With JPA annoations, I want to reuse same embedded object like this:
@Entity
public class User {
@Embedded
public Address homeAddress;
@Embedded
public Address workAddress;
}
@Embeddable
public class Address {
public String code;
public String city;
...
}
I can specify SQL column names with @AttributeOverrides, @AttributeOverride and @Column, but it's verbos. Is it possible to specify just a prefix to add to each column for homeAddress and workAddress?
Thanks,
Xavier
If you would like to use multiple same Embedded
class. You have to do @AttributeOverrides
for all columns. Try as below;
Reference JPA AttributeOverrides
@Embeddable
public class Address {
private String state;
@Column(name = "zip_code")
private String zip;
}
@Entity(name = "Employee")
public class Employee implements Serializable {
@Embedded
@AttributeOverrides({
@AttributeOverride(name = "state", column = @Column(name = "province_1")),
@AttributeOverride(name = "zip", column = @Column(name = "postal_code_2"))
})
private Address address_1;
@Embedded
@AttributeOverrides({
@AttributeOverride(name = "state", column = @Column(name = "province_2")),
@AttributeOverride(name = "zip", column = @Column(name = "postal_code_2"))
})
private Address address_2;
}
My suggestion, if there are one or more Embedded
value in your Entity
. Try to use @CollectionTable
.
@CollectionTable(name = "EMPLOYEE_ADDRESS", joinColumns = @JoinColumn(name = "ADDRESS_ID"))
private List<Address> addressList;
Reference JPA CollectionTable
adding this works for me (i'm using hibernate as JPA provider though)
<property name="hibernate.implicit_naming_strategy" value="org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl" />
Have the same problem, here is the solution. Works perfect, prefixes field names with the name of embedded property (in your case homeAddress_ and workAddress_)
In 2022 (after 9 Years) @zaw-than-oo -s answer is still valid:-(.
This "Duplicate" answer is for reference if sombody wants to improve jpa-embedded.
Here is a working crossplatform example based on @zaw-than-oo -s answer with verbose java-jpa and easy to use android-room
@androidx.room.Entity
@javax.persistence.Entity
@javax.persistence.Inheritance(strategy = javax.persistence.InheritanceType.SINGLE_TABLE)
public class AppHardware {
@javax.persistence.Id
@javax.persistence.GeneratedValue(strategy = javax.persistence.GenerationType.AUTO)
@androidx.room.PrimaryKey(autoGenerate = true)
private int id;
// max is embedded without column renaming
@androidx.room.Embedded
@javax.persistence.Embedded
private ProfileCommon max;
// min is embedded with column renaming
@androidx.room.Embedded(prefix = "min")
@javax.persistence.Embedded
@javax.persistence.AttributeOverrides({
// Verbose: every persisted property in ProfileCommon needs an entry
// see https://stackoverflow.com/questions/12912063/jpa-multiple-embedded-fields-with-prefix
@AttributeOverride(name = "added", column = @Column(name = "minadded")),
@AttributeOverride(name = "apkName", column = @Column(name = "minapkName")),
@AttributeOverride(name = "versionCode", column = @Column(name = "minversionCode")),
@AttributeOverride(name = "versionName", column = @Column(name = "minversionName")),
@AttributeOverride(name = "size", column = @Column(name = "minsize"))
})
private ProfileCommon min;
// getter and setter onmitted
}
@javax.persistence.MappedSuperclass
public class ProfileCommon {
private long added; // date
private String apkName;
private long versionCode;
private String versionName;
private long size;
// getter and setter onmitted
}
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