public static bool DeleteCustomer(Customer customer)
{
SqlConnection connection = MMADB.GetConnection();
string deleteStatement =
"DELETE FROM Customers " +
"WHERE Name = @Name " +
"AND Address = @Address " +
"AND City = @City " +
"AND State = @State " +
"AND ZipCode = @ZipCode";
SqlCommand deleteCommand =
new SqlCommand(deleteStatement, connection);
deleteCommand.Parameters.AddWithValue(
"@Name", customer.Name);
deleteCommand.Parameters.AddWithValue(
"@Address", customer.Address);
deleteCommand.Parameters.AddWithValue(
"@City", customer.City);
deleteCommand.Parameters.AddWithValue(
"@State", customer.State);
deleteCommand.Parameters.AddWithValue(
"@ZipCode", customer.ZipCode);
try
{
connection.Open();
int count = deleteCommand.ExecuteNonQuery();
if (count > 0)
{
return(true);
}
else
{
return(false);
}
}
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close();
}
}
public static Customer GetCustomer(int customerID)
{
SqlConnection connection = MMADB.GetConnection();
string selectStatement
= "SELECT CustomerID, Name, Address, City, State, ZipCode "
+ "FROM Customers "
+ "WHERE CustomerID = @CustomerID";
SqlCommand selectCommand =
new SqlCommand(selectStatement, connection);
selectCommand.Parameters.AddWithValue("@CustomerID", customerID);
try
{
connection.Open();
SqlDataReader custReader =
selectCommand.ExecuteReader(CommandBehavior.SingleRow);
if (custReader.Read())
{
Customer customer = new Customer();
customer.CustomerID = (int)custReader["CustomerID"];
customer.Name = custReader["Name"].ToString();
customer.Address = custReader["Address"].ToString();
customer.City = custReader["City"].ToString();
customer.State = custReader["State"].ToString();
customer.ZipCode = custReader["ZipCode"].ToString();
return(customer);
}
else
{
return(null);
}
}
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close();
}
}
public static int AddCustomer(Customer customer)
{
SqlConnection connection = MMADB.GetConnection();
string insertStatement =
"INSERT Customers " +
"(Name, Address, City, State, ZipCode) " +
"VALUES (@Name, @Address, @City, @State, @ZipCode)";
SqlCommand insertCommand =
new SqlCommand(insertStatement, connection);
insertCommand.Parameters.AddWithValue(
"@Name", customer.Name);
insertCommand.Parameters.AddWithValue(
"@Address", customer.Address);
insertCommand.Parameters.AddWithValue(
"@City", customer.City);
insertCommand.Parameters.AddWithValue(
"@State", customer.State);
insertCommand.Parameters.AddWithValue(
"@ZipCode", customer.ZipCode);
try
{
connection.Open();
insertCommand.ExecuteNonQuery();
string selectStatement =
"SELECT IDENT_CURRENT('Customers') FROM Customers";
SqlCommand selectCommand =
new SqlCommand(selectStatement, connection);
int customerID = Convert.ToInt32(selectCommand.ExecuteScalar());
return(customerID);
}
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close();
}
}
public static bool UpdateCustomer(Customer oldCustomer,
Customer newCustomer)
{
SqlConnection connection = MMADB.GetConnection();
string updateStatement =
"UPDATE Customers SET " +
"Name = @NewName, " +
"Address = @NewAddress, " +
"City = @NewCity, " +
"State = @NewState, " +
"ZipCode = @NewZipCode " +
"WHERE Name = @OldName " +
"AND Address = @OldAddress " +
"AND City = @OldCity " +
"AND State = @OldState " +
"AND ZipCode = @OldZipCode";
SqlCommand updateCommand =
new SqlCommand(updateStatement, connection);
updateCommand.Parameters.AddWithValue(
"@NewName", newCustomer.Name);
updateCommand.Parameters.AddWithValue(
"@NewAddress", newCustomer.Address);
updateCommand.Parameters.AddWithValue(
"@NewCity", newCustomer.City);
updateCommand.Parameters.AddWithValue(
"@NewState", newCustomer.State);
updateCommand.Parameters.AddWithValue(
"@NewZipCode", newCustomer.ZipCode);
updateCommand.Parameters.AddWithValue(
"@OldName", oldCustomer.Name);
updateCommand.Parameters.AddWithValue(
"@OldAddress", oldCustomer.Address);
updateCommand.Parameters.AddWithValue(
"@OldCity", oldCustomer.City);
updateCommand.Parameters.AddWithValue(
"@OldState", oldCustomer.State);
updateCommand.Parameters.AddWithValue(
"@OldZipCode", oldCustomer.ZipCode);
try
{
connection.Open();
int count = updateCommand.ExecuteNonQuery();
if (count > 0)
{
return(true);
}
else
{
return(false);
}
}
catch (SqlException ex)
{
throw ex;
}
finally
{
connection.Close();
}
}
