上一次我们提到，Database icon 文档里面包含很多数据库属性信息。实际上它们都保存在 $Flags 域中，而这个域中每个字符都代表一个属性，列表如下（来源于 Notes C API 中的 stdnames.h 文件）：

Flag = Meaning / Action
4 = Allow Soft Deletes
Z = Enable LZ1 Compression
f = Do Not Allow Stored Forms
z = Do Not Maintain Unread Marks
h = Mark Parent Document on Reply or Forward
J = Use JavaScript when generating Web Pages
F = Launch Designated Frameset
n = Never Show Policy (ie. Never show About Database when first opened)
7 = Large UNK Table (ie. allow more fields in database)
6 = Allow Design Locking
K = Restore as lasted viewed by user
c = Show About Database if Modified
Q = Replicate Unread Marks to Clustered Servers Only
U = Replicate Unread Marks to All Servers (appears with Q set)
2 = Optimise Document Table Bitmap
3 = Maintain LastAccessed Property
1 = Don’t Support Specialised Response Hierarchy
M = Multilingual Database
X = Web Access Requires SSL Connection
8 = Web Access Don’t Allow URL Open
i = Display Images After Loading
5 = Allow Document Locking
g = Database Type = Library
j = Database Type = Personal Journal
b = Database Type = Domino Directory
B = Database Type = Directory Catalog
m = Database Type = Multi DB Search
u = Database Type = Portfolio
A = Database Type = Mailbox
r = Database Type = Mailfile
p = Always Show About Database Document (ie. When Opened in the Client Property)
l = Launch Designated Navigator
s = Launch Designated Navigator in Own Window (used in conjuction with l above)
a = Launch First Attachment in About Database Document
d = Launch First DocLink in About Database Document
P = Web Launch = Show About Database Document
S = Web Launch = Open Designated Frameset
E = Web Launch = Open Designated Page
L = Web Launch = Open Designated Navigator in its Own Window
D = Web Launch = Open First DocLink in About Database Document
T = Web Launch = Open Designated DocLink
V = Web Launch = Open First Document in Designated View

通过向这个域中增加（或除去）字符标记，即可设置（或取消）相应的属性。下面是一段具体的代码：

Set doc = db.GetDocumentByID(“FFFF0010”) ‘获得 Icon 文档
doc.~$Flags = doc.~$Flags(0) & “x” ‘x代表需要增加的属性
doc.Save (True, False)

数据库中的一些特殊元素，他们有着固定的 Note ID。如下表：

比如通过 db.GetDocumentByID(“FFFF0010”) 即可获得 Database icon 文档。而这个文档中保存了很多数据库属性信息，也就是说我们可以通过编程来修改这些数据库属性。是不是有点意思了呢？

请参考 Getting Default Elements in the Database

一般情况下，视图都是用来显示文档的。实际上通过更改视图 $FormulaClass 的值，我们可以让它显示其他的内容。参照下表：

比如我们一般的视图，$FormulaClass 的值为1，所以显示一般文档 ；如果是4，则显示所有表单设计元素（实际上，每个设计元素都可以说是一种特殊的文档）。另外还可以这样用：如果将 $FormulaClass 的值指定为 1548（4 + 8 + 512 + 1024），则可以同时显示表单、视图等几种设计元素。

修改 $FormulaClass 域的方法，可以通过类似如下的代码实现：

Set view= db.GetView(“FormView”)
Set doc = db.GetDocumentByUNID(view.UniversalID)
Call doc.ReplaceItemValue(“$FormulaClass”, “4”)

至于这样的视图有什么用，就要看自己的想像力了。比如创建一个包含所有设计元素的视图，就可以通过名字来查找设计元素文档了。

请参考 Modifying $FormulaClass in Views、Fun with $FormulaClass