Question

我正在建立一个网站，当我点击某个特定按钮时，它会显示数据或状态。但是当我单击它时，会出现将数据类型varchar转换为数字的错误。

这是我的代码

for

非常感谢

这是我的GetDataSet2的代码

Dim ds As New DataSet
    Try
        ds = GetDataSet2("dateadd(mm, datediff(mm, 0, last_check), 0) as DateMonthly, SUM((convert(decimal(5,2), left(duration, 3))))/count(*) as AverageMonthly", "tblServices_Status AS TSES, tblWeb_Apps as TWA", "TSES.web_apps_id = TWA.web_apps_id AND TWA.web_apps_id = '" & appid & "' AND MONTH(last_check) = MONTH(dateadd(dd, -1, GetDate())) AND YEAR(last_check) = YEAR(dateadd(dd, -1, GetDate()))", "dateadd(mm, datediff(mm, 0, last_check), 0)", "dateadd(mm, datediff(mm, 0, last_check), 0)")
        For Each dr As DataRow In ds.Tables(0).Rows
            lblAppAveMonthly.Text = Format(Val(dr("AverageMonthly")), "0.00") + "s"
        Next
    Catch ex As Exception
        Throw ex
    Finally
        ds.Dispose()
    End Try

Answer 1

我看到导致此错误的唯一可能的候选人是：

SUM((convert(decimal(5,2), left(duration, 3))))/count(*) as AverageMonthly

在duration列中查询无法将前3个字符转换为小数（5,2）数据类型的任何行。

如果你有SQL Server 2012或更高版本，那么TRY_PARSE（）函数在这里非常有用。

将数据类型varchar转换为数字时出错。用于显示数据

1 个答案: