hibernate 在数据库端设置默认值的正确方法

Question

I'm new to hibernate, and I'm looking for the correct approach to set a default value on database side.

I hope the DDL generated by hibernate is equivalent to this:

create table SpaceGroup (
        name varchar(255) not null, 
        isProtected boolean default FALSE not null, 
        primary key (name)
)

Here is my entity declaration:

@Entity
@DynamicInsert
public class SpaceGroup {
    @Id
    private String name;
    @ColumnDefault("FALSE")
    @Column(nullable = false)
    private Boolean isProtected;
}

the problem with this approach is that hibernate didn't realize there is a db default value, so when I insert object it complains I do not give a value for a not null field:

org.hibernate.PropertyValueException: not-null property references a null or transient value : com.ziqi.models.SpaceGroup.isProtected

even adding a @DynamicInsert can not solve this issue

why hibernate not able to infer this field will be given a default value on database side ? I believe @DynamicInsert is not even need if I understand it correctly.

Answer 1

You can simply initialize the variable and it sets that value as the default. @Column(nullable = false) private Boolean isProtected = false;

Else, you can use columnDefinition property of the @Column annotation, for example:

@Column(columnDefinition=“boolean default false") private Boolean isProtected;