This is an
excerpt from the book
Advanced PL/SQL: The Definitive Reference by Boobal Ganesan.
The XMLFOREST function accepts one or
more parameters. This function converts all its argument
parameters into XML data and then returns an XML fragment,
which is the concatenation of these converted parameters.
The tags take its name from the arguments passed.
The prototype of the XMLFOREST
function is shown below,
XMLFOREST(<Attribute_value1>[,<Attribute_value2>...]])
In the below example, the personal
information of the employees is formed into tags
individually and are concatenated with each other as shown
below,
SELECT
xmlforest(First_name,
last_name, phone_number, email) XMLFOREST
FROM employees
WHERE employee_id IN (100,101);
Result:
<FIRST_NAME>Steven</FIRST_NAME><LAST_NAME>King</LAST_NAME>
<PHONE_NUMBER>515.123.4567</PHONE_NUMBER><EMAIL>SKING</EMAIL>
<FIRST_NAME>Neena</FIRST_NAME><LAST_NAME>Kochhar</LAST_NAME>
<PHONE_NUMBER>515.123.4568</PHONE_NUMBER><EMAIL>NKOCHHAR</EMAIL>
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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