Hibernate One to Many Example using Annotation
In this section, we will perform one-to-many association to map the list object of persistent class using annotation.
Here, we are using the scenario of Forum where one question has multiple answers.
In such case, there can be many answers for a question and each answer may have its own information that is why we have used list in the persistent class (containing the reference of Answer class) to represent a collection of answers.
Example of One to Many mapping using annotation
1) Create the Persistent class
This persistent class defines properties of the class including List.
2) Add project information and configuration in pom.xml file.
Open pom.xml file and click source. Now, add the below dependencies between <dependencies> .... </dependencies> tag.
3) Create the configuration file
This file contains information about the database and mapping file.
4) Create the class to store the data
In this class we are storing the data of the question class.
Note - Using these annotations in a similar way, we can also perform one-to-many association for set, map and bag objects.
How to fetch the data of List
Here, we have used HQL to fetch all the records of Question class including answers. In such case, it fetches the data from two tables that are functional dependent.