Hibernate (2) Quick Start

One, the first example

    1. Import Hibernate's necessary development Jar packages and database-driven Jar packages        

            Ø  antlr-2.7.7.jar  - Hql parsing tool

            Ø  dom4j-1.6.1.jar  - XML ​​configuration file reading tool

            Ø  hibernate-commons-annotations-4.0.2.Final.jar  - Hibernate annotation package

            Ø  hibernate-core-4.2.4.Final.jar  - Hibernate core package

            Ø  hibernate-jpa-2.0-api-1.0.1.Final.jar  - complete dependency package of javaBean mapping table  

            Ø  javassist-3.15.0-GA.ja  - code generation package that extends Java classes and implementations at runtime

            Ø  jboss-logging-3.1.0.GA.jar  - logging tool

            Ø  jboss-transaction-api_1.1_spec-1.0.1.Final.jar  - transaction tool

            Ø  mysql-connector-java-5.1.7-bin.jar   -mysql driver

    2. Build and hibernate.cfg.xml configuration file      

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 
<hibernate-configuration>
    <session-factory>
        <!-- The path and name of the class used to specify the database connection driver -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <!-- Used to specify the url address to connect to the database -->
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate</property>
        <!-- Username to connect to the database -->
        <property name="hibernate.connection.username">root</property>
        <!-- Password to connect to the database-->
        <property name="hibernate.connection.password">root</property>
        <!-- The dialect of the SQL statement used when connecting to the database -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <!-- Whether the HIbernate framework will automatically create the database form or modify the form according to the mapping file when it is working-->
        <property name="hibernate.hbm2ddl.auto">update</property>
        <!-- In order to facilitate our observation of HIBERNATE work, then we also need to manually add the following two configurations -->
        <!-- Automatically output SQL statements-->
         <property name="show_sql">true</property>
         <!-- formatted output sql -->
         <property name="format_sql">true</property>
         
         <!-- Register the mapping file with hibernate-->
        <mapping resource="com/hibernate/domain/User.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

3, create a database table

CREATE TABLE user_infor (
  id int(11) unsigned NOT NULL AUTO_INCREMENT,
  name varchar(50) NOT NULL,
  code varchar(20) NOT NULL,
  age int(3) DEFAULT NULL,
  PRIMARY KEY (id)
 )

4. Create the entity object of the database table

public class UserInfor {
	private Integer id;
	private String name;
	private String code;
	private Integer age;
	
	public UserInfor() {		
	}
	
	public UserInfor(String name, String code,Integer age) {
		super();
		this.name = name;
		this.code = code;
		this.age=age;
	}
}

5. Create a mapping file between entity classes and database tables

<?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>
    <class name="com.hibernate.demo.pojo.UserInfor" table="user_infor" catalog="hibernate">
        <id name="id" type="integer" column="id">
            <generator class="native" />
        </id>
        <property name="name" type="string" column="name" />
        <property name="code" type="string" column="code" />
        <property name="age" type="integer" column="age" />
    </class>
</hibernate-mapping>

6. Register the mapping file of the fifth step in the hibernate.cfg.xml file

<hibernate-configuration>
    <session-factory>
       。。。。
  
         <!-- Register the mapping file with hibernate-->
        <mapping resource="com/hibernate/demo/pojo/UserInfor.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

7. Create a test class

public class TestUser {
	@Test
	public void testAdd(){
		//1. Load configuration hibernate.cfg.xml
		Configuration cfg = (new Configuration()).configure();
		//2. Create a factory class SessionFactory
		SessionFactory factory = cfg.buildSessionFactory();
		//3. Create a session object for operation
		Session session = factory.openSession();
		//4. Create an entity class
		UserInfor user = new UserInfor("zhangsan","0011",12);
		//5. Start transaction
		Transaction tx = session.beginTransaction();
		//6. Save data
		session.save(user);
		//7. Commit the transaction.
		tx.commit();
		//8. Close the connection
		session.close();		
	}
}