JPA - @Embedded Examples

JPA JAVA EE

@Embedded annotation is used in the entity class. It is placed on a persistent field or property to link to an embeddable class. The embeddable class must be annotated with @Embeddable.

package com.logicbig.example;

import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class EntityA {
    @Id
    @GeneratedValue
    private int id;

    @Embedded
    private ClassA classARef;

    public ClassA getClassARef() {
        return classARef;
    }

    public void setClassARef(ClassA classARef) {
        this.classARef = classARef;
    }

    @Override
    public String toString() {
        return "EntityA{" +
                "id=" + id +
                ", classARef=" + classARef +
                '}';
    }
}

Original Post

package com.logicbig.example;

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

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

    public String getMyStrB() {
        return myStrB;
    }

    public void setMyStrB(String myStrB) {
        this.myStrB = myStrB;
    }

    public ClassA getClassARef() {
        return classARef;
    }

    public void setClassARef(ClassA classARef) {
        this.classARef = classARef;
    }

    @Override
    public String toString() {
        return "ClassB{" +
                "myStrB='" + myStrB + '\'' +
                ", classARef=" + classARef +
                '}';
    }
}

Original Post

package com.logicbig.example;

import javax.persistence.*;

@Entity
public class EntityA {
    @Id
    @GeneratedValue
    private int id;

    @AttributeOverrides({
            @AttributeOverride(name = "myStr", column = @Column(name = "MY_STR_COL1")),
            @AttributeOverride(name = "myInt", column = @Column(name = "MY_INT_COL1"))
    })
    @Embedded
    private ClassA classARef;

    @AttributeOverrides({
            @AttributeOverride(name = "myStr", column = @Column(name = "MY_STR_COL2")),
            @AttributeOverride(name = "myInt", column = @Column(name = "MY_INT_COL2"))
    })
    @Embedded
    private ClassA classARef2;

    public ClassA getClassARef() {
        return classARef;
    }

    public void setClassARef(ClassA classARef) {
        this.classARef = classARef;
    }

    public ClassA getClassARef2() {
        return classARef2;
    }

    public void setClassARef2(ClassA classARef2) {
        this.classARef2 = classARef2;
    }

    @Override
    public String toString() {
        return "EntityA{" +
                "id=" + id +
                ", classARef=" + classARef +
                ", classARef2=" + classARef2 +
                '}';
    }
}

Original Post

package com.logicbig.example;

import javax.persistence.*;

@Entity
public class EntityA {
    @Id
    @GeneratedValue
    private int id;

    @Embedded
    @AttributeOverrides({
            @AttributeOverride(name = "myStr", column = @Column(name = "MY_STR_COL1"))
    })
    @AssociationOverrides({
            @AssociationOverride(
                    name = "entityBRef", joinColumns = @JoinColumn(name = "EntityAB_JOIN1"))
    })
    private ClassA classARef;

    @Embedded
    @AttributeOverrides({
            @AttributeOverride(name = "myStr", column = @Column(name = "MY_STR_COL2"))
    })
    @AssociationOverrides({
            @AssociationOverride(
                    name = "entityBRef", joinColumns = @JoinColumn(name = "EntityAB_JOIN2"))
    })
    private ClassA classARef2;

    public ClassA getClassARef() {
        return classARef;
    }

    public void setClassARef(ClassA classARef) {
        this.classARef = classARef;
    }

    public ClassA getClassARef2() {
        return classARef2;
    }

    public void setClassARef2(ClassA classARef2) {
        this.classARef2 = classARef2;
    }

    @Override
    public String toString() {
        return "EntityA{" +
                "id=" + id +
                ", classARef=" + classARef +
                ", classARef2=" + classARef2 +
                '}';
    }
}

Original Post

JPA - @Embedded Examples

See Also