设置默认，对于未创建的表直接默认赋予只读权限
alter default privileges for user $db_owner in schema public grant select on tables to $read_only_user;
pubic这个schema是默认的schema
测试建表语句
create table t2 ( id serial, name varchar(64) );
pgsql 9.4修改数据库只读
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pgsql 9.4修改数据库只读
to $read_only_user;
grant select on all tables in schema public to $read_only_user;