Blockchain - Solidity - GUI - Video

<!DOCTYPE html>

<html lang="en">

<head>

<meta charset="UTF-8">

<meta name="viewport" content="width=device-width, initial-scale=1.0">

<meta http-equiv="X-UA-Compatible" content="ie=edge">

<title>Document</title>

<link rel="stylesheet" type="text/css" href="main.css">

<script src="./node_modules/web3/dist/web3.min.js"></script>

</head>

<body>

<div class="container">

<h1>Coursetro Instructor</h1>

<h2 id="instructor"></h2>

<label for="name" class="col-lg-2 control-label">Instructor Name</label>

<input id="name" type="text">

<label for="name" class="col-lg-2 control-label">Instructor Age</label>

<input id="age" type="text">

<button id="button">Update Instructor</button>

</div>

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>

<script>

if (typeof web3 !== 'undefined') {

web3 = new Web3(web3.currentProvider);

} else {

// set the provider you want from Web3.providers

web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));

}

web3.eth.defaultAccount = web3.eth.accounts[0];

var CoursetroContract = web3.eth.contract([

    {

        "constant": false,

        "inputs": [

            {

                "name": "_fName",

                "type": "string"

            },

            {

                "name": "_age",

                "type": "uint256"

            }

        ],

        "name": "setInstructor",

        "outputs": [],

        "payable": false,

        "type": "function",

        "stateMutability": "nonpayable"

    },

    {

        "constant": true,

        "inputs": [],

        "name": "getInstructor",

        "outputs": [

            {

                "name": "",

                "type": "string"

            },

            {

                "name": "",

                "type": "uint256"

            }

        ],

        "payable": false,

        "type": "function",

        "stateMutability": "view"

    }

]);

var Coursetro = CoursetroContract.at('0xcc74d5766c8d3d611a7db8881fa7d518a2958f75');

console.log(Coursetro);

Coursetro.getInstructor(function(error, result){

if(!error)

{

$("#instructor").html(result[0]+' ('+result[1]+' years old)');

console.log(result);

}

else

console.error(error);

});

$("#button").click(function() {

Coursetro.setInstructor($("#name").val(), $("#age").val());

});

</script>

</body>

</html>

Shiny Table example

library(shiny)
ui <- fluidPage(
   titlePanel("TABLE"),
    sidebarLayout(
      sidebarPanel(
        sliderInput("num", "integer", 1, 20, 1,
                    step = 1, animate =
                      animationOptions(interval=400, loop=TRUE))),
      mainPanel(
        tableOutput("prod")
      )) )
 
server <- function(input, output) {
    output$prod <- renderPrint({ x<-input$num
    for(i in 1:10){
      a=x*i
      cat(x,"x",i,"=",a,"<br>")
       }})}

shinyApp(ui = ui, server = server)

Payroll Solidity

contract Payroll {
    // define variables
    address public CompanyOwner;
   
    uint employeeId;
   
    // create Employee object
    struct Employee {
        uint employeeId;
        address employeeAddress;
        uint wages;
        uint balance;
    }
   
    // employees contain Employee
    Employee[] public employees;
   
    // run this on contract creation just once
    function Payroll() {
        // make CompanyOwner the person who deploys the contract
        CompanyOwner = msg.sender;
        employeeId = 0;
        // add the company owner as an employee with a wage of 0
        AddEmployee(msg.sender, 0);
    }
   
    // function for checking number of employees
    function NumberOfEmployees() returns (uint _numEmployees) {
        return employeeId;
    }
   
    // allows function initiator to withdraw funds if they're an employee equal to their balance
    function WithdrawPayroll() returns (bool _success) {
        var employeeId = GetCurrentEmployeeId();
        if (employeeId != 999999) {
            // they are an employee
            if (employees[employeeId].balance > 0) {
                // if they have a balance
                if (this.balance >= employees[employeeId].balance) {
                    // if the balance of the contract is greater than or equal to employee balance
                    // then send them the money from the contract and set balance back to 0
                    msg.sender.send(employees[employeeId].balance);
                    employees[employeeId].balance = 0;
                    return true;
                } else {
                    return false;
                }
            } else {
                return false;
            }
        } else {
            return false;
        }
    }
   
    function GetCurrentEmployeeId() returns (uint _employeeId) {
        // loop through employees
        for (var i = 0; i < employees.length; i++) {
            // if the initiator of the function's address exists in the employeeAddress area of an Employee, return ID
            if (msg.sender == employees[i].employeeAddress) {
                return employees[i].employeeId;
            }
        }
        return 999999;
    }
   
    // function for getting an ID by address if needed
    function GetEmployeeIdByAddress(address _employee) returns (uint _employeeId) {
        for (var i = 0; i < employees.length; i++) {
            if (_employee == employees[i].employeeAddress) {
                return employees[i].employeeId;
            }
        }
        return 999999;
    }
   
   
    /* OWNER ONLY FUNCTIONS */
    // add an employee given an address and wages
    function AddEmployee(address _employee, uint _wages) returns (bool _success) {
        if (msg.sender != CompanyOwner) {
            return false;
        } else {
            employees.push(Employee(employeeId, _employee, _wages, 0));
            employeeId++;
            return true;
        }
    }
   
    // pay the employee their wages given an employee ID
    function PayEmployee(uint _employeeId) returns (bool _success) {
        if (msg.sender != CompanyOwner) {
            return false;
        } else {
            // TODO: need to figure out how to check to make sure employees[_employeeId] exists
            employees[_employeeId].balance += employees[_employeeId].wages;
            return true;
        }
    }
   
    // modify the employee wages given an employeeId and a new wage
    function ModifyEmployeeWages(uint _employeeId, uint _newWage) returns (bool _success) {
        if (msg.sender != CompanyOwner) {
            return false;
        } else {
            // TODO: need to figure out how to check to make sure employees[_employeeId] exists
            // change employee wages to new wage
            employees[_employeeId].wages = _newWage;
            return true;
        }
    }
   
    // check how much money is in the contract
    function CheckContractBalance() returns (uint _balance) {
        return this.balance;
    }
   
}

Spart link

https://spark.apache.org/examples.html

Spark MR WC

val myfile = sc.textFile("/user/cloudera/input.txt")

val counts = myfile.flatMap(line => line.split(" ")).map(word => (word, 1)).reduceByKey(_ + _)

counts.saveAsTextFile("/home/cloudera/Desktop/output")

MR using JAVA

Source : https://dzone.com/articles/word-count-hello-word-program-in-mapreduce

sqoop dataset

sqoop import --connect jdbc:mysql://localhost:3306/sqoop --username root -P --split-by id --columns id,name --table customer --target-dir /user/cloudera/customer1 --fields-terminated-by “,” --hive-import --create-hive-table --hive-table sqoop.customer1;

Sqoop

1. create database sqoop;

            2.  Use sqoop;

            3. Create table customer( id varchr(3), name varchar(10), age varchar(3), sal  

                integer(6));

            4. insert into values (‘1’,’john’,’45’,45000);

            5. select * from customer