如何检查何时创建Postgres触发器?

如果我理解的很好,你的问题是你想知道什么时候 代码 将更新触发器的,并捕获此信息。(例如在表格中)。对于之前的修改,PostgreSQL似乎不可能知道它。 但是,如果您对未来的修改感兴趣,那么您可以放置另一种类型的触发器:事件触发器。( https://www.postgresql.org/docs/current/event-triggers.html )

你可以这样做:

CREATE OR REPLACE FUNCTION [your_schema].ddl_trigger_alter_trigger_fct()
  RETURNS event_trigger
 LANGUAGE plpgsql
  AS $$
DECLARE
    all_variables character varying;
    r RECORD;
    schema_name varchar (250);
    command_tag varchar (100);
    object_type varchar (250);
BEGIN
    FOR r IN SELECT * FROM pg_event_trigger_ddl_commands() LOOP
        if r.schema_name = '[your_schema]' and r.command_tag = 'ALTER TRIGGER'
        then
            schema_name := r.schema_name;
            command_tag := r.command_tag;
            object_type := r.object_type;
            RAISE NOTICE 'caught % event on %', r.command_tag, r.object_identity;
            all_variables := concat(
                'classid: ', r.classid, chr(10)
                , 'objid: ', r.objid, chr(10)
                , 'objsubid: ', r.objsubid, chr(10)
                , 'command_tag: ', r.command_tag, chr(10)
                , 'object_type: ', r.object_type, chr(10)
                , 'schema_name: ', r.schema_name, chr(10)
                , 'object_identity: ', r.object_identity, chr(10)
                , 'in_extension: ', r.in_extension);

            RAISE NOTICE '%', all_variables;
        end if;
    END LOOP;

    if schema_name = '[your_schema]' and command_tag = 'ALTER TRIGGER'
    then
        -- Do what you want, for example insert a line in a table of logs
    end if;
END;
$$;

CREATE EVENT TRIGGER ddl_trigger_alter_trigger ON ddl_command_end WHEN TAG IN ('ALTER TRIGGER')
   EXECUTE FUNCTION [your_schema].ddl_trigger_alter_trigger_fct();

但是,如果您感兴趣的触发器调用了函数的代码,那么您只需要在alter函数事件上放置另一个事件触发器。

希望这有帮助;)

好吧,postgress触发器不会修改,它会修改您在执行特定操作的地方应用了trigger函数的属性值,比如, BEFROE UPDATE, BEFORE INSERT, AFTER UPDATE, AFTER INSERT