Oracle PL/SQL/XML/XMLElement

Create xml element with xmlelement function

 
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>

XMLElement: output result in XML

 

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            Tester
04   Celia      Rice       24-OCT-82 21-APR-99    2344.78            Manager
05   Robert     Black      15-JAN-84 08-AUG-98    2334.78            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            Manager
08   James      Cat        17-SEP-96 15-APR-02    1232.78 Vancouver  Tester

8 rows selected.
SQL>
SQL> -- XMLElement: transforms data into XML format.
SQL> -- The function takes two arguments ?the tag name and the data. Consider this example:
SQL>
SQL> SELECT xmlelement("Name",first_name), xmlelement("id",id), xmlelement("Date", start_date)
  2  FROM employee;
XMLELEMENT("NAME",FIRST_NAME)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
XMLELEMENT("ID",ID)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
XMLELEMENT("DATE",START_DATE)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
<Name>Jason</Name>
<id>01</id>
<Date>1996-07-25</Date>
<Name>Alison</Name>
<id>02</id>
<Date>1976-03-21</Date>
<Name>James</Name>
<id>03</id>
<Date>1978-12-12</Date>
<Name>Celia</Name>
<id>04</id>
<Date>1982-10-24</Date>
<Name>Robert</Name>
<id>05</id>
<Date>1984-01-15</Date>
<Name>Linda</Name>
<id>06</id>
<Date>1987-07-30</Date>
<Name>David</Name>
<id>07</id>
<Date>1990-12-31</Date>
<Name>James</Name>
<id>08</id>
<Date>1996-09-17</Date>

8 rows selected.
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /
Table dropped.
SQL>
SQL>