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SQL Execution of Mybatis Core Working Principles Learn the structure, working principle and main modules of Mybatis from a macro perspective, and learn the working principle and design idea of Mybatis from a micro perspective. 1. SQL Execution Let's look at the execution of Mybatis's SQL statement. List<User> list = mapper.selectUserL ...

4, Experimental equipment and tools (including software debugging tools) 5, Experimental steps Experiment 1: transplant embedded database sqlite 1 ~ 5: install sqlite database 6: Use of database Method 1: command to manipulate the database Mode 2: program to manipulate the database Outside the experiment (you can see if you a ...

#Mybatis ###First example #####Step 1: Add Mybatis 3.4.5 coordinates, mysql, junit, logj to the pom.xml file Step 2: Write the User entity class. Step 3: Write the SqlMapConfig.xml configuration file (in resources) <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybati ...

Background introduction This article will introduce how to import the data in MySQL into Kafka in the form of Binlog + Canal, and then be consumed by Flink. In order to quickly verify the functionality of the whole process, all components are deployed in a single machine. If you have insufficient physical resources, you can build all the comp ...

Background introduction This article will introduce the case of how to import the data in TiDB into Kafka through TiCDC and then consumed by Flink. In order to quickly verify the functionality of the whole process, all components are deployed in a single machine. If you need to deploy in a production environment, it is recommended to replace ...

17. ST_ClusterWithin ST_ClusterWithin - aggregation. Returns an array of geometric sets, where each geometric set represents a set of geometric sets, and the distance between geometric sets does not exceed the specified distance. 17.1. Summary geometry[] ST_ClusterWithin(geometry set g, float8 distance); 17.2. Description ST_ClusterWithin ...

Video resources SQL injection (11-18) 11. Vulnerability introduction 11.1 PHP method of traversing all files and subfolders under a folder <?php function my_dir($dir) { $files = []; if(@$handle = opendir($dir)) { while(($file = readdir($handle)) !== false) { if($file != ".." && $file != ".") { if(is_dir($dir . " ...

Using terminal to operate MySQL MySQL installation tutorial reference rookie tutorial: https://www.runoob.com/mysql/mysql-install.html Content reference website: https://github.com/hjzCy/sql_node/blob/master/mysql/MySQL%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0.md 1, Basic operation cmd entry method under win: mysql -uroot -p See what da ...

Introduction to MySql: 1. Why use MySQL Data is easily lost in memory The data is in the file, which is not easy to operate 2. Whenever Use a complete management system for unified management and easy query 3. When will it be used Where persistent data storage is required Terminology: DB: the "warehouse" in which a database sto ...

4, Some data processing methods create table Total_Sales (Name char(10),Sales int(5)); insert into Total_Sales values ('zhangsan',10); insert into Total_Sales values ('lisi',15); insert into Total_Sales values ('wangwu',20); insert into Total_Sales values ('zhaoliu',40); insert into Total_Sales values ('sunqi',50); insert into Total_Sales ...