Hibernate从增主键

Hibernate自增主键

Hibernate自增主键(oracle数据库)可以通过序列来实现。

(1)创建表person和序列person_sequence

 

-----建表-------
create table person(
  id number(10) primary key,
  name varchar2(10) not null,
  age number(3) 
)
-----建序列-----
CREATE SEQUENCE person_sequence 
INCREMENT BY 1 
START WITH 1 
NOMAXVALUE 
NOCYCLE 
CACHE 10; 

 (2)src下新建demo包，包中新建person的pojo类。

 (3)person.java同目录下新建Person.hbm.xml

 

<?xml version="1.0" encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
                            "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                            "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="demo">

    <class name="Person" table="person">
        <id name="id" column="ID" type="int">
         <generator class="native">
           <param name="sequence">person_sequence</param>
         </generator>        
        </id>

        <property name="name" column="NAME" type="string"  not-null="true" />
        <property name="age" column="AGE" type="int" />
    </class>
    
</hibernate-mapping>

 按照这样的配置即可以实现主键的自增。