This is an
excerpt from the book
Advanced PL/SQL: The Definitive Reference by Boobal Ganesan.
This function generates an XML
comment using the input string passed as its parameter. The
input string is converted to the form
<!--Input_string-->
which is the W3C standard for placing comments in an XML
document.
%
Note: The
input string passed to this function cannot
have two consecutive hyphens. If it does,
the function will fail with an appropriate
error as this disrupts the comment format.
|
When the input parameter is passed as
Null, the function returns Null as its resultant.
SELECT xmlcomment('This is a
comment line') xmlcomment FROM DUAL;
Result:
<!--This is a comment line-->
XMLCONCAT
joins multiple xml elements together; XMLFORESTworks similarly but accepts number, characters,
dates, and XMLTYPE.
SELECT
XMLCONCAT
(
XMLELEMENT(EMPNO, EMPNO),
XMLELEMENT(ENAME, ENAME)
),
XMLFOREST
(
EMPNO,
ENAME
)
FROM
EMP
WHERE
ENAME='SCOTT';
XMLCONCAT(XMLELEMENT(E
XMLELE XMLFOREST(EMPNO,ENAME)
----------------------
-----------------------------
< EMPNO>7788</EMPNO>
<EMPNO>7788</EMPNO>
< ENAME>SCOTT</ENAME>
<ENAME>SCOTT</ENAME>
XPATH
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Need to learn to program with PL/SQL?
For complete notes on programming in PL/SQL, we
recommend the book
Advanced PL/SQL: The Definitive Reference by Boobal Ganesan.
This is a complete book on PL/SQL with
everything you need to know to write efficient and
complex PL/SQL code. |
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