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What are the types of inheritence models and describe how they work like vertical inheritence and horizontal
AjaySinghBhati
- Apr 30th, 2010
There are three types of inheritance mapping in hibernate1. Table per class hierarchy2. Table per subclass3. Table per concrete class In hbm.xml file you need following enteries1. For T...
Jaleel Akbar
- Jul 12th, 2007
Table per concrete class using implicitpolymorphism can also be added as inheritance mapping in hibernate
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What is different between Hibernate and iBatis?
uday.dandu
- Jul 27th, 2010
In iBatis Java objects are mapped to the result sets. IBatis only maps the Java bean properties to database fields, and it fetches the database results in the form of Java beans based on configur...
dhandabani.j
- Jan 22nd, 2009
These are the few questions that continuously get asked in most of forums. Whats really difference between two and really more importantly when should I use one over the other. Its pretty intere...
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Fetching Strategies
What are different fetching strategies in hibernate?
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Level 2 Cache and Query Cache
What will happened if level 2 cache is enable and query cache is diabled in Hibernate?
sowdri
- Jan 29th, 2011
Query cache depends on L2 cache. L2 cache does not depend on query cache. So nothing would happen. Alternatively: What will happened if level 2 cache is disabled and query cache is enabled in ...
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Execute Stored procedure in Hibernate
How to invoke a stored procedure in Hibernate and pass in a parameter?I have { ? = call myservice.TEST_PROC3( ? ) }While I can get stored proc output if there is no input to TEST_PROC3, e.g. call myservice.TEST_PROC3( )I don't know how to code in Java to pass in the parameter required in my case with:call myservice.TEST_PROC3( ? )Can anyone show me how to make such call in Java?Thanks
LendingHand
- Jun 3rd, 2008
You can declare it as Named queiries in one of your mapping files and give unique name.Call it in your code. Sample code is below.SQLQuery sq = (SQLQuery) session.getNamedQuery("findSearchResults...
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What is lazy fetching in hibernate
mani.sivapuram
- Feb 14th, 2011
Lazy fetching means for example in hibernate if we use load() method then load() is lazy fetching i.e it is not going to touch the database until we write empobject.getString("eno");So when we write a...
Karuna Reddy
- Aug 22nd, 2008
Lazy loading is the responsibility is that to load the objects for its parentIn mapping file, if
you want to load the child objects while loading the parent it will wont load coz by default load = trueso
you have to specify lazy = falsehere child class become parent while loading the objects. -
I am using hibernate.What is the use In Data(POJO) class primary key is sending as an argument with constructor?
mani.sivapuram
- Feb 14th, 2011
since according to the hibernate specifications hbm file is configured in such a way that one primary key shoud be configured in id tag of hbm file.and other properties are configured in property tags...
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What J2EE design problems does Hibernate solves apart from Data Base in-dependency and being an ORM tool?
mani.sivapuram
- Feb 14th, 2011
Since in case of jdbc autocommit is always true but in case of hibernate after executing all the sql statements only it process the commit operation this is called as transaction management.But this t...
prashant82
- Jun 24th, 2009
In hibernate objects are loosely coupled providing flexibility during integration with other databases or applicationsIn J2EE inheritance can not be achieved directly for the objects mapping One-to-one mapping is mandatory in J2EE
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What is Hibernate proxy?
arindam_0006in
- May 19th, 2008
Proxies are created dynamically by subclassing your object at runtime. The subclass has all the methods of the parent, and when any of the methods are accessed, the proxy loads up the real object from...
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What is the difference between hibernate and Spring
mani.sivapuram
- Feb 21st, 2011
Hibernate is used to interact with database.i.e if we want to save some data then we use hibernate or jdbc or some other tools available in the market.But it is not possible for struts or spring to st...
srini
- May 3rd, 2007
Hibernate is ORM tool used for data persistency.Spring is a framework for enterprise applications?with default APIs for presentation, middle tiers and presistence layers and allows to integrate with ...
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Hibernate error
org.hibernate.HibernateException: could not instantiate QueryTranslatorFactory: org.hibernate.hql.classic.ClassicQueryTransactionFactory at org.hibernate.cfg.SettingsFactory.createQueryTranslatorFactory(SettingsFactory.java:391) at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:222) at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292) at...
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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...
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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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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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What is database persistence?How well it is implemented in Hibernate
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Editorial / Best Answer
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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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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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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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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Hibernate Interview Questions
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