高级 Web 技术实验⼀：基于 MyBatis 的校级课程管理程序

本文链接：https://blog.youkuaiyun.com/m0_70732442/article/details/129742117

该文描述了一个使用MyBatis进行数据库操作的实验，包括创建课程表c_course和学院表s_school，查询特定课程信息，获取计算机学院的课程，更新课程的课时数，新增课程记录，以及输出所有学院的课程信息。实验涉及Java项目配置，MyBatis的XML配置文件，工具类，实体类，DAO接口和Mapper映射文件的编写与测试。

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实验题目

现有⼀个课程表 c_course 和⼀个学院表

, 学院表和课程表之间是⼀对多的关系。课程表和学院表分别如表 1 和表 2 所示。课程表 c_course 表 1:

学院表 s_school 表 2:

请根据以上表的字段及值完成数据库建库及数据初始化的过程，逐步完成以下⼦任务。

1. 查询 id=2 的课程信息；
2. 查询出所有计算机学院开设的课程信息；
3. 将 id=4 这⻔课程的课时数修改为 32+8=40；
4. 插⼊⼀条新的课程记录： names=”⼤数据存储“，hours=32，schools =1；
5. 输出所有的学院开设的课程信息

实验步骤

一、建表

建立c_course表

建立s_school表

二、创建 Java 项目，在 pom.xml 引入依赖

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>mybatis_course</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>course-01</module>
    </modules>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.8</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

</project>

三、在resources下配置mybatis-config.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <typeAlias type="com.mybatis.pojo.User" alias="user"/>
    </typeAliases>
    <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/mybatis-course?useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF-8&amp;severTimezone=UTC"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="UserMapper.xml"/>
    </mappers>
</configuration>

四、在包下创建MyBatisUtils 工具类

package com.mybatis.utils;

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.IOException;
import java.io.InputStream;

public class MyBatisUtils {

    private static SqlSessionFactory sqlSessionFactory;
    // 初始化SqlSessionFactory对象
    static {
        try{
            //使⽤MyBatis提供的Resources类加载MyBatis的配置⽂件
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            // 构建SqlSessionFactory⼯⼚
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        }catch (IOException e){
            e.printStackTrace();
        }
    }
    // 获取SqlSession对象的静态⽅法
    public static SqlSession getSqlSession(){
        return sqlSessionFactory.openSession();
    }
    
}

五、在pojo下创建实体类

package com.mybatis.pojo;

public class User {
    private int id;
    private String name;
    private int hour;
    private int sid;

    public User(int hour, int id) {
        this.hour=hour;
        this.id=id;
    }
    public User(String name,int hour,int sid){
        this.name=name;
        this.hour=hour;
        this.sid=sid;
    }
    public User(int id, String name, int hour, int sid) {
        this.id = id;
        this.name = name;
        this.hour = hour;
        this.sid = sid;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getHours() {
        return hour;
    }

    public void setHours(int hours) {
        this.hour = hour;
    }

    public int getSid() {
        return sid;
    }

    public void setSid(int sid) {
        this.sid = sid;
    }
    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", hour=" + hour +
                ", sid=" + sid +
                ", schoolname='" + schoolname + '\'' +
                '}';
    }

}

六、在dao层创建接口，在resources下写Mapper映射文件

package com.mybatis.dao;

import com.mybatis.pojo.User;

import java.util.List;

public interface UserDao {
    //查询所有
    List<User> getUserList();
    //根据id=2查询
    User getUserById(int id);
    //查询计算机学院开课信息
    List<User> getUserBySid(int sid);
    //将 id=4 这⻔课程的课时数修改为 32+8=40；
    int UpdateById(User user);
    //增加课程
    int getInsert(User user);
     //查询所有
    List<User> getAll();
}

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

<mapper namespace="com.mybatis.dao.UserDao">
    <!--id为接口中的方法名-->

    <select id="getUserById" parameterType="int" resultType="user">
        select * from c_course where id=#{id}
    </select>

    <select id="getUserBySid" parameterType="int" resultType="user">
        select * from c_course where sid=#{sid}
    </select>
    
    <update id="UpdateById" parameterType="int">
        update c_course set hour=#{hour} where id=#{id}
    </update>

    <insert id="getInsert" parameterType="user">
        insert into c_course (name,hour,sid) values(#{name},#{hour},#{sid});
    </insert>

     <select id="getAll" resultType="user">
        select c_course.id,name,hour,sid,s_school.schoolname from c_course,s_school where c_course.sid=s_school.id
    </select>
</mapper>

七、在test文件下创建测试类

package com.mybatis.dao;

import com.mybatis.pojo.User;
import com.mybatis.utils.MyBatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.security.PublicKey;
import java.util.List;

public class UserDaoTest {

    @Test
    public void getUserById(){
        SqlSession sqlSession= MyBatisUtils.getSqlSession();

        UserDao userDao=sqlSession.getMapper(UserDao.class);
        User user=userDao.getUserById(2);
        System.out.println(user);

        sqlSession.close();
    }

    @Test
    public void getUserBySid(){
        SqlSession sqlSession= MyBatisUtils.getSqlSession();

        UserDao userDao=sqlSession.getMapper(UserDao.class);
        List<User> userList=userDao.getUserBySid(1);
        for (User user : userList) {
            System.out.println(user);
        }

        sqlSession.close();
    }

    @Test
    public void UpdateById(){
        SqlSession sqlSession= MyBatisUtils.getSqlSession();
        UserDao userDao=sqlSession.getMapper(UserDao.class);
        userDao.UpdateById(new User(40,4));

        sqlSession.commit();

        sqlSession.close();
    }

    @Test
    public void getInsert(){
        SqlSession sqlSession= MyBatisUtils.getSqlSession();

        UserDao userDao=sqlSession.getMapper(UserDao.class);
        int res=userDao.getInsert(new User("⼤数据存储",32,1));
       if(res>0){
           System.out.println("插入成功！");
       }

        sqlSession.commit();
        sqlSession.close();
    }
    @Test
    public void getAll(){
        SqlSession sqlSession= MyBatisUtils.getSqlSession();
        UserDao userDao=sqlSession.getMapper(UserDao.class);
        List<User> userList=userDao.getAll();

        for (User user : userList) {
            System.out.println(user);
        }

        sqlSession.close();
    }
}
}