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POJOs
What are POJOs?How POJOs are created & used in Hibernate?
bhaskar daggupati
- Nov 7th, 2017
POJO class did happened in Hibernate...when we are doing reverse engineering to the project at that time it will be happened. POJO class will be used setters nd getters to insert or retrive the data.
Thomas John
- Sep 21st, 2015
A Java Bean is a Java class that has getters and setters in order to conform to Java-bean standards. Essentially you declare properties private and use getters and setters to read or modify the data. ...
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Why we are using Hibernate?
why we are using Hibernate instead of JDBC where JDBC is less time taking than Hibernate?
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Hibernate DataSource Properties
What are the properties in DataSource Explain? also explain hibernate properties?
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What is component mapping in hibernate?
Thomas John
- Sep 21st, 2015
Hibernate component represents as a group of values or properties, not entity (table). I have a customer table that has address fields. I will create 2 models - customer, address. In this case, Addres...
mani.sivapuram
- Feb 21st, 2011
I will explain one realtime scenario here.Consider one Address class as given belowpublic class Address{private Integer doorNo;private String street;//provide setters and getters for above properties}...
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What is the difference between and merge and update
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promisingram- Member Since Oct-2008 | Oct 19th, 2008
Use update() if you are sure that the session does not contain an already persistent instance with the same identifier, and merge() if you want to merge your modifications at any time without consideration of the state of the session. In other words, update() is usually the first method you would call in a fresh session, ensuring that reattachment of your detached instances is the first operation that is executed.
Thomas John
- Sep 21st, 2015
I create an object say Employee with id 1. I create this object by getting the student record from the database. Object s1 is in the session Employee e1 = null; Object o = session1.get(Employee.cl...
Mukesh Vishwakarma
- Aug 25th, 2015
Update will work at same session. After close the session or detached the state, update will not work.
But in the case of Merge after closed the session it will work. -
Store images using Hibernate
How do you store a image in oracle using hibernate ?
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When would you use Hibernate and Spring JDBC Template ?
Mukesh
- Aug 25th, 2015
As per my view Hibernate is complete framework for ORM tool which including broad future for handing database. It has also keeping feature of Mapping (1 to 1, 1 to M,.....) but in Spring JDBC not covered to these all things
sampra
- Mar 19th, 2012
Spring jdbc and hibernate are working in same way ..it depends what technologies we are using
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What is the use of cascade in hbm file?
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anupsadhwani60- Member Since Sep-2007 | Sep 16th, 2007
1) cascade="none", the default, tells Hibernate to ignore the association.
2) cascade="save-update" tells Hibernate to navigate the association when the
transaction is committed and when an object is passed to save() or
update() and save newly instantiated transient instances and persist changes to
detached instances.
3) cascade="delete" tells Hibernate to navigate the association and delete persistent
instances when an object is passed to delete().
4) cascade="all" means to cascade both save-update and delete, as well as
calls to evict and lock.
5) cascade="all-delete-orphan" means the same as cascade="all" but, in addition,
Hibernate deletes any persistent entity instance that has been removed
(dereferenced) from the association (for example, from a collection).
6) cascade="delete-orphan" Hibernate will delete any persistent entity
instance that has been removed (dereferenced) from the association (for
example, from a collection).venkat
- Jan 22nd, 2013
Using cascade property we can ensure relationship with parent to child
harikishanrao
- Dec 1st, 2010
Whenever we have a parent child relation ship, if parent record is changed then child record should also be changed. Primary key must be reflected in the child key
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Hibernate JDBC Driver
What type of JDBC driver is used in hibernate?
nabi_alam
- Mar 30th, 2012
It depends on the Database what we are using.According to the database we use corresponding Driver.
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Q1: What is the difference between Hibernate and EJB 2.1? Q2: Which one, among EJB 2.1 and Hibernate, is better?Explain with reason.Q3: When to use EJB 2.1 and when to use Hibernate? Explain with scenarios.
srinivasaraobora
- Sep 20th, 2011
Advantages of Hibernate Over EJB Entity bean is also used for object oriented view. It needs lot of things to configure for make it possible and Lot of coding need for it. After all these performance ...
sony v george
- Apr 4th, 2007
Basically Ejb and Hibenate is enterly different one But having realtion with Entitybean in Ejb and Hibernate. Entity bean is also used for object orientd view . It need lot things to configures fo mak...
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How do we create new table apart from mapping with existing table ?
CrackHead
- Aug 8th, 2011
Hibernate automatically creates new tables if there are corresponding POJOs. If you know how to write/read to/from an existing table using Hibernate, then you can easily create a table. Step#1: Creat...
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What is database persistence?How well it is implemented in Hibernate
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mani.sivapuram- Member Since May-2010 | Feb 14th, 2011
There are mainly three states in hibernate
a) Transient state
b) Persistant state
c) Detatched stateTake the employee object place the data in that object like usename, password, empid. Now the state of the object is transient state, when we write the statement given below
session.save(employeeObject);
Now the state of the object is persistent since the employee object is kept in session object then when we write the statement given below
transaction.commit();
When we apply the above statement then the employee object is going to linked with database and the data is stored in related table of that database. Since the emp object in persistent state only the data is stored in database other wise the data is not stored in database.
After the commit operation it becomes into detached state. If anybody wants to store the emp object into database then in detached state it is not possible.
mani.sivapuram
- Feb 14th, 2011
There are mainly three states in hibernate a) Transient state b) Persistant state c) Detatched state Take the employee object place the data in that object like usename, password, empid. Now th...
prasadkuppa
- Apr 24th, 2008
Preserving the data inside a database is database persistence. Persistence is once of the fundamental concepts of application developement. There are many alternatives to implement persistence. Object...
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What is the advantage of Hibernate over jdbc?
Ballu Ashok
- Jan 21st, 2010
Hibernate Advantages:Productivity: Improves the productivity by eliminating the JDBC tedious code. ...
imam.tunduru
- Sep 9th, 2009
Advantages OF Hibernate: - First of all will provide business entity form of representation of DB tables. - Hibernate provides an interface to develop our application code which is not specific to an...
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How JPA and hibernate are related as per EJB 3 specifications?
krishna_kanth83
- May 29th, 2008
first things first ..i have just seen ppl venting thier personal grudge over java / jpa or whatever over this forum.suns official sacceptence that jpa is a failure. please lets keep it out.as for the ...
Sri
- Oct 12th, 2007
JPA is official acceptance from SUN about its failure on EJB. It has to abandon its EJB model to go to ORM model. Finally, Sun should provide developers some tools to migrate Java programs to .net easily with out pain
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Why do you need ORM tools like hibernate?
mani.sivapuram
- Feb 14th, 2011
since we want to reduce burden on the developer so for big projects if any maintaince is requered then problem finding and bug fixing is easy in case of hibernate.I can obey with one thing it we need ...
meetaskjain
- Mar 8th, 2010
Hibernate allows the application developer to concentrate on the business logic instead of writing complex SQLs. Aprt from this hibernate would take care of the database connections and managing conne...
Hibernate Interview Questions
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