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1. Access to MySQL database It is completed by inputting mysql-uroot-p instruction, where uroot is the user name, and the option of inputting password will be displayed after execution [it@VM_0_12_centos ~]$ mysql -uroot -p Enter password: 2. Display of existing database Type show databases; on the command line to display the ...

score table: CREATE TABLE `score` ( `student_id` int(10) DEFAULT NULL, `class_id` int(10) DEFAULT NULL, `score` int(5) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci Field student ID student ID, class ID: class ID, score: Score Data preparation: insert into score values(1,1,100),(2,1,93 ...

1. Install docker and docker compose centos7 installs docker and docker compose 2. Docker compose common commands # Build the container under the folder containing docker-compose.yml # If you use the Dockerfile to modify the Dockerfile, execute the following again to apply the modification docker-compose up -d # Stop all ...

Version information ubuntu version: 16.04.1 MySQL server version: 5.7.23 install First, check the mysql version available from apt ubuntu@VM-0-4-ubuntu:~$ apt search mysql You can see that there are two package s in the result. We can install MySQL server. You can see that the MySQL server provided is 5.7.23. mysql-client/xenial-security,xenial ...

springboot is very simple to start a transaction, only one annotation is needed @Transactional Just fine. Because in springboot, events have been enabled for jpa, jdbc and mybatis by default. When they are introduced, things will be enabled by default. Of course, if you need to use other orm, such as beatlsql, you need to configure the relevant ...

django mysql model field type 'AutoField': 'integer AUTO_INCREMENT', 'BigAutoField': 'bigint AUTO_INCREMENT', 'BinaryField': 'longblob', 'BooleanField': 'bool', 'CharField': 'varchar(%(max_length)s)', 'CommaSeparatedIntegerField': 'varchar(%(max_length)s)', ...

Source code: GitHub point here || GitEE point here 1, C3P0 connection pool 1. C3P0 introduction C3P0 is an open source JDBC connection pool. The application program initializes the database connection according to the C3P0 configuration, and can automatically reclaim the function of idle connection. 2. Core dependency <dependency> & ...

Introduction to MHA: (1) Introduction At present, MySQL is a relatively mature solution for high availability. It was developed by youshimaton, a Japanese DeNA company (now working for Facebook), and is an excellent set of high availability software for failover and master-slave promotion in MySQL high availability environment.During the MSQL ...

lnmp environment construction Preconditions Operating system installation: CentOS 6.8 64 bit minimum installation. Configure IP, DNS, gateway and host name Configure firewall and open ports 80 and 3306 Close access wall service iptables stop /etc/init.d/iptables restart? Restart the firewall to make the configuration ef ...

Example of scala accessing MySQL database: import java.sql.{Connection,ResultSet,DriverManager} import scala.util.control.Exception.Catch //import java.sql.DriverManager object DataAnalysisTest { def main(args: Array[String]): Unit = { if(args.length!=3) { println("Parameter error!") println("usage metho ...