This is an
excerpt from the book
Advanced PL/SQL: The Definitive Reference by Boobal Ganesan.
The XMLATTRIBUTES function converts
the column data or the PL/SQL variable into attributes of
the parent element. This function must contain one or more
attributes in a comma separated list and name of the
attribute will be the column name or the variable name used
in the comma separated list respectively.
The prototype of the XMLATTRIBUTES
function is shown below,
XMLATTRIBUTES(<Attribute_Value1>[,<Attribute_Value2>...]])
In the below example, the employee’s
name is made an attribute using the XMLATTRIBUTE function,
whilst the employee’s personal information is made into
Multiple elements using the
XMLELEMENT function.
SELECT xmlelement(Employee,xmlattributes(first_name
||' '
||last_name AS Name), xmlelement(phone,phone_number)
,xmlelement(email,email),xmlelement(sal,salary))
XMLATTRIBUTES
FROM employees
WHERE employee_id IN (100,101);
Result:
<EMPLOYEE NAME="Steven
King"><PHONE>515.123.4567</PHONE><EMAIL>SKING</EMAIL><SAL>24000</SAL></EMPLOYEE>
<EMPLOYEE NAME="Neena Kochhar"><PHONE>515.123.4568</PHONE><EMAIL>NKOCHHAR</EMAIL><SAL>17000</SAL></EMPLOYEE>
===========================================
With Oracle 10gR2 and beyond, when using
Oracle XMLELEMENT, the value of the element could be an
expression or the name of the element.
SELECT
XMLELEMENT
(
EVALNAME ENAME,
XMLATTRIBUTES
(
EMPNO AS EVALNAME JOB||'_ID'
)
) EMP
FROM
EMP
WHERE
ENAME LIKE 'S%';
EMP
-----------------------------------
<SMITH
CLERK_ID="7369"></SMITH>
<SCOTT
ANALYST_ID="7788"></SCOTT>
 |
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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