Guide du débutant : Partez de zéro et apprenez MyBatis étape par étape

CREATE TABLE students (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(255),
    age INT,
    grade VARCHAR(255)
);

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mydatabase"/>
                <property name="username" value="root"/>
                <property name="password" value="password"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mapper/StudentMapper.xml"/>
    </mappers>
</configuration>

import java.util.List;

public interface StudentMapper {

    List<Student> getAllStudents();

    void insertStudent(Student student);

}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.mapper.StudentMapper">

    <select id="getAllStudents" resultType="com.example.model.Student">
        SELECT * FROM students
    </select>

    <insert id="insertStudent" parameterType="com.example.model.Student">
        INSERT INTO students (name, age, grade)
        VALUES (#{name}, #{age}, #{grade})
    </insert>

</mapper>

public class Student {

    private int id;
    private String name;
    private int age;
    private String grade;

    // Getters and setters

}

import com.example.mapper.StudentMapper;
import com.example.model.Student;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.InputStream;
import java.util.List;

public class Main {

    public static void main(String[] args) throws Exception {
        // 读取MyBatis配置文件
        InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
        // 创建SqlSessionFactory对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        // 创建SqlSession对象
        try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
            // 获取Mapper接口的实例
            StudentMapper studentMapper = sqlSession.getMapper(StudentMapper.class);

            // 查询所有学生
            List<Student> students = studentMapper.getAllStudents();
            for (Student student : students) {
                System.out.println(student);
            }

            // 插入一个新学生
            Student newStudent = new Student();
            newStudent.setName("张三");
            newStudent.setAge(20);
            newStudent.setGrade("大一");
            studentMapper.insertStudent(newStudent);
            sqlSession.commit();
        }
    }
}