循环后提交更改 - 仅保存最后一条记录
Submitchanges after a loop - only last record saved
下面的代码可以运行,但是它只保存了循环中的最后一条记录,我不明白为什么。我认为 Submitchanges()
在正确的位置,在循环的末尾。有人可以告诉我出了什么问题吗?谢谢
Sub POPULATE_CHAIN()
Dim newChain As New CHAIN
Dim dpSTRIKE As Integer
'get list of Options Contracts
Dim lstOPT = From Z In DATA.OPTIONs, X In DATA.UDLies
Where X.UDLY_SYM = Z.UDLY_SYM
Select Z.CONTRACT, Z.STRIKE_GAP, X.UDLY_LAST
Dim dctOPT = lstOPT.ToDictionary(Function(Z) Z.CONTRACT)
For Each key In dctOPT.Keys
For COUNT = 1 To 5
dpSTRIKE = 1850 + 5 * COUNT
Dim lkup = From Z In DATA.CHAINs
Select Z
Dim RCD_EXISTS As Boolean = lkup.Any(Function(Z) Z.CONTRACT = dctOPT(key).CONTRACT And Z.P_C = "C" And Z.STRIKE = dpSTRIKE)
If RCD_EXISTS = False Then
newChain.CONTRACT = dctOPT(key).CONTRACT
newChain.P_C = "C"
newChain.STRIKE = dpSTRIKE
DATA.CHAINs.InsertOnSubmit(newChain)
Else
newChain.CONTRACT = dctOPT(key).CONTRACT
newChain.P_C = "C"
newChain.STRIKE = dpSTRIKE
End If
Next
Next
DATA.SubmitChanges()
End Sub
Dim newChain As New CHAIN
应该在Fore Each里面,正好在second for里面。
因为它是在循环外声明的,所以它将与 table 分离并再次附加到 table。所以它只会被插入到最后一行。
下面的代码可以运行,但是它只保存了循环中的最后一条记录,我不明白为什么。我认为 Submitchanges()
在正确的位置,在循环的末尾。有人可以告诉我出了什么问题吗?谢谢
Sub POPULATE_CHAIN()
Dim newChain As New CHAIN
Dim dpSTRIKE As Integer
'get list of Options Contracts
Dim lstOPT = From Z In DATA.OPTIONs, X In DATA.UDLies
Where X.UDLY_SYM = Z.UDLY_SYM
Select Z.CONTRACT, Z.STRIKE_GAP, X.UDLY_LAST
Dim dctOPT = lstOPT.ToDictionary(Function(Z) Z.CONTRACT)
For Each key In dctOPT.Keys
For COUNT = 1 To 5
dpSTRIKE = 1850 + 5 * COUNT
Dim lkup = From Z In DATA.CHAINs
Select Z
Dim RCD_EXISTS As Boolean = lkup.Any(Function(Z) Z.CONTRACT = dctOPT(key).CONTRACT And Z.P_C = "C" And Z.STRIKE = dpSTRIKE)
If RCD_EXISTS = False Then
newChain.CONTRACT = dctOPT(key).CONTRACT
newChain.P_C = "C"
newChain.STRIKE = dpSTRIKE
DATA.CHAINs.InsertOnSubmit(newChain)
Else
newChain.CONTRACT = dctOPT(key).CONTRACT
newChain.P_C = "C"
newChain.STRIKE = dpSTRIKE
End If
Next
Next
DATA.SubmitChanges()
End Sub
Dim newChain As New CHAIN
应该在Fore Each里面,正好在second for里面。 因为它是在循环外声明的,所以它将与 table 分离并再次附加到 table。所以它只会被插入到最后一行。