Access 2002 / VBA - IIf

Question

考虑：

sqlAddress = "SELECT " _
& "address_line_1, address_line_2, city, postcode, state " _
& "FROM contacts " _
& "WHERE (contact_id =" & contact_id & ")"

Set rsAddress = dbs.OpenRecordset(sqlAddress)

If Not rsAddress.EOF Then
    addressStr = IIf(rsAddress("address_line_2")='', rsAddress("address_line_1") & Chr(13) + Chr(10) & rsAddress("city") & Chr(13) + Chr(10) & rsAddress("postcode") & Chr(13) + Chr(10) & rsAddress("state"), rsAddress("address_line_1") & Chr(13) + Chr(10) & rsAddress("address_line_2") & Chr(13) + Chr(10) & rsAddress("city") & Chr(13) + Chr(10) & rsAddress("postcode") & Chr(13) + Chr(10) & rsAddress("state"))
    Me.vcTBAddress.SetFocus
    Me.vcTBAddress = addressStr
End If

我想要做的是只显示address_line_2，以防它不为空并且不是空字符串。 IIf返回语法错误。我不明白为什么 - 我错过了什么？

Answer 1

答案当然是我填空了空字符串测试： rsAddress("address_line_2")=''。

正确的语法是：rsAddress("address_line_2")=""带双引号"，而不是单引号'。