Friday, 13 April 2012

Hibernate Interview Questions and Answers - 11-20

11) Explain about mapping files in Hibernate?

Mapping files forms the core of any database mapping tools. These files contain field to field mapping, usually this mapping occurs between classes and attributes. After mapping files they can be persist to the database. Tags can be used to indicate the presence of a primary key.

12) What is the effect when a transient mapped object is passed onto a Sessions save?

When a ) is passed to a transient mapped object it makes the method to become more persistent. Garbage collection and termination of the Java virtual machine stays as long as it is deleted explicitly. It may head back to its transient state.

13) Explain about version field?

Application level data integrity constants are important if you are making changes to offline information which is again backed by database. Higher level locking or versioning protocol is required to support them. Version field usage comes at this stage but the design and implementation process is left to the developer.

14) State some advantages of hibernate?

Some of the advantages which a developer can get from Hibernate are as follows:
Mapping of one POJO table to one table is not required in hibernate.
It supports inheritance relationships and is generally a fast tool. Portability is necessary the greater benefit from hibernate. POJOs can be used in other applications where they are applicable.

15) Explain about addClass function?

This function translates a Java class name into file name. This translated file name is then loaded as an input stream from the Java class loader. This addclass function is important if you want efficient usage of classes in your code.

16) Explain about addjar() and addDirectory() methods?

These methods are the most convenient to use in hibernate. These methods allow you to load all your Hibernate documents at a time. These methods simplify code configuration, refactoring, layout, etc. These functions help you to add your hibernate mapping to Hibernate initialization files.

17) Explain about the id field?

This id field corresponds to the surrogate key which is generated by the database. These fields are handled by the id field. Name attribute is used to specify the names of the field and it should correspond to the method name of getid. This also should correspond to long type and the values should be stored I the database in the long column.

18) What are the most common methods of Hibernate configuration?

 The most common methods of Hibernate configuration are:
* Programmatic configuration
* XML configuration (hibernate.cfg.xml)

19) What are the important tags of hibernate.cfg.xml?

A) An Action Class is an adapter between the contents of an incoming HTTP rest and the corresponding business logic that should be executed to process this rest.

20) What are the Core interfaces are of Hibernate framework?

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The five core interfaces are used in just about every Hibernate application. Using these interfaces, you can store and retrieve persistent objects and control transactions.

* Session interface
* SessionFactory interface
* Transaction interface
* Query and Criteria interfaces


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