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所以我的编码有问题，想知道是否有人可以帮助我。

基本上我正在使用 VB.NET 和 MSSQL 制作一个程序来查找用户设置的给定范围之间的缺失数字。该程序将从表格中读取并在文本框上给出输出。到目前为止，上述代码是我能想到的。但问题是，我得到了错误的输出，而不是我想要的。这是输出的图像。

Function FindingMissingNumber() As String

    Dim intX As Integer = Nothing
    Dim intY As Integer = Nothing
    Dim strSting As String = Nothing
    Dim strSqlQUery As String = Nothing
    Dim cmdSqlCommand As Data.SqlClient.SqlCommand = Nothing
    Dim rdrDataReader As Data.SqlClient.SqlDataReader = Nothing

    '------------------------------------------------------------------------------------------------------------------------
    '-> Process
    '------------------------------------------------------------------------------------------------------------------------
    strSqlQUery = "Select ExReportPolicyNo From DBReport Order by ExReportPolicyNo"
    Dim msSqlConnection As New Data.SqlClient.SqlConnection()
    'NOTE - You may need to CHECK your connection string!!! in the line below
    msSqlConnection.ConnectionString = "Data Source=SISBSQL\SISBSQL;Initial Catalog=ExceptionReport;User ID=sa;Password=123;"
    cmdSqlCommand = New Data.SqlClient.SqlCommand(strSqlQUery, msSqlConnection)
    If cmdSqlCommand.Connection.State = Data.ConnectionState.Closed Then cmdSqlCommand.Connection.Open()
    rdrDataReader = cmdSqlCommand.ExecuteReader()
    If rdrDataReader.HasRows Then
        Do While rdrDataReader.Read()
            intX = txtRangeLeft.Text
            intY = txtRangeRight.Text
            'intY = rdrDataReader.GetValue(rdrDataReader.GetOrdinal("ExReportPolicyNo"))

            Do While intX <> intY
                intX = intX + 1
                If intX <> intY Then
                    strSting = strSting & intX & ", "    'if it is not, then record the non sequential number into the string
                Else
                    Exit Do
                End If
            Loop
        Loop
    End If
    If cmdSqlCommand.Connection.State = Data.ConnectionState.Open Then cmdSqlCommand.Connection.Close()
    'return string
    Return strSting
    'tidy up
    intX = Nothing
    intY = Nothing
    strSting = Nothing
    strSqlQUery = Nothing
    cmdSqlCommand = Nothing
    rdrDataReader = Nothing

End Function

如您所见，程序将其循环多次，并给出错误的输出。输出应该只读“286118, 286120, 286121”。问题是我哪里出错了？

4

1 回答 1

1

试试这个（使用 linq）

更改查询以返回开始值和结束值之间的行

Select distinct ExReportPolicyNo From DBReport 
Where ExReportPolicyNo between @start and @end  
Order by ExReportPolicyNo

从您的查询创建列表：

Dim originalList as List(Of Integer)
If rdrDataReader.HasRows Then
Do While rdrDataReader.Read()
originalList.Add(rdrDataReader.GetInt(0))
Loop
End If

从您的开始和结束编号创建范围列表

//Dim rangeList = Enumerable.Range(286117, 286121 - 286117 + 1).ToList()
Dim starti = Int32.Parse(txtRangeLeft.Text)
Dim endi = Int32.Parse(txtRangeRight.Text)
Dim rangeList = Enumerable.Range(starti, endi - starti + 1).ToList()

查找所有丢失的数字

Dim missingList = originalList.Except(rangelist)

从上面的列表中创建 CSV 字符串

strString = String.Join(",", missingList.Select(x => x.ToString()).ToArray())
于 2012-12-20T04:51:04.933 回答