Cursor expressions as arguments to functions called from SQL : REFCURSOR « Cursor « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. Cursor
3. REFCURSOR

SQL>
SQL>
SQL> create table product(
  2     product_id number(4)     not null,
  3     product_description varchar2(20) not null
  4  );

Table created.

SQL>
SQL> insert into product values (1,'Java');

1 row created.

SQL> insert into product values (2,'Oracle');

1 row created.

SQL> insert into product values (3,'C#');

1 row created.

SQL> insert into product values (4,'Javascript');

1 row created.

SQL> insert into product values (5,'Python');

1 row created.

SQL>
SQL>
SQL> create table company(
  2     product_id        number(4)    not null,
  3     company_id          NUMBER(8)    not null,
  4     company_short_name  varchar2(30) not null,
  5     company_long_name   varchar2(60)
  6  );

Table created.

SQL> insert into company values(1,1001,'A Inc.','Long Name A Inc.');

1 row created.

SQL> insert into company values(1,1002,'B Inc.','Long Name B Inc.');

1 row created.

SQL> insert into company values(1,1003,'C Inc.','Long Name C Inc.');

1 row created.

SQL> insert into company values(2,1004,'D Inc.','Long Name D Inc.');

1 row created.

SQL> insert into company values(2,1005,'E Inc.','Long Name E Inc.');

1 row created.

SQL> insert into company values(2,1006,'F Inc.','Long Name F Inc.');

1 row created.

SQL>
SQL>
SQL> create table org_company_site(
  2     company_id number(8) not null,
  3     site_no number(4) not null
  4  );

Table created.

SQL> insert into org_company_site values (1001,1);

1 row created.

SQL> insert into org_company_site values (1002,2);

1 row created.

SQL> insert into org_company_site values (1003,3);

1 row created.

SQL> insert into org_company_site values (1004,1);

1 row created.

SQL> insert into org_company_site values (1004,2);

1 row created.

SQL> insert into org_company_site values (1004,3);

1 row created.

SQL> insert into org_company_site values (1005,1);

1 row created.

SQL> insert into org_company_site values (1005,4);

1 row created.

SQL> insert into org_company_site values (1005,5);

1 row created.

SQL> insert into org_company_site values (1006,1);

1 row created.

SQL>
SQL>
SQL> CREATE OR REPLACE FUNCTION f_report(p_cursor SYS_REFCURSOR,p_title VARCHAR2)
  2  RETURN NUMBER
  3  IS
  4    v_product_description VARCHAR2(20);
  5    v_company_short_name VARCHAR2(30);
  6    v_ret_code NUMBER;
  7  BEGIN
  8    BEGIN
  9      dbms_output.put_line(p_title);
 10
 11      LOOP
 12        FETCH p_cursor INTO v_product_description,v_company_short_name;
 13        EXIT WHEN p_cursor%NOTFOUND;
 14        dbms_output.put_line(rpad(v_product_description,20,' ')||' '||
 15        rpad(v_company_short_name,30,' '));
 16      END LOOP;
 17      v_ret_code :=1;
 18    EXCEPTION WHEN OTHERS THEN
 19      v_ret_code :=SQLCODE;
 20    END;
 21    RETURN (v_ret_code);
 22  END;
 23  /

Function created.

SQL>
SQL>
SQL> SELECT 'Report Generated on '||TO_CHAR(SYSDATE,'MM/DD/YYYY ') "Report1"
  2  FROM DUAL
  3  WHERE f_report(
  4          CURSOR(SELECT h.product_description,o.company_short_name
  5                 FROM product h,company o
  6                 WHERE o.product_id =h.product_id
  7                 AND 1 < (SELECT count(os.site_no)
  8                          FROM org_company_site os
  9                          WHERE os.company_id =o.company_id)
 10                ),
 11          'List of Organizations located in more than one site'
 12  )=1;

Report1
-------------------------------
Report Generated on 07/24/2008

1 row selected.

List of Organizations located in more than one site
Oracle               D Inc.
Oracle               E Inc.
SQL>
SQL> drop table company;

Table dropped.

SQL>
SQL> drop table product;

Table dropped.

SQL>
SQL> drop table org_company_site;

Table dropped.

SQL>