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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 corres ...

1. Project overview 1.1 SSM framework advantages The framework is easy to use and lightweightLow code intrusionMature community and user base 1.2 introduction to relevant technologies 1.MySQL Table designSQL skillsTransaction and row level locks 2.MyBatis Design and development of DAO layerMyBatis rational useMyBatis and Spring i ...

Composition of database SQL Server database consists of a set of operating system files, which are divided into two categories: data files and log files. 1. Data file: contains data and objects, such as tables, indexes, stored procedures and views. Data file typecharacteristicMaster data fileIt contains database startup information and ...

Query statement (DQL) 1.5. 1 simple query statement Syntax format: select field name 1, field name 2, field name 3 From table name; Tips: Any sql statement that ends with a semicolon sql statements are not case sensitive mysql> select Empno,ENamE from -> emp; +-------+--------+ | Empno | ENamE | +-------+--------+ | 7369 ...

13.1 introduction In the process of program development, we often need a lot of program debugging and troubleshooting. In the beginning stage, we often use South and debug to debug the program. The output information of the console is not detailed enough most of the time, so the log factory was born. We can more easily view the background log ...

1, Slow query log learning 1. What is slow query log? The slow query log of My SQL is a kind of log record provided by MySQL. It is used to record the statements whose response time exceeds the threshold in MySQL, specifically the statements whose running time exceeds long_query_time value, it will be recorded in the slow query log.long_ quer ...

catalogue 1. Primary key constraint Format 1: set when writing fields when creating a table Format 2: create a table in. Declare the primary key constraint after the column Format 3: after creating a table, modify the table structure and declare the columns as primary keys 2 . Unique constraint Format 1: set when writing fields when creat ...

Author: Yang TaotaoSenior database expert, specializing in MySQL for more than ten years. He is good at backup and recovery, SQL tuning, monitoring, operation and maintenance, high availability architecture design related to MySQL, PostgreSQL, MongoDB and other open source databases. At present, he works in aikesheng, providing MySQL related te ...

Welcome to the MySQL technical articles shared by the great SQL community. If you have any questions or want to learn, you can leave a message in the comment area below. After seeing it, you will answer it Percona XtraBackup feature description Percona Xtrabackup backup recovery permission restrictions Create backup users, configura ...

preface Students who have read the Alibaba Java development manual should notice that there is a mandatory specification in the MySQL index specification: This article will analyze why the index on varchar must specify the index length? index structure To understand the reason, we must first have a certain understanding of the index struc ...