about the basic requirements of programmers-getting algorithms and getting cod

C ++ starts from scratch (10) -- What is a class? The previous article explains that the structure only defines the memory layout. class can be written before the type definition operator, that isClassType (class for short), which is no different from the structure (only a small difference, as described in the next article, actually, C ++ is extended from C. The class is a very important concept proposed by C ++. It only retains the struct keyword f

Raspberry Pi (Raspberry Pi) builds a Linux system (PiLFS) from scratch (I), raspberrypilfs I. Preparations 1. Raspberry Pi motherboard with Linux host system installed, refer to Raspberry Pi (Raspberry Pi) to install Raspbian (no router, no Monitor) 2. Reference URL: Linux From Scratch on the Raspberry Pi 3. Reference URL: Linux From Scratch Version Development

Atitit. html5 scratch card gui implementation Summary # ---- Two cases canvas or wScratchPad-1.4.4 1 # ---- 1. Add the panel. The height and width of the ten mask div ...... postion: absolti... are both 100% and. # --- 2. initialize wScratchPad 1 # ----- Determine whether the lucky draw opportunity has been used up and the mask has been scratched 33% and the mask .. 2 is automatically cleared # ----- Set the events after the mask image is loaded (in

There 's a lot of talk about "leveling the pie" meaning: To draw a cake from a flat ground, the actor plays in it, as if to pull out a cake. Have self-reliance, independence, the idea of starting from scratch. Entrepreneurship is a lot of time to start from scratch, so we need innovation. Site selection is the first step, and I made the first mistake.Back to Beijing Zhongguancun, I first rented a house, Liu

Android tutorial-step-by-step SDK access from scratch Access the SDK step by step from scratch This blog will summarize some of my experiences and methods in accessing the mobile game channel SDK. It provides a reference for kids who want to access the mobile game channel or want to learn how to access the SDK. This blog is based on the Android platform. I will organize the IOS SDK access methods in the fu