由于这个查询涉及的内容较多且不是单一的问题，我将提供一个简化的示例，展示如何使用Spring Boot和MyBatis结合MySQL数据库来创建一个简单的学习平台管理系统。
- 创建数据库和表：
CREATE DATABASE learning_platform;
USE learning_platform;
CREATE TABLE user (
id INT AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(50) NOT NULL,
password VARCHAR(50) NOT NULL
);- 创建Spring Boot项目，并添加依赖：
<!-- pom.xml -->
<dependencies>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- 其他依赖 -->
</dependencies>- 配置application.properties：
# application.properties
spring.datasource.url=jdbc:mysql://localhost:3306/learning_platform?useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=yourpassword
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
mybatis.mapper-locations=classpath:mapper/*.xml- 创建User实体和Mapper接口：
// User.java
public class User {
private Integer id;
private String username;
private String password;
// getters and setters
}
// UserMapper.java
@Mapper
public interface UserMapper {
User selectByUsername(String username);
// 其他方法
}- 创建UserMapper的XML文件：
<!-- UserMapper.xml -->
<mapper namespace="com.example.mapper.UserMapper">
<select id="selectByUsername" parameterType="String" resultType="com.example.entity.User">
SELECT * FROM user WHERE username = #{username}
</select>
<!-- 其他SQL映射 -->
</mapper>- 创建Service和Controller：
// UserService.java
@Service
public class U