/// <summary>
/// FrmAddProduct()
/// Form Constructor
/// </summary>
/// <param name="businessArg"></param>
public FrmAddProduct(Business businessArg)
{
InitializeComponent();
business = businessArg;
categories = business.Categories;
suppliers = business.Suppliers;
newProduct = new Product();//represents product to be added to database
updatedProduct = new Product();//represents product to be updated in database
}
/// <summary>
/// productReturned()
/// An event handler used to handle events called "eventProductChosen" on FrmCatalog
/// If product is returned, it captures its properties to create an order detail object
/// Order detail object then added to a datagridview control
/// </summary>
/// <param name="product">Object of Product></param>
private void productReturned(Product product)
{
this.Enabled = true;//enable this form
if (product == null)//return if a product is not selected
return;
//add order detail to grid
OrderDetail orderDetail;
const Int16 DEFAULT_QUANTITY = 1;
foreach (DataGridViewRow currentRow in gridViewOrderDetails.Rows)//loop through gridlist
{
orderDetail = (OrderDetail)currentRow.Tag;
//if product exists in datagridview;
if (orderDetail.ProductID == product.ProductID)
{
orderDetail.Quantity += 1;// increase its quantity by 1
currentRow.Cells[colQuantity.Name].Value = orderDetail.Quantity.ToString();//display new value in grid cell
return;//exit method
}
}
//if product does not exist in datagridview already, create new order detail object and set its properties
orderDetail = new OrderDetail();
orderDetail.ProductName = product.ProductName;
orderDetail.ProductID = product.ProductID;
orderDetail.Quantity = DEFAULT_QUANTITY;
orderDetail.UnitPrice = product.UnitPrice;
int rowNum = gridViewOrderDetails.Rows.Add(1);//adds a new row and return its index
DataGridViewRow row = gridViewOrderDetails.Rows[rowNum];//sets row equal to newly created row
//populate cells with order details and product name
row.Cells[colProduct.Name].Value = orderDetail.ProductName;
row.Cells[colProductID.Name].Value = orderDetail.ProductID;
row.Cells[colUnitPrice.Name].Value = orderDetail.UnitPrice.ToString("F");
row.Cells[colQuantity.Name].Value = 1;
row.Tag = orderDetail;
//set first quantity item control for edit
gridViewOrderDetails.CurrentCell = gridViewOrderDetails.Rows[0].Cells[colQuantity.Name];
gridViewOrderDetails.BeginEdit(true);
}
//add product to DB and call delegate
/// <summary>
/// UpdateProduct(Product prod)
/// Update product passed to Products table based on the product ID
/// </summary>
/// <param name="prod"></param>
/// <returns></returns>
public string UpdateProduct(Product prod)
{
String updateQuery = "UPDATE Products "
+ "SET ProductName = " + ((String.IsNullOrEmpty(prod.ProductName)) ? "null" : "\"" + prod.ProductName + "\"")
+ ", SupplierID = " + ((prod.SupplierID == 0) ? "null" : prod.SupplierID.ToString())
+ ", CategoryID = " + ((prod.CategoryID == 0) ? "null" : prod.CategoryID.ToString())
+ ", QuantityPerUnit = " + ((String.IsNullOrEmpty(prod.QuantityPerUnit)) ? "null" : "'" + prod.QuantityPerUnit + "'")
+ ", UnitPrice = " + prod.UnitPrice
+ ", UnitsInStock = " + prod.UnitsInStock
+ ", UnitsOnOrder = " + prod.UnitsOnOrder
+ ", ReorderLevel = " + prod.ReorderLevel
+ ", Discontinued = " + prod.Discontinued
+ " WHERE ProductID = " + prod.ProductID;
OleDbCommand cmUpdate = new OleDbCommand(updateQuery, con);
try
{
con.Open();
cmUpdate.ExecuteNonQuery();
}
catch (Exception)
{
//can't display any error feedback in data access layer
return "Product Updated Failed";
}
finally
{
con.Close();
}
//raise event
if (productAdded_Changed != null)//check to makes sure at least one handler registered
{
productAdded_Changed();
}
return "Product Updated";
}
//add product to DB and call delegate
/// <summary>
/// InsertProduct()
/// Takes a product object and adds a new record to the database table Products
/// </summary>
/// <param name="p">Object of type Product</param>
public string InsertProduct(Product prod)
{
String insertQuery = "INSERT INTO Products (ProductName, SupplierID, CategoryID, "
+ "QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued) VALUES ("
+ ((String.IsNullOrEmpty(prod.ProductName)) ? "null" : "\"" + prod.ProductName + "\"") + ","
+ ((prod.SupplierID == 0) ? "null" : prod.SupplierID.ToString()) + ","
+ ((prod.CategoryID == 0) ? "null" : prod.CategoryID.ToString()) + ","
+ ((String.IsNullOrEmpty(prod.QuantityPerUnit)) ? "null" : "'" + prod.QuantityPerUnit + "'") + ","
+ prod.UnitPrice + ","
+ prod.UnitsInStock + ","
+ prod.UnitsOnOrder + ","
+ prod.ReorderLevel + ","
+ prod.Discontinued + ")";
OleDbCommand cmInsert = new OleDbCommand(insertQuery, con);
try
{
con.Open();
cmInsert.ExecuteNonQuery();
}
catch (Exception)
{
//can't display any error feedback in data access layer
return "Product Added Failed";
}
finally
{
con.Close();
}
//raise event
if (productAdded_Changed != null)//check to makes sure at least one handler registered
{
productAdded_Changed();
}
return "Product Added";
}
/// <summary>
/// productChosen()
/// Handles "eventProductChosen" on FrmCatalog
/// Gets a product from delegate and fills the Update form with its property values.
/// <param name="Product">Object of type Product></param>
private void productChosen(Product product)
{
Enabled = true;//enable this form
selectedProduct = product;
if (selectedProduct == null)//return if there aren't any selected products
return;
errorProvider.SetError(btnCatalog, "");
foreach (Category c in categories)
{
if (selectedProduct.CategoryID == c.CategoryID)
cmbUpdateCategory.SelectedItem = c;
}
foreach (Supplier s in suppliers)
{
if (selectedProduct.CompanyName == s.CompanyName)
cmbUpdateSupplier.SelectedItem = s;
}
toggleInput(true);
tbxUpdateProductName.Text = selectedProduct.ProductName;
tbxUpdateQtyPerUnit.Text = selectedProduct.QuantityPerUnit;
tbxUpdateUnitPrice.Text = selectedProduct.UnitPrice.ToString("F");
tbxUpdateUnitsInStock.Text = selectedProduct.UnitsInStock.ToString();
tbxUpdateUnitsOnOrder.Text = selectedProduct.UnitsOnOrder.ToString();
tbxUpdateReorderLevel.Text = selectedProduct.ReorderLevel.ToString();
chkBoxDiscontinued.Checked = selectedProduct.Discontinued;
}
/// <summary>
/// updateProduct()
/// Updates a record in Products Table
/// </summary>
/// <param name="_product">takes and object of type Product</param>
public string updateProduct(Product _product)
{
string confirmation = database.UpdateProduct(_product);
return confirmation;
}
/// <summary>
/// fetchProducts()
/// Gets product records from database and returns a copy of it
/// </summary>
/// <returns>List of type Product</returns>
public void loadProductData()
{
products = database.FetchProducts();
List<Product> copyProducts = new List<Product>();
Product copy;
foreach (Product p in products)
{
copy = new Product();//create new object
//add properties
copy.ProductID = p.ProductID;
copy.ProductName = p.ProductName;
copy.CategoryID = p.CategoryID;
copy.QuantityPerUnit = p.QuantityPerUnit;
copy.UnitPrice = p.UnitPrice;
copy.UnitsInStock = p.UnitsInStock;
copy.UnitsOnOrder = p.UnitsOnOrder;
copy.ReorderLevel = p.ReorderLevel;
copy.Discontinued = p.Discontinued;
copy.CompanyName = p.CompanyName;
copy.Picture = p.Picture;
copyProducts.Add(copy);//add to new list
products = copyProducts;
}
}
/// <summary>
/// fetchProductByID
/// Takes productID as parameter and returns a Product Object
/// </summary>
/// <param name="productId">of Type int</param>
/// <returns>Product Object</returns>
public Product fetchProductByID(int productId)
{
Product copy;
foreach (Product product in products)
{
if (product.ProductID == productId)
{
copy = new Product();//create new object
copy = product;
return copy;
}
}
return null;
}
/// <summary>
/// addProduct()
/// Adds new record to Products Table
/// </summary>
/// <param name="_product">takes and object of type Product</param>
public string addProduct(Product _product)
{
string confirmation = database.InsertProduct(_product);
return confirmation;
}
/// <summary>
/// btn_OK_Click()
/// Get the product object for each selected item in order to send back to Order form
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_OK_Click(object sender, EventArgs e)
{
foreach (DataGridViewRow row in gridProducts.SelectedRows)//loop through selected items in gridProducts window
{
selectedProduct = (Product)row.Tag; //for each item, capture product associated with the tag
}
Close();
}