public bool UpdateProduct(ProductBDO product,
ref string message)
{
ProductBDO productInDB =
GetProduct(product.ProductID);
// invalid product to update
if (productInDB == null)
{
message = "cannot get product for this ID";
return false;
}
// a product can't be discontinued
// if there are non-fulfilled orders
if (product.Discontinued == true
&& productInDB.UnitsOnOrder > 0)
{
message = "cannot discontinue this product";
return false;
}
else
{
/*
// TODO: call data access layer to update product
message = "Product updated successfully";
return true;
*/
return productDAO.UpdateProduct(product, ref message);
}
}
public ProductBDO GetProduct(int id)
{
/*
// TODO: connect to DB to retrieve product
ProductBDO p = new ProductBDO();
p.ProductID = id;
p.ProductName =
"fake product name from data access layer";
p.UnitPrice = 30.00m;
p.QuantityPerUnit = "fake QPU";
return p;
*/
ProductBDO p = null;
using (SqlConnection conn =
new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand())
{
cmd.CommandText =
"select * from Products where ProductID=@id";
cmd.Parameters.AddWithValue("@id", id);
cmd.Connection = conn;
conn.Open();
using (SqlDataReader reader = cmd.ExecuteReader())
{
if (reader.HasRows)
{
reader.Read();
p = new ProductBDO();
p.ProductID = id;
p.ProductName =
(string)reader["ProductName"];
p.QuantityPerUnit =
(string)reader["QuantityPerUnit"];
p.UnitPrice =
(decimal)reader["UnitPrice"];
p.UnitsInStock =
(short)reader["UnitsInStock"];
p.UnitsOnOrder =
(short)reader["UnitsOnOrder"];
p.ReorderLevel =
(short)reader["ReorderLevel"];
p.Discontinued =
(bool)reader["Discontinued"];
}
}
}
}
return p;
}
public bool UpdateProduct(ProductBDO product, ref string message)
{
/*
// TODO: connect to DB to update product
message = "product updated successfully";
return true;
*/
message = "product updated successfully";
bool ret = true;
using (SqlConnection conn =
new SqlConnection(connectionString))
{
string cmdStr = @"UPDATE products
SET ProductName=@name,
QuantityPerUnit=@unit,
UnitPrice=@price,
Discontinued=@discontinued
WHERE ProductID=@id";
using (SqlCommand cmd = new SqlCommand(cmdStr, conn))
{
cmd.Parameters.AddWithValue("@name",
product.ProductName);
cmd.Parameters.AddWithValue("@unit",
product.QuantityPerUnit);
cmd.Parameters.AddWithValue("@price",
product.UnitPrice);
cmd.Parameters.AddWithValue("@discontinued",
product.Discontinued);
cmd.Parameters.AddWithValue("@id",
product.ProductID);
conn.Open();
if (cmd.ExecuteNonQuery() != 1)
{
message = "no product is updated";
ret = false;
}
}
}
return ret;
}
public bool UpdateProduct(Product product,
ref string message)
{
bool result = true;
// first check to see if it is a valid price
if (product.UnitPrice <= 0)
{
message = "Price cannot be <= 0";
result = false;
}
// ProductName can't be empty
else if (string.IsNullOrEmpty(product.ProductName))
{
message = "Product name cannot be empty";
result = false;
}
// QuantityPerUnit can't be empty
else if (string.IsNullOrEmpty(product.QuantityPerUnit))
{
message = "Quantity cannot be empty";
result = false;
}
else
{
ProductBDO productBDO = new ProductBDO();
TranslateProductDTOToProductBDO(product, productBDO);
try
{
result = productLogic.UpdateProduct(
productBDO, ref message);
}
catch (Exception e)
{
string msg = e.Message;
string reason = "UpdateProduct Exception";
throw new FaultException<ProductFault>
(new ProductFault(msg), reason);
}
}
return result;
}
private void TranslateProductDTOToProductBDO(
Product product,
ProductBDO productBDO)
{
productBDO.ProductID = product.ProductID;
productBDO.ProductName = product.ProductName;
productBDO.QuantityPerUnit = product.QuantityPerUnit;
productBDO.UnitPrice = product.UnitPrice;
productBDO.Discontinued = product.Discontinued;
}