Oracle 11g Release 2

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CREATE TABLE DATA_TABLE(FIELD1         NUMBER,
                        FIELD2         VARCHAR2(100));
INSERT INTO DATA_TABLE (FIELD1, FIELD2)
  SELECT 1, 'ONE' FROM DUAL UNION ALL
  SELECT 1, 'TWO' FROM DUAL UNION ALL
  SELECT 2, 'THREE' FROM DUAL UNION ALL
  SELECT 2, 'FOUR' FROM DUAL UNION ALL
  SELECT 3, 'LAST' FROM DUAL;
5 rows affected

DECLARE
  TYPE typeCol IS TABLE OF DATA_TABLE%ROWTYPE;
  colVals        typeCol;
  strField_name  VARCHAR2(30) := 'FIELD1';
  nField_val     NUMBER := 2;
  
  strQuery       VARCHAR2(4000);
BEGIN
  strQuery := 'SELECT * FROM DATA_TABLE WHERE ' || strField_name || '=' || nField_val;
  
  DBMS_OUTPUT.PUT_LINE(strQuery);
  
  EXECUTE IMMEDIATE strQuery BULK COLLECT INTO colVals;
  
  FOR i IN colVals.FIRST..colVals.LAST LOOP
    DBMS_OUTPUT.PUT_LINE(i || ': FIELD1=' || colVals(i).FIELD1 || '  FIELD2=' || colVals(i).FIELD2);
  END LOOP;
END;
/
1 rows affected

dbms_output:
SELECT * FROM DATA_TABLE WHERE FIELD1=2
1: FIELD1=2  FIELD2=THREE
2: FIELD1=2  FIELD2=FOUR