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Mybatis Plus quick get start maven configuration <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0. ...

There are many ways of MySQL master-slave replication. This paper mainly demonstrates the master-slave replication based on binlog. Principle of MySQL master-slave replication (also known as A/B replication) The Master records the data changes in the binary log, that is, the file specified in the configuration file log bin, These records are ...

Author: wuXing QQ:1226032602 E-mail:1226032602@qq.com https://dev.mysql.com/doc/refman/5.7/en/replication-implementation-details.html mysql replication working principle replication is a high availability solution provided by mysql. 1. The master records the data changes in the binary log 2. Request the master library to establish a c ...

[tcallusdb knowledge base] restfulapi2 0 for list table - [Pb] listgetallrecords2 0 Introductionbrief introductionQuery all records under the corresponding Key in the List PB table, and Limit the number of records returned each time through Limit and Offset.Limit: limit the number of records returned. If the limit is - 1, all records will be re ...

32 please send the last of all employees in the employees table_ Name and first_name is spliced together as name, separated by a space in the middle select concat(last_name,' ',first_name) from employees; Parsing, two string connection methods: mysql CONCAT(str1,str2,...) and CONCAT_WS(separator,str1,str2,…) 33 table building crea ...

version: postgresql10.17 0 summary summary leaf page If the level 0 page (the bottom page) has a right brother, the first one is the first one of the right brothers (it should be the last one on this page. Note that this one does not belong to this page, but the smallest one on the next page is worth copying). Note: the leftmost page of ...

Complex multi table query -- Taking supermarket transaction data as an example The previous content is basically based on the query operation of single table, but in practical work, the data is often scattered in multiple tables. At this time, we need to use the knowledge of multi table query. Generally speaking, there are two main types of m ...

Build linux + nginx + PHP FPM MySQL (MariaDB) environment 1.Linux selects centos7 installed before Thoughts on security reinforcement of mainframe based on CentOS 7 Although there are a lot of data summary and reference here, what you can remember is that you know the significance of reinforcement. In other words, you have really attac ...

Database notes 1 1. Relationship between SQL, DB and DBMS DB: the DataBase exists as a file on the hard disk SQL: structured query language, high-level language, compiled and executed DBMS: DataBase Manager System Mysql, SQLservice, Oracle, DB2, Syba se Relationship: DBMS executes SQL statements and then operates DB data 2. Tables and g ...

Article catalogue SQL Birth of SQL Standardization SQL:2019 SQL:2016 SQL:2011 SQL:2008 SQL:2006 SQL:2003 SQL:1999 SQL-92 Language characteristics Statement classification SQL realization NewSQL The birth of SQL It was a summer in ...