Crawler basic sharing Scrapy framework flow chart and installation

Developing a crawler program from scratch is a cumbersome work. In order to avoid consuming a lot of time due to manufacturing wheels, we can choose to use some excellent crawler frameworks in practical applications. Using the framework can reduce the development cost, improve the program quality, and enable us to focus on business logic. So, l ...

Posted on Fri, 19 Nov 2021 13:31:38 -0500 by Syphon

Detailed explanation of enterprise log analysis system ELK

Detailed explanation of ELK theory ELK deployment ELK details preface Analysis log is the main means for operation and maintenance engineers to find problems and solve system faults. Logs mainly include system logs, application logs and security logs.Generally, a large-scale system is a distributed deployment architecture. Different s ...

Posted on Fri, 19 Nov 2021 11:04:36 -0500 by twinzen

Brief introduction and implementation of MyBatis detailed explanation framework

MyBatis framework Chapter I framework 1. Three tier architecture mvc: in web development, mvc architecture pattern is used. m: Data, v: view, c: controller c controller: accept the request, call the service object, and display the processing result of the request. The servlet is currently used as the controller v: now use jsp, html, cs ...

Posted on Fri, 19 Nov 2021 10:37:22 -0500 by jponte

jmeter listener can you really use it? Here comes the skill of getting off work an hour early every day~

Students who have used jmeter should be able to use listeners. In each listener, there will be a function of "writing all data to one file". How should this function be used? Today, let's talk about the use of this function. Almost all listeners have such a function. How to use the functions of this listener? Click Browse to open ...

Posted on Fri, 19 Nov 2021 09:01:49 -0500 by waradmin

[crazy God Theory] mysql self-study summary chapter 10

preface This is the self-study notes of crazy God's mysql, which is only for reference, learning and continuous updating The following is a video learning link: https://www.bilibili.com/video/BV1NJ411J79W 10. JDBC (key) 10.1. Database driver Driver: sound card, graphics card, database Our program will deal with the database throug ...

Posted on Fri, 19 Nov 2021 07:26:42 -0500 by lucifer27

Deep understanding ---- creation of JDBC connection pool

throw away a brick in order to get a gem When and when are we talking about the "pool"? I remember the last time it was an IO stream, I created a buffer pool to speed up the read / write speed (actually reducing the number of IO operations) So when will the connection pool be used??? Connection pooling is a technique for cre ...

Posted on Fri, 19 Nov 2021 07:15:50 -0500 by mgoerz

Research on mobile Internet development technology teaching website project part 7

2021@SDUSC Realization of positioning function private LocationClient mLocationClient = null; private MyLocationConfiguration.LocationMode locationMode; private MyLocationConfiguration.LocationMode mLocationMode; For the first time, you need to make preparations and do not configure the Android positioning SDK of Baidu map. You can obtain t ...

Posted on Fri, 19 Nov 2021 06:51:40 -0500 by imurkid

ELK log analysis system

catalogue preface 1, Introduction to ELK log analysis system 1. Composition of ELK log analysis system 2. Log processing steps 2, Introduction to three software 1,Elasticsearch one point one    summary one point two   Core concept 2,Logstash two point one    Logstash introduction two point two    M ...

Posted on Fri, 19 Nov 2021 06:23:13 -0500 by Baez

Nebula Graph source code interpretation series Vol.05 Scheduler and Executor brothers

This article was first published in Nebula Graph Community official accountIn the previous article, we talked about the content of Query Engine Optimizer. In this article, we will explain the remaining Scheduler and Executor parts of Query Engine.summaryIn the execution phase, the execution engine converts the physical execution plan generated ...

Posted on Fri, 19 Nov 2021 04:55:00 -0500 by Tomz

[tcaplus DB knowledge base] Introduction to tcaplus DB local index

[tcaplus DB knowledge base] Introduction to tcaplus DB local index Index description Tcallusdb supports two types of indexes: local indexes and global indexes. Local index: an index based on the tcallusdb primary key field. It is created with the table when it is being created.Global index: an index based on the first level fields (including ...

Posted on Fri, 19 Nov 2021 04:29:02 -0500 by phpshift