Question

我们正在Windows CE 5.0设备上部署SQLAnywhere解决方案，并在第一个SQL语句中遇到错误。

定义是......

Dim dbf As String = "dbf=\Program Files\sfpwarehousescanner\BRAINY2_remote.udb"
Public conn As ULConnection = New iAnywhere.Data.UltraLite.ULConnection(dbf)
Public cmdDel As ULCommand
Public cmdSel As ULCommand
Public cmdUpd As ULCommand

违规代码......

Public Sub GetDefaults()
  Dim SQL As String = ""
  Try
    SQL = "SELECT ISNULL(Dot, 'T'), ISNULL(Distance, 'L'), ISNULL(Force_Change, 'Y') " _
    & "FROM cims.scan_settings " _
    & "WHERE username = '" + UName.ToString + "'"

    cmdSel = conn.CreateCommand()
    cmdSel.CommandText = SQL

    Dim ULReader As ULDataReader

    ULReader = cmdSel.ExecuteReader

我们收到的错误是......

Error (level = 7) in General.GetDefaults: 
IDS_AMP_INVALID_OPER_ON_EXECUTE_CMD - 
SELECT ISNULL(Dot, 'T'), ISNULL(Distance, 'L'), ISNULL(Force_Change, 'Y') 
FROM cims.scan_settings WHERE username = 'test'

非常感谢任何帮助！

我现在已经将sql简化为'SELECT * FROM scan_settings'，我仍然遇到同样的问题。

Answer 1

我没有在应用中包含ulnet12.dll和ulnetclient12.dll。现在跑得很好。

Answer 2

错误消息似乎表明数据库无法进行某些比较。对于ISNULL，所有表达式必须具有可比性（http://dcx.sybase.com/index.html#1201/en/dbreference/isnull-function.html）。如果Dot，Distance和Force_Change数据类型与CHAR不可比，则可能是问题。

Windows CE 5.0上的Ultralite数据库SQLAnywhere中的SQL错误 - VB.net

2 个答案: