Question

我想提出这个问题....如果循环中只有1个假，那么它将不会插入到数据库中，反之亦然，如果全部为真，那么它将插入数据库。

这是我的代码

Public Function Check_Foreign_Key(ByVal select_column_name As String, ByVal table_name As String, ByVal where_column_name As String, ByVal where_value As String, ByRef Foreign_Key As String) As Boolean
    Dim dt_service_provider_id As DataTable = ExecuteSQLQuery("select " & select_column_name & " from " & table_name & " where " & where_column_name & " = '" & where_value & "'")
    If dt_service_provider_id.Rows.Count = 0 Then
        Return False
    Else
        Foreign_Key = dt_service_provider_id.Rows(0).Item(0).ToString()
        Return True
    End If
End Function 


    For Each dr As DataRow In dt.Rows
     Dim dt_rows as Integer = 0
     Dim site_id As Boolean = Check_Foreign_Key("site_id", "sites", "site_code", dr(2).ToString, dt_fk)
        If dr(0).ToString.Length > 50 And dr(0).ToString = "" And dr(0).ToString Is Nothing Then
            get_error(dt.TableName, dt.Columns(2).ToString, dt_row.ToString, "Character is greater than 50")
            'in here i want to continue checking go to next, i think i got error in cheking if dr(0) is empty
         Else
             If dr(1).ToString.Length > 50  And dr(1).ToString = "" And dr(1).ToString Is Nothing Then
               get_error(dt.TableName, dt.Columns(2).ToString, dt_row.ToString, "Character is greater than 50")
               'in here i want to continue again to next
              Else
               Select Case site_id
                Case False
                  get_error(dt.TableName, dt.Columns(2).ToString, dt_row.ToString, dr(2).ToString)
                  Return
                End Select
              End If
            End If
          dt_row += 1
     Next

这是我唯一知道的代码但不幸的是我无法得到我的逻辑它总是插入而不是它有1个错误

Answer 1

试试这个

Private SaveToDB()
    For Each dr As DataRow In dt.Rows
     Dim site_id As Boolean = Check_Foreign_Key("site_id", "sites", "site_code", dr(2).ToString, dt_fk)
        Select Case site_id
           Case False
              get_error(dt.TableName, dt.Columns(2).ToString, dt_row.ToString, dr(2).ToString)
              Return

         End Select
     Next

    'if you got here means no error
    'NOTE: You should loop again and save the rows
     For Each dr As DataRow In dt.Rows
        'Your code to save into the database here
     Next
End Sub

Answer 2

希望这可以解决问题

Dim blnAllTrue As Boolean = True
For Each dr As DataRow In dt.Rows
    Dim site_id As Boolean = Check_Foreign_Key("site_id", "sites", "site_code", dr(2).ToString, dt_fk)
    blnAllTrue = blnAllTrue And site_id
    If site_id = False Then
          get_error(dt.TableName, dt.Columns(2).ToString, dt_row.ToString, dr(2).ToString)
    End If
Next
If blnAllTrue = True Then
    'insert into your database
End If

在vb.net中的select case中循环相同的情况

2 个答案: