java - 在 Hibernate 映射中 : how to set default value?

Question

In my project i want to set default value of three columns i'm using this code in x.hbm.xml file:

<property name="occupation" type="string">
        <column name="occupation" length="20" not-null="false" default="Not Provided" />
    </property><property name="address" type="string">
        <column name="address" length="150" not-null="false" default="Not Provided"  />
    </property><property name="contact" type="string">
        <column name="contact" length="15" not-null="false" default="Not Provided" />
    </property>

when all three values are not provided by user then only first(occupation) is set to default value others not.. or more then one field is not provided then only one column get default value other not..

Answer 1

我尝试使用注释。

@Column(name = "colName", insertable=false, updatable = false, nullable = false, 
        columnDefinition = "varchar(255) default '14-APR-1981'") 

或者您可以使用@PrePersist注释

@PrePersist
public void prePersist() {
if(myProperty == null) //We set default value in case if the value is not set yet.
    myProperty = "Default value";
}