设计一个学生类，创建相应的数据库表，利用JDBC技术访问数据库，实现学生信息的增删查改。

好的，我可以帮你解答这个问题。

首先，我们需要设计一个学生类，包括学号、姓名、性别、年龄等基本属性。代码如下：

public class Student {
    private int id;
    private String name;
    private String gender;
    private int age;

    public Student(int id, String name, String gender, int age) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    // getter and setter methods
    // ...
}

接下来，我们需要创建相应的数据库表。可以使用以下的 SQL 语句创建一个名为 student 的表：

CREATE TABLE student (
    id INT PRIMARY KEY,
    name VARCHAR(50) NOT NULL,
    gender VARCHAR(10) NOT NULL,
    age INT NOT NULL
);

然后，我们可以使用 JDBC 技术访问数据库，并实现学生信息的增删查改。以下是一个示例代码：

import java.sql.*;

public class StudentDAO {
    private static final String URL = "jdbc:mysql://localhost:3306/test?useSSL=false";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "password";

    public void add(Student student) {
        Connection conn = null;
        PreparedStatement pstmt = null;

        try {
            conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
            String sql = "INSERT INTO student (id, name, gender, age) VALUES (?, ?, ?, ?)";
            pstmt = conn.prepareStatement(sql);
            pstmt.setInt(1, student.getId());
            pstmt.setString(2, student.getName());
            pstmt.setString(3, student.getGender());
            pstmt.setInt(4, student.getAge());
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (pstmt != null) {
                    pstmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public void delete(int id) {
        Connection conn = null;
        PreparedStatement pstmt = null;

        try {
            conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
            String sql = "DELETE FROM student WHERE id = ?";
            pstmt = conn.prepareStatement(sql);
            pstmt.setInt(1, id);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (pstmt != null) {
                    pstmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public void update(Student student) {
        Connection conn = null;
        PreparedStatement pstmt = null;

        try {
            conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
            String sql = "UPDATE student SET name = ?, gender = ?, age = ? WHERE id = ?";
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, student.getName());
            pstmt.setString(2, student.getGender());
            pstmt.setInt(3, student.getAge());
            pstmt.setInt(4, student.getId());
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (pstmt != null) {
                    pstmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public Student getById(int id) {
        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;

        try {
            conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
            String sql = "SELECT * FROM student WHERE id = ?";
            pstmt = conn.prepareStatement(sql);
            pstmt.setInt(1, id);
            rs = pstmt.executeQuery();
            if (rs.next()) {
                String name = rs.getString("name");
                String gender = rs.getString("gender");
                int age = rs.getInt("age");
                return new Student(id, name, gender, age);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (rs != null) {
                    rs.close();
                }
                if (pstmt != null) {
                    pstmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}

上面的代码中，我们定义了一个 StudentDAO 类，其中包含了增加、删除、更新和查询学生信息的方法。我们可以在程序中实例化该类，并调用其方法来操作数据库表。

注意，这里我们使用了PreparedStatement来预编译 SQL 语句，可以有效地防止 SQL 注入攻击。同时，我们在使用完数据库连接、PreparedStatement和ResultSet对象后，需要手动关闭它们，以释放资源。