如何将此函数/触发器从 postgres 迁移到 oracle？

Question

您好，我正在尝试迁移此 function 并触发，以便它可在 oracle 中使用，我有几个这样做只是寻找一些帮助，这样我就可以找出 Z65E8800B5C6800AADFCZ2966F 问题。 谢谢您的帮助。

CREATE FUNCTION podium_core.entity_tag_sync()
    RETURNS trigger
    LANGUAGE 'plpgsql'
    COST 100
    VOLATILE NOT LEAKPROOF 
AS $BODY$

BEGIN
insert into podium_core.pd_entity_tag(entity_nid,tag,version,modifiedby, createdby)
select distinct FOO.entity_nid, NEW.tag,0,'trigger','trigger' from
(select entity_nid from podium_core.pd_field where nid in (
select child_field_nid from podium_core.pd_field_pc_rel where parent_field_nid in 
(select max(f.nid) from podium_core.pd_field f join podium_core.pd_entity e on e.nid= f.entity_nid 
where entity_nid=NEW.entity_nid and entity_type='EXTERNAL')))FOO
where NEW.createdby <> 'trigger';
delete from podium_core.pd_entity_tag t1
USING podium_core.pd_entity_tag t2
WHERE t1.nid < t2.nid
AND t1.tag = t2.tag
AND t1.entity_nid = t2.entity_nid;

RETURN NEW;
END;

$BODY$;

ALTER FUNCTION podium_core.entity_tag_sync()
    OWNER TO postgres;

-- Trigger: trigger_entity_tag_sync
-- DROP TRIGGER trigger_entity_tag_sync ON podium_core.pd_entity_tag;

CREATE TRIGGER trigger_entity_tag_sync
    AFTER INSERT
    ON podium_core.pd_entity_tag
    FOR EACH ROW
    EXECUTE PROCEDURE podium_core.entity_tag_sync();

Answer 1

所以我刚刚重写了你的代码以匹配 Oracle 语法，但我怀疑它是否真的适合你——我认为它可能会引发“表正在变异”错误。 祝你好运。

CREATE OR REPLACE TRIGGER trigger_entity_tag_sync
AFTER INSERT ON podium_core.pd_entity_tag
FOR EACH ROW
BEGIN
    insert into podium_core.pd_entity_tag(entity_nid,tag,version,modifiedby, createdby)
    select distinct FOO.entity_nid, :NEW.tag,0,'trigger','trigger' 
    from
    (select entity_nid 
    from podium_core.pd_field 
    where nid in (
        select child_field_nid 
        from podium_core.pd_field_pc_rel 
        where parent_field_nid in 
            (select max(f.nid) from podium_core.pd_field f join podium_core.pd_entity e on e.nid= f.entity_nid 
            where entity_nid=:NEW.entity_nid and entity_type='EXTERNAL')
        )
    )FOO
    where :NEW.createdby <> 'trigger';

    delete from podium_core.pd_entity_tag t1
    where exists (select 1 from podium_core.pd_entity_tag t2
                    WHERE t1.nid < t2.nid
                    AND t1.tag = t2.tag
                    AND t1.entity_nid = t2.entity_nid);
END;
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