写一个合约

// SPDX-License-Identifier: MIT
// Compatible with OpenZeppelin Contracts ^5.0.0
pragma solidity ^0.8.20;

import "@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/CountersUpgradeable.sol";

contract MyContract is Initializable, PausableUpgradeable, OwnableUpgradeable, UUPSUpgradeable {
     using CountersUpgradeable for CountersUpgradeable.Counter;
    CountersUpgradeable.Counter private changeId;
    uint public number;
    // string public name;
    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }

    function initialize(address initialOwner) initializer public {
        __Pausable_init();
        __Ownable_init(initialOwner);
        __UUPSUpgradeable_init();
    }

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
    }

    function updateNumber(uint _number) public returns (uint, uint) {
        number = _number;
        changeId.increment();
        uint id = changeId.current();
        return (number, id);
    }

    //  function addName(string memory _name) public returns (string memory){
    //     name = _name;
    //     return name;
    // }

    function _authorizeUpgrade(address newImplementation)
        internal
        onlyOwner
        override
    {}
}

1. 使用代理部署 并添加拥有者

2. 没有name number为10

3. 使用代理升级部署 填写上面代理的合约地址

4. 合约地址没有变，但是添加了name，并且保存了number的属性值