🌚 学生成绩管理系统

score-management-system/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         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>com.cunyu</groupId>
+    <artifactId>score-management-system</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.mybatis</groupId>
+            <artifactId>mybatis</artifactId>
+            <version>3.5.7</version>
+        </dependency>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.25</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.22</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+</project>

score-management-system/src/main/java/Main.java

+import com.cunyu.entity.Student;
+
+import java.util.Scanner;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Package : PACKAGE_NAME
+ * @ClassName : Main.java
+ * @CreateTime : 2022/3/5 17:13
+ * @Version : 1.0
+ * @Author : 村雨
+ * @Email : 747731461@qq.com
+ * @公众号 : 村雨遥
+ * @Website : https://cunyu1943.github.io
+ * @Description :
+ */
+public class Main {
+    public static Scanner scanner = new Scanner(System.in);
+
+    public static void main(String[] args) {
+        while (true) {
+            System.out.println("----------欢迎使用学生成绩管理系统-----------");
+            System.out.println("-------------【1】录入学生成绩-------------");
+            System.out.println("-------------【2】查找学生成绩-------------");
+            System.out.println("-------------【3】修改学生成绩-------------");
+            System.out.println("-------------【4】删除学生成绩-------------");
+            System.out.println("-------------【5】显示所有成绩-------------");
+            System.out.println("-------------【0】退出管理系统-------------");
+
+            Student student = new Student();
+
+            System.out.println("输入你的选择【0-5】");
+            String choice = scanner.next();
+            switch (choice) {
+                case "1":
+                    // 录入学生成绩
+                    student.insertScore();
+                    break;
+                case "2":
+                    // 查找对应学生成绩
+                    student.queryScoreById();
+                    break;
+                case "3":
+                    // 修改学生成绩
+                    student.update();
+                    break;
+                case "4":
+                    // 删除学生成绩
+                    student.delete();
+                    break;
+                case "5":
+                    // 查询所有学生成绩
+                    student.queryScores();
+                    break;
+                case "0":
+                    System.exit(0);
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+}

score-management-system/src/main/java/com/cunyu/entity/Student.java

+package com.cunyu.entity;
+
+import com.cunyu.mapper.StudentMapper;
+import com.cunyu.util.MyBatisUtil;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.apache.ibatis.session.SqlSession;
+
+import java.util.List;
+import java.util.Scanner;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Package : com.cunyu.entity
+ * @ClassName : Student.java
+ * @CreateTime : 2022/3/5 14:38
+ * @Version : 1.0
+ * @Author : 村雨
+ * @Email : 747731461@qq.com
+ * @公众号 : 村雨遥
+ * @Website : https://cunyu1943.github.io
+ * @Description :
+ */
+
+@AllArgsConstructor
+@NoArgsConstructor
+@Data
+public class Student {
+
+
+    /**
+     * 学号
+     */
+    private String id;
+    /**
+     * 姓名
+     */
+    private String name;
+    /**
+     * 班级
+     */
+    private String grade;
+    /**
+     * 高数
+     */
+    private Double math;
+    /**
+     * 体育
+     */
+    private Double sport;
+    /**
+     * 英语
+     */
+    private Double english;
+    /**
+     * Java
+     */
+    private Double java;
+    /**
+     * 算法
+     */
+    private Double algorithm;
+    /**
+     * 政治
+     */
+    private Double polity;
+    /**
+     * C ++
+     */
+    private Double cPlusPlus;
+    /**
+     * 总分
+     */
+    private Double score;
+    /**
+     * 平均分
+     */
+    private Double average;
+
+    /**
+     * 查询学号是否可用
+     *
+     * @param id 学号
+     * @return true：学号重复，false 学号可用
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 17:30 2022/3/5
+     */
+    public boolean isValid(String id) {
+        SqlSession sqlSession = MyBatisUtil.getSession();
+        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
+        List<Student> students = mapper.showStudentList();
+        for (Student student : students) {
+            if (id.equals(student.getId())) {
+                return true;
+            }
+        }
+        sqlSession.close();
+        return false;
+    }
+
+
+    /**
+     * 录入学生成绩
+     *
+     * @param
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 18:05 2022/3/5
+     */
+    public void insertScore() {
+        SqlSession sqlSession = MyBatisUtil.getSession();
+        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("----------录入学生数据----------");
+        System.out.println("请依次输入如下数据：");
+        String id;
+        while (true) {
+            System.out.println("学号");
+            id = scanner.nextLine();
+            if (isValid(id)) {
+                System.out.println("学号重复，请重新输入");
+            } else {
+                break;
+            }
+        }
+        System.out.println("年级");
+        String grade = scanner.nextLine();
+
+        System.out.println("姓名");
+        String name = scanner.nextLine();
+        System.out.println("数学");
+        Double math = scanner.nextDouble();
+        System.out.println("英语");
+        Double english = scanner.nextDouble();
+        System.out.println("体育");
+        Double sport = scanner.nextDouble();
+        System.out.println("Java");
+        Double java = scanner.nextDouble();
+        System.out.println("C++");
+        Double cPlusPlus = scanner.nextDouble();
+        System.out.println("政治");
+        Double polity = scanner.nextDouble();
+        System.out.println("算法");
+        Double algorithm = scanner.nextDouble();
+
+        // 创建对象，并设置属性，并插入数据库
+        Student student = new Student();
+        student.setId(id);
+        student.setName(name);
+        student.setGrade(grade);
+        student.setSport(sport);
+        student.setCPlusPlus(cPlusPlus);
+        student.setJava(java);
+        student.setMath(math);
+        student.setPolity(polity);
+        student.setEnglish(english);
+        student.setAlgorithm(algorithm);
+        student.setScore(math + polity + english + algorithm + cPlusPlus + java + sport);
+        student.setAverage(student.getScore() * 1.0 / 7);
+        int i = mapper.insertScore(student);
+        if (i > 0) {
+            sqlSession.commit();
+            System.out.println("录入成绩成功");
+        } else {
+            System.out.println("录入成绩失败，请重新录入");
+        }
+
+        sqlSession.close();
+
+    }
+
+    /**
+     * 通过学号查询成绩
+     *
+     * @param
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 18:06 2022/3/5
+     */
+    public void queryScoreById() {
+        SqlSession sqlSession = MyBatisUtil.getSession();
+        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("----------查找学生成绩----------");
+        List<Student> students = mapper.showStudentList();
+        Student result = new Student();
+        Boolean flag = false;
+        if (students.size() == 0) {
+            System.out.println("当前无数据，请录入成绩后重试");
+        } else {
+            System.out.println("请输入要查找成绩学生的学号");
+            String id = scanner.nextLine();
+            for (Student student : students) {
+                if (id.equals(student.getId())) {
+                    flag = true;
+                    result = student;
+                }
+            }
+            if (flag) {
+                System.out.println("对应学号的学生成绩如下：");
+                System.out.println("学号\t\t班级\t\t姓名\t\t数学\t\t英语\t\t体育\t\tJava\t\tC++\t\t政治\t\t算法\t\t平均分\t\t总分");
+                System.out.format("%s\t%s\t\t%s\t\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", result.getId(), result.getGrade(), result.getName(), result.getMath(), result.getEnglish(), result.getSport(), result.getJava(), result.getCPlusPlus(), result.getPolity(), result.getAlgorithm(), result.getAverage(), result.getScore());
+                System.out.println("查找成绩成功！");
+            } else {
+                System.out.println("未找到对应学号学生的成绩，请确认后重新输入！");
+            }
+        }
+        sqlSession.close();
+    }
+
+    /**
+     * 查询所有学生成绩
+     *
+     * @param
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 18:26 2022/3/5
+     */
+    public void queryScores() {
+        SqlSession sqlSession = MyBatisUtil.getSession();
+        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
+        List<Student> students = mapper.showStudentList();
+        if (students.size() == 0) {
+            System.out.println("数据库当前无数据，请先添加数据");
+        } else {
+            System.out.println("----------所有学生成绩如下----------");
+            System.out.println("学号\t\t班级\t\t姓名\t\t数学\t\t英语\t\t体育\t\tJava\t\tC++\t\t政治\t\t算法\t\t平均分\t\t总分");
+            for (Student student : students) {
+                System.out.format("%s\t%s\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", student.getId(), student.getGrade(), student.getName(), student.getMath(), student.getEnglish(), student.getSport(), student.getJava(), student.getCPlusPlus(), student.getPolity(), student.getAlgorithm(), student.getAverage(), student.getScore());
+            }
+        }
+        sqlSession.close();
+    }
+
+    /**
+     * 更新对应学号学生的成绩
+     *
+     * @param
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 18:40 2022/3/5
+     */
+    public void update() {
+        SqlSession sqlSession = MyBatisUtil.getSession();
+        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
+        Scanner scanner = new Scanner(System.in);
+        List<Student> students = mapper.showStudentList();
+        System.out.println("----------修改学生成绩----------");
+        if (students.isEmpty()) {
+            System.out.println("当前数据库无数据，请添加后重试");
+        } else {
+            System.out.println("请输入要修改学生的学号");
+            String id = scanner.nextLine();
+            Student student = mapper.queryById(id);
+            if (student == null) {
+                System.out.println("未找到对应学号学生信息，请确认后再删除！");
+            } else {
+                System.out.println("请重新输入该学生的成绩");
+                System.out.println("数学");
+                Double math = scanner.nextDouble();
+                System.out.println("英语");
+                Double english = scanner.nextDouble();
+                System.out.println("体育");
+                Double sport = scanner.nextDouble();
+                System.out.println("Java");
+                Double java = scanner.nextDouble();
+                System.out.println("C++");
+                Double cPlusPlus = scanner.nextDouble();
+                System.out.println("政治");
+                Double polity = scanner.nextDouble();
+                System.out.println("算法");
+                Double algorithm = scanner.nextDouble();
+
+                student.setSport(sport);
+                student.setEnglish(english);
+                student.setPolity(polity);
+                student.setMath(math);
+                student.setJava(java);
+                student.setCPlusPlus(cPlusPlus);
+                student.setAlgorithm(algorithm);
+                student.setScore(sport + math + english + polity + java + cPlusPlus + algorithm);
+                student.setAverage(student.getScore() / 7);
+                if (mapper.updateById(student) > 0) {
+                    sqlSession.commit();
+                    System.out.println("----------更新成功----------");
+                } else {
+                    System.out.println("----------更新失败----------");
+                }
+            }
+        }
+        sqlSession.close();
+    }
+
+    /**
+     * 删除对应学号学生成绩
+     *
+     * @param
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 18:38 2022/3/5
+     */
+    public void delete() {
+        SqlSession sqlSession = MyBatisUtil.getSession();
+        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
+        Scanner scanner = new Scanner(System.in);
+        List<Student> students = mapper.showStudentList();
+        System.out.println("----------删除学生成绩----------");
+        if (students.size() == 0) {
+            System.out.println("当前数据库无数据，请添加后重试");
+        } else {
+            System.out.println("输入要删除学生成绩的学号");
+            String id = scanner.nextLine();
+            if (mapper.queryById(id) == null) {
+                System.out.println("未找到对应学号学生信息，请确认后再删除！");
+            } else {
+                if (mapper.deleteById(id) > 0) {
+                    sqlSession.commit();
+                    System.out.println("----------删除成功----------");
+                } else {
+                    System.out.println("----------删除失败----------");
+                }
+            }
+        }
+        sqlSession.close();
+    }
+}

score-management-system/src/main/java/com/cunyu/mapper/StudentMapper.java

+package com.cunyu.mapper;
+
+import com.cunyu.entity.Student;
+import org.apache.ibatis.annotations.Mapper;
+
+import java.util.List;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Package : com.cunyu.mapper
+ * @ClassName : StudentMapper.java
+ * @CreateTime : 2022/3/5 16:34
+ * @Version : 1.0
+ * @Author : 村雨
+ * @Email : 747731461@qq.com
+ * @公众号 : 村雨遥
+ * @Website : https://cunyu1943.github.io
+ * @Description :
+ */
+@Mapper
+public interface StudentMapper {
+    /**
+     * 录入学生成绩
+     *
+     * @param student 学生对象
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 16:38 2022/3/5
+     */
+    int insertScore(Student student);
+
+    /**
+     * 查看所有学生成绩
+     *
+     * @param
+     * @return List<Student> 学生列表
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 16:45 2022/3/5
+     */
+    public List<Student> showStudentList();
+
+    /**
+     * 通过学号查询学生成绩
+     *
+     * @param id 学号
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 16:50 2022/3/5
+     */
+    public Student queryById(String id);
+
+    /**
+     * 修改对应学号学生的成绩
+     *
+     * @param student 学生
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 16:53 2022/3/5
+     */
+    public int updateById(Student student);
+
+
+    /**
+     * 删除对应学号学生的成绩
+     *
+     * @param id 学号
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 17:02 2022/3/5
+     */
+    public int deleteById(String id);
+}

score-management-system/src/main/java/com/cunyu/util/MyBatisUtil.java

+package com.cunyu.util;
+
+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;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Package : com.cunyu.util
+ * @ClassName : MyBatisUtil.java
+ * @CreateTime : 2022/3/5 17:11
+ * @Version : 1.0
+ * @Author : 村雨
+ * @Email : 747731461@qq.com
+ * @公众号 : 村雨遥
+ * @Website : https://cunyu1943.github.io
+ * @Description :
+ */
+public class MyBatisUtil {
+    private static SqlSessionFactory sqlSessionFactory;
+
+    static {
+        try {
+            String resource = "mybatis-config.xml";
+            InputStream inputStream = Resources.getResourceAsStream(resource);
+            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 获取 SqlSession 连接
+     *
+     * @param
+     * @return
+     * @Author 村雨遥
+     * @Version 1.0
+     * @Description
+     * @Date 17:12 2022/3/5
+     */
+    public static SqlSession getSession() {
+        return sqlSessionFactory.openSession();
+    }
+}

score-management-system/src/main/resources/mapper/StudentMapper.xml

+<?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.cunyu.mapper.StudentMapper">
+
+    <insert id="insertScore" parameterType="com.cunyu.entity.Student">
+        INSERT INTO student (id, name, grade, math, english, sport, polity, java, c_plus_plus, algorithm, score,
+                             average)
+        VALUES (#{id}, #{name}, #{grade}, #{math}, #{english}, #{sport}, #{polity}, #{java}, #{cPlusPlus}, #{algorithm},
+                #{score}, #{average})
+    </insert>
+    <update id="updateById" parameterType="com.cunyu.entity.Student">
+        UPDATE student
+        SET math        = #{math},
+            english     = #{english},
+            sport       = #{sport},
+            polity      = #{polity},
+            java        = #{java},
+            c_plus_plus = #{cPlusPlus},
+            algorithm   = #{algorithm},
+            score       = #{score},
+            average     = #{average}
+        WHERE id = #{id}
+    </update>
+    <delete id="deleteById">
+        DELETE
+        FROM student
+        WHERE id = #{id}
+    </delete>
+    <select id="showStudentList" resultType="com.cunyu.entity.Student">
+        SELECT *
+        FROM student
+    </select>
+
+    <select id="queryById" resultType="com.cunyu.entity.Student">
+        SELECT *
+        FROM student
+        WHERE id = #{id}
+    </select>
+
+</mapper>

score-management-system/src/main/resources/mybatis-config.xml

+<?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>
+    <!--  驼峰命名  -->
+    <settings>
+        <setting name="mapUnderscoreToCamelCase" value="true"/>
+    </settings>
+    <!-- 数据库配置信息 -->
+    <environments default="development">
+        <environment id="development">
+            <transactionManager type="JDBC"/>
+            <dataSource type="POOLED">
+                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
+                <property name="url"
+                          value="jdbc:mysql://localhost:3306/score_management_system?useUnicode=true&amp;characterEncoding=utf-8"/>
+                <property name="username" value="root"/>
+                <property name="password" value="cunyu1943"/>
+            </dataSource>
+        </environment>
+    </environments>
+    <!--  xml 存放路径  -->
+    <mappers>
+        <mapper resource="mapper/StudentMapper.xml"/>
+    </mappers>
+</configuration>