ASP自定义函数，仿VBA中域函数 DLookup

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Function DLookup(strFieldName, strTableName, strWhere, objConn)
    '参考Access VBA 中的DLookup函数
    '由于环境不同，加了ObjConn参数，直接将Adodb.connection直接调进来
    Dim strsql
    Dim rs
    Set rs = server.CreateObject("adodb.recordset")
    '下面要调用外部的一个自定义函数 checksql()
    strFieldName = checksql(strFieldName)
    If strWhere <> "" Then
        strWhere = " where " & strWhere
    End If
    strsql="select "&strfieldname&" from "&strtablename&" " & strwhere
    'debugstop strsql
    On Error Resume Next
    rs.Open strsql, objConn, 1, 1
    If Err <> 0 Then
        response.write Err.Description
        response.end()
    End If
   
    If rs.EOF And rs.BOF Then
        DLookup = ""
    Else
        '要调用一个自定义函数 NZ
        '详细内容请参考 ACCESS VBA 帮助中的资料
        DLookup = Nz(rs(strFieldName), "")
    End If
    rs.Close
End Function

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