EXECUTE IMMEDIATE option for Dynamic SQL and PL/SQL

1. To run a DDL statement in PL/SQL.

begin
execute immediate 'set role all';
end;

2. To pass values to a dynamic statement (USING clause).

declare
l_depnam varchar2(20) := 'testing';
l_loc varchar2(10) := 'Dubai';
begin
execute immediate 'insert into dept values (:1, :2, :3)'
using 50, l_depnam, l_loc;
commit;
end;

3. To retrieve values from a dynamic statement (INTO clause).

declare
l_cnt varchar2(20);
begin
execute immediate 'select count(1) from emp'
into l_cnt;
dbms_output.put_line(l_cnt);
end;

4. To call a routine dynamically: The bind variables used for parameters of the routine have to be specified along with the parameter type. IN type is the default, others have to be specified explicitly.

declare
l_routin varchar2(100) := 'gen2161.get_rowcnt';
l_tblnam varchar2(20) := 'emp';
l_cnt number;
l_status varchar2(200);
begin
execute immediate 'begin ' || l_routin || '(:2, :3, :4); end;'
using in l_tblnam, out l_cnt, in out l_status;
if l_status != 'OK' then
dbms_output.put_line('error');
end if;
end;

5. To return value into a PL/SQL record type: The same option can be used for %rowtype variables also.

declare
type empdtlrec is record (empno number(4),
ename varchar2(20),
deptno number(2));
empdtl empdtlrec;
begin
execute immediate 'select empno, ename, deptno ' ||
'from emp where empno = 7934'
into empdtl;
end;

6. To pass and retrieve values: The INTO clause should precede the USING clause.

declare
l_dept pls_integer := 20;
l_nam varchar2(20);
l_loc varchar2(20);
begin
execute immediate 'select dname, loc from dept where deptno = :1'
into l_nam, l_loc
using l_dept ;
end;

7. Multi-row query option. Use the insert statement to populate a temp table for this option. Use the temporary table to carry out further processing. Alternatively, you may use REF cursors to by-pass this drawback.

declare
l_sal pls_integer := 2000;
begin
execute immediate 'insert into temp(empno, ename) ' ||
' select empno, ename from emp ' ||
' where sal > :1'
using l_sal;
commit;
end;