Hibernate_HelloWord

Hibernate操作步骤

1.新建项目2.加jar包3.写xml配置文件hibernate.cfg.xml4.写log4j.PRoperties日志文件5.在MySQL数据库中建student表6.建Student实体类(先建表后建类)7.写XML映射文件Student.hbm.xml，或者Annotation映射语句8.在hibernate.cfg.xml中添加相应mapping9.写测试类main，或者Junit测试类(项目右键-->“New”-->“Junit Test Case”)

HelloWorld小程序----XML映射文件

1.新建项目

2.加jar包。此处列出的jar包是Hibernate所需的全部jar包，在此项目中并不是全部需要

将如下jar包封装进一个User Library，名为hibernateantlr-2.7.6.jarc3p0-0.9.1.jarcommons-collections-3.1.jardom4j-1.6.1.jarhibernate3.jarhibernate-annotations.jarhibernate-commons-annotations.jarhibernate-jpa-2.0-api-1.0.0.Final.jarjavassist-3.12.0.GA.jarjta-1.1.jarjunit-4.10.jarlog4j-1.2.14.jarmysql-connector-java-5.1.7-bin.jarslf4j-api-1.6.1.jarslf4j-log4j12-1.6.1.jar

3.hibernate.cfg.xml配置文件。其中<mapping/>在步骤8中设置

<?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>        <!-- Database connection settings -->        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>        <property name="connection.url">jdbc:mysql://localhost/test</property>        <property name="connection.username">root</property>        <property name="connection.password">root</property>        <!-- JDBC connection pool 连接池 -->        <!-- <property name="connection.pool_size">1</property> -->        <!-- SQL dialect 方言-->        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>        <!-- 当前session上下文 . thread:当前线程;jta:(java transaction api) -->        <property name="current_session_context_class">thread</property>         <!-- Disable the second-level cache 去掉二级缓存 -->        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>        <!-- Echo all executed SQL to stdout 显示sql语句-->        <property name="show_sql">true</property>        <!-- Drop and re-create the database schema on startup 常用选项：create和update -->        <property name="hbm2ddl.auto">update</property>        <mapping resource="com/hibernate/model/Student.hbm.xml"/>        <!-- <mapping class="com.hibernate.model.Student"/> -->            </session-factory></hibernate-configuration>

4.log4j.properties日志文件

### direct log messages to stdout ###log4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.Target=System.outlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%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

5.在数据库中建表

建表可以在数据库中手动建，也可以通过运行程序自动建立。

此处自动建表

6.建Student实体类

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;}}

7.Student.hbm.xml映射文件

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping><class name="com.hibernate.model.Student" dynamic-update="true"><id name="id"><generator class="native"></generator>   <!-- generator设置其id自增 --></id>                                        <!-- id指的是相应表的主键 --><property name="name"></property><property name="age"></property></class></hibernate-mapping>

8.在hibernate.cfg.xml中添加相应mapping

9.写测试类main

public class StudentTest {public static void main(String[] args) {Student s = new Student();s.setName("s3");s.setAge(10);SessionFactory sf = new Configuration().configure().buildSessionFactory();Session session = sf.getCurrentSession();session.beginTransaction();session.save(s);session.getTransaction().commit();sf.close();}}

程序到此结束，运行后，会自动在数据库创建student表，并将对象s存入student表中。

HelloWorld小程序----Annotation映射语句

步骤1-5同上

6,7.建实体类，添加Annotation注解

@Entity   //表示这是一个实体类，和数据库中的某个表是对应的public class Teacher {private int id;private String name;private int age;@Id                //主键@GeneratedValue    //ID生成策略，默认为AUTOpublic 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;}}

8.在hibernate.cfg.xml中添加相应mapping，如下

<mapping class="com.hibernate.model.Student"/>

9.写测试类

测试类有很多种方式

a)见上文测试类main

b)创建一个HibernateUtil辅助类 ，然后再建测试类main

public class HibernateUtil {private static SessionFactory sf = buildSessionFactory();private static SessionFactory buildSessionFactory() {return new Configuration().configure().buildSessionFactory();}public static SessionFactory getSessionFactory() {return sf;}}

public class StudentTest {public static void main(String[] args) {Student s = new Student();s.setName("lisi");s.setAge(18);SessionFactory sf = HibernateUtil.getSessionFactory();Session session = sf.getCurrentSession();session.beginTransaction();session.save(s);session.getTransaction().commit();sf.close();}}

c)建Junit测试类

项目右键-->“New”-->“Junit Test Case”，输入类名，然后完善test方法

public class StudentTest_Junit {private static SessionFactory sf = null;@BeforeClasspublic static void beforeClass(){sf = new Configuration().configure().buildSessionFactory();}@AfterClasspublic static void afterClass(){sf.close();}@Testpublic void test() {Student s = new Student();s.setName("wangwu");s.setAge(23);Session session = sf.getCurrentSession();session.beginTransaction();session.save(s);session.getTransaction().commit();}}

程序到此结束，运行后，会自动在数据库创建student表，并将对象s存入student表中。