Hibernate insert automatic number in a column

Question

Hello brothers and sisters,

I have a class that keeps userAuthInformatin with authuserid column,username column, and authusertoken column.

I want to insert uuid number in authusertoken column with every insert. I learned about Generated(GenerationTime.INSERT) but i don't know exact way to do this.

package entities; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.Table; import org.hibernate.annotations.Generated; import org.hibernate.annotations.GenerationTime; @Entity @Table(name = "authusers") public class AuthUser { @Id @GeneratedValue private int authuserid; @Generated(GenerationTime.INSERT) @Column(name = "authusertoken") private long authusertoken; @Column(name = "username") private String username; public int getAuthuserid() { return authuserid; } public void setAuthuserid(int authuserid) { this.authuserid = authuserid; } public long getAuthusertoken() { return authusertoken; } public void setAuthusertoken(long authusertoken) { this.authusertoken = authusertoken; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } }

Vlad Mihalcea · Accepted Answer · 2014-08-07 12:02:57Z

1

You can simply use the UUID Java class and assign a value to this token field at object creation time:

@Column(name = "authusertoken", columnDefinition = "BINARY(16)") private UUID authusertoken = UUID.randomUUID();

If the current associated row already has a value, when fetching the Entity, Hibernate will set it using Reflection and override the authusertoken with the row's column value.

If this is a new object, the authusertoken will get a default UUID when the object is instantiated.

edited Aug 7, 2014 at 12:02

answered Aug 7, 2014 at 9:44

Vlad Mihalcea

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4 Comments

Ali Arda Orhan Over a year ago

It looks like, it would be good solution. Can you explain the part of Reflection and override the authusertoken?

Amogh Over a year ago

@user3137442, I guess @VladMihalcea wants to say that if an object already have value of authusertoken in DB then at the time of fetching Hibernate will override the DB value to authusertoken.

Ali Arda Orhan Over a year ago

when i use this solution. It gives me error that says UUID is not applicable for arguments int?

Ali Arda Orhan Over a year ago

Also using private UUID authusertoken = UUID.randomUUID().toString(); solves storing string problem.

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