How to display result of execute immediate on sql prompt

Question

I wish to create a dynamic select statement where i will give table name and where condition as input parameters at runtime. for this i created following procedure:
CREATE or replace PROCEDURE select_rows (
table_name IN VARCHAR2,
condition IN VARCHAR2 DEFAULT NULL)
AS
where_clause VARCHAR2(100) := ' WHERE ' || condition;
BEGIN
IF condition IS NULL THEN where_clause := NULL; END IF;
EXECUTE IMMEDIATE 'select * FROM ' || table_name || where_clause;
END;
my procedure is successfully created.
my problem is how to get select stmt output at screen (sql prompt)
or how to spool the output in a file.
plz. help me. I am learning oracle .
thanx in adv.
Mani

Answer 1

You could use refcursors. Example :
TEST@db102 > CREATE or replace PROCEDURE select_rows (
  2     table_name IN VARCHAR2,
  3     condition IN VARCHAR2 DEFAULT NULL,
  4     cur1 out sys_refcursor)
  5  AS
  6     where_clause VARCHAR2(100) := ' WHERE ' || condition;
  7  BEGIN
  8     IF condition IS NULL THEN where_clause := NULL; END IF;
  9     open cur1 for 'select * from '||table_name||where_clause;
10  END;
TEST@db102 > /
Procedure created.
TEST@db102 > var cur refcursor;
TEST@db102 > exec select_rows('emp','deptno=20',:cur);
PL/SQL procedure successfully completed.
TEST@db102 > print cur
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7788 SCOTT      ANALYST         7566 09-DEC-82       3000                    20
      7876 ADAMS      CLERK           7788 12-JAN-83       1100                    20
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
TEST@db102 >