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M:N table does not update

I have m:n relationship between User and Document. I am creating Document object, getting List - setDocumentsForUsers() and then I am persisting that object. Problem is, that document is created in my database, but not M:N relationship. What am I doing wrong? I tried to call flush after persisting, but it did not help at all.
#Entity
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#Column(name = "first_name")
private String firstName;
private String surname;
private String email;
private String password;
#ManyToMany
#JoinTable(
name = "users_roles",
joinColumns = #JoinColumn(
name = "user_id", referencedColumnName = "id"),
inverseJoinColumns = #JoinColumn(
name = "role_id", referencedColumnName = "id"))
private List<Role> roles;
#JsonIgnore
#ManyToMany
#JoinTable(
name="users_documents",
joinColumns = #JoinColumn(
name = "user_id", referencedColumnName = "id"),
inverseJoinColumns = #JoinColumn(
name="document_id", referencedColumnName = "id"))
private List<Document> usersDocuments;
#OneToMany(mappedBy="user")
private List<Document> sharedDocuments;
public User() {
}
public User(String firstName, String surname, String email, String password) {
this.firstName = firstName;
this.surname = surname;
this.email = email;
this.password = password;
}
public void setId(long id) {
this.id = id;
}
public long getId() {
return id;
}
public String getEmail() {
return email;
}
public void setEmail(String email){this.email = email;}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public void setRoles(List<Role> roles) {
this.roles = roles;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
public List<Role> getRoles() {
return roles;
}
public List<Document> getUsersDocuments() {
return usersDocuments;
}
public void setUsersDocuments(List<Document> usersDocuments) {
this.usersDocuments = usersDocuments;
}
public List<Document> getSharedDocuments() {
return sharedDocuments;
}
public void setSharedDocuments(List<Document> sharedDocuments) {
this.sharedDocuments = sharedDocuments;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof User)) return false;
User user = (User) o;
return getId() == user.getId();
}
#Override
public int hashCode() {
return Objects.hash(getId());
}
#Override
public String toString() {
return "User{" +
"firstName='" + firstName + '\'' +
", surname='" + surname + '\'' +
", email='" + email + '\'' +
", roles=" + roles +
'}';
}
}
My Document class:
#Entity
public class Document {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#Column(unique = true)
private String name;
private String title;
private String description;
#Column(name = "resource_path")
private String resourcePath;
#Column(name = "upload_datetime", columnDefinition = "DATETIME")
#Temporal(TemporalType.TIMESTAMP)
private Date uploadDatetime;
#ManyToMany(mappedBy = "usersDocuments")
private List<User> documentsForUsers;
#ManyToOne
#JoinColumn(name="user_id", nullable=false)
private User user;
public Document() {
}
public Document(String title, String description){
this.title = title;
this.description = description;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getResourcePath() {
return resourcePath;
}
public void setResourcePath(String resourcePath) {
this.resourcePath = resourcePath;
}
#Override
public String toString() {
return "Document{" +
"id=" + id +
", title='" + title + '\'' +
", description='" + description + '\'' +
", resourcePath='" + resourcePath + '\'' +
", uploadDatetime=" + uploadDatetime + '\'' +
". user=" + user;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof Document)) return false;
Document document = (Document) o;
return getId() == document.getId();
}
#Override
public int hashCode() {
return Objects.hash(getId());
}
public Date getUploadDatetime() {
return uploadDatetime;
}
public void setUploadDatetime(Date uploadDatetime) {
// Date startDate = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss").parse(uploadDatetime.toString());
this.uploadDatetime = uploadDatetime;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public List<User> getDocumentsForUsers() {
return documentsForUsers;
}
public void setDocumentsForUsers(List<User> documentsForUsers) {
this.documentsForUsers = documentsForUsers;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Perform this:
Optional<User> user = userService.getUserByEmail(createdBy);
Document document = new Document(title, desc);
document.setUploadDatetime(new Date());
document.setUser(user.get());
List<User> users = userService.getUsersByRoles(roles);
document.setDocumentsForUsers(users);
saveDocument(document);
#Override
public void saveDocument(Document document) {
entityManager.persist(document);
}

I think you need add the option to your #ManyToMany annotation: CascadeType.PERSIST.
By default, hibernate doesn't persists your relationship objects.
Try to use:
#ManyToMany(cascade = CascadeType.PERSIST)

Your class User is an Owner of relation #ManyToMany on
List<Document> usersDocuments;
as User has #JoinTable. Document class is an Inverse end.
If a Document is persisted then a data will be saved without relations. Because Inverse end cares only about itself but no relations.
By default you can persist a relation only from the owner side.
To be able to persist a relation from the inverse end then in your case as I tested:
In Document add cascade:
#ManyToMany(cascade = CascadeType.PERSIST, mappedBy = "usersDocuments")
private List<User> documentsForUsers;
and add a new code in your setter:
public void setDocumentsForUsers(List<User> documentsForUsers) {
if (documentsForUsers != null){
documentsForUsers.forEach(u -> {
u.getUsersDocuments().add(this); //here you should have not-null list u.getUsersDocuments()
});
}
this.documentsForUsers = documentsForUsers;
}
In User class add cascade:
#ManyToMany(cascade = CascadeType.PERSIST)
and
private List<Document> usersDocuments = new ArrayList<>();

How to Update list of entity to database

I have my entity class called employee and I want to soft delete my entity when I select and press delete button. I can able to select multiple employees as well, So in Java I used List of employee Entities and I want to update whole list into database table if I use merge of entityManager I can able to update only one row i.e only one entity so how do I solve this problem?
Here is some sample code.
#Entity
#Table(name="EmpInfo",schema="Auth")
public class EmpInfo{
#Id
#Column(name="EmpId")
private String userId;
#Column(name="EmailId")
private String emailId;
#Column(name="FirstName")
private String firstName;
#Column(name="LastName")
private String lastName;
#Column(name="MiddleName")
private String middleName;
#Column(name="UserAttributes")
private String userAttributes;
#Column(name="AddedDate")
private Timestamp addedDate;
#Column(name="ModifiedDate")
private Timestamp modifiedDate;
#Column(name="LastLoginDate")
private Timestamp lastLoginDate;
#Column(name="IsDeleted")
private int isDeleted;
#Column(name="AddedBy")
private String addedBy;
#Transient
private String addedByEmailId;
public String getAddedByEmailId() {
return addedByEmailId;
}
public void setAddedByEmailId(String addedByEmailId) {
this.addedByEmailId = addedByEmailId;
}
public EmpInfo() {
// TODO Auto-generated constructor stub
}
public EmpInfo(EmpInfo uInfo){
super();
this.userId=uInfo.userId;
this.emailId=uInfo.emailId;
this.firstName=uInfo.firstName;
this.lastName=uInfo.lastName;
this.middleName=uInfo.middleName;
this.userAttributes=uInfo.userAttributes;
this.addedDate=uInfo.addedDate;
this.lastLoginDate=uInfo.lastLoginDate;
this.modifiedDate=uInfo.modifiedDate;
this.addedBy=uInfo.addedBy;
this.roles=uInfo.roles;
}
public List<RoleName> getRoles() {
return roles;
}
public void setRoles(List<RoleName> roles) {
this.roles = roles;
}
public int getIsDeleted() {
return isDeleted;
}
public void setIsDeleted(int isDeleted) {
this.isDeleted = isDeleted;
}
public Date getAddedDate() {
return addedDate;
}
public void setAddedDate(Timestamp addedDate) {
this.addedDate = addedDate;
}
public Date getModifiedDate() {
return modifiedDate;
}
public void setModifiedDate(Timestamp modifiedDate) {
this.modifiedDate = modifiedDate;
}
public Date getLastLoginDate() {
return lastLoginDate;
}
public void setLastLoginDate(Timestamp lastLoginDate) {
this.lastLoginDate = lastLoginDate;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getEmailId() {
return emailId;
}
public void setEmailId(String emailId) {
this.emailId = emailId;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getMiddleName() {
return middleName;
}
public void setMiddleName(String middleName) {
this.middleName = middleName;
}
public String getUserAttributes() {
return userAttributes;
}
public void setUserAttributes(String userAttributes) {
this.userAttributes = userAttributes;
}
public String getAddedBy() {
return addedBy;
}
public void setAddedBy(String addedBy) {
this.addedBy = addedBy;
}
#Override
public String toString() {
return "EmpInfo [userId=" + userId + ", emailId=" + emailId + ", firstName=" + firstName + ", lastName="
+ lastName + ", middleName=" + middleName + ", userAttributes=" + userAttributes + ", addedDate="
+ addedDate + ", modifiedDate=" + modifiedDate + ", lastLoginDate=" + lastLoginDate + ", isDeleted="
+ isDeleted + ", addedBy=" + addedBy + "]";
}
}

public interface EmpInfoRepository extends JpaRepository<EmpInfo, String> {
}
use this to save list of entities as follows
#Autowired
private EmpInfoRepository empInfoRepository;
empInfoRepository.save(listOfEntity)
Since there is no custom implementation defined, implementation done by SimpleJpaRepository will be used, which will update the entities according to the #Id annotated field

Java Hot swap failed and schema change is not implemented

I work on a Java Spring boot app where I get the error of Hot-swap failed and schema change is not implemented and the operation is not supported by the VM. Afterward, the table is truncated and have no data at all.
I have 2 models provided below,
#Entity
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "name")
#NotNull
#NotEmpty
private String name;
#Column(name = "countryName")
#NotNull
#NotEmpty
private String countryName;
#Column(name = "currencyName")
#NotNull
#NotEmpty
private String currencyName;
/*
* total steps is for the keepign the history of the user movement
* */
#Column(name = "totalSteps")
#Min(value = 0L, message = "The value must be positive")
private int totalSteps;
/*
* current steps is for providing the user reward. We will need to set
* it to zero after processing the user payment
* */
#Column(name = "currentSteps")
#Min(value = 0L, message = "The value must be positive")
private int currentSteps;
#OneToMany(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
private List<RewardList> rewardLists = new ArrayList<>();
public User() {
}
public User(#NotNull #NotEmpty String name, #NotNull #NotEmpty String countryName) {
this.name = name;
this.countryName = countryName;
}
public User(#NotNull #NotEmpty String name, #NotNull #NotEmpty String countryName, #Min(value = 0L, message = "The value must be positive") int totalSteps) {
this.name = name;
this.countryName = countryName;
this.totalSteps = totalSteps;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCountryName() {
return countryName;
}
public String getCurrencyName() {
return currencyName;
}
public void setCurrencyName(String currencyName) {
this.currencyName = currencyName;
}
public void setCountryName(String countryName) {
this.countryName = countryName;
}
public int getTotalSteps() {
return totalSteps;
}
public void setTotalSteps(int totalSteps) {
this.totalSteps = totalSteps;
}
public int getCurrentSteps() {
return currentSteps;
}
public void setCurrentSteps(int currentSteps) {
this.currentSteps = currentSteps;
}
public List<RewardList> getRewardLists() {
return rewardLists;
}
public void setRewardLists(RewardList rl) {
this.rewardLists.add(rl);
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof User)) return false;
User user = (User) o;
return getTotalSteps() == user.getTotalSteps() &&
getCurrentSteps() == user.getCurrentSteps() &&
getId().equals(user.getId()) &&
getName().equals(user.getName()) &&
getCountryName().equals(user.getCountryName()) &&
getRewardLists().equals(user.getRewardLists());
}
#Override
public int hashCode() {
return Objects.hash(getId(), getName(), getCountryName(), getTotalSteps(), getCurrentSteps(), getRewardLists());
}
#Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", countryName='" + countryName + '\'' +
", totalSteps=" + totalSteps +
", currentSteps=" + currentSteps +
'}';
}
}
#Entity
public class RewardList {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "reward")
#Min(value = 0L, message = "The value must be positive")
private double reward;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "user_id", nullable = false)
private User user;
public RewardList() {
}
public RewardList(User user) {
this.user = user;
}
public RewardList(#Min(value = 0L, message = "The value must be positive") double reward) {
this.reward = reward;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public double getReward() {
return reward;
}
public void setReward(double reward) {
this.reward = reward;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof RewardList)) return false;
RewardList list = (RewardList) o;
return Double.compare(list.getReward(), getReward()) == 0 &&
getId().equals(list.getId()) &&
getUser().equals(list.getUser());
}
#Override
public int hashCode() {
return Objects.hash(getId(), getReward(), getUser());
}
#Override
public String toString() {
return "RewardList{" +
"id=" + id +
", reward=" + reward +
", user=" + user +
'}';
}
}
The end-point where I have this issue provided below,
// $ curl -X PUT http://localhost:8080/api/v1/users/calculateReward?userId=1 | jq
#PutMapping("/calculateReward")
public ResponseEntity<Object> calculateReward(#RequestParam("userId") Long userId) {
Optional<User> optional = userService.findById(userId);
if (!optional.isPresent()) {
return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
}
User user = optional.get();
double reward = user.getCurrentSteps() * Parameters.REWARD_PER_STEPS_EUR;
RewardList list = new RewardList();
list.setUser(user);
list.setReward(reward);
rewardListService.save(list);
user.setCurrentSteps(0);
user.setRewardLists(list);
userService.save(user);
JSONObject json = new JSONObject();
double convertionRateToEuro = currencyMap.get(user.getCurrencyName());
double rewardConverted = reward * convertionRateToEuro;
json.put("name", user.getName());
json.put("currency", user.getCurrencyName());
json.put("reward", rewardConverted);
return ResponseEntity.status(HttpStatus.CREATED).body(json);
}
Does anyone know what is going on and can provide a solution?
Thank you.

I find the reason and below I provide a solution. We will need to save the models based on the hierarchy. HotSwap doesn't support adding methods or hierarchy changes as indicated by the error messages. It's the limitation of Java HotSwap, not IntelliJ IDEA. The proper way of code sequence will be,
User user = optional.get();
RewardList list = new RewardList();
list.setUser(user);
list.setReward(reward);
user.setCurrentSteps(0);
user.setRewardLists(list);
// first save the User
userService.save(user);
// Then, save the RewardList as it has one to many relations
rewardListService.save(list);

How to add a mongo id from one collection as a foreign key in another collection

In my Spring boot application, I have collection of Todos and a collection of Courses. In the view of the application, I return the collection of courses and display whatever course I need. The Todos are stored as 1 list which represents all the current Todos. What I would like to do is return a list of Todos for each course. So when the view is opened, the application would display the the course plus the individual todo list for that course.
Is there a way I can use the existing code to incorporate the new functionality. I have created the front end logic and would like to keep that. My initial idea was to add the the course id to the Todo.java, but that did not work.
Todo.java
#Document(collection="todos")
public class Todo {
#Id
private String id;
#NotBlank
#Size(max=250)
#Indexed(unique=true)
private String title;
private Boolean completed = false;
private Date createdAt = new Date();
public Todo() {
super();
}
public Todo(String title) {
this.title = title;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Boolean getCompleted() {
return completed;
}
public void setCompleted(Boolean completed) {
this.completed = completed;
}
public Date getCreatedAt() {
return createdAt;
}
public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}
#Override
public String toString() {
return String.format(
"Todo[id=%s, title='%s', completed='%s']",
id, title, completed);
}
}
TodoRepository.java
#Repository
public interface TodoRepository extends MongoRepository<Todo, String> {
public List<Todo> findAll();
public Todo findOne(String id);
public Todo save(Todo todo);
public void delete(Todo todo);
}
Courses
#Document(collection = "courses")
public class Courses {
#Id
private String id;
private String name;
private String lecturer;
private String picture;
private String video;
private String description;
private String enroled;
public Courses(){}
public Courses(String name, String lecturer, String picture, String video, String description,String enroled) {
this.name = name;
this.lecturer = lecturer;
this.picture = picture;
this.video = video;
this.description = description;
this.enroled = enroled;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLecturer() {
return lecturer;
}
public void setLecturer(String lecturer) {
this.lecturer = lecturer;
}
public String getPicture() {
return picture;
}
public void setPicture(String picture) {
this.picture = picture;
}
public String getVideo() {
return video;
}
public void setVideo(String video) {
this.video = video;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getEnroled() {
return enroled;
}
public void setEnroled(String enroled) {
this.enroled = enroled;
}
#Override
public String toString() {
return "Courses{" +
"id='" + id + "'" +
", name='" + name + "'" +
", lecturer='" + lecturer + "'" +
", description='" + description + "'" +
'}';
}
}

Found two representations of same collection hibernate exception

I have a Spring MVC application that handle Users and Structures that can hosts one or more User.
I'm using Hibernate for the persistence and I'm having some issues with the One-To-Many relation between User and Structure.
This is my User model:
#Entity
#Table(name="USERS")
public class User extends DatabaseEntity {
#Id #GeneratedValue
private Long id = 0L;
#Column
#NotEmpty
private String firstName;
#Column
private String lastName;
#Column
private Date birthDate;
#Column
private String nation;
#Column
private String town;
#Column
private String idNumber;
#Column(unique = true)
private String email;
#Column String resetPasswordToken = "";
#Column
private String password;
#Column
private String avatarUrl;
#Column #Enumerated(EnumType.STRING)
private Role role;
#ManyToOne
#JoinColumn(name = "STRUCTURE_ID")
#Cascade({CascadeType.DETACH})
private Structure structure;
public enum Role {
ADMINISTRATOR,
SPECIALIST,
PATIENT,
DOCTOR,
CARE_GIVER
}
public User() {
birthDate = new Date();
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public Date getBirthDate() {
return birthDate;
}
public void setBirthDate(Date birthDate) {
this.birthDate = birthDate;
}
public String getNation() {
return nation;
}
public void setNation(String nation) {
this.nation = nation;
}
public String getTown() {
return town;
}
public void setTown(String town) {
this.town = town;
}
public String getIdNumber() {
return idNumber;
}
public void setIdNumber(String idNumber) {
this.idNumber = idNumber;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getAvatarUrl() {
return avatarUrl;
}
public void setAvatarUrl(String avatarUrl) {
this.avatarUrl = avatarUrl;
}
public Role getRole() {
return role;
}
public void setRole(Role role) {
this.role = role;
}
public Set<Group> getGroups() {
return null;
}
public void setGroups(Set<Group> groups) {
}
public Set<Group> getCreatedGroups() {
return null;
}
public void setCreatedGroups(Set<Group> createdGroups) {
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Set<HangoutUser> getHangoutUsers() {
return null;
}
public void setHangoutUsers(Set<HangoutUser> hangoutUsers) {
}
public String getResetPasswordToken() {
return resetPasswordToken;
}
public void setResetPasswordToken(String resetPasswordToken) {
this.resetPasswordToken = resetPasswordToken;
}
public Group getStructure() {
return structure;
}
public void setStructure(Structure structure) {
this.structure = structure;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof User)) return false;
User user = (User) o;
if (!email.equals(user.email)) return false;
if (!id.equals(user.id)) return false;
return true;
}
#Override
public int hashCode() {
Long res = id;
if(id == null)
res = 0L;
int result = res.hashCode();
result = 31 * result + email.hashCode();
return result;
}
}
And this is my Structure model:
#Entity
#Table(name = "STRUCTURES")
public class Structure extends DatabaseEntity {
#Id #GeneratedValue
Long id = 0L;
#Column
String name;
#Column
String address;
#Column
String city;
#Column
String state;
#OneToMany(mappedBy = "structure", fetch = FetchType.EAGER)
#Cascade({CascadeType.DELETE})
Set<User> users = new HashSet<User>();
public Long getId()
{
return id;
}
public void setId(Long id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public String getAddress()
{
return address;
}
public void setAddress(String address)
{
this.address = address;
}
public String getCity()
{
return city;
}
public void setCity(String city)
{
this.city = city;
}
public String getState()
{
return state;
}
public void setState(String state)
{
this.state = state;
}
public Set<User> getUsers()
{
return this.users;
}
public void setUsers(Set<User> users)
{
this.users = users;
}
}
My issue is that when I try to find all the Users with the value STRUCTURE_ID evaluated, I get an Hibernate Exception, like this:
org.springframework.orm.hibernate3.HibernateSystemException: Found two representations of same collection: it.amtservices.livinglab.model.Group.users; nested exception is org.hibernate.HibernateException: Found two representations of same collection: it.amtservices.livinglab.model.Structure.users
at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:690) ...
What should I do to solve this problem? I have already tried many ways but nothing solved.
I paste the abstract repository implementation for the UsersRepository and StructureRepository:
#Transactional
public abstract class AbstractRepository<Model extends DatabaseEntity>
{
Logger logger = Logger.getLogger(this.getClass().getSimpleName());
#PersistenceContext
EntityManager em;
protected Class<Model> ModelClass;
protected List<Model> findBy(String parameterName, Object parameterValue)
{
Query q = em.createQuery("select t from " + ModelClass.getSimpleName() + " t where t." + parameterName + " = :" + parameterName);
q.setParameter(parameterName, parameterValue);
List<Model> results = null;
try
{
results = q.getResultList();
}
catch (Exception e)
{
return null;
}
return results;
}
protected List<Model> findBy(Map<String, Object> parameters)
{
String whereClause = "";
for (String key : parameters.keySet())
{
if (!whereClause.equals("")) whereClause += " and ";
whereClause += "t." + key + " = :" + key;
}
Query q = null;
try
{
q = em.createQuery("select t from " + ModelClass.getSimpleName() + " t where " + whereClause);
}
catch (Exception e)
{
e.printStackTrace();
}
for (String key : parameters.keySet())
{
q.setParameter(key, parameters.get(key));
}
List<Model> results = null;
try
{
results = q.getResultList();
}
catch (Exception e)
{
return null;
}
return results;
}
protected Model findOneBy(String parameterName, Object parameterValue)
{
List<Model> results = findBy(parameterName, parameterValue);
if (results != null && results.size() > 0) return results.get(0);
return null;
}
protected Model findOneBy(Map<String, Object> parameters)
{
List<Model> results = findBy(parameters);
if (results != null && results.size() > 0) return results.get(0);
return null;
}
public Model findOne(Long id)
{
return findOneBy("id", id);
}
public List<Model> findAll()
{
Query q = em.createQuery("select t from " + ModelClass.getSimpleName() + " t");
List<Model> results = null;
try
{
results = q.getResultList();
}
catch (Exception e)
{
return null;
}
return results;
}
public boolean save(Model model)
{
try
{
Model newModel = em.merge(model);
if (model.getId() == 0L) model.setId(newModel.getId());
}
catch (Exception e)
{
logger.error(ModelClass.getSimpleName() + "Repository: " + e.getMessage());
return false;
}
return true;
}
public void save(List<Model> models)
{
for (Model model : models)
{
save(model);
}
}
public void delete(Model model)
{
delete(model.getId());
}
public void delete(Long id)
{
beforeDelete(findOne(id));
try
{
Query q = em.createQuery("delete from " + ModelClass.getSimpleName() + " t where t.id = :id").setParameter("id", id);
q.executeUpdate();
}
catch (Exception e)
{
logger.error(ModelClass.getSimpleName() + "Repository: " + e.getMessage());
}
}
public void delete(Collection<Model> models)
{
for (Model model : models)
{
delete(model.getId());
}
}
public void deleteAll()
{
for (Model model : findAll())
{
delete(model);
}
}
public abstract void beforeDelete(Model model);
public List<Model> find(List<Long> ids)
{
List<Model> models = new ArrayList<Model>();
for (Long id : ids)
{
Model model = findOne(id);
if (model != null) models.add(model);
}
return models;
}
}
Thank you!