I've a field which is not primary key id. how can i fetch data using JPA repository through that non primary key? - spring-boot

Question

I've a model User. There's a field which is contact and it's a non primary key. How can i fetch data using this key? it's an unique key.
This is my model.
#Entity
#Table(name = "tbl_user")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "user_id")
long userId;
#Column(name = "name")
String name;
#Column(name = "email")
String email;
#Column(name = "contact")
String contact;
#Column(name = "category")
String category;
public long getUserId() {
return userId;
}
public void setUserId(long userId) {
this.userId = userId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getContact() {
return contact;
}
public void setContact(String contact) {
this.contact = contact;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public User() {
}
}
This is the method inside Service layer.
public User getUserByContact(String contact) {
Optional<User> result = userRepository.findByContact(contact);
User user = result.get();
return user;
}
This is the repository.
#Repository
public interface UserRepository extends JpaRepository<User, Long> {
#Query("select u from User u where u.contact = ?1")
User findByContact(String contact);
}
I'm getting an error on "select u from User u where u.contact = ?1" this portion under User and it's saying "cant resolve symbol User". Would appreciate any sort of help.

Answer 1

Leave out the #Query part, that part is not needed if you extend a JpaRepository. As stated in the documentation JPA derives the query from the method name.
I'm not sure whether this is an issue, but in your entity class you use a long for id and in your repository definition (JpaRepository<User, Long>) you use a Long. Correct me if this is not problematic.

Answer 2

If you want to use #Query, then the right approach would be to use #Param to define the variable
#Query("select u from User u where u.contact = :contactVar ", nativeQuery = true)
User findByContact(#Param("contactVar")String contactVar);