检查是否在 vbscript 中设置对象 [英] check if set object in vbscript

问题描述

我有

set newcon = Server.CreateObject("ADODB.Connection")

如果不是，我需要:

set newcon = nothing

我如何判断它是一个物体还是什么都没有?

how do I tell if it is an object or nothing?

我试过了

newcon is nothing

我得到需要的对象

如果我尝试 isobject 或 isnull 或 isempty 它不会给出真正的布尔值

If I try isobject or isnull or isempty it does not give the true bool val for it

有什么我可以尝试的真正有效的方法吗?

Is there anything I Can try that really works?

推荐答案

我相信你在使用 Is Nothing 测试之前不小心更改了 newcon:

I believe you accidentially changed newcon before testing it with Is Nothing:

>> set newcon = CreateObject("ADODB.Connection")
>> WScript.Echo 0, IsObject(newcon)
>>
0 -1
>> set newcon = Nothing
>> WScript.Echo 1, IsObject(newcon)
>>
1 -1
>> WScript.Echo 2, newcon Is Nothing
>>
2 -1
>> newcon = "oops"
>> WScript.Echo 3, newcon Is Nothing
>>
Error Number:       424
Error Description:  Object required
>> WScript.Echo 4, newconn Is Nothing ' oops
>>
Error Number:       424
Error Description:  Object required

如果您收到错误 434，则 newcon(或您真正测试的变量)不包含对象或空.

If you get Error 434, then newcon (or the variable you really test) doesn't hold an object or Nothing.

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