PostgreSQL修改用户密码的多种方式

-- 修改当前用户密码
ALTER USER current_user WITH PASSWORD 'new_password';

-- 修改指定用户密码（需要权限）
ALTER USER username WITH PASSWORD 'new_password';

psql -U username -d database
\password username
# 会提示输入新密码两次

-- 以postgres用户登录后
sudo -u postgres psql
ALTER USER dbuser WITH PASSWORD 'new_secure_pass123';

psql -h 192.xxx.xxx.99 -U postgres -d postgres
# 输入当前密码后执行：
ALTER USER app_user WITH PASSWORD 'new_pass!456';

-- 设置密码有效期
ALTER USER username VALID UNTIL '2025-12-31';

-- 使密码永不过期
ALTER USER username VALID UNTIL 'infinity';

CREATE EXTENSION pgcrypto;
ALTER USER username WITH ENCRYPTED PASSWORD 'Complex@Pass123';

local   all   postgres   trust

-- 生成批量修改语句
SELECT 'ALTER USER '||usename||' WITH PASSWORD '''||
       substr(md5(random()::text), 0, 10)||''';'
FROM pg_user
WHERE usename NOT LIKE 'pg_%';

-- 检查密码最后修改时间（需pg_shadow权限）
SELECT usename, passwd FROM pg_shadow;

password_encryption = scram-sha-256

ERROR: must be superuser to alter superusers

-- 密码包含单引号时
ALTER USER test WITH PASSWORD $$don't_use_this$$;