蓝老师，以下SQL数据库表[test].[dbo].[YW_采购询价]在按钮事件引用时，为什么只有在表内新增的同种物料_代码存在大于或等于两条记录时，才能提取单价？一条时提取不到单价，也无报错，是不是红色字体的代码写的不对？
Dim drs As List(Of DataRow)
drs = DataTables("请购计划二级_Table1").Select("单价 is null")
For Each dr As DataRow In drs
Dim i As Integer = Tables("请购计划二级_Table1").FindRow("单价 is null")
If i >=0 Then
Dim dz As Row = Tables("请购计划二级_Table1").Rows(i)
If dz IsNot Nothing AndAlso dz.IsNull("物料_代码")=False AndAlso dz.IsNull("物料_名称") = false AndAlso dz.IsNull("单价") = true Then
Dim cmd As New SQLCommand
cmd.C
cmd.CommandText = "SELECT 物料_单价 F ROM [test].[dbo].[YW_采购询价] where 物料_代码='" & dz("物料_代码") & "' and 物料_名称='" & dz("物料_名称") & "' and [_Identify] = (SELECT MAX([_Identify]) F ROM [test].[dbo].[YW_采购询价])"
dz("单价") = cmd.ExecuteScalar()
End If
End If
Next
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Post By：2020/9/19 22:31:00 [只看该作者]
