How do I Code one entity into another? - mysql

Question

This is what my SQL tables look like:
CREATE TABLE IF NOT EXISTS `test`.`Families` (
`id` INT NOT NULL AUTO_INCREMENT,
`mother_id` INT DEFAULT NULL ,
`father_id` INT DEFAULT NULL ,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS `test`.`Parents` (
`id` INT NOT NULL AUTO_INCREMENT,
`first_name` VARCHAR(50) DEFAULT NULL,
`last_name` VARCHAR(50) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
And this is what my family entity looks like:
#Entity
#Table(name="Families")
public class Family implements Serializable {
#Id
#Column(name="id")
private String id;
#Column(name="mother_id")
private int mother;
#Column(name="father_id")
private int father;
}
Which is great and all, but I would really LOVE if I could do something like this (note I also have a Parent entity already defined):
#Entity
#Table(name="Families")
public class Family implements Serializable {
#Id
#Column(name="id")
private String id;
#OneToOne
#Column(name="mother_id")
private Parent mother;
#OneToOne
#Column(name="father_id")
private Parent father;
}
How could I go about making this happen?

Answer 1

Actually, Hibernate does everything for you.
You don't need to annotate columns with #Column which already have #OneToOne or other association annotations
If you want to use other than default foreign key(by default name consists of field + _id), you should use #JoinColumn annotation
#Entity
#Table(name="Families")
public class Family implements Serializable {
#Id
#Column(name="id")
private String id;
#OneToOne
#JoinColumn(name = "mother_idd")
private Parent mother;
#OneToOne
#JoinColumn(name = "father_idd")
private Parent father;
}