vb.net,windows,visual-studio-2010,ms-access , How to execute four queries once and then check success or failure?
How to execute four queries once and then check success or failure?
I need to execute four queries and then if there is success must return true otherwise false.
The queries affect the database but the function returns false
Private Function save_to_data()
Dim success As Boolean = False
Dim conn As OleDbConnection = GetDbConnection()
Dim total_due As Decimal = sanitize(txt_total_due.Text)
Dim amount_paid As Decimal = sanitize(txt_due.Text)
Dim discount As Decimal = sanitize(txt_discount.Text)
Dim balance As Decimal = sanitize(txt_balance.Text)
Dim cmdfoods As New OleDbCommand("UPDATE foods SET status='billed' WHERE customer_id = " & lbl_id.Text & "", conn)
Dim cmdservices As New OleDbCommand("UPDATE services SET status = 'billed' WHERE customer_id = " & lbl_id.Text & "", conn)
Dim cmdreservations As New OleDbCommand("UPDATE reservations SET nights = 4 WHERE customerid = " & lbl_id.Text & "", conn)
Dim bill As New OleDbCommand("INSERT INTO bills(customer_id, accomendation, food, service, total_due, amount_paid, discount, balance, transaction_date) VALUES " & _
"(" & lbl_id.Text & ", " & accomendation_total & ", " & food_total & ", " & service_total & ", " & total_due & ", " & amount_paid & " " & _
", " & discount & ", " & balance & ", '" & Date.Now & "')", conn)
If cmdfoods.ExecuteNonQuery And cmdservices.ExecuteNonQuery And cmdreservations.ExecuteNonQuery And bill.ExecuteNonQuery Then
success = True
success = False
There a number of other problems with the code (sql injection, sharing a connection among several commands), but here's a step in the right direction:
success = True
success = False
A more-complete solution:
Private Function save_to_data()
Dim sql As String = _
"UPDATE foods SET status='billed' WHERE customer_id = ? ;" & _
"UPDATE services SET status = 'billed' WHERE customer_id = ? ;" & _
"UPDATE reservations SET nights = 4 WHERE customerid = ? ;"
"INSERT INTO bills(" & _
"customer_id, accomendation, food, service, total_due, amount_paid, discount, balance, transaction_date" & _
") VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?);"
Using conn As OleDbConnection = GetDbConnection(), _
cmd As New OleDbCommand(sql, conn)
cmd.Parameters.Add("food_customer_id", OleDbType.Integer).Value = lbl_id.Text
cmd.Parameters.Add("serv_customer_id", OleDbType.Integer).Value = lbl_id.Text
cmd.Parameters.Add("res_customer_id", OleDbType.Integer).Value = lbl_id.Text
cmd.Parameters.Add("bill_customer_id", OleDbType.Integer).Value = lbl_id.Text
cmd.Parameters.Add("accomendataion", OleDbType.VarChar).Value = accomendation_total
cmd.Parameters.Add("food_total", OleDbType.Decimal).Value = food_total
cmd.Parameters.Add("service_total", OleDbType.Decimal).Value = service_total
cmd.Parameters.Add("total_due", OleDbType.Decimal).Value = total_due
cmd.Parameters.Add("amount_paid", OleDbType.Decimal).Value = amount_paid
cmd.Parameters.Add("discount", OleDbType.Decimal).Value = discount
cmd.Parameters.Add("balance", OleDbType.Decimal).Value = balance
cmd.Parameters.Add("transaction_date", OleDbType.Date).Value = Date.Now
Return (cmd.ExecuteNonQuery() > 0)
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