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1, Install vmbox and vagrant 1. Download address Vagrant: https://releases.hashicorp.com/vagrant/2.2.5/vagrant_2.2.5_x86_64.msi ==VirtualBox: == https://download.virtualbox.org/virtualbox/6.0.10/VirtualBox-6.0.10-132072-Win.exe Remember to turn on cpu virtualization 2. vagrant initializes the virtual machine CUHK mirror station, such as: ...

prefacestay Mybatis source code - SqlSession access It has been known in the article that when obtaining SqlSession in Mybatis, the Executor will be created and stored in SqlSession. The dynamic proxy object of the mapping interface can be obtained through SqlSession, and the generation of dynamic proxy object can be referred to Mybatis source ...

JDBC core technology JDBC overview Data persistence Persistence: save data to a power down storage device for later use. In most cases, especially for enterprise applications, data persistence means saving the data in memory to the hard disk for "solidification", and the implementation process of persistence is mostly complete ...

Tip: After the article is written, the catalog can be generated automatically, how to generate the help document to the right JDBC: Five ways to get a database connection Before we can get a database connection, we need to do some preparatory work: Import database connection related database drivers (also known as third-party api) into pro ...

Recently, there was a problem with the online ETL data archiving SQL. An UPDATE SQL has not run for two days: update t_order_record set archive_id = '420a7fe7-4767-45e8-a5f5-72280c192faa', update_time = update_time where order_id in (select order_id from t_retailer_order_record force index (idx_archive_id) where archive_id = '420a7fe7-4767-45e ...

Inter bank transfer business is A typical distributed transaction scenario. Assuming that A needs inter-bank transfer to B, the data of two banks are involved. The ACID of transfer cannot be guaranteed through the local transaction of one database, but can only be solved through distributed transactions. Distributed transaction Distributed tr ...

Create Keystone database Create the Keystone database on the MariaDB of the controller: mysql -uroot -p123456 # -u root specifies that the user logging in to mariaDB is root #-P123456 the password for the root user to log in to maraiDB is "123456" Create Keystone database: CREATE DATABASE keystone; Create keystone database ...

Learning notes on common database operations 1, How to create a new table Here is a table for creating user2: CREATE TABLE if NOT EXISTS user2( username VARCHAR(50) not NULL, password VARCHAR(50) NOT NULL, realname VARCHAR(50), phone VARCHAR(50), userid int AUTO_INCREMENT, PRIMARY key(userid) )ENGINE=InnoDB DEFAULT CHARSET=utf8; Ins ...