ShipOrders, , Boutique Fudge . . , , . UnitsInStock, .
UnitsInStock, . , Access?
, , , .
, . , , Access , . , ( DAO).
DAO , . .
* DAO . , . (, , ), , .
■ DAO . SQL- (. 6).
DAO . , CurrentDb. Execute, SQL-, :
CurrentDb.Execute MyUpdateCommand
, , .
Recordset. CurrentDb. OpenRecordset SQL- .
Dim Recordset
Set Recordset = CurrentDb.OpenRecordset(MySelectCommand)
Recordset , . Recordset.MoveNext. , , Recordset.EOF, (end-of-file). True, .
Recordset . Recordset.EOF , , Access Recordset. . MoveNext : Do While Recordset.EOF = False
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' ProductName ■ MsgBox Recordset("ProductName")
' Recordset.MoveNext
Loop
, , , . ( .)
1 Sub UpdateStock()
' , DataAccessError
2 On Error GoTo DataAccessError
' SELECT
3 Dim Query
4 Query = _
"SELECT ProductID, Quantity FROM OrderDetails WHERE OrderID=" & ID
'
5 Dim Recordset
6 Set Recordset = CurrentDb.OpenRecordset(Query)
' .
'
7 Do Until Recordset.EOF
' ID
8 Dim ProductID, Quantity
9 ProductID = Recordset("ProductID"}
10 Quantity = Recordset("Quantity")
' UPDATE,
'
11 Dim UpdateCommand
12 UpdateCommand = _
"UPDATE Products SET UnitsInStock = UnitsInStock-" & _
13 Quantity & " WHERE ID=" & ProductID
'
14 CurrentDb.Execute UpdateCommand
' ( )
15 Recordset.MoveNext
16 Loop
'
17 Recordset.Close
18 CurrentDb.Close
19 Exit Sub
20 DataAccessError:
' .
'
21 MsgBox Err.Description
22 End Sub
.
■ 1 . , , , Ship () .
■ 2 Access , . , .
■ 34 SQL-, OrderDetails, . ( SQL- SELECT . . " " 6.)
■ 56 Recordset.
■ 7 , Recordset.
■ 810 ProductID Quantity
OrderDetails ( Recordset).
■ 1113 SQL- UPDATE. . : UPDATE Products SET UnitsInStock = UnitslnStock-4 WHERE ID= 14. 4 14 .
■ 14 .
■ 1516 ( , Recordset ).
■ 1718 .
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■ 19 . , - , !
■ 2022 , - . .
, , . , . - , . !
.
D D
, Microsoft - , ADO (ActiveX Data Objects, ActiveX). DAO, ADO .
, Microsoft ADO , , SQL Server, a DAO Access.
Access (), ADO DAO Access. ( Microsoft, , , .) , DAO, Access. , DAO , . ADO VB-, , , DAO, , - , ADO DAO.
VI
