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What is business? A group of sql operations related to the same data source are either completed or failed. What are the characteristics of transactions? Atomicity: success or failure Consistency: offset each other (e.g. seller + 200, buyer-200) Isolation: no interference between two parallel trans ...

Hello, everyone. I'm yours Must ask Sister Q. What interesting and challenging topics did sister Q find today? Let's have a look. Q1: How can Scrapy get the browser's temporary cookie s? Problem Description: How does the script get the same temporary cookie s as the browser? For example, lv's offici ...

Several key words of search scoring calculation TF: token frequency, the number of times a search field appears in the field (the field to be searched) in the document after segmentation IDF: inverse document frequency, reverse the frequency of a search field in all documents TFNORM: token frequency normalized BM25: algorithm: (freq + k ...

1, Development tools This platform uses Python programming language, uses Flask and Bootstrap framework, develops under Windows 10 operating system, uses Pycharm development environment, front-end development uses HTML+CSS+JS mode, database uses MySQL database, browser uses Google Chrome. 2, Demand ...

step Import jar package Import c3p0-0.9.5.2.jar and mchange-commons-java-0.2.12.jar Define profileName: c3p0.properties or c3p0-config.xmlPath: put the file directly in the src directory <c3p0-config> <!-- Read connection pool objects using the default configuration --> <default- ...

The following article is from universal repair laboratory, Mr. Gong In January 2020, in addition to the coronavirus whose source information is like a mystery story, MySQL officially released a new version of 8.0.19, and the biggest highlight is the ReplicaSet function. InnoDBReplicaSet consists of a primary database and multiple secondary da ...

A few days ago, Leng Yue wrote a blog post "php basic programming - php connection to mysql database - simple use of mysqli". After learning, many small partners know the connection between php and mysql database. Today, Leng Yue shares a simple paging example First, let's look at the effect: This case is very simple, so how can we ...

MySQL Configuration and Installation Project Official: https://downloads.mariadb.org/mariadb/repositories/ Domestic Mirror: https://mirrors.tuna.tsinghua.edu.cn/mariadb/yum/ https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/ RPM Package Install MySQL CentOS 7 and above: Installation CD-ROM directly ava ...

Setting up local environment records for virtual machine 1.vmware installation 1. Enter the vm website, Download page 2. Select trial, or log in 3. installation 4. Input the secret key Baidu to test UG5J2-0ME12-M89WY-NPWXX-WQH88 on February 13, 2020 2. Installation of VMware centos7 1. Download ce ...

1. JDBC Driver JDBC-driven loading: 1. Loading through containers: For Java applications with containers, the corresponding driver jar packages can be placed directly in the lib directory of the container, such as web applications using Tomcat as a container, and the driver can be copied to the lib subdirectory of tomcat. 2. Application Runtim ...