Oracle PL/SQL Tutorial/XML/xmlelement
Create xml element with xmlelement function
<source lang="sql">
SQL> CREATE TABLE products(
2 product_id NUMBER(6), 3 name VARCHAR2(50), 4 category VARCHAR2(50), 5 price NUMBER(8,2), 6 min_price NUMBER(8,2) 7 );
Table created. SQL> SQL> select xmlelement( "Product",xmlattributes(p.product_id,p.name as "Name"),xmlforest(p.category as "Category",p.price as "price"))
2 from products p;
no rows selected SQL> SQL> drop table products; Table dropped. SQL> SQL></source>
Use XMLELEMENT to convert column data to xml format
Generating XML from "Ordinary" Tables
Oracle provides a function, XMLElement, that transforms data into XML format.
The function takes two arguments ?a the tag name and the data. Consider this example:
<source lang="sql">
SQL> -- create demo table SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 /
Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
-------------------- -------------------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> SQL> SELECT xmlelement("Name",first_name), xmlelement("ID",id),
2 xmlelement("City", city)
3 FROM employee;
XMLELEMENT("NAME",FIRST_NAME) XMLELEMENT("ID",ID) XMLELEMENT("CITY",CITY)
<Name>Jason</Name> <ID>01</ID> <City>Toronto</City> <Name>Alison</Name> <ID>02</ID> <City>Vancouver</City> <Name>James</Name> <ID>03</ID> <City>Vancouver</City> <Name>Celia</Name> <ID>04</ID> <City>Vancouver</City> <Name>Robert</Name> <ID>05</ID> <City>Vancouver</City> <Name>Linda</Name> <ID>06</ID> <City>New York</City> <Name>David</Name> <ID>07</ID> <City>New York</City> <Name>James</Name> <ID>08</ID> <City>Vancouver</City>
8 rows selected. SQL> SQL> SQL> -- clean the table SQL> drop table Employee
2 /
Table dropped. SQL> SQL></source>
XMLElement
<source lang="sql">
SQL> SQL> SELECT XMLElement("text",XMLAttributes(2 AS "x",2 AS "y"),2) FROM dual; XMLELEMENT("TEXT",XMLATTRIBUTES(2AS"X",2AS"Y"),2)
<text x="2" y="2">2</text></source>
