Difference Between Hibernate Save And Persist Methods
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Hibernate »
On Sep 13, 2011 | { 8 Comments }
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Actually the difference between hibernate save() and persist() methods is depends on generator class we are using.
- If our generator class is assigned, then there is no difference between save() and persist() methods. Because generator ‘assigned’ means, as a programmer we need to give the primary key value to save in the database right [ Hope you know this generators concept ]
- In case of other than assigned generator class, suppose if our generator class name is Increment means hibernate it self will assign the primary key id value into the database right [ other than assigned generator, hibernate only used to take care the primary key id value remember
], so in this case if we call save() or persist() method then it will insert the record into the database normally
But hear thing is, save() method can return that primary key id value which is generated by hibernate and we can see it by
long s = session.save(k);
In this same case, persist() will never give any value back to the client, hope you are clear.
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8 Responses to “Difference Between Hibernate Save And Persist Methods”
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Please post your questions on Java4s Answers forum
Hello java4s,
Please provide the concepts of lazy loading and where it is used in real time applications.
Thanks in advance.
@Vaseem
Sure,i do accept !
Actually we ignored few topics, which are very important in the interview point of view.
We noted this for an update, thank you.
I just checked session.save() method is not returning any primary key.
I think the difference lies with rest to transaction context.
@kand
Its depends on the generator we are using, it wont gives any return value back to assigned.
- Comment edited (Reason : corrected)
Hello sir,
what is difference between load() &get() in hibernate?
@suresh:
load is the lazy function
when doing emp e1 = session.load()… query doesnt happen .. it happen only when get the value ie. emp.getName();
but in session.get().. query happens that time itself..
Hello Sir,
Thanks for the info provided.
If you perform save and persist for the same object at same time (one after the another) only one object is saved into the DB.
For e.g. : Person p = new Person();
p.setName(“dfdfd”);
session.save(p);
session.persist(p);
Superb example I just danced with joy after reading the example. You have cleared the point. this example is direct hit to the target like bullet fired at correct target with sniper gun not like typical example stuffs that says bluh bluh bluh bluh bluh and bluh… and got just confused.