Upgrade databases
statementsand a path that only visits the root is represented by a single slash. For levels underneath the
root, each label is encoded as a sequence of integers separated by dots.
Comparison between children is performed by comparing the integer sequences separated by
dots in dictionary order. Each level is followed by a slash. Therefore a slash separates parents
from their children. For example, the following are valid
paths of lengths 1, 2, 2, 3,
and 3 levels respectively:
Nodes can be inserted in any location. Nodes inserted after
but before
can be
represented as. Nodes inserted before
have the logical representation as a negative
number. For example, a node that comes before
can be represented as. Nodes
can’t have leading zeros. For example,
is valid, but
isn’t valid. To prevent
errors, insert nodes by using the
GetDescendant
method.
The
data type can be converted to other data types as follows:
Use the
ToString
method to convert the
value to the logical representation as
a
data type.
Use
Read (Database Engine) by using CSharp
and
Write
to convert
to.
To transmit
parameters through SOAP, first cast them as strings.
When a database is upgraded to a newer version of SQL Server, the new assembly and the
data type are automatically installed. Upgrade advisor rules detect any user type or
assemblies with conflicting names. The upgrade advisor advises renaming of any conflicting
assembly, and either renaming any conflicting type, or using two-part names in the code to
refer to that preexisting user type.
If a database upgrade detects a user assembly with conflicting name, it automatically renames
that assembly and put the database into suspect mode.
/
/1/
/0.3.-7/
/1/3/
/0.1/0.2//1/2//1/3//1/2.5/0/1/1//1/-1//1/1.1//1/1.01/