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Oracle Pipelined Function Example

This Oracle tutorial shows how to create Pipelined function. Follow these steps:

1. Create a Type Object

For Oracle pipelined function, we must have a type object through which we can send the rows. Create one as below:

CREATE OR REPLACE TYPE t_list AS TABLE OF VARCHAR2(2000);
/

2. Create a Stored Function as PIPELINED

The following function uses the above type to return the values. And rows produce one by one through a cursor based on a SQL query:

CREATE OR REPLACE FUNCTION get_values RETURN t_list
     PIPELINED
IS   l_list t_list;
     w_row_count   NUMBER := 0;
BEGIN
          for cur in
          ( SELECT 'LINE' || level as value
          FROM dual CONNECT BY
               level <= 20
               ) loop
              PIPE ROW ( cur.value );
                        w_row_count := w_row_count + 1;
          end loop;
     dbms_output.put_line('Total ' || w_row_count || ' rows selected');
END get_values;
/

3. Call The Function Using SQL Query

Now finally, we can call the above function and can get the rows as desired:

select * from TABLE(get_values());

Output:

COLUMN_VALUE
LINE1
LINE2
LINE3
LINE4
LINE5
LINE6
LINE7
LINE8
LINE9
LINE10
10 rows of 20