在 pgAdmin 4 中创建触发器函数

Question

我正在尝试使用 pgAdmin 4 在 PostgreSQL 数据库中创建一个触发器函数。该函数应该执行 pg_notify 和 return 在 JSON 中新插入的数据。但是我遇到了错误，无法弄清楚哪里出错了。

代码：

CREATE FUNCTION ba_weather.weather_notify_func()
  RETURNS trigger
  LANGUAGE 'plpgsql'
  NOT LEAKPROOF
AS $BODY$ CREATE OR REPLACE FUNCTION weather_notify_func()
 RETURNS TRIGGER
 LANGUAGE plpgsql
 AS $$
 BEGIN
    PERFORM pg_notify('weather_insert', row_to_json(NEW));
    RETURN NEW;
 END;
 $$;$BODY$;

ALTER FUNCTION ba_weather.weather_notify_func()
   OWNER TO me;

错误：

enter code here
ERROR: syntax error at or near "CREATE"
LINE 5: AS $BODY$ CREATE OR REPLACE FUNCTION weather_notify_func()
^

解决方法是：

CREATE FUNCTION ba_weather.weather_notify_func()
  RETURNS trigger
  LANGUAGE 'plpgsql'
  NOT LEAKPROOF
AS $BODY$ 
 BEGIN
    PERFORM pg_notify('weather_insert', row_to_json(NEW));
    RETURN NEW;
 END;
 $BODY$;

ALTER FUNCTION ba_weather.weather_notify_func()
   OWNER TO me;

Answer 1

您将函数定义再次嵌套到创建函数语句中：

CREATE FUNCTION ba_weather.weather_notify_func()
  RETURNS trigger
  LANGUAGE plpgsql
  NOT LEAKPROOF
AS $BODY$ 
BEGIN
  PERFORM pg_notify('weather_insert', row_to_json(NEW));
  RETURN NEW;
END;
$BODY$;

ALTER FUNCTION ba_weather.weather_notify_func()
   OWNER TO me;

在 pgAdmin 4 中创建触发器函数

Creating Trigger function in pgAdmin 4

postgresql

plpgsql

database-trigger

pgadmin-4