[求助] 代码运算太慢 - 专家坐堂 - Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

老师，以下代码运算太慢了，有更好的吗？

Dim cmd1 As new SQLCommand

cmd1.C

Dim cmd4 As new SQLCommand

cmd4.C

Dim cmd5 As new SQLCommand

cmd5.C

For Each rrr As Row In Tables("物料需求")

cmd1.CommandText = "Se lect FItemID From {t_ICItemCore} Where FNumber = '"& rrr("PartNo") & "'"

Dim Values = cmd1.ExecuteValues

If Values.Count > 0 Then

rrr("FItemID") = Values("FItemID")

End If

cmd4.CommandText = "Sel ect FPrice,FCyID,FTax From {t_SupplyEntry} Where FItemID = '" & rrr("FItemID") & "'and FUsed = 1 and FPrioritized = 1"

Dim Values4 = cmd4.ExecuteValues

If Values4.Count > 0 Then

rrr("UnitPrice_WithoutVAT") = Values4("FPrice")

rrr("FCyID") = Values4("FCyID")

rrr("FVAT") = Values4("FTax")

' rrr("FSupID") = Values4("FSupID")

End If

cmd5.CommandText = "Sel ect FName From {t_Currency} Where FCurrencyID = '" & rrr("FCyID") & "'"

Dim Values5 = cmd5.ExecuteValues

If Values5.Count > 0 Then

rrr("Currency") = Values5("FName")

End If

If rrr("Currency") ="人民币"

rrr("ExchangeRate") = 1

ElseIf rrr("Currency") ="欧元"

rrr("ExchangeRate") = 7.7

ElseIf rrr("Currency") ="瑞士法郎"

rrr("ExchangeRate") = 7

ElseIf rrr("Currency") ="美元"

rrr("ExchangeRate") = 6.7

End If

msgbox("Done !!!")

直接sql更新,如

dim sql as string = "update a set a.FItemID = (select top 1 FItemID from {t_ICItemCore} Where FNumber = a.PartNo), a.Currency = (Select top 1 FName From {t_Currency} Where FCurrencyID = a.FCyID) from 物料需求 a "

if Tables("物料需求").filter > "" then

sql = sql & " where " & Tables("物料需求").filter

end if

老师，这个不对，我要把Sql 表中的填入 foxtable 的表物料需求中。

物料需求如果是外部表，直接上面的sql即可。

如果是内部表或者临时表，可以考虑把需要查询的数据一次性加载出来使用，比如

cmd1.CommandText = "Se lect FItemID,FNumber From {t_ICItemCore} Where FNumber in ('"& dataTables("物料需求")GetComboListString("PartNo").replace("|","','") & "')"

Dim dt as datatable= cmd1.ExecuteReader

For Each rrr As Row In Tables("物料需求")

dim dr as datarow = dt.find("FNumber = '"& rrr("PartNo") & "'")

rrr("FItemID") = dr ("FItemID")

……

主题：[求助] 代码运算太慢