how can get the last inserted value in spring mongodb? - spring

Question

i have a class Named Device
#Document
public class Devise
{
#Id
public String id;
public String reference;
#DBRef
public List<Mesures> listMes;
public Devise() {
// TODO Auto-generated constructor stub
}
public Devise(String reference, List<Mesures> listMes) {
super();
this.reference = reference;
this.listMes = listMes;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getReference() {
return reference;
}
public void setReference(String reference) {
this.reference = reference;
}
public List<Mesures> getListMes() {
return listMes;
}
public void setListMes(List<Mesures> listMes) {
this.listMes = listMes;
}
}
another class named Mesures
#Document
public class Mesures {
#Id
private String id;
private Double value;
private Date date;
#DBRef
private Devise devise;
public Mesures() {
// TODO Auto-generated constructor stub
}
public Mesures(Double value, Date date, Devise devise) {
super();
this.value = value;
this.date = date;
this.devise = devise;
}
public Mesures(Double value, Date date) {
super();
this.value = value;
this.date = date;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Double getValue() {
return value;
}
public void setValue(Double value) {
this.value = value;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public Devise getDevise() {
return devise;
}
public void setDevise(Devise devise) {
this.devise = devise;
}
and this is the MesuresRepository who extend from Mongo Repository
public interface MesureRepository extends MongoRepository<Mesures, String>{
public Mesures findTopByDeviseOrderByDateDesc(String DeviseId);
}
and this is the main app (Spring boot app)
ApplicationContext ctx = SpringApplication.run(UiApplication.class, args);
MesureDAO MDAO = ctx.getBean(MesureDAO.class);
DeviceDAO DDAO = ctx.getBean(DeviceDAO.class);
DateFormat df = new SimpleDateFormat("yyyy-mm-dd-hh-mm-ss");
Mesures m1 = new Mesures(10.0, df.parse("2016-11-12-12-51-42"));
Mesures m2 = new Mesures(15.2,df.parse("2016-11-12-12-52-42"));
//add Mesure
MDAO.addMesure(m1);
MDAO.addMesure(m2);
List<Mesures>listMes = new ArrayList<>();
listMes.add(m1);
listMes.add(m2);
//add Device
Devise D = new Devise("G2fgG123", listMes);
DDAO.addDevice(D);
and the database look like :
db.devise.find().pretty()
{
"_id" : ObjectId("58bc8218d980530898a0b047"),
"_class" : "demo.model.Devise",
"reference" : "G2fgG123",
"listMes" : [
DBRef("mesures", ObjectId("58bc8218d980530898a0b045")),
DBRef("mesures", ObjectId("58bc8218d980530898a0b046"))
]
}
and the restController like this
#RestController
public class MesuressController {
#Autowired
MesureRepository mesureRepo;
#RequestMapping(value = "/mesure/{DeviseId}")
public Mesures findByDeviseIdOrderByDate(#PathVariable("DeviseId")String DeviseId) {
return mesureRepo.findTopByDeviseIdOrderByDateDesc(DeviseId);
}}
and this is the measure Doc
db.mesures.find().pretty()
{
"_id" : ObjectId("58bc8218d980530898a0b045"),
"_class" : "demo.model.Mesures",
"value" : 10,
"date" : ISODate("2016-01-11T23:51:42Z")
}
{
"_id" : ObjectId("58bc8218d980530898a0b046"),
"_class" : "demo.model.Mesures",
"value" : 15.2,
"date" : ISODate("2016-01-11T23:52:42Z")
}
and this the device document after changing
db.devise.find().pretty()
{
"_id" : ObjectId("58bd306500ff6d1670916a7d"),
"_class" : "demo.model.Devise",
"reference" : "G2fgG123",
"listMes" : [
{
"_id" : ObjectId("58bd306500ff6d1670916a7b"),
"value" : 10,
"date" : ISODate("2016-01-11T23:51:42Z")
},
{
"_id" : ObjectId("58bd306500ff6d1670916a7c"),
"value" : 15.2,
"date" : ISODate("2016-01-11T23:52:42Z")
}
]

Answer 1

Try to use mongodb's $natural operator:
Query query = new Query().with(new Sort(Direction.ASC, "$natural"));
BasicQuery basicQuery = new BasicQuery(new BasicDBObject());
basicQuery.setSortObject(new BasicDBObject("$natural", -1));