hibernate 入门

工程截图

1.jar包 和 hibernate配置文件 /src/hibernate.cfg.xml    , /src/log4j.properties   ,   /src/db.sql

<?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">
<hibernate-configuration>
    <session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver.class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost/study?useUnicode=true&amp;characterEncoding=UTF8</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>

        <!-- Enable Hibernate's automatic session conttext management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to show -->
        <property name="show_sql">true</property>

        <!-- Format SQL -->
        <property name="format_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">update</property>

        <mapping resource="de/bvb/domain/Student.hbm.xml"/>
        <mapping class="de.bvb.domain.Teacher"/>
    </session-factory>
</hibernate-configuration>

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c:%L - %m%n

### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=warn, stdout

#log4j.logger.org.hibernate=info
#log4j.logger.org.hibernate=debug

### log HQL query parser activity
#log4j.logger.org.hibernate.hql.ast.AST=debug

### log just the SQL
#log4j.logger.org.hibernate.SQL=debug

### log JDBC bind parameters ###
#log4j.logger.org.hibernate.type=info
#log4j.logger.org.hibernate.type=debug

### log schema export/update ###
log4j.logger.org.hibernate.tool.hbm2ddl=debug

### log HQL parse trees
#log4j.logger.org.hibernate.hql=debug

### log cache activity ###
#log4j.logger.org.hibernate.cache=debug

### log transaction activity
#log4j.logger.org.hibernate.transaction=debug

### log JDBC resource acquisition
#log4j.logger.org.hibernate.jdbc=debug

### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
#log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace

create database study DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

2.实体类

2.1基于配置 /src/de/bvb/domain/Student.java 和/src/de/bvb/domain/Student.hbm.xml

package de.bvb.domain;

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;
    }

}

<?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="de.bvb.domain.Student" table="_Student">
        <id name="id"></id>
        <property name="name"/>
        <property name="age"/>
    </class>
</hibernate-mapping>

2.2基于注解 /src/de/bvb/domain/Teacher.java

package de.bvb.domain;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Teacher {
    @Id
    private int id;
    private String name;
    private String title;

    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 String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

}

3.测试类 /src/de/bvb/test/Test1.java

package de.bvb.test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.junit.Test;

import de.bvb.domain.Student;
import de.bvb.domain.Teacher;

public class Test1 {
    @Test
    public void testStudent() {
        Student s = new Student();
        s.setId(1);
        s.setName("zhangsan");
        s.setAge(8);

        SessionFactory sessionFactory = new AnnotationConfiguration()
                .configure().buildSessionFactory();
        Session session = sessionFactory.getCurrentSession();
        session.beginTransaction();
        session.save(s);
        session.getTransaction().commit();
    }

    @Test
    public void testTeacher() {
        Teacher t = new Teacher();
        t.setId(1);
        t.setName("t1");
        t.setTitle("middle");

        SessionFactory sessionFactory = new AnnotationConfiguration()
                .configure().buildSessionFactory();
        Session session = sessionFactory.getCurrentSession();
        session.beginTransaction();
        session.save(t);
        session.getTransaction().commit();
    }
}

参考:  http://www.cnblogs.com/LonelyShadow/p/4800814.html#guying01sjcjhgn