I had tables like Customer, Request and so on and each had ID field;
I have now an abstract
#MappedSuperclass instead that have
#Id
#GeneratedValue
private Long id
field, and all tables extends it with
#AttributeOverride(name="id", column=#Column(name="ID_CUSTOMER"). but now, when I'm trying to add customer to a table, I'm getting exception: Column ID_Customer cannot accept Null value.
when each table had it's own id fields, all works fine.
what's wrong?
Thanks
#MappedSuperclass
public abstract class GeneralEntity implements Serializable,Cloneable{
#Id
#GeneratedValue
#Column(name = "ID")
private Long id;
#Column(name = "CREATED",nullable = false)
#Temporal(TemporalType.TIMESTAMP)
private Date created;
#Column(name = "MODIFIED")
#Temporal(TemporalType.TIMESTAMP)
private Date modified;
//getters,setters
#Entity
#Table(name = "CUSTOMER")
#AttributeOverrides({
#AttributeOverride(name = "id", column = #Column(name="ID_CUSTOMER")),
#AttributeOverride(name="created", column=#Column(name="CUSTOMER_REGISTERED",nullable = false))
})
public class Customer extends GeneralEntity{
// #Column(name = "ID_CUSTOMER")
// #Id
// #GeneratedValue
// private Long id;
#Column(name = "CUSTOMER_EMAIL", nullable = false, length = 25, unique = true, updatable = true)
private String email;
#Column(name="CUSTOMER_PASSWORD", nullable = false)
private String password;
//getters setters
Related
I am using queryDSL to fetch the inner collection of data and failed to do so. My entities are
#Entity
#Table(name = "countries")
#Setter
#Getter
public class Country {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long countryId;
#Column(name = "name")
private String name;
#Column(name = "data")
private String data;
#OneToOne(mappedBy = "country")
private State stateJoin;
}
#Entity
#Table(name = "states")
#Setter
#Getter
public class State {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long stateId;
#Column(name = "name")
private String name;
#Column(name = "count")
private String count;
#Column(name = "co_id")
private Long countryId;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "co_id", referencedColumnName = "id", updatable = false, insertable = false)
private Country country;
#OneToMany(cascade = CascadeType.ALL)
#JoinColumn(name = "state_id", referencedColumnName = "id")
private Set<Town> towns;
}
#Entity
#Table(name = "towns")
#Setter
#Getter
public class Town {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "town_id")
private Long townId;
#Column(name = "name")
private String name;
#Column(name = "people_count")
private String peopleCount;
#Column(name = "st_id")
private Long stateId;
}
and in querydsl i am trying below query and always failing to retrieve inner collection towns
List<Expression> childGroup = new ArrayList<>();
query.from(countries);
childGroup.addAll(Arrays.asList(countries.name, countries.data, countries.stateJoin));
query.join(countries.stateJoin, State);
childGroup.add(Projections.bean(State.class, name, count, town)
.as((Path) countries.stateJoin));
OR
childGroup.add(Projections.bean(State.class, name, count, list(town)).as((Path) countries.stateJoin));
query.select(fields);
query.where();
final Map<? extends Number, ? extends Object> t =
(Map<? extends Number, ? extends Object>)
query
.limit(pageRequest.getPageSize())
.offset(pageRequest.getOffset())
.distinct()
.transform(
GroupBy.groupBy(groupByPath)
.as(Projections.bean(Countris.class, childGroup.toArray(new Expression[0]))));
while executing the above line exactly i am getting always SQLSyntax error as i see the underlying SQL is with
. as towns
Can some one help me how to read the nested collection formed by JPA join?
I have Company entity:
#Entity
#Data
public class Company {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "company_id", nullable = false, unique = true)
private int companyId;
#Column(name = "name", nullable = false, length = 255, unique = true)
private String name;
#JsonIgnore
#OneToMany (mappedBy = "company")
private List<Employee> employeeList;
}
And Employee entity:
#Entity
#Data
public class Employee {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "employee_id", nullable = false, unique = true)
private int employeeId;
#Column(name = "employee_name", nullable = false)
private String name;
#ManyToOne(optional = false)
#JoinColumn(name = "company_id", nullable = false)
private Company company;
}
I have trouble when I'm mapping EmployeeRequest to Employee object.
This is EmployeeRequest:
#Data
public class EmployeeRequest {
private String name;
private int companyId;
}
As you can see here in request I have companyId which is integer and therefore I have error.
My mapper:
#Component
public class EmployeeMapper {
private Mapper mapper = DozerBeanMapperBuilder.buildDefault();
public Employee transformToEmployeeEntity(EmployeeRequest employeeRequest) {
return mapper.map(employeeRequest, Employee.class);
}
}
I think it makes sense to have an integer as data type in EmployeeRequest. So what is proper way to solve this?
I hae 2 simple entities: Student and Class. I want to POST a student, where I specify the class it belongs to, but I've got stuck in hibernate mapping.
ClassModel.class
#Entity
#Table(name = "class" )
public class ClassModel implements Serializable {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#NotEmpty
#Size(max = 20)
#Column(name = "name")
private String name;
#Column(name = "tables")
private int tables;
#Column(name = "chairs")
private int chairs;
#Column(name = "teacher")
private String teacher;
(getters + setters)
StudentModel
#Entity
#Table(name = "student")
public class StudentModel implements Serializable {
#Id
#Column(name = "student_id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int student_id;
#NotEmpty
#Column(name = "name")
#Size(max = 50)
private String name;
#Column(name = "age")
private int age;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "id")
private ClassModel classModel;
(getters + setters)
}
StudentController.java
...
#Autowired
private StudentService studentService;
#Autowired
private ClassService classService;
#PostMapping(value = "/save")
public StudentModel save(#RequestBody StudentModel studentModel){
ClassModel classModel = classService.findById(studentModel.getClassId()).get();
studentModel.setClassModel(classModel);
return studentService.save(studentModel);
}
...
But when I make a request from Postman with the following body:
{
"name": "some name",
"age": 12,
"class_id": 1
}
I get the following error from hibernate:
Column 'class_id' cannot be null
Where is the mistake in my hibernate mapping?
It's how I have made working join in hibernate. Have a look:
TrainingEntity.java
#Id
private Integer id;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "animal_id", nullable = false, insertable = false, updatable = false)
private AnimalEntity animalEntity;
#Column(name = "animal_id")
private Integer animalId;
AnimalEntity.java
#Id
private Integer id;
#OneToMany(mappedBy = "animalEntity", fetch = FetchType.LAZY)
private List<TrainingEntity> trainingEntityList = new ArrayList<>();
So here is the join between AnimalEntity and TrainingEntity.
AnimalEntity have a list of TrainingEntities.
The mistake is in this line:
"class_id": 1
You're using column name instead of field name. You would have to replace class_id with classModel, where classModel would be an object. Other solution would be to find ClassModel by id from json and set it as parent to StudentModel.
I have 2 entities:
#Entity
#Table(name = "wpf_payment_attributes")
public class WpfPaymentAttributes implements Serializable {
private static final long serialVersionUID = -2629784870868584850L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id", unique = true, updatable = false, nullable = false)
private int id;
#Column(length = 32)
private Integer wpf_payment_id;
#Column(length = 255)
private String name;
....
}
Second entity:
#Entity
#Table(name = "wpf_payments")
public class WpfPayments implements Serializable {
private static final long serialVersionUID = -5740164339503774805L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id", unique = true, updatable = false, nullable = false)
private int id;
#Column(length = 4)
private Integer merchant_id;
.....
}
id is generated by the DB. I use this code to insert some data:
WpfPayments obj = new WpfPayments();
obj.setReference_transaction_id(12345678);
obj.setContract_id(contract.getId());
obj.setMerchant_id(merchant.getId());
wpfPaymentsService.saveOrUpdate(obj);
WpfPaymentAttributes attibutes = new WpfPaymentAttributes();
attibutes.setName("usage");
attibutes.setValue("Test Usage");
attibutes.setWpf_payment_id(...get here some how WpfPayments table id...id);
wpfPaymentAttributesService.saveOrUpdate(attibutes);
Do you know how I can get the id from the WpfPayments object and save it using attibutes.setWpf_payment_id(...)?
You should use JoinTable attributes with a setter to the entity instead of the id of WpfPayments.
The Id of WpfPayments is generated once you call the save method on the repository of this entity, just use the result of it.
I have a many-to-many relationship which looks like this:
The primary key is combination of three columns and I'm using eclipselink. I created these classes to be able to insert in the join-table :
#Entity
#Table(name = "definition_property")
#NamedQueries({
#NamedQuery(name = "DefinitionProperty.findAll", query = "SELECT d FROM DefinitionProperty d")})
public class DefinitionProperty extends AbstractEntity{
private static final long serialVersionUID = 1L;
#EmbeddedId
protected DefinitionPropertyPK pk;
#JoinColumn(name = "dtid", referencedColumnName = "id", insertable = false, updatable = false)
#ManyToOne(optional = false)
private DefinitionType definitionType;
#JoinColumn(name = "prid", referencedColumnName = "id", insertable = false, updatable = false)
#ManyToOne(optional = false)
private Property property;
#Column(name = "initial_value")
#Basic(optional = false)
private String initialValue;
// setters and getters
}
And PK class:
#Embeddable
public class DefinitionPropertyPK implements Serializable{
#Column(name = "dtid")
private Integer idDt;
#Column(name = "prid")
private Integer idProperty;
#Column(name = "initial_value")
private String initialValue;
//hashcode, equals, setters and getters
}
Entitiy 1:
#Entity
#Table(name = "definition_type")
public class DefinitionType extends AbstractEntity implements EntityItem<Integer> {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Basic(optional = false)
#Column(name = "id")
private Integer idDT;
#Size(max = 45)
#Column(name = "name")
private String dtName;
#Size(max = 45)
#Column(name = "description")
private String description;
#OneToMany(cascade=CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "definitionType")
private List<DefinitionProperty> definitionProperties = new ArrayList<DefinitionProperty>();
}
Entity 2:
#Entity
#Table(name = "property")
public class Property extends AbstractEntity implements EntityItem<Integer>{
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.SEQUENCE)
#Basic(optional = false )
#Column(name = "id")
private Integer idProperty;
#Column(name = "name")
#Size(max = 45)
private String propertyName;
#Enumerated(EnumType.STRING)
#Column(name = "type")
private Type fieldType;
#Column(name = "init_value")
#Size(max = 45)
private String initialValue;
#OneToMany(cascade=CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "property")
private List<DefinitionProperty> definitionPeoperties= new ArrayList<DefinitionProperty>();
}
Exception : I get this exception when trying to persist a new DefinitionType:
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.microsoft.sqlserver.jdbc.SQLServerException: The column name 'initial_value' is specified more than once in the SET clause. A column cannot be assigned more than one value in the same SET clause. Modify the SET clause to make sure that a column is updated only once. If the SET clause updates columns of a view, then the column name 'initial_value' may appear twice in the view definition.
Error Code: 264
Call: INSERT INTO definition_property (initial_value, initial_value, dtid, prid) VALUES (?, ?, ?, ?)
bind => [4 parameters bound]
Question : Why there are two initial_values in the set clause and where am I wrong in my code?
Ref: How do you Set Up a Many-to-Many Relationship with Junction Table using JPA/EclipseLink
Ref: JPA simple many-to-many with eclipselink
Ref: https://giannigar.wordpress.com/2009/09/04/mapping-a-many-to-many-join-table-with-extra-column-using-jpa/