public static int AddProductSupplier(ProductSupplier prodsup)
{
SqlConnection con = TravelExpertsDB.GetConnection();
string insertStatement = "INSERT INTO Products_Suppliers (ProductSupplierID, ProductID, SupplierID) " +
"VALUES(@ProductSupplierID, @ProductID, @SupplierID)";
SqlCommand cmd = new SqlCommand(insertStatement, con);
cmd.Parameters.AddWithValue("@ProductSupplierID", prodsup.ProductSupplierID);
cmd.Parameters.AddWithValue("@ProductID", prodsup.ProductID);
cmd.Parameters.AddWithValue("@SupplierID", prodsup.SupplierID);
try
{
con.Open();
cmd.ExecuteNonQuery(); // run the insert command
// get the generated ID - current identity value for Products_Suppliers table
string selectQuery = "SELECT IDENT_CURRENT('ProductSuppliers') FROM Products_Suppliers";
SqlCommand selectCmd = new SqlCommand(selectQuery, con);
int productsupplierID = Convert.ToInt32(selectCmd.ExecuteScalar()); // single value
// typecase (int) does NOT work!
return productsupplierID;
}
catch (SqlException ex)
{
throw ex;
}
finally
{
con.Close();
}
}
/// <summary>
/// <author>Brian Appleton</author>
/// Gets a product supplier from a product id and supplier id
/// </summary>
/// <returns></returns>
public static ProductSupplier GetProductSupplier(int productId, int supplierId)
{
ProductSupplier productSupplier = null;
SqlConnection con = TravelExpertsConnection.GetConnection();
string selectStatement = "SELECT ProductSupplierID, ProductID, SupplierID " +
"FROM Products_Suppliers " +
"WHERE ProductID = @ProductID AND " +
"SupplierID = @SupplierID";
using (SqlCommand cmd = new SqlCommand(selectStatement, con))
{
cmd.Parameters.AddWithValue("@ProductID", productId);
cmd.Parameters.AddWithValue("@SupplierID", supplierId);
con.Open();
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.SingleRow);
if (reader.Read()) // found a customer
{
productSupplier = new ProductSupplier
{
ProductSupplierID = (int)reader["ProductSupplierID"],
ProductID = (int)reader["ProductID"],
SupplierID = (int)reader["SupplierID"]
};
}
con.Close();
}
return(productSupplier);
}
public static ProductSupplier GetProductSupplier(int productsupplierID)
{
ProductSupplier prodsup = null;
SqlConnection con = TravelExpertsDB.GetConnection();
string selectStatement = "SELECT ProductSupplierID, ProductID, SupplierID " +
"FROM Products_Suppliers " +
"WHERE ProductSupplierID = @ProductSupplierID";
SqlCommand cmd = new SqlCommand(selectStatement, con);
cmd.Parameters.AddWithValue("@ProductSupplierID", productsupplierID); // value comes from the method's argument
try
{
con.Open();
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.SingleRow);
if (reader.Read()) // found a customer
{
prodsup = new ProductSupplier();
prodsup.ProductSupplierID = (int)reader["ProductSupplierID"];
prodsup.ProductID = (int)reader["ProductID"];
prodsup.SupplierID = (int)reader["SupplierID"];
}
}
catch (SqlException ex)
{
throw ex;
}
finally
{
con.Close();
}
return prodsup;
}
public static List<ProductSupplier> GetAllProductSuppliers()
{
List<ProductSupplier> productsuppliers = new List<ProductSupplier>();
ProductSupplier prodsup = null;
SqlConnection con = TravelExpertsDB.GetConnection();
string selectStatement = "SELECT ProductSupplierID, ProductID, SupplierID " +
"FROM Products_Suppliers " +
"ORDER BY ProductSupplierID";
SqlCommand cmd = new SqlCommand(selectStatement, con);
try
{
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read()) // while there are customers
{
prodsup = new ProductSupplier();
prodsup.ProductSupplierID = (int)reader["ProductSupplierID"];
prodsup.ProductID = (int)reader["ProductID"];
prodsup.SupplierID = (int)reader["SupplierID"];
productsuppliers.Add(prodsup);
}
}
catch (SqlException ex)
{
throw ex;
}
finally
{
con.Close();
}
return productsuppliers;
}
public static bool UpdateSupplier(ProductSupplier oldProdSup, ProductSupplier newProdSup)
{
SqlConnection con = TravelExpertsDB.GetConnection();
string updateStatement = "UPDATE Products_Suppliers " +
"SET ProductSupplierID = @NewProductSupplierID, " +
" ProductID = @NewProductID, " +
" SupplierID = @NewSupplierID " +
"WHERE ProductSupplierID = @OldProductSupplierID " +
"AND ProductID = @OldProductID " +
"AND SupplierID = @OldSupplierID ";
SqlCommand cmd = new SqlCommand(updateStatement, con);
cmd.Parameters.AddWithValue("@NewProductSupplierID", newProdSup.ProductSupplierID);
cmd.Parameters.AddWithValue("@NewProductID", newProdSup.ProductID);
cmd.Parameters.AddWithValue("@NewSupplierID", newProdSup.SupplierID);
cmd.Parameters.AddWithValue("@OldProductSupplierID", oldProdSup.ProductSupplierID);
cmd.Parameters.AddWithValue("@OldProductID", oldProdSup.ProductID);
cmd.Parameters.AddWithValue("@OldSupplierID", oldProdSup.SupplierID);
try
{
con.Open();
int count = cmd.ExecuteNonQuery();
if (count > 0) return true;
else return false;
}
catch (SqlException ex)
{
throw ex;
}
finally
{
con.Close();
}
}
public static bool DeleteProductSupplier(ProductSupplier prodsup)
{
SqlConnection con = TravelExpertsDB.GetConnection();
string deleteStatement = "DELETE FROM Products_Suppliers " +
"WHERE ProductSupplierID = @ProductSupplierID " + // to identify the supplier to be deleted
"AND ProductID = @ProductID " +
"AND SupplierID = @SupplierID "; // remaining conditions - to ensure optimistic concurrency
SqlCommand cmd = new SqlCommand(deleteStatement, con);
cmd.Parameters.AddWithValue("@ProductSupplierID", prodsup.ProductSupplierID);
cmd.Parameters.AddWithValue("@ProductID", prodsup.ProductID);
cmd.Parameters.AddWithValue("@SupplierID", prodsup.SupplierID);
try
{
con.Open();
int count = cmd.ExecuteNonQuery();
if (count > 0) return true;
else return false;
}
catch (SqlException ex)
{
throw ex;
}
finally
{
con.Close();
}
}
public static List<ProductSupplier> GetAllProductSuppliers()
{
List<ProductSupplier> productsuppliers = new List<ProductSupplier>();
ProductSupplier prodsup = null;
