Description of MySQL ing of MySQL auto-increment fields in hibernate

The following articles mainly introduce the ing of MySQL auto-incrementing fields in hibernate and examples of its actual application code. The following articles describe the actual operations, I hope it will help you learn the ing of MySQL auto-increment fields in hibernate.

 
 

  
  
create table `anietest`.`user`(  
  
  
`id` int not null auto_increment,  
  
  
`username` varchar(50),  
  
  
primary key (`id`)  
  
  
);  
  
  
create unique index `PRIMARY` on `anietest`.`user`(`id`);  
 
 

The above MySQL table ing file is

 
 

  
  
 
  
<class name="org.nieweiguo.User" table="user" catalog="anietest"> 
  
  
<id name="id" type="java.lang.Integer"> 
  
  
<column name="id" /> 
  
  
<generator class="native" /> 
  
  
</id> 
  
  
<property name="username" type="java.lang.String"> 
  
  
<column name="username" length="50" /> 
  
  
</property> 
  
  
</class> 
  
  
 
 

In this way, when inserting data in the ACTION, you do not need to set the value of the model ID, however, if you change <generator class = "native"/> to <generator class = "assigned"/>, you must set the ID value to 0 in the ACTION, in this way, the MySQL field will still be the MySQL auto-incrementing Field

ACTION Code:

 
 

  
  
UserForm userForm = (UserForm) form;// TODO Auto-generated method stub  
  
  
UserDAO userDao=new UserDAO();  
  
  
User user=new User();  
  
  
//user.setId(0); class="assigned"  
 
 

You can set the value to 0 or a greater value.

 
 

  
  
user.setUsername(userForm.getUsername());  
  
  
userDao.save(user); 
 
 

The above content is an introduction to the ing of MySQL auto-increment fields in hibernate. I hope you will have some gains.