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JPA List Mapping

A List is an interface which is used to insert and delete elements on the basis of index. It can be used when there is a requirement of retrieving elements in a user-defined order.

List Mapping Example

In this example, we embed an object in an entity class and define it as a collection type List.

This example contains the following steps: -

  • Create an entity class Employee.java under com.javatpoint.jpa package that contains employee id, name and embedded object (employee Address). The annotation @ElementCollection represents the embedded object.

Employee.java

  • Now, create a class of embedded object Address.java under com.javatpoint.jpa package. The annotation @Embeddable represents the embeddable object.

Address.java

  • Now, map the entity class and other databases confiuguration in Persistence.xml file.

Persistence.xml

  • Create a persistence class ListMapping.java under com.javatpoint.collection package to persist the entity object with data.

ListMapping.java

Output:

After the execution of the program, the following table are generated under MySQL workbench.

  • Employee table - This table contains the employee details. To fetch data, run select * from employee query in MySQL.

JPA List Mapping
  • Employee_address table - This table represents the mapping between employee and address table. To fetch data, run select * from employee_address query in MySQL.

JPA List Mapping
Next TopicJPA Set Mapping




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