medinaisrael-17/bamazon

Amazon counterpart

Bamazon

Bamazon is an "Amazon" counter part that simulates what it is like to be a customer and what it's like to be a manager.

Bamazon Customer

The customer portion allows the user to see a series of items for sale along with their

• Department
• Price
• Amount in stock

As soon as the program opens, we make a connection to the databse.

//make a connection to the database
var connection = mysql.createConnection({
    host: "localhost",

    port: ###,

    user: "****",

    password: "",
    database: ""
});

//when we connect
connection.connect(function(err) {
    if (err) throw err;

    //run the show items function
    showItems();
})

The function showItems() is there to automatically generate each item that is in the database, helping the cutsomer identify the items they wish to buy.

//show items function to render items in the database
function showItems() {
    console.log(chalk.cyan("\nDisplaying all products...\n"));
    //connect to the databse with a query to select all items
    connection.query("SELECT * FROM products", function(err, res) {
        if (err) throw err;

        //render the results in a formatted table
        console.table(res);
        //callback to our menu function
        menu();
    })

}

Next, I run a function called menu() that starts an inquirer to see what the user would like to purchase.

 //inquirer asks for specific information
 inquirer.prompt([
 {
    // The first question should ask them the ID of the product they would like to buy
    name: "id",
    message: "Enter the ID number of the item you wish to buy.",
    validate: function(value) {
        if (isNaN(value) === false) {
            return true;
        }
        return false;
    }
},
{
    // The second message should ask how many units of the product they would like to buy
    name: "quantity",
    message: "How many would you like to buy?",
    validate: function(value) {
        if (isNaN(value) === false) {
            return true;
        }
        return false;
    }
}])

After this, the amount they want to buy is evaluated. If the amount they wish to purchase is less than or equal to the amount in stock, the user is allowed to purchase the item. Otherwise, they are asking for too many of that item and we must display that we do not have enough to meet their request.

Whether they made a purchase, or were told about an insuffciency, the user is asked if they would like to make another purchase or if they want to exit. The database is updated each time the user makes a purchase, allowing for real time interactions and up to date data

if (parseInt(answer.quantity) <= chosenItem.stock_quantity) {
                //the new quantity will be calculated
                var newQuantity = chosenItem.stock_quantity - parseInt(answer.quantity);
                //connect back to the database
                connection.query(
                    //what we want to update
                    "UPDATE products SET ? WHERE ?",
                    [
                        {
                            stock_quantity: newQuantity
                        },
                        {
                            id: chosenItem.id
                        }
                    ],

Bamazon Manager

Bamazon manager allows the user to act as a manager for the company. In this file there are a few choices to choose from after we establish a connection to the database:

• View Products
• View Low Inventory
• Add to Inventory
• Add New Product
• Exit

Each one has their own set of instructions to allow the "manager" to update the database.

View Products

The view products option is similar to way bamazonCustomer.js starts. It will show all the content that is in the databse in a table structure.

View Low Inventory

This option is very helpful to managers. It will connect to the databse and only select items from the databse where an item has less than 5 items in stock.

function viewLowInventory() {
    console.log(chalk.red("\nDisplaying low inventory...\n"));
    connection.query("SELECT * FROM products WHERE stock_quantity < 5", function (err, res) {
        if (err) throw err;

        console.table(res);
        menu();
    })

}

The items appear in a clean, easy to read format that allow the manager to quickly identify which items are low in stock.

Also, after each function, the user is asked what they would like to do next through inquirer.

Add to Inventory

The user also has an option to add to the stock of each item. This is often paired with the View Low Inventory function as it allows the user to add inventory and update the database at the same time.

When you first select it, an inquirer is pulled up asking for the item's unique id and how much of the item you would like to add.

Afterwards, it shows a "success" message, along with how many units you added to that id.

Add New Product

This last function will add a new product into the databse for customers to view and buy. Each item has name, department, price, and stock quantity that must be filled in in order to add it to our database. Inquirer asks for each of these parameters and then uses the answers given to add it to mysql.

inquirer.prompt([
        {
            name: "product_name",
            message: "What is the products name?",
        },
        {
            name: "department_name",
            message: "What department will it be in?"
        },
        {
            name: "price",
            message: "How much does it cost?",
            validate: function (value) {
                if (isNaN(value) === false) {
                    return true;
                }
                return false;
            }
        },
        {
            name: "stock_quantity",
            message: "How many units do you have of this item?",
            validate: function (value) {
                if (isNaN(value) === false) {
                    return true;
                }
                return false;
            }
        }

Using a query, we can easily connect and add it to our database.

connection.query(
            "INSERT INTO products SET ?",
            {
                product_name: answer.product_name,
                department_name: answer.department_name,
                price: answer.price,
                stock_quantity: answer.stock_quantity
            }

Heres what the process looks like.

We can see that it has been added to our database and can now be viewed by the manager and customers.

Exit

The Exit function is an option in the menu that allows the user to exit the program.

else if (answer.choice === "Exit") {
            connection.end();
        }