Question

我有以下格式的CSV文件：

"FIELD1";"FIELD2";"FIELD3";"FIELD4";"FIELD5";"FIELD6";  
"BABY";"333333";"0100-0100";"1";"3/2/2018";"88888";  
"BABY";"333333";"0100-0200";"2";"3/3/2018";"88888";  
"BABY";"444444";"0100-0300";"3";"3/4/2018";"88888";

我需要更新一个事务表和一个主表，其中事务表和主表有field2作为它们之间的公共，所以对于多行事务表，应该只有1行master，而事务表应该是首先更新，然后是主表。

下面的代码只读取2条记录并成功更新两个表，但是当读取第三行（最后一行）时，它只是跳过更新两个表。我需要帮助才能让代码正确更新文件中的所有记录。

Private Sub UpdateFromFile()

    Dim strSql As New StringBuilder()
    Dim strSql1 As New StringBuilder()

    'Read the CSV file
    Dim parser As New FileIO.TextFieldParser(path:="C:\IMPORTDATA\TEST.CSV") With {
        .Delimiters = New String() {";"},
        .HasFieldsEnclosedInQuotes = True,
        .TrimWhiteSpace = True
    }

    Dim RowValues As String()
    Dim PrevRowValues As String()
    Dim PrevRefNumber As String = ""

    '--First line is header, skip it
    parser.ReadLine()
    PrevRefNumber = ""

    Dim IsFirstTime As Boolean = True

    Do Until parser.EndOfData

        Do While True

            RowValues = parser.ReadFields()

            If IsFirstTime Then
                PrevRefNumber = RowValues(1)
                IsFirstTime = False
            End If

            If PrevRefNumber <> RowValues(1) Then
                Exit Do
            End If

            PrevRowValues = RowValues

            LblStatus.Text = "Status: Writing Line " & i.ToString & "..."
            strSql.AppendFormat("INSERT INTO ""Transaction"" (""Field1"", ""Field2"", ""Field3"", ""Field4"", ""Field5"") VALUES ('{0}','{1}','{2}',{3},'{4}')", RowValues(0), RowValues(1), RowValues(2), CDbl(RowValues(3)), RowValues(5))
            MessageBox.Show(strSql.ToString)

        Loop

        LblStatus.Text = "Status: Writing Master File..."

        strSql1.AppendFormat("INSERT INTO ""Master"" (""Field1"", ""Field2"", ""Field3"") VALUES ( '{0}', '{1}', '{2}')", PrevRowValues(0), PrevRowValues(1), PrevRowValues(5))
        MessageBox.Show(strSql1.ToString)

        PrevRefNumber = RowValues(1)
        strSql1.Clear()
    Loop

End Sub

End Class

Answer 1

如果有人感兴趣，我终于让代码正常工作了......

'--TextField Parser is used to read the csv file 
Dim parser As New FileIO.TextFieldParser(path:="C:\IMPORTDATA\TEST.CSV") With {
        .Delimiters = New String() {";"}, ' fields are separated by semicolon
        .HasFieldsEnclosedInQuotes = True, ' each of the values is enclosed with double quotes
        .TrimWhiteSpace = True
    }

Dim RowValues As String()
Dim PrevRowValues As String()
Dim PrevRefNumber As String = ""
Dim IsRefNumberSame As Boolean = False
Dim i As Integer = 1

    '--First line is header, skip it
    parser.ReadLine()

    Dim IsFirstTime As Boolean = True
Dim IsTransWritten As Boolean = False

Do While Not parser.EndOfData
            RowValues = parser.ReadFields


If IsFirstTime Then
            PrevRefNumber = RowValues(1)
            IsFirstTime = False
        End If

If PrevRefNumber <> RowValues(1) Then
            strSql1.AppendFormat("INSERT INTO ""master"" (""f1"", ""f2"", ""f3"") VALUES ( '{0}', '{1}', '{2}')", PrevRowValues(0), PrevRowValues(1), PrevRowValues(5))
            MessageBox.Show(strSql1.ToString)
            strSql1.Clear()
            PrevRefNumber = RowValues(1)
End If


        strSql.AppendFormat("INSERT INTO ""trans"" (""f1"", ""f2"", ""f3"", ""f4"", ""f5"", ""f6"") VALUES ('{0}','{1}','{2}',{3},'{4}',{5} )", RowValues(0), RowValues(1), RowValues(2), CDbl(RowValues(3)), RowValues(5), 1)
        MessageBox.Show(strSql.ToString)
        strSql.Clear()
        PrevRowValues = RowValues

Loop

    strSql1.AppendFormat("INSERT INTO ""master"" (""f1"", ""f2"", ""f3"") VALUES ( '{0}', '{1}', '{2}')", RowValues(0), RowValues(1), RowValues(5))
    MessageBox.Show(strSql1.ToString)

无法在VB.net中读取CSV文件的最后一条记录

1 个答案: