// retrieve all objects
public static List <TripTypes> GetAll()
{
// create SELECT command
string query =
"SELECT TripTypeId, TTName " +
"FROM TripTypes ";
SqlConnection connection = TravelExperts.GetConection();
List <TripTypes> dataList = new List <TripTypes>(); // epmty list
TripTypes data; // for reading
// create connection
SqlCommand cmd = new SqlCommand(query, connection);
// open the conection
connection.Open();
// run the command
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
// build object list to return
while (reader.Read()) // if there is a object with this ID
{
data = new TripTypes();
data.TripTypeId = reader["TripTypeId"].ToString();
data.TTName = reader["TTName"].ToString();
dataList.Add(data);
}
return(dataList);
}
// retrieve all objects
public static List <Products> GetAll()
{
// create SELECT command
string query =
"SELECT ProductID, ProdName " +
"FROM Products ";
SqlConnection connection = TravelExperts.GetConection();
List <Products> dataList = new List <Products>(); // epmty list
Products data; // for reading
// create connection
SqlCommand cmd = new SqlCommand(query, connection);
// open the conection
connection.Open();
// run the command
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
// build object list to return
while (reader.Read()) // if there is a object with this ID
{
data = new Products();
data.ProductID = Convert.ToInt32(reader["ProductID"]);
data.ProdName = reader["ProdName"].ToString();
dataList.Add(data);
}
return(dataList);
}
// Update object
// return indicator of success
public static bool Update(Products oldObj, Products newObj)
{
bool success = false; // did not update
// create connection
SqlConnection connection = TravelExperts.GetConection();
// create UPDATE command
string updateStatment =
"UPDATE Products SET " +
"ProductID = @NewProductID, " +
"ProdName = @NewProdName " +
"WHERE ProductID = @OldProductID " + // identifies
"AND ProdName = @OldProdName "; // the rest - for optimistic concurrency;
SqlCommand cmd = new SqlCommand(updateStatment, connection);
// suply perameter value
// New object Values
cmd.Parameters.AddWithValue("@NewProductID", newObj.ProductID);
cmd.Parameters.AddWithValue("@NewProdName", newObj.ProdName);
// ID
cmd.Parameters.AddWithValue("@OldProductID", oldObj.ProductID);
// Old object Values
cmd.Parameters.AddWithValue("@OldProdName", oldObj.ProdName);
// execute the UPDATE command
try
{
// open the conection
connection.Open();
// execute the command
int count = cmd.ExecuteNonQuery();
// check if successful
if (count > 0)
{
success = true; // updated
}
}
catch (Exception ex)
{
throw ex;
}
finally // executes always
{
connection.Close();
}
// retrieve generated object ID to return
return(success);
}
// retrieve object with given ID
public static Products GetValue(int objID)
{
Products obj = null;
// create connection
SqlConnection connection = TravelExperts.GetConection();
// create SELECT command
string query =
"SELECT ProductID, ProdName " +
"FROM Products " +
"WHERE ProductID = @ProductID ";
SqlCommand cmd = new SqlCommand(query, connection);
// suply perameter value
cmd.Parameters.AddWithValue("@ProductID", objID);
// run the SELECT query
try
{
// open the conection
connection.Open();
// run the command
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.SingleRow);
// build object object to return
if (reader.Read()) // if there is a object with this ID
{
obj = new Products();
obj.ProductID = Convert.ToInt32(reader["ProductID"]);
obj.ProdName = reader["ProdName"].ToString();
}
reader.Close();
}
catch (Exception ex)
{
throw ex;
}
finally // executes always
{
connection.Close();
}
return(obj);
}
// retrieve object with given ID
public static TripTypes GetValue(int objID)
{
TripTypes obj = null;
// create connection
SqlConnection connection = TravelExperts.GetConection();
// create SELECT command
string query =
"SELECT TripTypeId, TTName " +
"FROM TripTypes " +
"WHERE TripTypeId = @TripTypeId ";
SqlCommand cmd = new SqlCommand(query, connection);
// suply perameter value
cmd.Parameters.AddWithValue("@TripTypeId", objID);
// run the SELECT query
try
{
// open the conection
connection.Open();
// run the command
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.SingleRow);
// build object object to return
if (reader.Read()) // if there is a object with this ID
{
obj = new TripTypes();
obj.TripTypeId = reader["TripTypeId"].ToString();
obj.TTName = reader["TTName"].ToString();
}
reader.Close();
}
catch (Exception ex)
{
throw ex;
}
finally // executes always
{
connection.Close();
}
return(obj);
}
// Delete object
// return indicator of success
public static bool Delete(Products obj)
{
bool success = false;
// create connection
SqlConnection connection = TravelExperts.GetConection();
// create DELETE command
string deleteStatment =
"DELETE FROM Products " +
"WHERE ProductID = @ProductID " + // needed for identification of object
"AND ProdName = @ProdName "; // the rest - for optimistic concurrency
SqlCommand cmd = new SqlCommand(deleteStatment, connection);
// suply perameter value
cmd.Parameters.AddWithValue("@ProductID", obj.ProductID);
cmd.Parameters.AddWithValue("@ProdName", obj.ProdName);
// execute the command
try
{
// open the conection
connection.Open();
// execute the command
int count = cmd.ExecuteNonQuery();
// check if successful
if (count > 0)
{
success = true;
}
}
catch (Exception ex)
{
throw ex;
}
finally // executes always
{
connection.Close();
}
// retrieve generated customer nID to return
return(success);
}
// insert new row to table
// return new object
public static int Add(Products obj)
{
int objID = 0;
// create connection
SqlConnection connection = TravelExperts.GetConection();
// create INSERT command
// CustomerID is IDENTITY so no value provided
string insertStatment =
"INSERT INTO Products(ProductID, ProdName) " +
"OUTPUT inserted.[ProductID] " +
"VALUES(@ProductID, @ProdName) ";
SqlCommand cmd = new SqlCommand(insertStatment, connection);
// suply perameter value
cmd.Parameters.AddWithValue("@ProductID", obj.ProductID);
cmd.Parameters.AddWithValue("@ProdName", obj.ProdName);
// execute the INSERT command
try
{
// open the conection
connection.Open();
// execute insert command
objID = (int)cmd.ExecuteScalar();
}
catch (Exception ex)
{
throw ex;
}
finally // executes always
{
connection.Close();
}
// retrieve generated customer nID to return
return(objID);
}