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JPA - @Embeddable Examples

JPA JAVA EE 


@Embeddable annotation is used on a class whose instances are stored as a part of an owning entity. Each of the persistent properties or fields of the embedded object is mapped to the database table for the owner entity.


package com.logicbig.example;

import javax.persistence.Embeddable;

@Embeddable
public class ClassA {
    private String myStr;
    private int myInt;

    public String getMyStr() {
        return myStr;
    }

    public void setMyStr(String myStr) {
        this.myStr = myStr;
    }

    public int getMyInt() {
        return myInt;
    }

    public void setMyInt(int myInt) {
        this.myInt = myInt;
    }

    @Override
    public String toString() {
        return "ClassA{" +
                "myStr='" + myStr + '\'' +
                ", myInt=" + myInt +
                '}';
    }
}
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@Entity
public class MyEntity {
    @Id
    @GeneratedValue
    private int id;

    @Embedded
    private ClassB classBRef;
    .............
}

Using @Embedded in an @Embeddable:

package com.logicbig.example;

import javax.persistence.Embeddable;
import javax.persistence.Embedded;

@Embeddable
public class ClassB {
    private String myStrB;
    @Embedded
    private ClassA classARef;
    .............
}

@Embeddable
public class ClassA {
    private String myStr;
    private int myInt;
    .............
}
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@Embeddable with @ManyToOne relationship 

package com.logicbig.example;

import javax.persistence.Embeddable;
import javax.persistence.ManyToOne;

@Embeddable
public class ClassA {
    private String myStr;

    @ManyToOne
    private EntityB entityBRef;

    public String getMyStr() {
        return myStr;
    }

    public void setMyStr(String myStr) {
        this.myStr = myStr;
    }

    public EntityB getEntityBRef() {
        return entityBRef;
    }

    public void setEntityBRef(EntityB entityBRef) {
        this.entityBRef = entityBRef;
    }

    @Override
    public String toString() {
        return "ClassA{" +
                "myStr='" + myStr + '\'' +
                ", entityBRef=" + entityBRef +
                '}';
    }
}
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@Embeddable
public class PhoneNumber {
    private String phoneNumber;
    @Enumerated(EnumType.STRING)
    private PhoneType type;
    .............
}

@Entity
public class Customer {
    @Id
    @GeneratedValue
    private int id;
    private String name;
    @ElementCollection
    private List<PhoneNumber> phoneNumbers;
    .............
}
public enum PhoneType {
    House, Work, Cell
}
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See Also