学生（学号，姓名，性别，出生日期，籍贯，民族，所在班级）； 课程（课程号，课程名，学分，开课学期，课程介绍，选课人数）； 选课（学号，课程号，成绩）。 基于MyBatis和Spring实现以下功能： 编写程序创建选课表并向其中添加3条记录；

// 首先定义实体类
public class Student {
    private String id;
    private String name;
    private String gender;
    private Date birthday;
    private String nativePlace;
    private String nation;
    private String className;
    // 省略getter和setter方法
}

public class Course {
    private String id;
    private String name;
    private int credit;
    private String term;
    private String introduction;
    private int selectedNum;
    // 省略getter和setter方法
}

public class Selection {
    private String studentId;
    private String courseId;
    private int score;
    // 省略getter和setter方法
}

// 然后定义Mapper接口
public interface StudentMapper {
    void insert(Student student);
}

public interface CourseMapper {
    void insert(Course course);
}

public interface SelectionMapper {
    void insert(Selection selection);
}

// 接着在Spring配置文件中配置数据源和MyBatis的SqlSessionFactory
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/test"/>
    <property name="username" value="root"/>
    <property name="password" value="root"/>
</bean>

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="mapperLocations" value="classpath*:com/example/mapper/*.xml"/>
</bean>

// 最后在Mapper XML文件中编写SQL语句
<!-- StudentMapper.xml -->
<mapper namespace="com.example.mapper.StudentMapper">
    <insert id="insert" parameterType="com.example.entity.Student">
        insert into student(id, name, gender, birthday, native_place, nation, class_name)
        values(#{id}, #{name}, #{gender}, #{birthday}, #{nativePlace}, #{nation}, #{className})
    </insert>
</mapper>

<!-- CourseMapper.xml -->
<mapper namespace="com.example.mapper.CourseMapper">
    <insert id="insert" parameterType="com.example.entity.Course">
        insert into course(id, name, credit, term, introduction, selected_num)
        values(#{id}, #{name}, #{credit}, #{term}, #{introduction}, #{selectedNum})
    </insert>
</mapper>

<!-- SelectionMapper.xml -->
<mapper namespace="com.example.mapper.SelectionMapper">
    <insert id="insert" parameterType="com.example.entity.Selection">
        insert into selection(student_id, course_id, score)
        values(#{studentId}, #{courseId}, #{score})
    </insert>
</mapper>

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