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Oracle XMLATTRIBUTES tips

Oracle PL/SQL tips by Boobal Ganesan

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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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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