// Ham Update balance Transfer
public bool UpdateBalanceTransfer(Account account, Transaction historyTransaction)
{
DbConnection.Instance().OpenConnection();
var transaction = DbConnection.Instance().Connection.BeginTransaction();
try
{
// 1.thực hiện trừ số tiền người chuyển.
//1.1 Lấy thông tin số dư người chuyển.
var queryBalanceUser = "******";
MySqlCommand queryBalanceCommand =
new MySqlCommand(queryBalanceUser, DbConnection.Instance().Connection);
queryBalanceCommand.Parameters.AddWithValue("@username", account.Username);
queryBalanceCommand.Parameters.AddWithValue("@status", account.Status);
var balanceReader = queryBalanceCommand.ExecuteReader();
if (!balanceReader.Read())
{
throw new BankError("Invalid username");
}
// dam bao luon co ban ghi
var currentBalance = balanceReader.GetDecimal("balance");
balanceReader.Close();
// kiểm tra số dư tài khoản có đủ thực hiện giao dịch k
if (historyTransaction.Type == Transaction.TransactionType.TRANSFER &&
historyTransaction.Amount > currentBalance)
{
throw new BankError("Số dư không đủ!");
}
// trừ tiền người gửi.
if (historyTransaction.Type == Transaction.TransactionType.TRANSFER)
{
currentBalance = currentBalance - historyTransaction.Amount;
}
// update so du vao vao tai khoan người chuyển.
var updateAccountResult = 0;
var queryUpdateAccountBalance =
"update `account` set balance = @balance where username = @username and status = 1";
var cmdUpdateAccountBalance =
new MySqlCommand(queryUpdateAccountBalance, DbConnection.Instance().Connection);
cmdUpdateAccountBalance.Parameters.AddWithValue("@username", account.Username);
cmdUpdateAccountBalance.Parameters.AddWithValue("@balance", currentBalance);
updateAccountResult = cmdUpdateAccountBalance.ExecuteNonQuery();
// 2. thực hiện cộng tiền cho người nhận
// 2.1 lấy thông tin so dư mới nhất của người nhận.
var queryBalanceAccountReceiver =
"select balance from `account` where username = @username and status = @status";
MySqlCommand queryBalanceCommandAccount =
new MySqlCommand(queryBalanceAccountReceiver, DbConnection.Instance().Connection);
queryBalanceCommandAccount.Parameters.AddWithValue("@username", Program.curentAccountReceiver.Username);
queryBalanceCommandAccount.Parameters.AddWithValue("@status", Program.curentAccountReceiver.Status);
var balanceReaderAccountReceiver = queryBalanceCommandAccount.ExecuteReader();
if (!balanceReaderAccountReceiver.Read())
{
throw new BankError("Invalid username");
}
// dam bao luon co ban ghi
var currentBalanceAccountReceiver = balanceReaderAccountReceiver.GetDecimal("balance");
balanceReaderAccountReceiver.Close();
// Cộng tiền người nhận.
if (historyTransaction.Type == Transaction.TransactionType.TRANSFER)
{
currentBalanceAccountReceiver = currentBalanceAccountReceiver + historyTransaction.Amount;
}
// update so du moi nhat cua nguoi nhận vào database
var updateAccountNumber = 0;
var queryUpdateBalanceReceiver =
"update `account` set balance = @balance where username = @username and status = 1";
var cmdUpdateAccountBalanceReceiver =
new MySqlCommand(queryUpdateBalanceReceiver, DbConnection.Instance().Connection);
cmdUpdateAccountBalanceReceiver.Parameters.AddWithValue("@username", Program.curentAccountReceiver.Username);
cmdUpdateAccountBalanceReceiver.Parameters.AddWithValue("@balance", currentBalanceAccountReceiver);
updateAccountNumber = cmdUpdateAccountBalanceReceiver.ExecuteNonQuery();
// luu thong tin transaction
var insertTransactionResult = 0;
var queryInsertTransaction = "insert into `transaction` " +
"(id, type, amount, content, senderAccountNumber, receiverAccountNumber, status) " +
"values (@id, @type, @amount, @content, @senderAccountNumber, @receiverAccountNumber, @status)";
var cmdInsertTransaction =
new MySqlCommand(queryInsertTransaction, DbConnection.Instance().Connection);
cmdInsertTransaction.Parameters.AddWithValue("@id", historyTransaction.Id);
cmdInsertTransaction.Parameters.AddWithValue("@type", historyTransaction.Type);
cmdInsertTransaction.Parameters.AddWithValue("@amount", historyTransaction.Amount);
cmdInsertTransaction.Parameters.AddWithValue("@content", historyTransaction.Content);
cmdInsertTransaction.Parameters.AddWithValue("@senderAccountNumber",
historyTransaction.SenderAccountNumber);
cmdInsertTransaction.Parameters.AddWithValue("@receiverAccountNumber",
historyTransaction.ReceiverAccountNumber);
cmdInsertTransaction.Parameters.AddWithValue("@status", historyTransaction.Status);
insertTransactionResult = cmdInsertTransaction.ExecuteNonQuery();
if (updateAccountResult == 1 && insertTransactionResult == 1 && updateAccountNumber == 1)
{
transaction.Commit();
return(true);
}
}
catch (BankError e)
{
transaction.Rollback();
return(false);
}
DbConnection.Instance().CloseConnection();
return(false);
}
public bool UpdateBalance(Account account, Transaction historyTransaction)
{
DbConnection.Instance().OpenConnection();
// tao transaction
var transaction = DbConnection.Instance().Connection.BeginTransaction();
try
{
// Lay thong tin so du
var queryBalance = "select balance from `account` where username = @username and status = @status";
MySqlCommand queryBalanceCommand = new MySqlCommand(queryBalance, DbConnection.Instance().Connection);
queryBalanceCommand.Parameters.AddWithValue("@username", account.Username);
queryBalanceCommand.Parameters.AddWithValue("@status", account.Status);
var balanceReader = queryBalanceCommand.ExecuteReader();
// thow loi neu k ton tai ban ghi
if (!balanceReader.Read())
{
throw new BankError("Invalid username");
}
// dam bao luon co ban ghi
var currentBalance = balanceReader.GetDecimal("balance");
balanceReader.Close();
//kiem tra kieu transaction chi chap nhan withdraw va deposit
if (historyTransaction.Type != Transaction.TransactionType.DEPOSIT &&
historyTransaction.Type != Transaction.TransactionType.WITHDRAW)
{
throw new BankError("Số dư không đủ");
}
if (historyTransaction.Type == Transaction.TransactionType.WITHDRAW &&
historyTransaction.Amount > currentBalance)
{
throw new BankError("Số dư không đủ!");
}
// cong tien vao tai khoan
if (historyTransaction.Type != Transaction.TransactionType.DEPOSIT)
{
currentBalance -= historyTransaction.Amount;
}
else
{
currentBalance += historyTransaction.Amount;
}
// update so du vao database
var updateAccountResult = 0;
var queryUpdateAccountBalance =
"update `account` set balance = @balance where username = @username and status = 1";
var cmdUpdateAccountBalance =
new MySqlCommand(queryUpdateAccountBalance, DbConnection.Instance().Connection);
cmdUpdateAccountBalance.Parameters.AddWithValue("@username", account.Username);
cmdUpdateAccountBalance.Parameters.AddWithValue("@balance", currentBalance);
updateAccountResult = cmdUpdateAccountBalance.ExecuteNonQuery();
// luu thong tin transaction
var insertTransactionResult = 0;
var queryInsertTransaction = "insert into `transaction` " +
"(id, type, amount, content, senderAccountNumber, receiverAccountNumber, status) " +
"values (@id, @type, @amount, @content, @senderAccountNumber, @receiverAccountNumber, @status)";
var cmdInsertTransaction =
new MySqlCommand(queryInsertTransaction, DbConnection.Instance().Connection);
cmdInsertTransaction.Parameters.AddWithValue("@id", historyTransaction.Id);
cmdInsertTransaction.Parameters.AddWithValue("@type", historyTransaction.Type);
cmdInsertTransaction.Parameters.AddWithValue("@amount", historyTransaction.Amount);
cmdInsertTransaction.Parameters.AddWithValue("@content", historyTransaction.Content);
cmdInsertTransaction.Parameters.AddWithValue("@senderAccountNumber",
historyTransaction.SenderAccountNumber);
cmdInsertTransaction.Parameters.AddWithValue("@receiverAccountNumber",
historyTransaction.ReceiverAccountNumber);
cmdInsertTransaction.Parameters.AddWithValue("@status", historyTransaction.Status);
insertTransactionResult = cmdInsertTransaction.ExecuteNonQuery();
if (updateAccountResult == 1 && insertTransactionResult == 1)
{
transaction.Commit();
return(true);
}
}
catch (BankError e)
{
transaction.Rollback();
return(false);
}
DbConnection.Instance().CloseConnection();
return(false);
}