### 筆記-psql create role and assign user to the role with read only permission

2018-03-25 筆記 Eric Chang

最後有成功，所以先把過程記錄下來，再來研究該怎麼下指令。

#### 建立一個 role 叫 dbreader

    postgres=# CREATE ROLE dbreader;

    CREATE ROLE

#### 讓dbreader這個 role 可以讀取 public 這個 schema 的{usage | select}

    postgres=# GRANT USAGE ON SCHEMA public TO dbreader;

    GRANT

    postgres=# GRANT SELECT ON ALL TABLES IN SCHEMA public TO dbreader;

    GRANT

#### 設定public schema 的default 權限 給 dbreader 這個 role

    postgres=# ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO dbreader;

    ALTER DEFAULT PRIVILEGES

#### 建立資料庫使用者 readuser

    postgres=# CREATE USER readuser WITH PASSWORD 'readuserpassword';

    CREATE ROLE

#### 將dbreader這個role 指定給 readuser

    postgres=# GRANT dbreader TO readuser;

    GRANT ROLE

##### 切到 neo DB

    postgres=# \q

    postgres@hqs022:~$ psql --u postgres  neo

    psql (9.6.8)

    Type "help" for help.

    neo=# GRANT SELECT ON ALL TABLES IN SCHEMA public to readuser;

    GRANT

    neo=# GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO readuser;

    GRANT

    neo=# GRANT ALL PRIVILEGES ON ALL FUNCTIONS IN SCHEMA public TO readuser;

    GRANT

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