/// <summary>
/// Angelito: Updates package info
/// </summary>
/// <param name="oldPkg">old package info</param>
/// <param name="newPkg">new package info</param>
/// <returns>success indicator</returns>
public static bool UpdatePackage(Package oldPkg, Package newPkg)
{
// added consideration for Null values -Katrina
bool result = false; // no success yet
using (SqlConnection connection = TravelExpertsDB.GetConnection())
{
string updateStatement = "UPDATE Packages SET " +
"PkgName = @NewPkgName, " +
"PkgStartDate = @NewPkgStartDate, " +
"PkgEndDate = @NewPkgEndDate, " +
"PkgDesc = @NewPkgDesc, " +
"PkgBasePrice = @NewPkgBasePrice, " +
"PkgAgencyCommission = @NewPkgAgencyCommission " +
"WHERE PackageId = @OldPackageId " + // identifies package
"AND PkgName = @OldPkgName " +
// PkgStartDate Null option -Katrina
"AND (PkgStartDate = @OldPkgStartDate " +
"OR PkgStartDate IS NULL " +
"AND @OldPkgStartDate IS NULL) " +
// PkgEndDate Null option -Katrina
"AND (PkgEndDate = @OldPkgEndDate " +
"OR PkgEndDate IS NULL " +
"AND @OldPkgEndDate IS NULL) " +
// PkgDesc Null option -Katrina
"AND (PkgDesc = @OldPkgDesc " +
"OR PkgDesc IS NULL " +
"AND @OldPkgDesc IS NULL) " +
"AND PkgBasePrice = @OldPkgBasePrice " +
// PkgAgencyCommission Null option -Katrina
"AND (PkgAgencyCommission = @OldPkgAgencyCommission " +
"OR PkgAgencyCommission IS NULL " +
"AND @OldPkgAgencyCommission IS NULL)";
using (SqlCommand cmd = new SqlCommand(updateStatement, connection))
{
// added consideration for Null values -Katrina
cmd.Parameters.AddWithValue("@NewPkgName", newPkg.PkgName);
if (newPkg.PkgStartDate == null) // if new PkgStartDate is null
{
cmd.Parameters.AddWithValue("@NewPkgStartDate", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@NewPkgStartDate", (DateTime)newPkg.PkgStartDate);
}
if (newPkg.PkgEndDate == null) // if new PkgEndDate is null
{
cmd.Parameters.AddWithValue("@NewPkgEndDate", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@NewPkgEndDate", (DateTime)newPkg.PkgEndDate);
}
// PkgDesc and PkgBasePrice can't be null when modifying
cmd.Parameters.AddWithValue("@NewPkgDesc", newPkg.PkgDesc);
cmd.Parameters.AddWithValue("@NewPkgBasePrice", newPkg.PkgBasePrice);
if (newPkg.PkgAgencyCommission == null) // if new PkgAgencyCommission is null
{
cmd.Parameters.AddWithValue("@NewPkgAgencyCommission", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@NewPkgAgencyCommission", (decimal)newPkg.PkgAgencyCommission);
}
cmd.Parameters.AddWithValue("@OldPackageId", oldPkg.PackageId);
cmd.Parameters.AddWithValue("@OldPkgName", oldPkg.PkgName);
if (oldPkg.PkgStartDate == null) // if old PkgStartDate is null
{
cmd.Parameters.AddWithValue("@OldPkgStartDate", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@OldPkgStartDate", (DateTime)oldPkg.PkgStartDate);
}
if (oldPkg.PkgEndDate == null) // if old PkgEndDate is null
{
cmd.Parameters.AddWithValue("@OldPkgEndDate", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@OldPkgEndDate", (DateTime)oldPkg.PkgEndDate);
}
if (oldPkg.PkgDesc == null) // if old PkgDesc is null
{
cmd.Parameters.AddWithValue("@OldPkgDesc", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@OldPkgDesc", (string)oldPkg.PkgDesc);
}
cmd.Parameters.AddWithValue("@OldPkgBasePrice", oldPkg.PkgBasePrice);
if (oldPkg.PkgAgencyCommission == null) // if old PkgAgencyCommission is null
{
cmd.Parameters.AddWithValue("@OldPkgAgencyCommission", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@OldPkgAgencyCommission", (decimal)oldPkg.PkgAgencyCommission);
}
// open connection
connection.Open();
// execute UPDATE command
int count = cmd.ExecuteNonQuery();
if (count > 0) // if row(s) affected
{
result = true;
}
}
}
return(result);
}
/// <summary>
/// Katrina Spencer: Retrieves product-supplier info with given id
/// </summary>
/// <param name="prodSupId">id of product-supplier to get</param>
/// <returns>product-supplier object</returns>
public static ProductSupplier GetProductSupplier(int prodSupId)
{
ProductSupplier prodSup = null;
// connection
using (SqlConnection connection = TravelExpertsDB.GetConnection())
{
string query = "SELECT ProductSupplierId, ps.ProductId, ProdName, ps.SupplierId, SupName " +
"FROM Products_Suppliers AS ps " +
"JOIN Products ON ps.ProductId = Products.ProductId " +
"JOIN Suppliers ON ps.SupplierId = Suppliers.SupplierId " +
"WHERE ProductSupplierId = @ProductSupplierId";
using (SqlCommand cmd = new SqlCommand(query, connection))
{
cmd.Parameters.AddWithValue("@ProductSupplierId", prodSupId);
// run command and process data
connection.Open();
using (SqlDataReader dr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection))
{
if (dr.Read()) // if data
{
prodSup = new ProductSupplier();
prodSup.ProductSupplierId = (int)dr["ProductSupplierId"];
// determine if it is DBNull and set
int colProd = dr.GetOrdinal("ProductId"); // column number of ProductId
if (dr.IsDBNull(colProd)) // if reader contains DBNull in this column
{
prodSup.ProductId = null; // make null in the object
}
else // if not null
{
prodSup.ProductId = (int)(dr["ProductId"]);
}
int colSup = dr.GetOrdinal("SupplierId"); // column number of SupplierId
if (dr.IsDBNull(colSup)) // if reader contains DBNull in this column
{
prodSup.SupplierId = null; // make null in the object
}
else // if not null
{
prodSup.SupplierId = (int)(dr["SupplierId"]);
}
int colProdName = dr.GetOrdinal("ProdName"); // column number of ProdName
if (dr.IsDBNull(colProdName)) // if reader contains DBNull in this column
{
prodSup.ProdName = null; // make null in the object
}
else // if not null
{
prodSup.ProdName = (string)(dr["ProdName"]);
}
int colSupName = dr.GetOrdinal("SupName"); // column number of SupName
if (dr.IsDBNull(colSupName)) // if reader contains DBNull in this column
{
prodSup.SupName = null; // make null in the object
}
else // if not null
{
prodSup.SupName = (string)(dr["SupName"]);
}
}
}
}
}
return(prodSup);
}
/// <summary>
/// Angelito: Adds a new package
/// </summary>
/// <param name="pkg">new package info</param>
/// <returns>new package id</returns>
public static int AddPackage(Package pkg)
{
int pkgId = 0;
using (SqlConnection connection = TravelExpertsDB.GetConnection())
{
string insertStatement =
"INSERT INTO Packages (PkgName, PkgStartDate, PkgEndDate, PkgDesc, PkgBasePrice, PkgAgencyCommission) " +
"OUTPUT INSERTED.PackageId " +
"VALUES(@PkgName, @PkgStartDate, @PkgEndDate, @PkgDesc, @PkgBasePrice, @PkgAgencyCommission)";
using (SqlCommand cmd = new SqlCommand(insertStatement, connection))
{
// Added consideration for Null values -Katrina
cmd.Parameters.AddWithValue("@PkgName", pkg.PkgName);
Console.WriteLine("Package name in databse to be inserted " + pkg.PkgName);
if (pkg.PkgStartDate == null)
{
cmd.Parameters.AddWithValue("@PkgStartDate", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@PkgStartDate", (DateTime)pkg.PkgStartDate);
}
if (pkg.PkgEndDate == null)
{
cmd.Parameters.AddWithValue("@PkgEndDate", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@PkgEndDate", (DateTime)pkg.PkgEndDate);
}
if (pkg.PkgDesc == null)
{
cmd.Parameters.AddWithValue("@PkgDesc", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@PkgDesc", (string)pkg.PkgDesc);
}
cmd.Parameters.AddWithValue("@PkgBasePrice", pkg.PkgBasePrice);
if (pkg.PkgAgencyCommission == null)
{
cmd.Parameters.AddWithValue("@PkgAgencyCommission", DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@PkgAgencyCommission", (decimal)pkg.PkgAgencyCommission);
}
// open connection
connection.Open();
pkgId = (int)cmd.ExecuteScalar(); // returns one value
}
}
return(pkgId);
}
/// <summary>
/// Katrina Spencer: Updates product-supplier info
/// </summary>
/// <param name="oldProdSup">old product-supplier info</param>
/// <param name="newProdSup">new product-supplier info</param>
/// <returns>success indicator</returns>
public static bool UpdateProductSupplier(ProductSupplier oldProdSup, ProductSupplier newProdSup)
{
bool result = false; // no success yet
using (SqlConnection connection = TravelExpertsDB.GetConnection())
{
string updateStatement = "UPDATE Products_Suppliers " +
"SET ProductId = @NewProductId, " +
"SupplierId = @NewSupplierId " +
"WHERE ProductSupplierId = @OldProductSupplierId " + // identifies product-supplier
"AND (ProductId = @OldProductId " +
"OR ProductId IS NULL " +
"AND @OldProductId IS NULL) " +
"AND (SupplierId = @OldSupplierId " +
"OR SupplierId IS NULL " +
"AND @OldSupplierId IS NULL)";
using (SqlCommand cmd = new SqlCommand(updateStatement, connection))
{
if (newProdSup.ProductId == null) // if new ProductId is null
{
cmd.Parameters.AddWithValue("@NewProductId", DBNull.Value); // set DBNull
}
else
{
cmd.Parameters.AddWithValue("@NewProductId", (int)newProdSup.ProductId);
}
if (newProdSup.SupplierId == null) // if new SupplierId is null
{
cmd.Parameters.AddWithValue("@NewSupplierId", DBNull.Value); // set DBNull
}
else
{
cmd.Parameters.AddWithValue("@NewSupplierId", (int)newProdSup.SupplierId);
}
cmd.Parameters.AddWithValue("@OldProductSupplierId", oldProdSup.ProductSupplierId);
if (oldProdSup.ProductId == null) // if old ProductId is null
{
cmd.Parameters.AddWithValue("@OldProductId", DBNull.Value); // set DBNull
}
else
{
cmd.Parameters.AddWithValue("@OldProductId", (int)oldProdSup.ProductId);
}
if (oldProdSup.SupplierId == null) // if old SupplierId is null
{
cmd.Parameters.AddWithValue("@OldSupplierId", DBNull.Value); // set DBNull
}
else
{
cmd.Parameters.AddWithValue("@OldSupplierId", (int)oldProdSup.SupplierId);
}
// open connection
connection.Open();
// execute UPDATE command
int count = cmd.ExecuteNonQuery();
if (count > 0) // if row(s) affected
{
result = true;
}
}
}
return(result);
}