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sql - update statement with variable parameters - how?

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Last Modified: 2021-04-21
I've got my insert statement working recursively, but I don't know how to write the update statement to work in the same way. The way it is now just complains about being invalid.

Can anyone help re-write the statement so it works the same way as the insert above it, using string variables?

its an access database fyi
<%
  'variables
  dim MM_editCmd2, Connstring, Sql
  dim strcustomer_id, strtitle, strbookID, strsales_amnt

Set MM_editCmd2 = Server.CreateObject("ADODB.Connection")

' assign variables to items in the forms collection.
 
  'database connection
  'MM_editCmd2.provider = provider
  MM_editCmd2.ConnectionString = MM_conn_STRING
  MM_editCmd2.Open
  
While (NOT WA_eCart_EOF(bookshop))
'Sql statement to insert the data
 strcustomer_id = identityValue
  strtitle = cStr(WA_eCart_DisplayInfo(bookshop, "Name"))
  strbook_ID = cStr(WA_eCart_DisplayInfo(bookshop, "ID"))
  strsales_amnt = cStr(WA_eCart_DisplayInfo(bookshop, "Price"))
  
  Sql="INSERT INTO Sales (customer_id, title, bookID, sales_amnt) VALUES ('" _
  			& strcustomer_id & "','" & strtitle & "','" _ 
				& strbook_ID & "','" & strsales_amnt & "')"
' execute it
  MM_editCmd2.Execute(Sql)
set bookshop = WA_eCart_MoveNext(bookshop)
wend
set bookshop = WA_eCart_MoveFirst(bookshop)
MM_editCmd2.Close
%>

<%'update stock 
'variables
Dim MM_updateStock, strquantity, Sql2
Set MM_updateStock = Server.CreateObject ("ADODB.Connection")
MM_updateStock.ConnectionString = MM_conn_STRING
MM_updateStock.Open
While (NOT WA_eCart_EOF(bookshop))
Sql statement to insert the data
strquantity = cStr(WA_eCart_DisplayInfo(bookshop, "quantity"))
strbookID = cStr(WA_eCart_DisplayInfo(bookshop, "ID"))
  
Sql2="UPDATE Stock set quantity = (quantity - 1) WHERE EXISTS (SELECT bookID FROM Sales WHERE Sales.bookID = Stock.bookID) VALUES ('" _& strquantity & "','" & strbookID & "')"
  
execute it
  'MM_updateStock.Execute(Sql2)
set bookshop = WA_eCart_MoveNext(bookshop)
wend
set bookshop = WA_eCart_MoveFirst(bookshop)

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