方法一 if IsNull(Me.新_退休费) = True Then Me.新_退休费 = 0 方法二 if Nz(Me.原_退休费) = Me.原_退休费 Then Me.原_退休费 = 0 有些时候,一些初接触Access的朋友容易犯这样的错误:if Me.新_退休费 = "" Then Me.新_退休费 = 0 以下是Access帮助中NZ的内容 当Variant 类型的值为 Nu...
select iif( isnull(字段) ,0,1)这是如果这时字段为null，返回为0，不为null返回1,Aceess里isnull只有一个参数，也只会返回true或者false,所以判断一般用iff，希望可以解决你的问题
Me.Text30 = DLookup("[数值]", "Ajtust table", "[代码]='" & Me.Combo181 & "'And [日期]=#" & Me.Text41.Value & "#")If isnull(Me.Text30) Then '这里要用 ISNULL()就没问题了Me.Text30.Value = 0End If
MsgBox"文本框没有输入完整,请重新输入"Exit Sub End If End If Next'给花名册写数据 Set 记录集=CurrentDb.OpenRecordset("花名册")条件="学校='"&Text学校&"'AND班级='"&Text班级&"'AND姓名='"&Text姓名&"'AND电话='"&Text电话&"'"IfDCount("学校","花名册",条件)=0Then 记录集.AddNew 记录集!
'If A = Null Then ' 永远都会得到 Null '而要使用: 'If IsNull(A) Then '哪一种数据会等于 Null 呢?除了含有 Null 运算式之外, 就是没有输入任何数据的 '“数据字段”(在数据库中) 会等于 Null。 '后补:B 的默认值是 vbNullString(这个才是空字符串),不是 ""(这个叫零长度的字符串),尤其在...
access判断查询的结果是否为空,等同于SQL ISNULL() Select iif(IsNull( express ), value1, value2 ) From TableName iif(IsNull( express ), value1, value2 ) 相当于: If express Is Null Then Return value1 Else Return value2 End if
As you can see, changing a file's permissions is accomplished in several steps. First, a file is opened. Then, the file's security object (of type FileSecurity) is retrieved by a call to the GetAccessControl method. This object contains, among other things, an ordered set of access ...
If a web server is configured to host only a single domain and to also respond to requests to the server IP address for the socket connection, then the policy sections for sockets can be combined with the Silverlight policy file used for the WebClient and HTTP classes, if one is used. ...
If the fault persists after the preceding steps, restart the AR and then reconfigure Internet access by referring toInternet Access Wizard. However, restarting the AR may interrupt services. Evaluate the impact on services before restarting the AR. To restart an AR and restore the factory settings...
If the fault persists after the preceding steps, restart the AR and then reconfigure Internet access by referring toInternet Access Wizard. However, restarting the AR may interrupt services. Evaluate the impact on services before restarting the AR. To restart an AR and restore the factory settings...