StudentRecord.sol

// SPDX-License-Identifier: MIT

// @author Johnson Marvelous
// @title Student Records

pragma solidity ^0.8.0;

contract School {

    // @notice this data type holds the information of students
    struct Student {
        string name;
        uint32 age;
        string gender;
    }

    // @notice this maps the student to strecord
    mapping(uint32 => Student) public STRecord;

    // @notice this holds the address of the admin
    // @dev only the admin can access the student record
    address adminAddress;

    // @notice this stores the number of students in the record
    uint32 public noOfStudents = 0;

    // @notice this initialize the address to the admin
    constructor(address _adminAddress) {
        adminAddress = _adminAddress;
    }

    // @notice this function stores the student details
    // @params _name is the student name
    // @params _gender is the gender type of the student
    // @params _age is the current age of the student
    // @dev only the admin can strore studentDetails
    function storeDetails(string memory _name, string memory _gender, uint32 _age) external onlyOwner {
        Student storage myRecord = STRecord[noOfStudents];
        myRecord.name = _name;
        myRecord.gender = _gender;
        myRecord.age = _age;
        noOfStudents += 1;
    }

    // @notice this function gets the name, gender and age of a particular student
    // @params _id is the id of the student
    // @return this returns a particular student info
    // @dev everyone has access to the student info
    function getName(uint32 _id) external view returns(Student memory) {
        return STRecord[_id];
    }

    // @notice this retricts access to only the owner
    // @dev the person who deployed the contract is by default the admin 
    modifier onlyOwner() {
        require(msg.sender == adminAddress, "Only the admin has access to this");
        _;
    }

    // @notice this function get the names, gender and age of all the student in the student record
    // @return this returns all the student info
    // @dev everyone has access to the student info
    function getNames() external view returns(Student[] memory) {
        Student[] memory studentList = new Student[](noOfStudents);
        for (uint32 i = 0; i < noOfStudents; i++) {
            studentList[i] = STRecord[i];
        }

        return studentList;
    }

    // @notice this function removes a student for the student record
    // @params _id is the id of the student you want to remove
    // @dev only the admin can remove a student
    function deleteStudent(uint32 _id) external onlyOwner {
        Student storage myRecord = STRecord[_id];
        myRecord.name = STRecord[noOfStudents - 1].name;
        myRecord.gender = STRecord[noOfStudents - 1].gender;
        myRecord.age = STRecord[noOfStudents - 1].age;

        Student storage myRecordL = STRecord[noOfStudents - 1];
        myRecordL.name = "";
        myRecordL.gender = "";
        myRecordL.age = 0;

        noOfStudents -= 1;
        
    }

}