Composite Primary Keys in Spring Boot JPA In Spring Boot, the Java Persistence API (JPA) provides an interface for working with databases. The use of a primary key in a database is a common practice to uniquely identify a record. However, there are cases where a single primary key may not be sufficient, and a composite primary key may be required. In this blog, we will discuss how to use composite primary keys in Spring Boot JPA. Defining a Composite Primary Key To define a composite primary key, we need to create a class that represents the primary key. This class should contain fields that correspond to the primary key columns in the database table. The class should also implement the Serializable interface and define equals() and hashCode() methods. Here's an example: public class EmployeeId implements Serializable { private Long departmentId; private Long employeeId; // Constructors, getters and setters, equals(), and hashCode() methods } ...
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