Sql orgot删除括号。这对我有用。谢谢是否有方法引发异常，使其不检查userid=xxx位，而只检查禁用的\u til>yyy位？如果用户ID不存在，我的应用程序中会有不同的流。我只想根据禁用的值抛出异常。否则会发生正常的异常。@a_horse_，没有名字：

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orgot删除括号。这对我有用。谢谢是否有方法引发异常，使其不检查userid=xxx位，而只检查禁用的\u til>yyy位？如果用户ID不存在，我的应用程序中会有不同的流。我只想根据禁用的值抛出异常。否则会发生正常的异常。@a_horse_，没有名字：真的，谢谢。忘记去掉括号了。

If (select banned_till from users where userid = $1) = nil or < currentTime
   Insert in posts (col1, col2) values ('abc', 'xyz')
ELSE
   RAISE Exception "User is banned"
ENDIF

DO
$$
BEGIN
    IF (select banned_till from users where unqid = 'user01') < now() THEN
      RAISE EXCEPTION 'User is banned';
    ELSE
        insert into posts (unqid, title, link, content, author_id, author_nick, author_flair) 
            SELECT 'pid03', 'Sample post title', 'www.google.com', 'This is a sample Post Content', unqid, nickname, flair 
            from users where unqid = 'user01';
    END IF;
END
$$;

INSERT INTO posts (col1, col2) 
SELECT 'abc', 'xyz'
FROM   users
WHERE  userid = $1  -- assuming userid is UNIQUE
AND   (banned_till >= currentTime) IS NOT TRUE;

DO
$$
BEGIN
   INSERT INTO posts (col1, col2)
   SELECT 'abc', 'xyz'
   FROM   users
   WHERE  userid = $1
   AND   (banned_till >= currentTime) IS NOT TRUE;

   IF NOT FOUND THEN
      RAISE EXCEPTION 'User is banned';
   END IF;
END
$$;

with s as (
      select banned_till
      from users where userid = $1
     ),
     i as (
      insert into posts (col1, col2)
          select v.col1, v.col2
          from (values ('abc', 'xyz')) v(col1, col2)
          where (select coalesce(max(banned_till), current_date) from s) < now()
    )
select max( coalesce(max(banned_till), current_date) ) < current_time as is_success
from s;