Hibernate (1)

1. What is hibernate?

Hibernate is an open-source framework used to encapsulate the data access layer. It is called a data access layer framework (or a persistent layer framework)

Previously, we used JDBC/SQL statements to access/operate data from the database. hibernate encapsulates this write operation, which is specially used for the component technology of the data access layer.

Ii. Required jar packages

Hibernate: hibernate3.jar

Antlr-2.7.6.jar

Commons-collections-3.1.jar

Dom4j-1.6.1.jar

Javassist-3.9.0.GA.jar

Jta-1.1.jar

Slf4j-api-1.5.8.jar

Server Load balancer: slf4j-nop-1.5.8.jar

JDBC: mysql-connector-java-5.1.16-bin.jar

3. Create a database and a table

create database hibernate;create table student (id int primary key,name varchar(20),age int);

4. Prepare the hibernate configuration file

This file is used to store the link information of the database and the configuration information of hibernate. It is named hibernate. cfg. xml.

<? Xml version = '1. 0' encoding = 'utf-8'?> <! DOCTYPE hibernate-configuration PUBLIC "-// Hibernate/Hibernate Configuration DTD 3.0 // EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <! -- Associate the photo Printing file -->
<Mapping resource = "org/hibernate/tutorial/domain/Event. hbm. xml"/> </session-factory> 
5. Create entity Student
package com.xxx.model;public class Student {    private int id;    private String name;    private int age;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }}
Create the Print Object of Student: student. hbm. xml
<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
Modify the associated Printing file in hibernate. cfg. xml
<mapping resource="com/xxx/model/Student.hbm.xml"/>
 
Then you can create a test class StudentTest.
package com.xxx.test;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;import com.liguobing.model.Student;public class StudentTest {    public static void main(String[] args) {        Student s = new Student();        s.setId(1);        s.setName("SSS");        s.setAge(40);        Configuration cfg = new Configuration();        SessionFactory sf = cfg.configure().buildSessionFactory();        Session session = sf.openSession();        Transaction t = session.getTransaction();        t.begin();        session.save(s);        t.commit();        session.close();    }}
Run it and you will see it on the console.

Check the database