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Oracle XMLFOREST 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 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

 

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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