hi i'm working with spring boot and rest in my project and i estableshed a relation ManyToOne between two enteties but i'm unable to send the postman request to add a mission along with its category i'm not even sure that the two enteties are correctly related
he are the two entities and the contoller
the mission etity
#Entity
#Table(name="missions")
public class Mission {
public Mission() {
}
public Mission(int id, String state, String adresse, int etatMission, String image, List<Categorie> categories,
String ville, int duree, String description, String domaine) {
this.id = id;
this.state = state;
this.adresse = adresse;
this.etatMission = etatMission;
this.image = image;
this.categories = categories;
this.ville = ville;
this.duree = duree;
this.description = description;
this.domaine = domaine;
}
public List<Categorie> getCategories() {
return categories;
}
public void setCategories(List<Categorie> categories) {
this.categories = categories;
}
public String getVille() {
return ville;
}
public void setVille(String ville) {
this.ville = ville;
}
public Mission(Map<String,Object> userMap) {
if (userMap.get("id") != null)
this.id = (int )userMap.get("id");
this.state = (String) userMap.get("state");
this.duree = (int) userMap.get("duree");
this.domaine = (String) userMap.get("domaine");
this.description = (String) userMap.get("description");
this.ville=(String) userMap.get("ville");
this.adresse=(String) userMap.get("adresse");
this.etatMission=(int) userMap.get("etatMission");
this.image=(String) userMap.get("image");
this.categories=(List<Categorie>) userMap.get("categories");
}
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
private String state;
private String adresse;
private int etatMission;
private String image;
#OneToMany(mappedBy="mission",cascade=CascadeType.ALL)
private List<Categorie> categories;
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
private String ville;
public int getEtatMission() {
return etatMission;
}
public void setEtatMission(int etatMission) {
this.etatMission = etatMission;
}
private int duree;
private String description;
private String domaine;
public String getDomaine() {
return domaine;
}
public void setDomaine(String domaine) {
this.domaine = domaine;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getAdresse() {
return adresse;
}
public void setAdresse(String adresse) {
this.adresse = adresse;
}
#Override
public String toString() {
return "Mission [id=" + id + ", state=" + state + ", duree=" + duree + "]";
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public int getDuree() {
return duree;
}
public void setDuree(int duree) {
this.duree = duree;
}
public void add(Categorie cat) {
if (categories == null) {
categories = new ArrayList<>();
}
categories.add(cat);
cat.setMission(this);
}
}
the category entety
#Entity
#Table(name="categorie")
public class Categorie {
public Categorie() {
}
public Categorie(Map<String, Object> catMap) {
this.id=(int) catMap.get("id");
this.nom = (String) catMap.get("nom");
this.mission =(Mission) catMap.get("mission_id") ;
}
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id ;
private String nom;
#ManyToOne
#JoinColumn(name="mission_id",referencedColumnName="id")
private Mission mission;
public Categorie(int id, String nom, Mission mission) {
this.id = id;
this.nom = nom;
this.mission = mission;
}
public String getNom() {
return nom;
}
public void setNom(String nom) {
this.nom = nom;
}
#Override
public String toString() {
return "Categorie [nom=" + nom + "]";
}
public Mission getMission() {
return mission;
}
public void setMission(Mission mission) {
this.mission = mission;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}
here's the controller for mission
package ma.ac.emi.MinuteBrico.Controllers;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import ma.ac.emi.MinuteBrico.Services.MissionServices;
import ma.ac.emi.MinuteBrico.Models.Mission;
#RestController
public class MissionController {
#Autowired
private MissionServices missionService;
#CrossOrigin
#GetMapping("/missions")
public List<Mission> index(){
return missionService.findAll();
}
#CrossOrigin
#GetMapping("/missions/{id}")
public Optional<Mission> indexById(#PathVariable String id){
int missionId = Integer.parseInt(id);
return missionService.findById(missionId);
}
#CrossOrigin()
#PostMapping("/missions")
public String create(#RequestBody Map<String, Object> missionMap) {
System.out.println(missionMap);
Mission mission = new Mission(missionMap);
missionService.savemission(mission);
return "Mission ajouté";
}
}
package ma.ac.emi.MinuteBrico.Repositories;
import java.util.List;
import org.springframework.data.jpa.repository.JpaRepository;
import ma.ac.emi.MinuteBrico.Models.Mission;
public interface MissionRepository extends JpaRepository<Mission,Integer> {
}
the postman request
{
"state": "Urgent",
"adresse": "Av ben drisse",
"etatMission": 0,
"image": "assets/Brand.jpeg",
"ville": "Chefchaouen",
"duree": 480000,
"description": "je veux quelqu\\'un pour me faire une cuisne",
"domaine": "Plomberie",
"categories":[
{
"id":15,
"nom":"Menuiserie",
"mission":{
"field":"value"
}
}
]
}
try to add #ManyToOne(cascade = CascadeType.ALL)
I use spring-boot-data-jpa-2.0 to get data from db. A table has many-to-one relation, and the query speed is too slow, 1000 lines data with foreign key will cost 15s, but by native sql it will cost only 0.07s. I search the issue and found that it is because 1+n problem.
Some solution that says use 'join fetch' in hql can solve. When I use the 'join fetch' in hql, query speed not change.
The system designed as a pure rest service, with spring boot framework.
contract entity
import java.time.LocalDateTime;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
#Entity
#Table(name = "MA_CONTRACTINFO_B")
public class MaContractinfoB implements java.io.Serializable {
// Fields
private String contractcd;
private MaDepartmentB maDepartmentB;
private Double contractid;
private String contractnm;
private String partya;
private String deputycontract;
private String prjtype;
private Double fundt;
private String bustype;
private String contractstatus;
private Double contractyear;
private String fundratio;
private LocalDateTime signdate;
private String prj;
private LocalDateTime loaddate;
private String udep;
private Double fundaccont;
private Double receipt;
private Double fundacctot;
private Double receiptot;
private String loc;
private String riskasscd;
private String rm;
private String pm;
private Double fundaccrec;
private String adminleader;
private String techleader;
private String leader;
private String progress;
private String cashadmin;
private String timetask;
private String contracttp;
// Constructors
/** default constructor */
public MaContractinfoB() {
}
/** minimal constructor */
public MaContractinfoB(String contractcd) {
this.contractcd = contractcd;
}
/** full constructor */
public MaContractinfoB(String contractcd, MaDepartmentB maDepartmentB, Double contractid, String contractnm,
String partya, String deputycontract, String prjtype, Double fundt, String bustype, String contractstatus,
Double contractyear, String fundratio, LocalDateTime signdate, String prj, LocalDateTime loaddate,
String udep, Double fundaccont, Double receipt, Double fundacctot, Double receiptot, String loc,
String riskasscd, String rm, String pm, Double fundaccrec, String adminleader, String techleader,
String leader, String progress, String cashadmin, String timetask, String contracttp) {
this.contractcd = contractcd;
this.maDepartmentB = maDepartmentB;
this.contractid = contractid;
this.contractnm = contractnm;
this.partya = partya;
this.deputycontract = deputycontract;
this.prjtype = prjtype;
this.fundt = fundt;
this.bustype = bustype;
this.contractstatus = contractstatus;
this.contractyear = contractyear;
this.fundratio = fundratio;
this.signdate = signdate;
this.prj = prj;
this.loaddate = loaddate;
this.udep = udep;
this.fundaccont = fundaccont;
this.receipt = receipt;
this.fundacctot = fundacctot;
this.receiptot = receiptot;
this.loc = loc;
this.riskasscd = riskasscd;
this.rm = rm;
this.pm = pm;
this.fundaccrec = fundaccrec;
this.adminleader = adminleader;
this.techleader = techleader;
this.leader = leader;
this.progress = progress;
this.cashadmin = cashadmin;
this.timetask = timetask;
this.contracttp = contracttp;
}
// Property accessors
#Id
#Column(name = "CONTRACTCD", unique = true, nullable = false)
public String getContractcd() {
return this.contractcd;
}
public void setContractcd(String contractcd) {
this.contractcd = contractcd;
}
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "DEPID")
public MaDepartmentB getMaDepartmentB() {
return this.maDepartmentB;
}
public void setMaDepartmentB(MaDepartmentB maDepartmentB) {
this.maDepartmentB = maDepartmentB;
}
#Column(name = "CONTRACTID", precision = 38, scale = 8)
public Double getContractid() {
return this.contractid;
}
public void setContractid(Double contractid) {
this.contractid = contractid;
}
#Column(name = "CONTRACTNM")
public String getContractnm() {
return this.contractnm;
}
public void setContractnm(String contractnm) {
this.contractnm = contractnm;
}
#Column(name = "PARTYA")
public String getPartya() {
return this.partya;
}
public void setPartya(String partya) {
this.partya = partya;
}
#Column(name = "DEPUTYCONTRACT")
public String getDeputycontract() {
return this.deputycontract;
}
public void setDeputycontract(String deputycontract) {
this.deputycontract = deputycontract;
}
#Column(name = "PRJTYPE")
public String getPrjtype() {
return this.prjtype;
}
public void setPrjtype(String prjtype) {
this.prjtype = prjtype;
}
#Column(name = "FUNDT", precision = 38, scale = 8)
public Double getFundt() {
return this.fundt;
}
public void setFundt(Double fundt) {
this.fundt = fundt;
}
#Column(name = "BUSTYPE")
public String getBustype() {
return this.bustype;
}
public void setBustype(String bustype) {
this.bustype = bustype;
}
#Column(name = "CONTRACTSTATUS")
public String getContractstatus() {
return this.contractstatus;
}
public void setContractstatus(String contractstatus) {
this.contractstatus = contractstatus;
}
#Column(name = "CONTRACTYEAR", precision = 38, scale = 8)
public Double getContractyear() {
return this.contractyear;
}
public void setContractyear(Double contractyear) {
this.contractyear = contractyear;
}
#Column(name = "FUNDRATIO")
public String getFundratio() {
return this.fundratio;
}
public void setFundratio(String fundratio) {
this.fundratio = fundratio;
}
#Column(name = "SIGNDATE", length = 11)
public LocalDateTime getSigndate() {
return this.signdate;
}
public void setSigndate(LocalDateTime signdate) {
this.signdate = signdate;
}
#Column(name = "PRJ")
public String getPrj() {
return this.prj;
}
public void setPrj(String prj) {
this.prj = prj;
}
#Column(name = "LOADDATE", length = 11)
public LocalDateTime getLoaddate() {
return this.loaddate;
}
public void setLoaddate(LocalDateTime loaddate) {
this.loaddate = loaddate;
}
#Column(name = "UDEP")
public String getUdep() {
return this.udep;
}
public void setUdep(String udep) {
this.udep = udep;
}
#Column(name = "FUNDACCONT", precision = 38, scale = 8)
public Double getFundaccont() {
return this.fundaccont;
}
public void setFundaccont(Double fundaccont) {
this.fundaccont = fundaccont;
}
#Column(name = "RECEIPT", precision = 38, scale = 8)
public Double getReceipt() {
return this.receipt;
}
public void setReceipt(Double receipt) {
this.receipt = receipt;
}
#Column(name = "FUNDACCTOT", precision = 38, scale = 8)
public Double getFundacctot() {
return this.fundacctot;
}
public void setFundacctot(Double fundacctot) {
this.fundacctot = fundacctot;
}
#Column(name = "RECEIPTOT", precision = 38, scale = 8)
public Double getReceiptot() {
return this.receiptot;
}
public void setReceiptot(Double receiptot) {
this.receiptot = receiptot;
}
#Column(name = "LOC")
public String getLoc() {
return this.loc;
}
public void setLoc(String loc) {
this.loc = loc;
}
#Column(name = "RISKASSCD")
public String getRiskasscd() {
return this.riskasscd;
}
public void setRiskasscd(String riskasscd) {
this.riskasscd = riskasscd;
}
#Column(name = "RM")
public String getRm() {
return this.rm;
}
public void setRm(String rm) {
this.rm = rm;
}
#Column(name = "PM")
public String getPm() {
return this.pm;
}
public void setPm(String pm) {
this.pm = pm;
}
#Column(name = "FUNDACCREC", precision = 38, scale = 8)
public Double getFundaccrec() {
return this.fundaccrec;
}
public void setFundaccrec(Double fundaccrec) {
this.fundaccrec = fundaccrec;
}
#Column(name = "ADMINLEADER")
public String getAdminleader() {
return this.adminleader;
}
public void setAdminleader(String adminleader) {
this.adminleader = adminleader;
}
#Column(name = "TECHLEADER")
public String getTechleader() {
return this.techleader;
}
public void setTechleader(String techleader) {
this.techleader = techleader;
}
#Column(name = "LEADER", length = 20)
public String getLeader() {
return this.leader;
}
public void setLeader(String leader) {
this.leader = leader;
}
#Column(name = "PROGRESS", length = 1000)
public String getProgress() {
return this.progress;
}
public void setProgress(String progress) {
this.progress = progress;
}
#Column(name = "CASHADMIN", length = 20)
public String getCashadmin() {
return this.cashadmin;
}
public void setCashadmin(String cashadmin) {
this.cashadmin = cashadmin;
}
#Column(name = "TIMETASK", length = 2000)
public String getTimetask() {
return this.timetask;
}
public void setTimetask(String timetask) {
this.timetask = timetask;
}
#Column(name = "CONTRACTTP", length = 50)
public String getContracttp() {
return this.contracttp;
}
public void setContracttp(String contracttp) {
this.contracttp = contracttp;
}
/**
* toString
*
* #return String
*/
#Override
public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append(getClass().getName()).append("#").append(Integer.toHexString(hashCode())).append(" [");
buffer.append("contractcd").append("='").append(getContractcd()).append("' ");
buffer.append("maDepartmentB").append("='").append(getMaDepartmentB()).append("' ");
buffer.append("contractid").append("='").append(getContractid()).append("' ");
buffer.append("contractnm").append("='").append(getContractnm()).append("' ");
buffer.append("partya").append("='").append(getPartya()).append("' ");
buffer.append("deputycontract").append("='").append(getDeputycontract()).append("' ");
buffer.append("prjtype").append("='").append(getPrjtype()).append("' ");
buffer.append("fundt").append("='").append(getFundt()).append("' ");
buffer.append("bustype").append("='").append(getBustype()).append("' ");
buffer.append("contractstatus").append("='").append(getContractstatus()).append("' ");
buffer.append("contractyear").append("='").append(getContractyear()).append("' ");
buffer.append("fundratio").append("='").append(getFundratio()).append("' ");
buffer.append("signdate").append("='").append(getSigndate()).append("' ");
buffer.append("prj").append("='").append(getPrj()).append("' ");
buffer.append("loaddate").append("='").append(getLoaddate()).append("' ");
buffer.append("udep").append("='").append(getUdep()).append("' ");
buffer.append("fundaccont").append("='").append(getFundaccont()).append("' ");
buffer.append("receipt").append("='").append(getReceipt()).append("' ");
buffer.append("fundacctot").append("='").append(getFundacctot()).append("' ");
buffer.append("receiptot").append("='").append(getReceiptot()).append("' ");
buffer.append("loc").append("='").append(getLoc()).append("' ");
buffer.append("riskasscd").append("='").append(getRiskasscd()).append("' ");
buffer.append("rm").append("='").append(getRm()).append("' ");
buffer.append("pm").append("='").append(getPm()).append("' ");
buffer.append("fundaccrec").append("='").append(getFundaccrec()).append("' ");
buffer.append("adminleader").append("='").append(getAdminleader()).append("' ");
buffer.append("techleader").append("='").append(getTechleader()).append("' ");
buffer.append("leader").append("='").append(getLeader()).append("' ");
buffer.append("progress").append("='").append(getProgress()).append("' ");
buffer.append("cashadmin").append("='").append(getCashadmin()).append("' ");
buffer.append("timetask").append("='").append(getTimetask()).append("' ");
buffer.append("contracttp").append("='").append(getContracttp()).append("' ");
buffer.append("]");
return buffer.toString();
}
}
department entity
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
#Entity
#Table(name = "MA_DEPARTMENT_B")
public class MaDepartmentB implements java.io.Serializable {
// Fields
private Long id;
private String name;
private String leader;
private Set<MaContractinfoB> maContractinfoBs = new HashSet<MaContractinfoB>(0);
private Set<MaContraimB> maContraimBs = new HashSet<MaContraimB>(0);
// Constructors
/** default constructor */
public MaDepartmentB() {
}
/** minimal constructor */
public MaDepartmentB(Long id) {
this.id = id;
}
/** full constructor */
public MaDepartmentB(Long id, String name, String leader, Set<MaContractinfoB> maContractinfoBs,
Set<MaContraimB> maContraimBs) {
this.id = id;
this.name = name;
this.leader = leader;
this.maContractinfoBs = maContractinfoBs;
this.maContraimBs = maContraimBs;
}
// Property accessors
#Id
#Column(name = "ID", unique = true, nullable = false, precision = 10, scale = 0)
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
#Column(name = "NAME")
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
#Column(name = "LEADER")
public String getLeader() {
return this.leader;
}
public void setLeader(String leader) {
this.leader = leader;
}
#OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "maDepartmentB")
public Set<MaContractinfoB> getMaContractinfoBs() {
return this.maContractinfoBs;
}
public void setMaContractinfoBs(Set<MaContractinfoB> maContractinfoBs) {
this.maContractinfoBs = maContractinfoBs;
}
#OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "maDepartmentB")
public Set<MaContraimB> getMaContraimBs() {
return this.maContraimBs;
}
public void setMaContraimBs(Set<MaContraimB> maContraimBs) {
this.maContraimBs = maContraimBs;
}
/**
* toString
*
* #return String
*/
#Override
public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append(getClass().getName()).append("#").append(Integer.toHexString(hashCode())).append(" [");
buffer.append("id").append("='").append(getId()).append("' ");
buffer.append("name").append("='").append(getName()).append("' ");
buffer.append("leader").append("='").append(getLeader()).append("' ");
buffer.append("maContractinfoBs").append("='").append(getMaContractinfoBs()).append("' ");
buffer.append("maContraimBs").append("='").append(getMaContraimBs()).append("' ");
buffer.append("]");
return buffer.toString();
}
}
jparepository
public interface MaContractinfoBRepository extends JpaRepository<MaContractinfoB, Long> {
#Query("from MaContractinfoB c join fetch c.maDepartmentB")
List<MaContractinfoB> findAll();
#Query("select contractnm from MaContractinfoB")
List<String> findAllName();
// #Query("from MaContractinfoB c join fetch c.maDepartmentB")
// List test();
}
In MaContractinfoBRepository, When I use findAllName function, it will immediately return 1000 contract names in 0.05s. When I use findAll, it will cost 15s to get 1000 data with department entity, even I add join fetch. But if I get it by native sql in db tool such as navicat, it will cost only 0.07s.
Is any keypoint I missed? How to query the MaContractinfoB table not so slowly?
This is happening because internally with 'fetch' command also hibernate is lazy loading all the rows of Department entity for each Contract id whenever you call the findAll() method. So if there are n rows in Department for 1 Contract and in total there are m Contracts then the total number of calls to the database would be 'm * n'.
One way around this is by using DTO projections. Data Transfer Objects is an easy way to define all the required columns in one query and hit the database for once.
I have found this article useful which shows multiple ways of writing DTO projections.
https://thoughts-on-java.org/dto-projections/
One of the mentioned way is: Using JPQL you can use a constructor expression to define a constructor call with the keyword new followed by the fully classified class name of your DTO and a list of constructor parameters in curly braces.
Something like this:
TypedQuery<ContractWithDepartmentDetails> q = em.createQuery(
"SELECT new com.practice.model.ContractWithDepartmentDetails(c.id, c.name, d.name) FROM contract c JOIN c.department d",
ContractWithDepartmentDetails.class);
I have already written the code for inserting my data into my DB but I'm a bit confused on how to retrieve that data in json format and print in my jsp view using a jQuery data table. I have written some code on retrieving but I'm still stuck. Please help.
Here are my code snippets:
entity class:
package model.entity;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.Size;
#Entity
public class Products {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int productId;
#Size(min=1)
private String productName;
#Min(value=1, message = "Value cannot be zero or negative")
private double unitPrice;
#Size(min=1)
private String productDescription;
#Size(min=1)
private String category;
#Min(value = 1, message = " Quantity should be greater than zero and positive")
#Max(value= 99, message = " Quantity limit exceeded, value should be less than 100")
private int productQty;
public Products() {}
public Products(int productId, String productName, double unitPrice, String productDescription, String category, int productQty) {
super();
this.productQty = productQty;
this.productId = productId;
this.productName = productName;
this.unitPrice = unitPrice;
this.productDescription = productDescription;
this.category = category;
}
public int getProductQty() {
return productQty;
}
public void setProductQty(int productQty) {
this.productQty = productQty;
}
public int getProductId() {
return productId;
}
public void setProductId(int productId) {
this.productId = productId;
}
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
public double getUnitPrice() {
return unitPrice;
}
public void setUnitPrice(double unitPrice) {
this.unitPrice = unitPrice;
}
public String getProductDescription() {
return productDescription;
}
public void setProductDescription(String productDescription) {
this.productDescription = productDescription;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
DAOImplementation class:
package model.daoimpl;
import java.util.List;
import org.hibernate.Session;
import model.config.HibernateUtil;
import model.dao.IProductsDAO;
import model.entity.Products;
public class ProductsDAOImpl implements IProductsDAO {
private Session sess;
public ProductsDAOImpl() {
sess = HibernateUtil.getSessionFactory().openSession();
}
public boolean insertProduct(Products p) {
boolean b = true;
try
{
sess.beginTransaction();
sess.save(p);
sess.getTransaction().commit();
}catch(Exception ex)
{
b = false;
sess.getTransaction().rollback();
ex.printStackTrace();
}
return b;
}
public List<Products> getProducts()
{
List<Products> lp = null;
try
{
sess.beginTransaction();
lp = sess.createQuery("from Product",Products.class).getResultList();
}catch(Exception ex)
{
ex.printStackTrace();
}
return lp;
}
}
controller class:
#Controller
public class ProductController {
#RequestMapping(value="/manageproducts", method= RequestMethod.GET)
public String manageProductPage() {
return "manageproducts";
}
#RequestMapping(value="/insertproducts",method = RequestMethod.POST)
public String addInserProductsPage(#ModelAttribute("Products")Products p) {
IProductsDAO ip = new ProductsDAOImpl();
boolean b = ip.insertProduct(p);
if(b)
return "success";
else
return "manageproducts";
}
#RequestMapping(value="/listproducts", method = RequestMethod.GET)
public List<Products> listAllProducts(){
IProductsDAO ip = new ProductsDAOImpl();
return ip.getProducts();
}
}
So as you can see I have created the getproducts function but I haven't created the view for displaying products for which I want to use the jQuery datatable, Also I'm a bit confused on how to map the view with my controller. So please help.
You can use Model to send your list to the view page
#RequestMapping(value="/listproducts", method = RequestMethod.GET)
public String listAllProducts(Model model){
IProductsDAO ip = new ProductsDAOImpl();
List<Products> products = ip.getProducts();
model.addAttribute ("products",products);
Return "your view name without .jsp";
}
I am trying to fetch a row in mongo db collection which has an array of object id which is the ObjectID of rows of data in other collection. I want to fetch the populated array of rows of data from ther collection for each record of data from the current collection.
My collections are like this
Jobs
- ObjectID
- [ObjectIds(Object Ids of candidates)]
Candidates
-ObjectID
-Name
-Age
I am using
import org.springframework.data.mongodb.core.mapping.DBRef;
in my model class to indicate the reference.
#Document(collection = "jobcreations")
public class Job {
#Id
private String id;
#DBRef
private List<Candidate> _candidates;
private String jobID;
public String getjobID() {
return jobID;
}
public void setjobID(String jobid) {
this.jobID = jobid;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public JobCreation() {
super();
}
public List<Candidate> get_candidates() {
return _candidates;
}
public void set_candidates(List<Candidate> _candidates) {
this._candidates = _candidates;
}
public JobCreation(String jobID) {
super();
this.jobID = jobID;
}
#Override
public String toString() {
return "JobCreation [id=" + id + ", _candidates=" + _candidates + ", jobID=" + jobID + "]";
}
}
My candidate model class is like this
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
#Document(collection = "candidate")
public class Candidate {
#Id
private String _id;
private String name;
private int age;
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
/**
* #return the name
*/
public String getName() {
return name;
}
/**
* #param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* #return the age
*/
public String getAge() {
return age;
}
/**
* #param age the age to set
*/
public void setAge(int age) {
this.age = age;
}
public Candidate() {
super();
// TODO Auto-generated constructor stub
}
}
My main method where i call the db is
ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringMongoConfig.class);
MongoOperations mongoOperation = (MongoOperations) ctx.getBean("mongoTemplate");
List<JobCreation> listJobCreation = mongoOperation.findAll(JobCreation.class);
for(JobCreation jc : listJobCreation){
System.out.println(jc.toString());
}
Here i am getting the error
Exception in thread "main" org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type org.bson.types.ObjectId to type com.mkyong.model.CandidateProfile
at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:276)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:172)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:154)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getPotentiallyConvertedSimpleRead(MappingMongoConverter.java:673)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readCollectionOrArray(MappingMongoConverter.java:751)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1006)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$100(MappingMongoConverter.java:75)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:957)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValueInternal(MappingMongoConverter.java:713)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$2.doWithAssociation(MappingMongoConverter.java:257)
at org.springframework.data.mapping.model.BasicPersistentEntity.doWithAssociations(BasicPersistentEntity.java:252)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:254)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:212)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:176)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:172)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:75)
at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:1840)
at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:1536)
at org.springframework.data.mongodb.core.MongoTemplate.findAll(MongoTemplate.java:1057)
at com.mkyong.core.App.main(App.java:29)
Kindly help me how to solve this error.
Thanks in advance
I have a table that has 2 columns that create the primary key:
#Entity
#Table(name="DW.DW$SF$MONTHLY")
public class DWMonthly implements Serializable {
private static final long serialVersionUID = 1L;
#EmbeddedId DWMonthlyPK monthlyPK;
#Id
#Column(name="AID", insertable=false, updatable=false)
#IndexColumn(name="DW$SF$MONTHLY_PK")
private Long id;
#Column(name="CHNG_STATUS")
private BigDecimal chngStatus;
#Column(name="NAR")
private BigDecimal nar;
#Column(name="SF_AMID")
private String sfAmid;
#Temporal(TemporalType.TIMESTAMP)
#Column(name="N_DATE", insertable=false, updatable=false)
#IndexColumn(name="DW$SF$MONTHLY_PK")
private Date nDate;
public DWMonthly() {}
public DWMonthly(Long id, String sfAmid, Date nDate) {
this.id = id;
this.sfAmid = sfAmid;
this.nDate = nDate;
}
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public BigDecimal getChngStatus() {
return this.chngStatus;
}
public void setChngStatus(BigDecimal chngStatus) {
this.chngStatus = chngStatus;
}
public BigDecimal getNar() {
return this.nar;
}
public void setNar(BigDecimal nar) {
this.nar = nar;
}
public String getSfAmid() {
return this.sfAmid;
}
public void setSfAmid(String sfAmid) {
this.sfAmid = sfAmid;
}
public Date getNDate() {
return nDate;
}
public void setNarDate(Date nDate) {
this.nDate = nDate;
}
}
Embeddable table:
#Embeddable
public class DWMonthlyPK implements Serializable {
private static final long serialVersionUID = 1L;
#Column(name="AID")
private long aid;
#Temporal(TemporalType.TIMESTAMP)
#Column(name="N_DATE")
private java.util.Date nDate;
public DWMonthlyPK() {
}
public long getAid() {
return this.aid;
}
public void setAid(long aid) {
this.aid = aid;
}
public java.util.Date getNDate() {
return this.narDate;
}
public void setNDate(java.util.Date nDate) {
this.nDate = nDate;
}
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof DWMonthlyPK)) {
return false;
}
DWMonthlyPK castOther = (DWMonthlyPK)other;
return
(this.aid == castOther.aid)
&& this.nDate.equals(castOther.nDate);
}
public int hashCode() {
final int prime = 31;
int hash = 17;
hash = hash * prime + ((int) (this.aid ^ (this.aid >>> 32)));
hash = hash * prime + this.nDate.hashCode();
return hash;
}
}
Find the record and update:
#Repository(value="MonthlyNarDaoRepository")
#Import({JpaConfigurationImpl.class})
#Transactional(value="dwTransactionManager",readOnly = true, propagation=Propagation.REQUIRES_NEW)
public class MonthlyNarDaoImpl implements MonthlyNarDao {
#Override
#Transactional(value="dwTransactionManager")
public void findAndUpdateMonhtlyByAccountId(Map<DWAccount, UpsertResult> accountsLoadedResult) {
for (DWAccount dwAccount : accountsLoadedResult.keySet()){
try {
CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
CriteriaQuery<DWMonthlyNar> criteriaQuery = criteriaBuilder.createQuery(DWMonthlyNar.class);
Root<DWMonthlyNar> root = criteriaQuery.from(DWMonthlyNar.class);
Predicate p = criteriaBuilder.conjunction();
p = criteriaBuilder.and(criteriaBuilder.equal(root.get("id"), dwAccount.getId()), criteriaBuilder.notEqual(root.get("nar").as(BigDecimal.class), new BigDecimal(0.0)), criteriaBuilder.isNull(root.get("sfAmid")));
criteriaQuery.select(root);
criteriaQuery.where(p);
for (DWMonthlyNar dwMonthlyNar : this.entityManager.createQuery(criteriaQuery).getResultList()){
if (dwMonthlyNar.getSfAmid()==null || !dwMonthlyNar.getSfAmid().equals(accountsLoadedResult.get(dwAccount).getId())){
dwMonthlyNar.setSfAmid(accountsLoadedResult.get(dwAccount).getId());
this.entityManager.merge(dwMonthlyNar);
}
}
} catch (Exception e) {
logger.error("MonthlyNarDaoImpl.findAndUpdateMonhtlyNarByAccountId(): " + e.getMessage());
}
}
}
}
Error:
Hibernate: update DW.DW$SF$MONTHLY set CHNG_STATUS=?, NAR=?,
SF_AMID=? where AID=? and NAR_DATE=? 16:04:58.864 [main] DEBUG
o.h.e.jdbc.spi.SqlExceptionHelper - Invalid column index [n/a]
java.sql.SQLException: Invalid column index