EP-6a Spring Boot JPA Derived Methods Example Part-1
Spring Boot, MySQL, JPA, Restful API Derived Methods Example Part-1
If you don't know how to set base project
Please follow the spring boot tutorial
spring-boot link :
• EP-1a spring boot hello world example...
Channel lnk : / @gk-care
Link in description
? - How to retrieve data from Non-Primary Key
If we want to retrieve data apart from the Primary Key Column,
than first approach will be the Derived Method approach.
Spring Boot automated this concept. The developer can write only abstract method i.e. only method signature without any implementation(only definition) and the entire implementation will be taken care by Spring boot
Derived Method Concept: To retrieve data
needs to follow some rules in the process to define methods
1) The "findBy" keyword is a prefix.
2) should be append property name( entitiy-variable-name) followed by prefix.
3) The method name should be in camel case format
example: findByEmail(String email),
@Entity
@Table(name="tbl_employee")
public class Employee {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="emp_id")
private Integer empId;
private String name;
private String email;
.
.
.
}
Note: There are many ways to use the "Derived method" like "findBy" as I Explained
"deleteBy", "countBy"
Use this link "https://docs.spring.io/spring-data/jp..." to check it
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