In Adaptive Server version 12.5.2, the interpretation of the “//” operator has been changed to reflect the XPath standard.
For example, the following returns the title of each book whose author’s first name is “Mary.”
/bookstore/book[author/first-name = "Mary"]/title
In Adaptive Server 12.5.1, you could also reference the first name using the “//” operator:
/bookstore/book[//first-name = "Mary"]/title
Adaptive Server 12.5.1 interpreted the leading “//” operator
as a relative reference to all first-name elements
contained in the current book element. The XPath standard, however,
specifies that a leading “/” operator
is an absolute reference that references every first-name element
in the entire document. To reference the first-name elements
contained in the current book, you must precede the “//” operator
with the “.” operator to indicate the current
context:
/bookstore/book[.//first-name = "Mary"]/title
Adaptive Server 12.5.2 adopts the XPath standard interpretation of the “//” operator. Queries using Adaptive Server 12.5.1 that were written in the second example’s form raise an exception error should be rewritten in form of the third example.
| Copyright © 2004. Sybase Inc. All rights reserved. |
|
|
