I have several application-x.properties files which are used for different profiles and each file contains a property with a specific value for each profile. I want to use this property in queries to database as a parameter.
Is it possible to add it using SpEL or something else?
For instance application.properties:
query.parameters.role: ADMIN
possible usage:
@Query(value = "select u from User u where u.role = :#{query.parameters.role}")
Set<User> getAllUsers();
You might do it by following way:
1.- Find all users by role using Repository Query Keywords
@Repository
public interface UserRepository extends JpaRepository<User, UUID> {
Set<User> findByRole(String role);
}
2.- Create a method called getAllUsers in UserService and get role value by using @Value:
@Service
public class UserService {
@Autowired
private UserRepository repository;
@Value("${query.parameters.role}")
private String role;
public Set<User> getAllUsers() {
return repository.findByRole(role);
}
}
Other way to answer to this question is implement a custom SpEL that is supported by @Query you can take a look this SpEL support in Spring Data JPA
Then you should follow these steps for your case:
1.- Create a ConfigProperties class so that you can read and get the application.properties.
@Configuration
@PropertySource("classpath:application.properties")
@ConfigurationProperties(prefix = "query")
public class ConfigProperties {
private Parameters parameters;
// standard getters and setters
}
public class Parameters {
private String role;
// standard getters and setters
}
2.- Implement a custom EvaluationContextExtensionSupport and reference to ConfigProperties
public class PropertyEvaluationContextExtension extends EvaluationContextExtensionSupport {
private final ConfigProperties configProperties;
public PropertyEvaluationContextExtension(final ConfigProperties configProperties) {
this.configProperties= configProperties;
}
@Override
public String getExtensionId() {
return "properties";
}
@Override
public ConfigProperties getRootObject() {
return this.configProperties;
}
}
3.- Create a bean in order to be called your custom PropertyEvaluationContextExtension
@Configuration
public class CustomConfig {
private final ConfigProperties configProperties;
public CustomConfig(final ConfigProperties configProperties) {
this.configProperties= configProperties;
}
@Bean
EvaluationContextExtensionSupport propertyExtension() {
return new PropertyEvaluationContextExtension(configProperties);
}
}
4.- Call the query.parameters.role by following format: ?#{query.parameters.role}
@Query(value = "SELECT u FROM User u WHERE u.role = ?#{query.parameters.role}")
Set<User> getAllUsers();
