Python crawler ajax crawls the content of Ma Yun's father's Micro blog

ajax crawling Sometimes when we use Requests to grab the page, the result may be different from what we see in the browser. We can see the normal page data in the browser, but we don't get the result using Requests. The reason is that Requests gets the original HTML document, while the page in the browser is the page passing by again The result ...

Posted on Sat, 22 Feb 2020 12:37:06 -0500 by fifin04

MHA of MySQL high availability cluster

1, MHA introduction At present, MHA (Master High Availability) is a relatively mature solution in the aspect of MySQL high availability. It is developed by yoshimaton (now working for Facebook), a Japanese DeNA company. It is an excellent high availability software for failover and master-slave improvement in MySQL high availability environm ...

Posted on Sat, 22 Feb 2020 12:24:43 -0500 by dahwan

Code implementation phase

1, Encapsulate database operations: store all database operations in the dao package. (1) using single column pattern to design a tool class for database Connection and provide a Connection object. package dao; import com.mysql.jdbc.jdbc2.optional.MysqlDataSource; import javax.sql.DataSource; impo ...

Posted on Sat, 22 Feb 2020 09:07:01 -0500 by Beyond Reality

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

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

jsp to realize simple picture verification code (after login to realize the query database function)

1, Functional analysis of implementation (1) The function of adding the verification code on the landing page plays a certain security role. The login can be realized only when the correct verification code, user name and password are entered. (2) Realize the function of querying database. In the page ...

Posted on Sat, 22 Feb 2020 04:34:39 -0500 by exoduses

Detailed tutorial of Django connecting Mongodb (using mongoengine)

1, Understand MongoDB database? Introduction: MongoDB is written by C + + language. It is an open source database system based on distributed file storage. It is a document oriented database. It is JSON like data format, free and flexible. Advantages: scalable clustering, mass data storage, fast q ...

Posted on Sat, 22 Feb 2020 04:06:55 -0500 by liro

Getting started with Flask

Catalog 1, Architecture introduction 1. What is Flask? 2, Flask form operation 3, What is flask Sqlalchemy? 1. How to configure the database? 2. Define model 3. Model column type 4. Model column properties 5. Data query 6. Paging implementation 7. Flask migrate database migration 1. Model ...

Posted on Sat, 22 Feb 2020 02:50:54 -0500 by Nulletz

Inversion of control and dependency injection in Laravel source code analysis

concept Inversion of Control (IoC) is a design principle in object-oriented programming, which can be used to reduce the coupling between computer codes. It is a programming idea, which can let us design better programs. Dependency injection (DI) is a way to realize IOC. By this way, we can transf ...

Posted on Sat, 22 Feb 2020 01:38:45 -0500 by mickwaffle