Hibernate operation Oracle database primary key auto increment

 

 Believed to have been used mysql,sql server,oracle Our friends all know ,oracle If you want to set the primary key of the table in to self growth , Then you need to create a sequence 

 stay oracle In Chinese, it means 


create table Student(
 Student_ID  number(6) NOT NULL PRIMARY KEY,
 Student_Name varchar2(10) NOT NULL,
 Student_Age number(2) NOT NULL
);
 
CREATE SEQUENCE student_sequence 
INCREMENT BY 1
NOMAXVALUE
NOCYCLE
CACHE 10;
 
insert into Student values(student_sequence.nextval,'aa',20);
 A piece of data will be saved and inserted in the database id by (2,aa,20) The data of 
 With this knowledge and hibernate Operation on Database , We can start writing code 

 Uncommented version student JavaBean Class is 


package com.bean;
 
public class Student
{
    private int student_id;
    private String student_name;
    private int student_age;
   
    public int getStudent_id()
    {
        return student_id;
    }
    public String getStudent_name()
    {
        return student_name;
    }
    public int getStudent_age()
    {
        return student_age;
    }
    public void setStudent_id(int id)
    {
        this.student_id = id;
    }
    public void setStudent_name(String name)
    {
        this.student_name = name;
    }
    public void setStudent_age(int age)
    {
        this.student_age = age;
    }
}
 Corresponding student.hbm.xml File core code 

<class name="Student" table="Student">         
        <id name="student_id" column="student_id" type="java.lang.Integer">             
            <generator class="native">         
                <param name="sequence">student_sequence</param>
            </generator>
        </id>         
        <property name="student_name" column="Student_Name" type="java.lang.String"/>
        <property name="student_age" column="Student_Age" type="java.lang.Integer"/>
    </class>
 Annotated entity class code 

package com.bean;
 
import javax.persistence.*;
 
@Entity
@Table(name="student")
public class StudentAnnotation {
    private int student_id;
    private String student_name;
    private int student_age;
   
    @Id
    @SequenceGenerator(name="generator",sequenceName="student_sequence")
    @GeneratedValue(strategy=GenerationType.SEQUENCE,generator="generator")
    /*@Id
    @GenericGenerator(name = "idGenerator", strategy = "native")
    @GeneratedValue(generator = "idGenerator")   Some netizens said that this method can also , But it's actually wrong */
    public int getStudent_id()
    {
        return student_id;
    }
    
    @Column
    public String getStudent_name()
    {
        return student_name;
    }
    
    @Column
    public int getStudent_age()
    {
        return student_age;
    }
    public void setStudent_id(int id)
    {
        this.student_id = id;
    }
    public void setStudent_name(String name)
    {
        this.student_name = name;
    }
    public void setStudent_age(int age)
    {
        this.student_age = age;
    }
}
 Of course , The configuration file hibernate.cfg.xml The code is as follows ,oracle The database for 11g

<hibernate-configuration>
<session-factory>		
	<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><!-- Database connection url-->
	<property name="connection.url">jdbc:oracle:thin:@127.0.0.1:orcl</property>
    	<property name="connection.username">go</property>
    	<property name="connection.password">go</property>
    	<property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
    	<!-- <mapping resource="com/bean/Student.hbm.xml"/> -->	<!--  Use *.hbm.xml Please keep this line , Otherwise, note  -->
    	<mapping class="com.bean.StudentAnnotation" /> <!--  Please keep this line for annotation , Otherwise, note  -->
</session-factory>
</hibernate-configuration>
 Finally, the test class 

package com.test;
 
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
//import com.bean.Student;   // No comment 
import com.bean.StudentAnnotation;   // There are notes 
 
public class Test {
	public static void main(String[] args) {
		try {
			SessionFactory sf = new Configuration().configure().buildSessionFactory();
			Session session = sf.openSession();        
			Transaction tx = session.beginTransaction();  
 
			StudentAnnotation stu = new StudentAnnotation();    // There are notes 
			//Student stu = new Student();    // No comment 
 
			stu.setStudent_name("zhangsan");
			stu.setStudent_age(18);     
			session.save(stu);
			tx.commit();		
			session.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}
 After testing , There should be... In the database zhagnsan Student information 
 The database driver tested is ojdbc-14 Version of , When it comes to testing , There will be a INFO Information ,

INFO: HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException

 Can be ignored , On the Internet ojdbc-6 There's no problem with the new version , Positive solution , But the data in the database is 

https://blog.csdn.net/thepeakofmountain/article/details/17173715