搭建hibernate环境 使用JDBC连接数据库

搭建hibernate环境 使用JDBC连接数据库

1.新建一个java项目（测试用）

2.导入hibernate所需的jar包

// hibernate所需jar包
antlr-2.7.7.jar
dom4j-1.6.1.jar
hibernate-commons-annotations-4.0.5.Final.jar
hibernate-core-4.3.11.Final.jar
hibernate-jpa-2.1-api-1.0.0.Final.jar
jandex-1.1.0.Final.jar
javassist-3.18.1-GA.jar
jboss-logging-3.1.3.GA.jar
jboss-logging-annotations-1.2.0.Beta1.jar
jboss-transaction-api_1.2_spec-1.0.0.Final.jar

// 连接mysql数据库驱动包
mysql-connector-java-5.1.20-bin.jar

3.配置hibernate.cfg.xml文件：

放在src下目录下

文件的获取：在jar包：hibernate-release-版本号.Final\project\etc 目录下

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<!-- mysql配置数据库连接 -->
<property name="connection.driver_class">
org.gjt.mm.mysql.Driver
</property>
<property name="connection.url">jdbc:mysql:///hibernate4</property>
<property name="connection.username">root</property>
<property name="connection.password">123456</property>

<!-- hibernate可选项 -->
<!-- 数据库文言 -->
<property name="dialect">
org.hibernate.dialect.MySQL5Dialect
</property>
<!-- 是否打印sql语句 -->
<property name="show_sql">true</property>
<!-- 格式化sql语句 -->
<property name="format_sql">true</property>
<!-- hbm文件 -->
<mapping resource="cn/hibernate/entity/score.hbm.xml" />
</session-factory>
</hibernate-configuration>

4.配置映射文件 xxx.hbm.xml文件：

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.hibernate.entity">
<class name="Score">
<id name="id">
<generator class="native"></generator>
</id>

<property name="stuId"/>
<property name="subjectId"/>
<property name="result"/>
</class>
</hibernate-mapping>

5.HibernateUitl工具类：

package cn.hibernate.util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;

/**
* hibernate工具类
* @author tang
*
*/
public class HibernateUitl {

private static Configuration cfg = null;
private static SessionFactory factory = null;
private static Session session = null;

static {
cfg = new Configuration().configure();
factory = cfg.buildSessionFactory(new StandardServiceRegistryBuilder().applySettings(cfg.getProperties())
.build());
}

public static Session getSession() {
if(factory != null) {
return factory.openSession();
}else{
factory = cfg.buildSessionFactory(new StandardServiceRegistryBuilder().applySettings(cfg.getProperties())
.build());
}
return factory.openSession();
}

public static void closeSession() {
if(session != null && session.isOpen()){
session.close();
}
}
}

6.添加对应映射文件（xxx.hbm.xml）的实体类：

// 实体类
public class Score {
private int id;
private int stuId;//学生编号
private int subjectId;//科目编号
private double result;//成绩
// 省略 getter 和 setter 方法
}

7.测试类：

public class HibernateTest {

@Test
public void createDB() {
Configuration cfg = new Configuration().configure();
SchemaExport se = new SchemaExport(cfg);
//第一个参数是否生成ddl脚本，第二个参数是否执行到数据库中
se.create(true, true);
}

@Test
public void sqlSave() throws Exception {
Session session = null;
Transaction tx = null;
try {
session = HibernateUitl.getSession();
tx = session.beginTransaction();

Score s = new Score();
s.setId(1);
s.setSubjectId(2);
s.setResult(89);

session.save(s);

tx.commit();
} catch (Exception e) {
if(tx != null)
tx.rollback();
e.printStackTrace();
throw e;
}finally{
HibernateUitl.closeSession();
}
}
}