MySQL创建学生信息库代码

好的，以下是一个简单的MySQL创建学生信息库的代码：

CREATE DATABASE students;

USE students;

CREATE TABLE student (
  id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(255),
  age INT,
  gender VARCHAR(10),
  grade VARCHAR(10)
);

在上面的代码中，我们首先创建了一个名为“students”的数据库，然后使用该数据库。接着，我们创建了一个名为“student”的表，包含学生的姓名、年龄、性别和年级。其中，id字段为自增长主键，保证每个学生的id唯一。请注意，这只是一个简单的例子，实际应用中可能需要更多的字段和更复杂的表结构。

相关问题

mysql学生管理系统简单代码

当然可以！下面是一个简单的MySQL学生管理系统的代码示例：

import mysql.connector

# 连接数据库
mydb = mysql.connector.connect(
  host="localhost",
  user="yourusername",
  password="yourpassword",
  database="students"
)

# 创建学生表
mycursor = mydb.cursor()
mycursor.execute("CREATE TABLE students (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255), age INT)")

# 插入学生数据
sql = "INSERT INTO students (name, age) VALUES (%s, %s)"
val = ("John", 20)
mycursor.execute(sql, val)
mydb.commit()
print(mycursor.rowcount, "record inserted.")

# 查询学生数据
mycursor.execute("SELECT * FROM students")
result = mycursor.fetchall()
for row in result:
  print(row)

# 更新学生数据
sql = "UPDATE students SET age = %s WHERE name = %s"
val = (21, "John")
mycursor.execute(sql, val)
mydb.commit()
print(mycursor.rowcount, "record(s) updated.")

# 删除学生数据
sql = "DELETE FROM students WHERE name = %s"
val = ("John",)
mycursor.execute(sql, val)
mydb.commit()
print(mycursor.rowcount, "record(s) deleted.")

# 关闭数据库连接
mydb.close()

这段代码使用了Python的`mysql.connector`库来连接MySQL数据库，并进行学生信息的增删改查操作。你需要将`yourusername`和`yourpassword`替换为你自己的MySQL用户名和密码，同时确保已经创建了名为`students`的数据库。

intellij idea+mysql实现学生库管理系统代码

以下是一个简单的学生库管理系统示例代码，使用Java编写，并使用IntelliJ IDEA作为开发环境，MySQL作为数据库。

首先，创建一个名为“StudentManagement”的项目，并添加以下依赖项：

- MySQL Connector/J
- JBCrypt

接下来，创建一个名为“Student”的模型类，表示学生信息：

public class Student {
    private int id;
    private String name;
    private int age;
    private String gender;
    private String major;
    
    // 构造函数
    public Student(int id, String name, int age, String gender, String major) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.major = major;
    }
    
    // getter 和 setter 方法
    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 getAge() {
        return age;
    }
    
    public void setAge(int age) {
        this.age = age;
    }
    
    public String getGender() {
        return gender;
    }
    
    public void setGender(String gender) {
        this.gender = gender;
    }
    
    public String getMajor() {
        return major;
    }
    
    public void setMajor(String major) {
        this.major = major;
    }
}

接下来，创建一个名为“DatabaseConnection”的类，负责连接到MySQL数据库：

import java.sql.*;

public class DatabaseConnection {
    private static final String URL = "jdbc:mysql://localhost:3306/student_management";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "password";
    
    private Connection conn;
    
    public DatabaseConnection() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }
    }
    
    public Connection getConnection() {
        return conn;
    }
}

然后，创建一个名为“StudentDao”的数据访问对象类，用于执行与学生相关的数据库操作：

import org.mindrot.jbcrypt.BCrypt;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

public class StudentDao {
    private Connection conn;
    
    public StudentDao() {
        conn = new DatabaseConnection().getConnection();
    }
    
    // 添加学生
    public void addStudent(Student student) {
        String sql = "INSERT INTO students(name, age, gender, major) VALUES (?, ?, ?, ?)";
        
        try {
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1, student.getName());
            ps.setInt(2, student.getAge());
            ps.setString(3, student.getGender());
            ps.setString(4, student.getMajor());
            
            ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    // 根据ID查找学生
    public Student getStudentById(int id) {
        String sql = "SELECT * FROM students WHERE id=?";
        Student student = null;
        
        try {
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setInt(1, id);
            
            ResultSet rs = ps.executeQuery();
            
            if (rs.next()) {
                student = new Student(
                        rs.getInt("id"),
                        rs.getString("name"),
                        rs.getInt("age"),
                        rs.getString("gender"),
                        rs.getString("major")
                );
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        
        return student;
    }
    
    // 获取所有学生
    public List<Student> getAllStudents() {
        String sql = "SELECT * FROM students";
        List<Student> students = new ArrayList<>();
        
        try {
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery(sql);
            
            while (rs.next()) {
                Student student = new Student(
                        rs.getInt("id"),
                        rs.getString("name"),
                        rs.getInt("age"),
                        rs.getString("gender"),
                        rs.getString("major")
                );
                students.add(student);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        
        return students;
    }
    
    // 更新学生信息
    public void updateStudent(Student student) {
        String sql = "UPDATE students SET name=?, age=?, gender=?, major=? WHERE id=?";
        
        try {
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1, student.getName());
            ps.setInt(2, student.getAge());
            ps.setString(3, student.getGender());
            ps.setString(4, student.getMajor());
            ps.setInt(5, student.getId());
            
            ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    // 删除学生
    public void deleteStudent(int id) {
        String sql = "DELETE FROM students WHERE id=?";
        
        try {
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setInt(1, id);
            
            ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

最后，创建一个名为“Main”的主程序类，用于演示如何使用StudentDao执行数据库操作：

import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        StudentDao dao = new StudentDao();
        Scanner scanner = new Scanner(System.in);
        
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加学生");
            System.out.println("2. 查找学生");
            System.out.println("3. 查看所有学生");
            System.out.println("4. 更新学生信息");
            System.out.println("5. 删除学生");
            System.out.println("6. 退出程序");
            System.out.print("请输入选项：");
            
            int option = scanner.nextInt();
            
            switch (option) {
                case 1:
                    System.out.print("请输入姓名：");
                    String name = scanner.next();
                    System.out.print("请输入年龄：");
                    int age = scanner.nextInt();
                    System.out.print("请输入性别：");
                    String gender = scanner.next();
                    System.out.print("请输入专业：");
                    String major = scanner.next();
                    
                    Student student = new Student(0, name, age, gender, major);
                    dao.addStudent(student);
                    System.out.println("添加成功！");
                    break;
                    
                case 2:
                    System.out.print("请输入学生ID：");
                    int id = scanner.nextInt();
                    Student studentById = dao.getStudentById(id);
                    
                    if (studentById != null) {
                        System.out.println(studentById);
                    } else {
                        System.out.println("未找到该学生！");
                    }
                    break;
                    
                case 3:
                    List<Student> allStudents = dao.getAllStudents();
                    
                    if (allStudents.size() > 0) {
                        for (Student s : allStudents) {
                            System.out.println(s);
                        }
                    } else {
                        System.out.println("暂无学生！");
                    }
                    break;
                    
                case 4:
                    System.out.print("请输入学生ID：");
                    int updateId = scanner.nextInt();
                    Student updateStudent = dao.getStudentById(updateId);
                    
                    if (updateStudent != null) {
                        System.out.print("请输入姓名（回车不修改）：");
                        String updateName = scanner.next();
                        if (!updateName.isEmpty()) {
                            updateStudent.setName(updateName);
                        }
                        
                        System.out.print("请输入年龄（回车不修改）：");
                        String updateAge = scanner.next();
                        if (!updateAge.isEmpty()) {
                            updateStudent.setAge(Integer.parseInt(updateAge));
                        }
                        
                        System.out.print("请输入性别（回车不修改）：");
                        String updateGender = scanner.next();
                        if (!updateGender.isEmpty()) {
                            updateStudent.setGender(updateGender);
                        }
                        
                        System.out.print("请输入专业（回车不修改）：");
                        String updateMajor = scanner.next();
                        if (!updateMajor.isEmpty()) {
                            updateStudent.setMajor(updateMajor);
                        }
                        
                        dao.updateStudent(updateStudent);
                        System.out.println("更新成功！");
                    } else {
                        System.out.println("未找到该学生！");
                    }
                    break;
                    
                case 5:
                    System.out.print("请输入学生ID：");
                    int deleteId = scanner.nextInt();
                    dao.deleteStudent(deleteId);
                    System.out.println("删除成功！");
                    break;
                    
                case 6:
                    System.exit(0);
                    
                default:
                    System.out.println("无效选项！");
                    break;
            }
        }
    }
}

运行程序，即可使用控制台界面进行学生库管理。