at least if that property turns out not tohavea value. In Windows PowerShell you can check for a Null value simply by using the-eqcomparison operator
For i=0 To Ubound(SQL,2) ViewFile = Sql(18,i) Title = Sql(9,i) If Len(Title)>20 Then Title = Left(Title,20) &"..." End If Title = Dvbbs.HTMLEncode(Title) If ViewFile="" or IsNull(ViewFile) Then ViewFile = DvBoke.System_UpSetting(19) & Sql(10,i) End ...
我有一个ASP页面,其中显示了一个从sql中提取数据的表。大多数数据尚未填充,因此返回一个NULL。所讨论的数据类型是数字。当rs不为空时,我需要填充它,如果为空,则不填充。这就是我的东西 <%=If Not IsNull(rs("ContractValue")) Then FormatNumber(rs("ContractValue"),0) end if%> 但是如前所述,我得到...
sFor(8,0)="bmp":sFor(8,1)=6 sFor(9,0)="asp":sFor(9,1)=7 sFor(10,0)="jsp":sFor(10,1)=7 sFor(11,0)="js" :sFor(11,1)=7 sFor(12,0)="htm":sFor(12,1)=8 sFor(13,0)="html":sFor(13,1)=8 sFor(14,0)="shtml":sFor(14,1)=8 sFor(15,0)="zip":s...
CheckCardId= "身份证输入错误!" Exit Function End If If strMonth > 12 Or strDay > 31 Then CheckCardId= "身份证输入错误!" Exit Function End If Else CheckCardId= "身份证输入错误!" Exit Function End If Dim i, TotalmulAiWi For i = 0 To 16 ...
NullReferenceException when you use CommandBuilder Race conditions and deadlocks Use Trace and Debug classes Check program running Create a DCOM client server application Create SQL Server database programmatically Format strings to Right-Justify when an application calls printing Navigate XML with XPathNav...
Null Object Unknown Error When executed, the second statement in this example displays the output shown in Figure 6.4, proving that theInputBox()function always returns a string value. Figure 6.4: TheInputBox()function always returns a string value ...
if (matchArray == null) return false; var month = matchArray[2]; var day = matchArray[3]; var year = matchArray[1]; if (month < 1 || month > 12) return false; if (day < 1 || day > 31) return false; if ((month == 4 || month == 6 || month == 9 || month ==...
IsNull函数:返回Boolean值,指明表达式是否不包含任何有效数据(Null) IsObject函数:返回Boolean值指明表达式是否引用了有效的Automation对象 VarType函数:返回指示变量子类型的值 TypeName函数:返回一个字符串,提供有关变量的Variant子类型信息 Rnd 先利用Randomize初始化随机数生成器,Randomize作用是使产生的随机数不重复,然后...
第一个VBScript脚本 Setobjshell=CreateObject("Shell.Application")SetobjNS=objshell.namespace(&h2f)Setcolitems=objNS.itemsForEachobjitemIncolitemsWScript.Echoobjitem.nameNext 编译环境 VBSEdit安装方法 VBS脚本的注释 Vbs中使用单引号来注释”’”,注释的信息在vbs...