Table of Contents
- 1 Introduction
- 1.1 Question 1: Describe Hibernate.
- 1.2 Question 2: What is ‘ORM’?
- 1.3 Question 3: Name a few Hibernate benefits.
- 1.4 Question 4: What is the syntax to create a SQL query?
- 1.5 Question 5: Define ‘dialect’.
- 1.6 Question 6: Where are the mapping documents located within the framework?
- 1.7 Question 7: Name three of the main components of Hibernate.
- 1.8 Question 8: What is a ‘Hibernate Session’?
- 1.9 Question 9: How can you configure Hibernate?
- 1.10 Question 10: What’s the syntax of adding a criterion into the SQL query?
- 2 Hibernate Interview Questions: Advanced
- 2.1 Question 1: Name some of the advantages that Hibernate has over JDBC.
- 2.2 Question 2: What is ‘SessionFactory’?
- 2.3 Question 3: What is the purpose of ‘caching’ in Hibernate?
- 2.4 Question 4: Should you use POJOs in Hibernate?
- 2.5 Question 5: Explain ‘persistent classes’ in Hibernate.
- 2.6 Question 6: Should your use default Hibernate templates?
- 2.7 Question 7: Can you implement ‘Join’ into Hibernate by using SQL?
- 2.8 Question 8: Name and define the three states of objects in Hibernate.
- 2.9 Question 9: Name the default cache in Hibernate.
- 2.10 Question 10: What is the main benefit of the Eclipse plugin?
- 3 Conclusions
IntroductionThe first part of this tutorial is dedicated to some of the more simple Hibernate interview questions. These are examples of questions that you might get at the beginning of your job interview, or if Hibernate isn’t the main framework that your employers are looking for. Even so, it is key to know these questions and answers, for they might become the deciding factor between you doing great in your interview, and flunking it completely.
Question 1: Describe Hibernate.A great example of a first question that you’re likely to get during your job interview, your potential employers are going to test your skills in describing the framework. You are likely to encounter similar Hibernate interview questions through ought the job interview – ones that require you to explain a concept or define something. Hibernate is a Java-based framework. It is designed to create database-based apps. A great feature of the framework (and one of the main ones that it is loved for) is that it represents the database in the form of objects. These objects can then be written without any specific SQL knowledge. This is great because it saves developers and programmers a lot of time – something that has a huge value when it comes to programming! Hibernate also has inbuilt object mapping – this minimizes the number of lines of code needed for the apps to function.
Question 2: What is ‘ORM’?ORM is an acronym for “Object-Related Mapping”. It is a philosophy that is aimed at making data manipulation and access as simple as possible. The way that it achieves this is by (quote on quote) mapping objects according to their data. It’s the very basic concept that Hibernate is built upon, and is derived from Java (it being an object-oriented programming language).
Question 3: Name a few Hibernate benefits.
Question 4: What is the syntax to create a SQL query?To create a SQL query in Hibernate, you would have to use this line of syntax:
Session.createSQLQueryDon’t be surprised if you get this and similar Hibernate interview questions during your job interview. Syntax is an important aspect of Hibernate, so you are bound to get asked to provide multiple different answers and examples concerning and involving it.
Question 5: Define ‘dialect’.A dialect can be a singular file or a group of files (the latter is more often the case). These files are used to connect the Hibernate database with the Java class. You could say that the dialect is like the “translation tool” between Hibernate and its core database.
Question 6: Where are the mapping documents located within the framework?All of the mapping documents of Hibernate are located within what is known as the Configuration Interface. This interface is used to both store the before mentioned documents and issue specific configuration commands to the framework itself. You could go as far as to say that this could be viewed as one of the trick Hibernate interview questions. Most employers would ask you something in the lines of “What is the Configuration Interface used for in Hibernate?”. However, the question above is concerned with the actual functions of the interface – you have to really know the Configuration Interface to be able to answer swiftly and correct. So, be on the lookout of similar questions!
Question 7: Name three of the main components of Hibernate.There are more than three components to choose from, so you really shouldn’t have a problem answering this question. As an example, you could say: session, the above-mentioned configuration and query.
Question 8: What is a ‘Hibernate Session’?
Question 9: How can you configure Hibernate?The immediate answer would be that there are two main ways to do so – using XML and then the annotation provided by Java. However, this might again be one of the trick Hibernate interview questions. How so? In Hibernate versions earlier than Hibernate 4.0, the only way to configure the framework was by utilizing XML. The option to do so with Java-based annotations only became available in versions 4.0 and later. That why you should listen carefully to the Hibernate interview questions that your potential employers give you – did they specify the version of the framework? Which versions are they talking about? Naturally, your best bet is to simply answer by stating both of the possible configuration methods and then elaborating further on – your employers might be quite impressed!
Question 10: What’s the syntax of adding a criterion into the SQL query?The syntax would look like this: