SQL> declare
  2    v1 number(2);
  3    v2 number(2);
  4    lCmd varchar2(200);
  5  begin
  6    v2:= 10;
  7    lCmd := 'begin :v1 := :v2; end;';
  8    execute immediate lcmd using out v1, in v2;
  9    dbms_output.put_line('v1='||v1);
 10  end;
 11  /
v1=10

PL/SQL procedure successfully completed.

sqlString := '
    BEGIN
        :var := pRec.' || pField || ';
    END;
';
EXECUTE IMMEDIATE sqlString USING IN OUT myVar;

SCOTT@10gXE> CREATE TABLE t1
  2    (f1 NUMBER (10) PRIMARY KEY,
  3  	f2 CHAR   ( 2),
  4  	f3 CHAR   ( 2),
  5  	f4 CHAR   ( 2),
  6  	f5 CHAR   ( 2))
  7  /

Table created.

SCOTT@10gXE> BEGIN
  2    INSERT INTO t1 VALUES (1, 'a1', 'b1', 'c1', 'd1');
  3    INSERT INTO t1 VALUES (2, 'a2', 'b2', 'c2', 'd2');
  4    INSERT INTO t1 VALUES (3, 'a3', 'b3', 'c3', 'd3');
  5    INSERT INTO t1 VALUES (4, 'a4', 'b4', 'c4', 'd4');
  6    INSERT INTO t1 VALUES (5, 'a5', 'b5', 'c5', 'd5');
  7  END;
  8  /

PL/SQL procedure successfully completed.

SCOTT@10gXE> CREATE OR REPLACE TYPE t1_typ AS OBJECT
  2    (f1 NUMBER (10),
  3  	f2 CHAR   ( 2),
  4  	f3 CHAR   ( 2),
  5  	f4 CHAR   ( 2),
  6  	f5 CHAR   ( 2))
  7  /

Type created.

SCOTT@10gXE> CREATE OR REPLACE TYPE t1_tab AS TABLE OF t1_typ;
  2  /

Type created.

SCOTT@10gXE> CREATE OR REPLACE FUNCTION getValue
  2    (p_rect1  t1_typ,
  3  	p_Field  VARCHAR2)
  4    RETURN CHAR
  5  AS
  6    v_rect1	      t1_tab := t1_tab();
  7    v_Command      VARCHAR2 (200);
  8    v_returnValue  CHAR     (  2);
  9  BEGIN
 10    v_rect1.EXTEND;
 11    v_rect1(v_rect1.COUNT) := p_rect1;
 12    v_Command := 'SELECT t.' || p_field || ' FROM TABLE (:b_rect1) t';
 13    EXECUTE IMMEDIATE v_Command INTO v_returnValue USING v_rect1;
 14    RETURN v_returnValue;
 15  END getValue;
 16  /

Function created.

SCOTT@10gXE> SHOW ERRORS
No errors.
SCOTT@10gXE> CREATE OR REPLACE FUNCTION test_getValue
  2    (p_f1	IN NUMBER,
  3  	p_field IN VARCHAR2)
  4    RETURN CHAR
  5  AS
  6    v_rect1	    t1_tab := t1_tab();
  7    v_returnval  CHAR (2);
  8  BEGIN
  9    FOR r IN (SELECT * FROM t1 WHERE f1 = p_f1) LOOP
 10  	 v_rect1.EXTEND;
 11  	 v_rect1(v_rect1.COUNT) := t1_typ (r.f1, r.f2, r.f3, r.f4, r.f5);
 12    END LOOP;
 13    v_returnval := getValue (v_rect1(1), p_field);
 14    RETURN v_returnval;
 15  END test_getValue;
 16  /

Function created.

SCOTT@10gXE> SHOW ERRORS
No errors.
SCOTT@10gXE> COLUMN get_f2 FORMAT A6
SCOTT@10gXE> COLUMN get_f3 FORMAT A6
SCOTT@10gXE> COLUMN get_f4 FORMAT A6
SCOTT@10gXE> COLUMN get_f5 FORMAT A6
SCOTT@10gXE> SELECT f1,
  2  	    test_getvalue (f1, 'f2') AS get_f2,
  3  	    test_getvalue (f1, 'f3') AS get_f3,
  4  	    test_getvalue (f1, 'f4') AS get_f4,
  5  	    test_getvalue (f1, 'f5') AS get_f5
  6  FROM   t1
  7  /

        F1 GET_F2 GET_F3 GET_F4 GET_F5
---------- ------ ------ ------ ------
         1 a1     b1     c1     d1
         2 a2     b2     c2     d2
         3 a3     b3     c3     d3
         4 a4     b4     c4     d4
         5 a5     b5     c5     d5

SCOTT@10gXE>