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Oracle Object Types

Accessing stored objects

 test_id INTEGER,
 test_obj base_type,
 PRIMARY KEY (test_id)
INSERT INTO test_tab (test_id, test_obj)
VALUES (test_seq.NEXTVAL, base_type(1,'BASE_TYPE'));
INSERT INTO test_tab (test_id, test_obj)
VALUES (test_seq.NEXTVAL, base_type(2,'BASE_TYPE'));
INSERT INTO test_tab (test_id, test_obj)
VALUES (test_seq.NEXTVAL, mid_type(3, 'MID_TYPE',SYSDATE - 1));
INSERT INTO test_tab (test_id, test_obj)
VALUES (test_seq.NEXTVAL, mid_type(4, 'MID_TYPE',SYSDATE + 1));
INSERT INTO test_tab (test_id, test_obj)
VALUES (test_seq.NEXTVAL, leaf_type(5, 'LEAF_TYPE',SYSDATE - 20,'Maple'));
INSERT INTO test_tab (test_id, test_obj)
VALUES (test_seq.NEXTVAL, leaf_type(6, 'LEAF_TYPE',SYSDATE + 20,'Oak'));

Returns object reference:

SELECT test_id
 FROM test_tab;

Returns object reference, pushing all to subtype

SELECT test_id
 ,TREAT(test_obj AS mid_type) AS obj
 FROM test_tab;

Returns a string descriptor of each object, by type

SELECT test_id
 ,TREAT(test_obj AS base_type).to_string() AS to_string -- Parenthesis are needed after the
function name, or Oracle will look for an attribute of this name.
FROM test_tab;


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