Comments (2)
Persistable
is a Spring Data API to determine the identifier and whether an object is new or not. Persistable
is only used by Spring Data modules in which we fully control the object lifecycle such as Elasticsearch.
JPA handles object lifecycles on its own with the concept of attached entities hence Spring Data JPA doesn't make use of Persistable
for inserts vs. updates, instead, what you already found, whether to call EntityManager.merge(…)
vs. EntityManager.persist(…)
.
Generally speaking, if you use a single cache (Cache.cacheMap.get(md5)
) for two persistence technologies, after associating the object with your cache, all related store modules will use the same outcome for isNew
.
Ideally, you use the md5 value as primary key if that is what you're looking for.
from spring-data-jpa.
Persistable
seem to be unuseful in spring data jpa
.All operations depend on whether id
has value.I can't imagine what can i do with Persistable
.I think spring data jpa
and spring data elasticsearch
,they all belong to spring data
,
they implements Persistable
,They should have the same behavior
- if
document
’sid
has value and isNew=true will throw exception, isNew=false willselect by id
andupdate
; - if
document
’sid
is null and isNew=true willinsert
,isNew=false wll alsoinsert
;
from spring-data-jpa.
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