如何在Hibernate注释中创建Tinyint Field

Question

I have problem in creating tinyint field in MySQL database using Hibernate.

I used to write the Entity class like this

@Entity

@Table(name="tablename")

public class MyEntity {

private int id;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="id")
public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

}

And when I check MySQL, id field always end up with Integer(11) , how do I make it as TinyInt ?

Any answer would be appreciated

Answer 1

I think there are a few ways of doing this. The first is to use the columnDefinition attribute on the @Column annotation to read something like this:

@Column(name = "id", columnDefinition = "TINYINT")

This is not portable across databases and does not align well with the variable itself being an int. A byte or short may be needed here

Another way is to use the @Type annotation, probably with org.hibernate.type.ByteType since it seems to represent a TINYINT ( link to javadoc ).

I hope this helps.

Answer 2

如果从bean中的注释创建模式，则可以尝试使用@Column批注中的columnDefinition属性来定义要执行的SQL。

Answer 3

将int更改为byte或Byte，无需其他注释