pg用户角色密码默认使用md5加密

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postgres9.6@[local]:5432 postgres# create role r_test unencrypted password 'hello123' login;
CREATE ROLE
Time: 2.422 ms
postgres9.6@[local]:5432 postgres# select * from pg_shadow
;
usename | usesysid | usecreatedb | usesuper | userepl | usebypassrls | passwd | valuntil | useconfig
-------------+----------+-------------+----------+---------+--------------+-------------------------------------+----------+-----------
b | 16389 | f | f | f | f | md583aeaa4e529325e234e9c5c2e01e6c08 | NULL | NULL
test | 16385 | f | f | f | f | md505a671c66aefea124cc08b76ea6d30bb | NULL | NULL
a | 16388 | f | f | f | f | md5039af99d1e9a4b194e0eb800a6f8d018 | NULL | NULL
postgres9.6 | 10 | t | t | t | t | md5ad3e154e45b3eee89b51fdf2e60dafc6 | NULL | NULL
r_test | 32788 | f | f | f | f | hello123 | NULL | NULL
(5 rows)

Time: 0.767 ms
postgres9.6@[local]:5432 postgres# create role c login password 'cccccc';
CREATE ROLE
Time: 3.847 ms
postgres9.6@[local]:5432 postgres# select * from pg_shadow
;
usename | usesysid | usecreatedb | usesuper | userepl | usebypassrls | passwd | valuntil | useconfig
-------------+----------+-------------+----------+---------+--------------+-------------------------------------+----------+-----------
b | 16389 | f | f | f | f | md583aeaa4e529325e234e9c5c2e01e6c08 | NULL | NULL
test | 16385 | f | f | f | f | md505a671c66aefea124cc08b76ea6d30bb | NULL | NULL
a | 16388 | f | f | f | f | md5039af99d1e9a4b194e0eb800a6f8d018 | NULL | NULL
postgres9.6 | 10 | t | t | t | t | md5ad3e154e45b3eee89b51fdf2e60dafc6 | NULL | NULL
r_test | 32788 | f | f | f | f | hello123 | NULL | NULL
c | 32789 | f | f | f | f | md5e24b312f819219ec10b8b391a44d4974 | NULL | NULL
(6 rows)

Time: 0.824 ms
postgres9.6@[local]:5432 postgres# select md5('ccccccc'); -->括号中格式为“密码+用户名”
md5
----------------------------------
e24b312f819219ec10b8b391a44d4974
(1 row)

Time: 0.276 ms

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