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postgresql - Docker 上的 Postgres - 超出堆栈深度限制

问题描述

我在本地 Docker 上安装了 Postgres（最新版本）：

码头工人撰写：

version: '3.1'
services:
  postgres:
    image: postgres
    restart: always
    ports:
      - 5435:5432
    environment:
      POSTGRES_PASSWORD: xxxxxxx
    volumes:
      - pgdata:/var/lib/postgresql/data
      - ./init.sql:/docker-entrypoint-initdb.d/init.sql
    command:
      - "postgres"
      - "-c"
      - "max_stack_depth=7680"

volumes:
  pgdata:
networks:
  network1:

我的桌子：

create TABLE dictionary.language (
  id bigserial NOT NULL PRIMARY KEY,
  lang_name text NOT NULL
);

create TABLE dictionary.level (
  id bigserial NOT NULL PRIMARY KEY,
  level smallint NOT NULL
);

create TABLE dictionary.word (
  id bigserial NOT NULL PRIMARY KEY,
  name text,
  translation text,
  language_abbr_id bigint references language(id),
  level_id smallint references level(id),
  last_reviewed TIMESTAMP not null DEFAULT clock_timestamp()
);


create TABLE dictionary.examples (
   id bigserial NOT NULL PRIMARY KEY,
   sentence text NOT NULL,
   translation text NOT NULL,
   word_id bigint references word(id)
   );

create TABLE dictionary.user (
  id bigserial NOT NULL PRIMARY KEY,
  username text NOT NULL,
  password text NOT NULL
);

  CREATE OR REPLACE FUNCTION dictionary.set_last_reviewed()
  RETURNS trigger as
  $$
BEGIN
         INSERT INTO dictionary.word(last_reviewed)
         VALUES(now());

    RETURN NEW;
END;
$$
LANGUAGE 'plpgsql';



create trigger updateLastReviewedAfterUpdate
before update on dictionary.word
for each row
execute procedure dictionary.set_last_reviewed();

create trigger updateLastReviewedAfterInsert
before insert on dictionary.word
for each row
execute procedure dictionary.set_last_reviewed();

我想在我的表中插入一些东西：

insert into word(id,name,translation,language_abbr_id,level,last_reviewed) values(1,'fabulous', 'bajeczny, fantastyczny'    ,   1   ,   6   ,   '11/09/2018 23:58'  );

然后我得到错误：

查询执行失败

原因：SQL 错误 [54001]: ERROR: stack depth limit exceeded 提示：在确保平台的堆栈深度限制足够之后，增加配置参数“max_stack_depth”（当前为 7680kB）。其中：SQL 语句“INSERT INTO dictionary.word(last_reviewed)

     VALUES(now())" PL/pgSQL function set_last_reviewed() line 3 at SQL statement SQL statement "INSERT INTO

字典.word(last_reviewed)

     VALUES(now())" PL/pgSQL function set_last_reviewed() line 3 at SQL statement SQL statement "INSERT INTO

字典.word(last_reviewed)

     VALUES(now())" PL/pgSQL function set_last_reviewed() line 3 at SQL statement SQL statement "INSERT INTO

字典.word(last_reviewed)

     VALUES(now())" PL/pgSQL function set_last_reviewed() line 3 at SQL statement SQL statement "INSERT INTO

字典.word(last_reviewed)

     VALUES(now())" PL/pgSQL function set_last_reviewed() line 3 at SQL statement ...

它可能与我的触发器有关吗？我不知道如何解决我的问题

标签： postgresqldatabase-trigger

解决方案

您的插入触发器向表word中插入一个新行，这反过来又触发插入触发器，它插入一个新行来触发触发器......等等。

据我所知，您只是想为该列设置一个默认值。

您可以通过更改触发器处理的记录来执行此操作，而不是通过在表中插入一个全新的行：

只需将触发器更改为：

CREATE OR REPLACE FUNCTION dictionary.set_last_reviewed()
  RETURNS trigger as
$$
BEGIN
  new.last_reviewed := now();
  RETURN NEW;
END;
$$
LANGUAGE plpgsql;

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