\set tde_am tde_heap_basic
\i sql/change_access_method.inc
CREATE EXTENSION pg_tde;
SELECT pg_tde_add_key_provider_file('file-vault','/tmp/pg_tde_test_keyring.per');
 pg_tde_add_key_provider_file 
------------------------------
                            1
(1 row)

SELECT pg_tde_set_principal_key('test-db-principal-key','file-vault');
 pg_tde_set_principal_key 
--------------------------
 t
(1 row)

CREATE TABLE country_table (
     country_id        serial primary key,
     country_name    text unique not null,
     continent        text not null
) using :tde_am;
 
INSERT INTO country_table (country_name, continent)
     VALUES ('Japan', 'Asia'),
            ('UK', 'Europe'),
            ('USA', 'North America');
SELECT * FROM country_table;
 country_id | country_name |   continent   
------------+--------------+---------------
          1 | Japan        | Asia
          2 | UK           | Europe
          3 | USA          | North America
(3 rows)

SELECT pg_tde_is_encrypted('country_table');
 pg_tde_is_encrypted 
---------------------
 t
(1 row)

-- Try changing the encrypted table to an unencrypted table
ALTER TABLE country_table SET access method  heap;
-- Insert some more data 
INSERT INTO country_table (country_name, continent)
     VALUES ('France', 'Europe'),
            ('Germany', 'Europe'),
            ('Canada', 'North America');
SELECT * FROM country_table;
 country_id | country_name |   continent   
------------+--------------+---------------
          1 | Japan        | Asia
          2 | UK           | Europe
          3 | USA          | North America
          4 | France       | Europe
          5 | Germany      | Europe
          6 | Canada       | North America
(6 rows)

SELECT pg_tde_is_encrypted('country_table');
 pg_tde_is_encrypted 
---------------------
 f
(1 row)

-- Change it back to encrypted
ALTER TABLE country_table SET access method  :tde_am;
INSERT INTO country_table (country_name, continent)
     VALUES ('China', 'Asia'),
            ('Brazil', 'South America'),
            ('Australia', 'Oceania');
SELECT * FROM country_table;
 country_id | country_name |   continent   
------------+--------------+---------------
          1 | Japan        | Asia
          2 | UK           | Europe
          3 | USA          | North America
          4 | France       | Europe
          5 | Germany      | Europe
          6 | Canada       | North America
          7 | China        | Asia
          8 | Brazil       | South America
          9 | Australia    | Oceania
(9 rows)

SELECT pg_tde_is_encrypted('country_table');
 pg_tde_is_encrypted 
---------------------
 t
(1 row)

DROP TABLE country_table;
DROP EXTENSION pg_tde;