Hi
An entity X has a list of entity Y and the entity Y has an instance of entity Z.
The relation between X to Y is OneToMany and the relation between Y to Z is ManyToOne.
I want to retrieve X and have all the associated entities retrieved with them as well.
What HQL query do I write so that I get the whole chain retrieved all at once. At present its hibernateTemplate.find("from X"). or What annonations do I use for it?
X=ServiceProvider, Y=BusinessLocations.java, Z=State.java
I have the entities annotated below and I am having the whole chain persisted into database but when i try to retrieve the list of Y(BusinessLocation), I get
nothing.
What do I do join X with Y and Y with Z?
Below are the entities x, Y and Z.
ServiceProvider.java
@Entity
public class ServiceProvider implements Serializable{
private Long id;
private Set<BusinessLocation> businessLocations = new HashSet<BusinessLocation>();
@Id
@GeneratedValue
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@OneToMany(mappedBy="serviceProvider", targetEntity=BusinessLocation.class, cascade=CascadeType.ALL, fetch=FetchType.EAGER)
public Set<BusinessLocation> getBusinessLocations() {
return businessLocations;
}
public void setBusinessLocations(Set<BusinessLocation> businessLocations) {
this.businessLocations = businessLocations;
}
public boolean equals(Object obj) {
if(!(obj instanceof ServiceProvider)) return false;
ServiceProvider other = (ServiceProvider) obj;
return new EqualsBuilder().append(businessLocations, other.businessLocations).isEquals();
}
}
BusinessLocation.java
@Entity
public class BusinessLocation implements Serializable{
private Long id;
private String address;
private String city;
private State state;
private String pincode;
private ServiceProvider serviceProvider;
public BusinessLocation() {
}
@Id
@GeneratedValue
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
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;
}
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="state_id")
public State getState() {
return state;
}
public void setState(State state) {
this.state = state;
}
public void setPincode(String pincode) {
this.pincode = pincode;
}
public String getPincode() {
return pincode;
}
@ManyToOne
@JoinColumn(name="serviceProvider_id")
public ServiceProvider getServiceProvider() {
return serviceProvider;
}
public void setServiceProvider(ServiceProvider serviceProvider) {
this.serviceProvider = serviceProvider;
}
public boolean equals(Object obj) {
if( !(obj instanceof BusinessLocation)) return false;
BusinessLocation other = (BusinessLocation) obj;
return new EqualsBuilder().append(address, other.address).append(city, other.city).append(state, other.state).append(pincode,
other.pincode).append(serviceProvider, other.serviceProvider).isEquals();
}
public int hashCode() {
return new HashCodeBuilder().append(address).append(city).append(state).append(pincode).append(serviceProvider).toHashCode();
}
}
State.java
@Entity
public class State implements Serializable {
private Long id;
private String abbreviatedName;
private String name;
private List<BusinessLocation> businessLocations;
@Id
@GeneratedValue
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getAbbreviatedName() {
return abbreviatedName;
}
public void setAbbreviatedName(String abbreviatedName) {
this.abbreviatedName = abbreviatedName;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
@OneToMany(mappedBy="state", targetEntity=BusinessLocation.class, cascade=CascadeType.ALL, fetch=FetchType.EAGER)
public List<BusinessLocation> getBusinessLocations() {
return businessLocations;
}
public void setBusinessLocations(List<BusinessLocation> businessLocations) {
this.businessLocations = businessLocations;
}
public boolean equals(Object obj) {
if(! (obj instanceof State)) return false;
State other = (State) obj;
return new EqualsBuilder().append(abbreviatedName, other.abbreviatedName).append(name, other.name).append(businessLocations,
other.businessLocations).isEquals();
}
public int hashCode() {
return new HashCodeBuilder().append(name).append(abbreviatedName).append(businessLocations).toHashCode();
}
}
Could someone help me out here?
Thanks