Question

我试图从45列中获得43个总数。在表中，它们被定义为整数。

   Dim connStr, cmdStr As String
   connStr = ConfigurationManager.ConnectionStrings("astsql").ConnectionString
   cmdStr = "SELECT (SUM([index]),SUM([01]),SUM([02]),SUM([03]),SUM([04]),SUM([05]),SUM([06]),SUM([07]),SUM([08]),SUM([09]),SUM([10]),SUM([11]),SUM([12]),SUM([13]),SUM([14]),SUM([15]),SUM([16]),SUM([17]),SUM([18]),SUM([19]),SUM([20]),SUM([aa]),SUM([ab]),SUM([ac]),SUM([ad]),SUM([ae]),SUM([af]),SUM([ag]),SUM([ah]),SUM([ai]),SUM([aj]),SUM([ak]),SUM([al]),SUM([am]),SUM([an]),SUM([ao]),SUM([ap]),SUM([aq]),SUM([ar]),SUM([as]),SUM([at]),SUM([grsc]),SUM([grkr]),SUM([grkn])) FROM [count];"
    Dim totalcount As Integer = 0
    Dim n As Integer = 0
    Try
        Using conn As New SqlConnection(connStr)
            Using cmd As New SqlCommand(cmdStr, conn)
                conn.Open()
                cmd.ExecuteNonQuery()
                Using myreader = cmd.ExecuteReader()
                    While myreader.Read()
                        totalcount = totalcount + Convert.ToInt32(myreader(n))
                        n = n + 1
                    End While
                End Using
                conn.Close()
                cmd.Dispose()
                conn.Dispose()
            End Using
        End Using
    Catch ex As Exception
        Label5.Text = ex.ToString()
    End Try

这是我的错误代码：

System.Data.SqlClient.SqlException（0x80131904）：＆＃39;附近的语法不正确，＆＃39;。
  在System.Data.SqlClient.SqlConnection.OnError（SqlException异常，布尔breakConnection，Action 1 wrapCloseInAction) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action 1 wrapCloseInAction）
  在System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning（TdsParserStateObject stateObj，Boolean callerHasConnectionLock，Boolean asyncClose）
  在System.Data.SqlClient.TdsParser.TryRun（RunBehavior runBehavior，SqlCommand cmdHandler，SqlDataReader dataStream，BulkCopySimpleResultSet bulkCopyHandler，TdsParserStateObject stateObj，Boolean＆amp; dataReady）
  在System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds（String methodName，Boolean async，Int32 timeout，Boolean asyncWrite）
  在System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery（TaskCompletionSource`1完成

Answer 1

除非您添加SUM，否则不应将cmdStr = "SELECT (SUM([index])+SUM([01])+SUM([02])+SUM([03])+SUM([04])...) FROM [count];"括在括号中。用加号替换逗号将解决问题：

ExecuteScalar

现在您的查询返回一个号码，因此您可以使用ExecuteReader代替conn.Open() totalcount = Convert.ToInt32(cmd.ExecuteScalar()) conn.Close()：

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所选列的总数

1 个答案: