问题
I have many EntityManager, one per schema that I have (I use entity-mappings file to map EMs with schemas). It works.
When I use @NamedQuery it's working like a charm but when I use @NamedNativeQuery schema is not used. I have to qualify with it SELECT foo FROM schema.table.
Is it the right behaviour ?
I think it's not possible to parameter @NamedNativeQuery to dynamically pass schema (I believe only columns can be dynamics not tables or schemas or anything else) so how can I use @NamedNativeQuery with dynamic schema please ?
回答1:
Excerpts from documentation :
- NamedNativeQuery : Specifies a named native SQL query. Query names are scoped to the persistence unit.
- NamedQuery : Specifies a static, named query in the Java Persistence query language. Query names are scoped to the persistence unit.
It isn't specified directly that NamedNativeQuery is static, but both are same scoped & can't be altered afterwards & it's the desired behaviour.
Named queries are mean to be accessed by multiple modules - application wide, identified by unique name, so they are static & constant. You can try building a query string dynamically & can create a native query from it, instead of named native query.
回答2:
Prefix your table name with "{h-schema}", e.g.SELECT foo FROM {h-schema}table
(courtesy of getting hibernate default schema name programmatically from session factory?)
来源：https://stackoverflow.com/questions/13961855/manage-namednativequery-and-schema