Programmer Think

0. Introduction The data synchronization from mysql to es involves the data synchronization of parent-child tables. It is hereby recorded for subsequent reference For details on synchronizing mysql to es, please refer to my previous blog: Elastic actual combat: through canal1 1.5 realize mysql8 0 data increment / full synchronization to elast ...

SSM framework integrates Alipay sandbox First, Sandbox service into the management center of Alipay open platform. website: https://open.alipay.com/ 2, Set RSA2(SHA256) key 1, Download Alipay Development Assistant website: https://opendocs.alipay.com/open/291/introduce 2. Generate key 3, copy the public key to set up the RSA2(SH ...

Main technologies: Java, springmvc, VUE, node JS, mybatis, mysql, tomcat, jquery, layui, bootstrap, JavaScript, html, css, jsp, log4j and other common basic technologies. The main module functions include: Administrator user login: user login. User information: the list view, modification and deletion of user information data, and the corre ...

1, MHA theory 1. MHA definition MHA (MasterHigh Availability) is a set of excellent software for failover and master-slave replication in MySQL high availability environment.The emergence of MHA is to solve the problem of MySQL single point.During MySQL failover, MHA can automatically complete the failover operation within 0-30 seconds.MH ...

seata distributed transaction of spring cloud Alibaba The construction of seata distributed transactions is scattered on the Internet, and there are always problems. Today, a chapter on building cases is published. This chapter is based on springcloud + Nacos + seate1 2 + MySQL build 1. First download seate1 Version 2 code and seate serve ...

Inner connection and outer connection The courseware comes from station b, Shangsi valley. Please move to station b for details All note links Inner join: merge the rows of multiple tables with the same column. The result set only contains the matching rows in the table #The following is the inner connection of MySQL 92: the result set is th ...

Grouping data This chapter describes how to group data so that you can summarize a subset of table content. This involves two new SELECT sentences, GROUP BY and HAVING clauses. Data grouping Last chapter( MySQL must know and know - Chapter 12 summary data )We use SQL aggregate functions to aggregate data. This allows us to count, calculate a ...

Catalog 1. Main functions 2. Development environment 3. Database Structure 4. Design and Implementation 4.1 Login and Registration 4.2 person information modifications 4.3 Background Notification Management 4.4 Mail Sending 4.5 Evaluation Management 1. Main functions 1. Implement the basic function of adding, deleting, and check ...

MySQL advanced supplement insert INSERT is used when inserting data into the table. In MySQL, it is data that can be inserted (lookup result table), but the order type of each column of the result table must be the same as that of each column of the table to be inserted, such as: --Create a file named jstudents Tables, storage id And nam ...

Recently, I asked some questions about the lock in the interview. Today, I will make a further test and summary on the lock.   Meaning of lock mode: 9: Intentional exclusive lock10: Lock the gap between the record itself and before the record, exclusiveS: Lock the record itself and the gap before the record, and shareX,REC_NOT_GAP: loc ...