postgresql 监控表的改动 添加log
需求是这样的, 尝试使用odoo开源系统, 但是需要对接自己的模块.
想偷个懒就直接改odoo的数据库了, 但是虽然能看到调拨记录, 不过却没有刷新记录个数, 导致在自己直接改数据库之后, 在odoo正常操作会导致key_id重复报错
想了两个解决办法, 第一是直接找odoo的源码, 找到插入时检查最新key_id的方法, 直接改了
不过看源码有点头疼
第二个就是希望直接监控数据库的改动, 把所有操作log出来, 然后在直接改数据库的补上漏掉的部分
搜了一下, 可以通过给每个表加触发器的方法实现
CREATE SCHEMA logging;
CREATE TABLE logging.t_history (
id serial,
tstamp timestamp DEFAULT now(),
schemaname text,
tabname text,
operation text,
who text DEFAULT current_user,
new_val json,
old_val json
);
--------------------------------------------------------
CREATE FUNCTION change_trigger() RETURNS trigger AS $$
BEGIN
IF TG_OP = 'INSERT'
THEN INSERT INTO logging.t_history (
tabname, schemaname, operation, new_val
) VALUES (
TG_RELNAME, TG_TABLE_SCHEMA, TG_OP, row_to_json(NEW)
);
RETURN NEW;
ELSIF TG_OP = 'UPDATE'
THEN
INSERT INTO logging.t_history (
tabname, schemaname, operation, new_val, old_val
)
VALUES (TG_RELNAME, TG_TABLE_SCHEMA, TG_OP, row_to_json(NEW), row_to_json(OLD));
RETURN NEW;
ELSIF TG_OP = 'DELETE'
THEN
INSERT INTO logging.t_history
(tabname, schemaname, operation, old_val)
VALUES (
TG_RELNAME, TG_TABLE_SCHEMA, TG_OP, row_to_json(OLD)
);
RETURN OLD;
END IF;
END;
$$ LANGUAGE 'plpgsql' SECURITY DEFINER;
-----------------------------------------------------
CREATE TRIGGER t BEFORE INSERT OR UPDATE OR DELETE ON 你的表名
FOR EACH ROW EXECUTE PROCEDURE change_trigger();
要给每个表都添加trigger, 可以先select到所有表名, 然后批量添加trigger
select relname as tabname,cast(obj_description(relfilenode,'pg_class') as varchar) as comment from pg_class c
where relkind = 'r' and relname not like 'pg_%' and relname not like 'sql_%' order by relname
最后可以看到效果:
参考链接:https://stackoverflow.com/questions/13785855/how-to-log-data-change-in-postgresql