Blockchain By Example

CRUD – Read

In the CRUD pattern, the READ operation expresses the action of retrieving, searching, or viewing existing entries. Correspondingly, we define the findPlayer method in the Cplayer contract to read the mapping records based on the primary key (player address) specified as an argument:

function findPlayer(address _address) public view returns (string, uint, address) {    return (players[_address].name, players[_address].PhoneNumber, players[_address].Paddress);}

This simple, magical function will directly access a player's details, by providing only its address without the need of looping through the mapping. Moreover, as you may have noticed, Solidity enables us to return multiple values for a function.

Similarly, if we suppose that ...