Simple mapping demo in Solidity.

MappingDemo

pragma solidity 0.5.12;

// Every user will be able to create their account data
// and then retrieve ONLY their record.

contract StructDemo{
    
    // stack variables
    
    struct Person{
        string name;
        string species;
        uint age;
        uint height;
    }
    
    mapping(address => Person) private people;
    
    // functions
    
    function createPerson(string memory name, string memory species, uint age, uint height) public{
        // retrieve user's Ethereum address.
        address creator = msg.sender;
        
        // map input data to user address
        people[creator] = Person(name, species, age, height);
    }
    
    function getPerson() public returns (string memory name, string memory species, uint age, uint height){
        // retrieve user's Ethereum address.
        address creator = msg.sender;
        
        // Can't natively return a structure yet.
        return(people[creator].name, people[creator].species, people[creator].age, people[creator].height);
    }
}