Hibernate auto commit without any DAO request
I'm currently reading code from another guy. I saw that he doesn't make any explicit request to update DB but it does update the entity. Please check below pseudo code:
@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
public void updateFoo(long fooId) {
// Get foo instance from DB, foo has status = 0
Foo foo = fooDAO.getFoo(fooId);
foo.setStatus(1);
// There is no call to DAO layer from here
}
I checked from My SQL, foo is updated without any session.save(foo) or session.update(foo)
Normally, I would call some thing like this in FooDAO layer
sessionFactory.getCurrentSession().update(foo);
How's that possible? I suspect that the Transaction auto commit POJO Object. Please let me know how? And why would anyone do that, is this make code harder to read?
mysql spring hibernate spring-transactions
asked Nov 26 '18 at 8:24
nguyentaijsnguyentaijs
908
add a comment |
I'm currently reading code from another guy. I saw that he doesn't make any explicit request to update DB but it does update the entity. Please check below pseudo code:
@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
public void updateFoo(long fooId) {
// Get foo instance from DB, foo has status = 0
Foo foo = fooDAO.getFoo(fooId);
foo.setStatus(1);
// There is no call to DAO layer from here
}
I checked from My SQL, foo is updated without any session.save(foo) or session.update(foo)
Normally, I would call some thing like this in FooDAO layer
sessionFactory.getCurrentSession().update(foo);
How's that possible? I suspect that the Transaction auto commit POJO Object. Please let me know how? And why would anyone do that, is this make code harder to read?
mysql spring hibernate spring-transactions
asked Nov 26 '18 at 8:24
nguyentaijsnguyentaijs
908
2
That's the basic principle of JPA/Hibernate. Managed entities are... managed. Their state is persisted automatically. This is idiomatic JPA code. Calling save() or update() would just show that the author doesn't understand how JPA/Hibernate works.
– JB Nizet
Nov 26 '18 at 8:27
@JB Nizet: sorry for my lack of understanding, could you let me know: what's the point of callupdate()when it will be updated anyway
– nguyentaijs
Nov 26 '18 at 8:28
1
Just read the javadoc: Update the persistent instance with the identifier of the given detached instance. Detached instances, by definition, are not managed. So if you have a detached instance containing modifications, you can update the database by attaching it using the update() method.
– JB Nizet
Nov 26 '18 at 8:32
add a comment |
I'm currently reading code from another guy. I saw that he doesn't make any explicit request to update DB but it does update the entity. Please check below pseudo code:
@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
public void updateFoo(long fooId) {
// Get foo instance from DB, foo has status = 0
Foo foo = fooDAO.getFoo(fooId);
foo.setStatus(1);
// There is no call to DAO layer from here
}
I checked from My SQL, foo is updated without any session.save(foo) or session.update(foo)
Normally, I would call some thing like this in FooDAO layer
sessionFactory.getCurrentSession().update(foo);
How's that possible? I suspect that the Transaction auto commit POJO Object. Please let me know how? And why would anyone do that, is this make code harder to read?
mysql spring hibernate spring-transactions
asked Nov 26 '18 at 8:24
nguyentaijsnguyentaijs
908
I'm currently reading code from another guy. I saw that he doesn't make any explicit request to update DB but it does update the entity. Please check below pseudo code:
@Transactional(propagation = Propagation.REQUIRED, readOnly = false)
public void updateFoo(long fooId) {
// Get foo instance from DB, foo has status = 0
Foo foo = fooDAO.getFoo(fooId);
foo.setStatus(1);
// There is no call to DAO layer from here
}
I checked from My SQL, foo is updated without any session.save(foo) or session.update(foo)
Normally, I would call some thing like this in FooDAO layer
sessionFactory.getCurrentSession().update(foo);
How's that possible? I suspect that the Transaction auto commit POJO Object. Please let me know how? And why would anyone do that, is this make code harder to read?
mysql spring hibernate spring-transactions
mysql spring hibernate spring-transactions
asked Nov 26 '18 at 8:24
nguyentaijsnguyentaijs
908
asked Nov 26 '18 at 8:24
nguyentaijsnguyentaijs
908
asked Nov 26 '18 at 8:24
nguyentaijsnguyentaijs
908
asked Nov 26 '18 at 8:24
nguyentaijsnguyentaijs
908
asked Nov 26 '18 at 8:24
nguyentaijsnguyentaijs
908
908
2
That's the basic principle of JPA/Hibernate. Managed entities are... managed. Their state is persisted automatically. This is idiomatic JPA code. Calling save() or update() would just show that the author doesn't understand how JPA/Hibernate works.
– JB Nizet
Nov 26 '18 at 8:27
@JB Nizet: sorry for my lack of understanding, could you let me know: what's the point of callupdate()when it will be updated anyway
– nguyentaijs
Nov 26 '18 at 8:28
1
Just read the javadoc: Update the persistent instance with the identifier of the given detached instance. Detached instances, by definition, are not managed. So if you have a detached instance containing modifications, you can update the database by attaching it using the update() method.
– JB Nizet
Nov 26 '18 at 8:32
add a comment |
2
That's the basic principle of JPA/Hibernate. Managed entities are... managed. Their state is persisted automatically. This is idiomatic JPA code. Calling save() or update() would just show that the author doesn't understand how JPA/Hibernate works.
– JB Nizet
Nov 26 '18 at 8:27
@JB Nizet: sorry for my lack of understanding, could you let me know: what's the point of callupdate()when it will be updated anyway
– nguyentaijs
Nov 26 '18 at 8:28
1
Just read the javadoc: Update the persistent instance with the identifier of the given detached instance. Detached instances, by definition, are not managed. So if you have a detached instance containing modifications, you can update the database by attaching it using the update() method.
– JB Nizet
Nov 26 '18 at 8:32
2
2
That's the basic principle of JPA/Hibernate. Managed entities are... managed. Their state is persisted automatically. This is idiomatic JPA code. Calling save() or update() would just show that the author doesn't understand how JPA/Hibernate works.
– JB Nizet
Nov 26 '18 at 8:27
That's the basic principle of JPA/Hibernate. Managed entities are... managed. Their state is persisted automatically. This is idiomatic JPA code. Calling save() or update() would just show that the author doesn't understand how JPA/Hibernate works.
– JB Nizet
Nov 26 '18 at 8:27
@JB Nizet: sorry for my lack of understanding, could you let me know: what's the point of call
update() when it will be updated anyway– nguyentaijs
Nov 26 '18 at 8:28
@JB Nizet: sorry for my lack of understanding, could you let me know: what's the point of call
update() when it will be updated anyway– nguyentaijs
Nov 26 '18 at 8:28
1
1
Just read the javadoc: Update the persistent instance with the identifier of the given detached instance. Detached instances, by definition, are not managed. So if you have a detached instance containing modifications, you can update the database by attaching it using the update() method.
– JB Nizet
Nov 26 '18 at 8:32
Just read the javadoc: Update the persistent instance with the identifier of the given detached instance. Detached instances, by definition, are not managed. So if you have a detached instance containing modifications, you can update the database by attaching it using the update() method.
– JB Nizet
Nov 26 '18 at 8:32
add a comment |
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2
That's the basic principle of JPA/Hibernate. Managed entities are... managed. Their state is persisted automatically. This is idiomatic JPA code. Calling save() or update() would just show that the author doesn't understand how JPA/Hibernate works.
– JB Nizet
Nov 26 '18 at 8:27
@JB Nizet: sorry for my lack of understanding, could you let me know: what's the point of call
update()when it will be updated anyway– nguyentaijs
Nov 26 '18 at 8:28
1
Just read the javadoc: Update the persistent instance with the identifier of the given detached instance. Detached instances, by definition, are not managed. So if you have a detached instance containing modifications, you can update the database by attaching it using the update() method.
– JB Nizet
Nov 26 '18 at 8:32