How can i pass an string parameter to custom repository method? - ajax

Question

I have a problem with AJAX + Rest + Spring boot + MySQL. Request is sucess but response is empty, no matter the format used in the request. In fact, the request payload shows ["customer" : "MyCustomer"] so problem is in controller, i think.
AJAX
function ajax_ciudad(customer) { // onchange en select box
$.ajax({
type: "POST",
contentType: "application/json",
url: "/api/ciudades",
data: JSON.stringify(customer),
dataType: 'json',
cache: false,
timeout: 600000,
}).then(function(data) {
DO SOMETHING....
});
});
}
CONTROLLER
#RestController
#RequestMapping
public class SearchController {
#Autowired
private MyRepository myRepository;
#PostMapping("/api/ciudades")
public #ResponseBody List<?> getSedes(String customer){
List<Canal> ciudades = myRepository.findBySede(customer);
return ciudades;
}
REPOSITORY
#Query(value ="SELECT * FROM canal WHERE cliente = ?1", nativeQuery = true)
List<Canal> findBySede(#Param("customer") String customer);
... Always return an empty object []
enter image description here
I have tried several formats for data, i tried getting the Select value using .val() to get the String, using .value to get the html value.... If i put manually a parameter like myRepository.findBySede("MyString") the ajax response has info, but when i pass the value it doesn't work; What i'm doing wrong? Thanks for your help
My entity class
#Entity
#Table(name = "canal")
public class Canal {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Column(name = "idcanal", unique = true, nullable = false)
int id;
#Column(name = "cliente")
String cliente;
#Column(name = "ciudad")
String ciudad;
#Column(name = "sede")
String sede;
#Column(name = "canal")
String canal;
#Column(name = "ip_pe")
String ip_pe;
#Column(name = "nombre_pe")
String nombre_pe;
#Column(name = "ipwan_pe")
String ipwan_pe;
#Column(name = "puerto_pe")
String puerto_pe ;
#Column(name = "ipwan_router")
String ipwan_router;
#Column(name = "enrutamiento")
String enrutamiento;
*****getters and setters****
}

Answer 1

I am hoping you have defined your repo correctly and returning correct data based on customer string.
Pass from ajax "customer" as #Param and Define your controller like this as #RestController includes #Controller and #ResponseBody:
#RestController
public class SearchController {
#Autowired
private MyRepository myRepository;
#PostMapping("/api/ciudades")
public List<Canal> getSedes(#Param("customer") String customer){
List<Canal> ciudades = myRepository.findBySede(customer);
return ciudades;
}
Or better way, return ResponseEntity..
#RestController
public class SearchController {
#Autowired
private MyRepository myRepository;
#PostMapping("/api/ciudades")
public ResponseEntity<?> getSedes(#Param("customer") String customer){
List<Canal> ciudades = myRepository.findBySede(customer);
return new ResponseEntity<>(ciudades , HttpStatus.OK);
}
Define your method like this in repo:
#Repository|
public interface MyRepository extends CrudRepository<Canal, String>
#Query(value ="SELECT * FROM canal GROUP BY cliente", nativeQuery = true)
List<Canal> findByIdcanal(); // works fines
//I assume here you have canal table and cliente is column in it as you
running native query
#Query(value ="SELECT * FROM canal WHERE cliente = ?1", nativeQuery = true)
List<Canal> findBySede(String customer); // doesn't work
//OR try this as JPQL if you have Canal is entity and cliente as string type in it.
#Query(value ="Select c from Canal c WHERE c.cliente = :cliente")
List<Canal> findBySede(#Param("cliente") String customer);
//OR simply have Named query I assume you have Canal and cliente string type
List<Canal> findByCliente(String customer);
}
UPDATE as I checked your native query is fine..
If you want to send customer(string) as #RequestBody in controller then follow below:
Create a Class Customer
public class Customer {
private String customer;
public String getCustomer() {
return customer;
}
public void setCustomer(String customer) {
this.customer = customer;
}
}
handle request as #RequestBody
#PostMapping("/api/ciudades")
public ResponseEntity<?> getSedes(#RequestBody Customer customer){
List<Canal> ciudades = myRepository.findBySede(customer.getCustomer());
return new ResponseEntity<>(ciudades , HttpStatus.OK);
}