hibernate框架入门
2016-10-11 20:16
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1、在IDE中创建java项目(比较简单不再演示)
2、创建source folder,命名为Hibernate3,在Hibernate下载文件中找到我们所需要的三个配置文件和所有jar包,拷贝所需jar文件,构建依赖包
3、提供hibernate.cfg.xml文件,完成基本配置
4、写代码
(1)建立实体类User.java
[java] view
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print?
package com.liang.hibernate;
import java.util.Date;
public class User {
private String id;
private String name;
private String password;
private Date createTime;
private Date expireTime;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getExpireTime() {
return expireTime;
}
public void setExpireTime(Date expireTime) {
this.expireTime = expireTime;
}
}
(2)提供User.hbm.xml文件,完成实体类映射
[html] view
plain copy
print?
<span style="font-size:12px;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!--生成默认为user的数据库表-->
<class name="com.liang.hibernate.User">
<id name="id">
<!-- 算法的核心思想是结合机器的网卡、当地时间、一个随机数来生成GUID -->
<generator class="uuid"></generator>
</id>
<property name="name"></property>
<property name="password"></property>
<property name="createTime" type="date"></property>
<property name="expireTime" type="date"></property>
</class>
</hibernate-mapping></span>
(3)将User.hbm.xml文件加入到hibernate.cfg.xml文件中
[html] view
plain copy
print?
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 设置数据库驱动 -->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<!-- 设置数据库URL -->
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_first</property>
<!-- 数据库用户名 -->
<property name="hibernate.connection.username">root</property>
<!-- 数据库密码 -->
<property name="hibernate.connection.password">123456</property>
<!-- 指定对应数据库的方言,hibernate为了更好适配各种关系数据库,针对每种数据库都指定了一个方言dialect -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 映射文件 -->
<mapping resource="com/liang/hibernate/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>
(4)编写工具类ExportDB.java,将hbm生成ddl,也就是hbm2ddl
[java] view
plain copy
print?
package com.liang.hibernate;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
/**
* 将hbm生成ddl
* @author liang
*
*/
public class ExportDB{
public static void main(String[]args){
//默认读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
////生成并输出sql到文件(当前目录)和数据库
SchemaExport export = new SchemaExport(cfg);
export.create(true, true);
}
}
测试之前,要提前建立数据库hibernate_first,测试如下:
控制台打印的SQL语句:
[sql] view
plain copy
print?
drop table if exists User
create table User (id varchar(255) not null, name varchar(255), password varchar(255), createTime date, expireTime date, primary key (id))
数据库表结构:
(5)建立客户端类Client,添加用户数据到mySQL
[java] view
plain copy
print?
package com.liang.hibernate;
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Client {
public static void main(String[]args){
//读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
//建立SessionFactory
SessionFactory factory =cfg.buildSessionFactory();
//取得session
Session session = null;
try{
//开启session
session = factory.openSession();
//开启事务
session.beginTransaction();
User user = new User();
user.setName("jiuqiyuliang");
user.setPassword("123456");
user.setCreateTime(new Date());
user.setExpireTime(new Date());
//保存User对象
session.save(user);
//提交事务
session.getTransaction().commit();
}catch(Exception e){
e.printStackTrace();
//回滚事务
session.getTransaction().rollback();
}finally{
if(session != null){
if(session.isOpen()){
//关闭session
session.close();
}
}
}
}
}
右键debug运行,测试完成之后,我们查询一下测试结果:
5、为了在调试过程中能观察到Hibernate的日志输出,最好加入log4j.properties配置文件、在CLASSPATH中新建log4j.properties配置文件或将该配置文件拷贝到src下,便于程序调试。
内容如下:
[html] view
plain copy
print?
<span style="font-size:12px;">### 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{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</span>
配置完成后,项目结构如下图所示:
从上面的简单实例可以看到,我们只是使用Hibernate对User这一个实体进行了映射,比较简单,但是完全不符合实际。如何像关系型数据库一样表示多种关联关系,例如:一对一,一对多,多对多等等,我们还需要深入。下篇博文,我们介绍Hibernate的基本映射原理以及关联关系映射。
1、在IDE中创建java项目(比较简单不再演示)
2、创建source folder,命名为Hibernate3,在Hibernate下载文件中找到我们所需要的三个配置文件和所有jar包,拷贝所需jar文件,构建依赖包
3、提供hibernate.cfg.xml文件,完成基本配置
4、写代码
(1)建立实体类User.java
[java] view
plain copy
print?
package com.liang.hibernate;
import java.util.Date;
public class User {
private String id;
private String name;
private String password;
private Date createTime;
private Date expireTime;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getExpireTime() {
return expireTime;
}
public void setExpireTime(Date expireTime) {
this.expireTime = expireTime;
}
}
(2)提供User.hbm.xml文件,完成实体类映射
[html] view
plain copy
print?
<span style="font-size:12px;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!--生成默认为user的数据库表-->
<class name="com.liang.hibernate.User">
<id name="id">
<!-- 算法的核心思想是结合机器的网卡、当地时间、一个随机数来生成GUID -->
<generator class="uuid"></generator>
</id>
<property name="name"></property>
<property name="password"></property>
<property name="createTime" type="date"></property>
<property name="expireTime" type="date"></property>
</class>
</hibernate-mapping></span>
(3)将User.hbm.xml文件加入到hibernate.cfg.xml文件中
[html] view
plain copy
print?
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 设置数据库驱动 -->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<!-- 设置数据库URL -->
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_first</property>
<!-- 数据库用户名 -->
<property name="hibernate.connection.username">root</property>
<!-- 数据库密码 -->
<property name="hibernate.connection.password">123456</property>
<!-- 指定对应数据库的方言,hibernate为了更好适配各种关系数据库,针对每种数据库都指定了一个方言dialect -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 映射文件 -->
<mapping resource="com/liang/hibernate/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>
(4)编写工具类ExportDB.java,将hbm生成ddl,也就是hbm2ddl
[java] view
plain copy
print?
package com.liang.hibernate;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
/**
* 将hbm生成ddl
* @author liang
*
*/
public class ExportDB{
public static void main(String[]args){
//默认读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
////生成并输出sql到文件(当前目录)和数据库
SchemaExport export = new SchemaExport(cfg);
export.create(true, true);
}
}
测试之前,要提前建立数据库hibernate_first,测试如下:
控制台打印的SQL语句:
[sql] view
plain copy
print?
drop table if exists User
create table User (id varchar(255) not null, name varchar(255), password varchar(255), createTime date, expireTime date, primary key (id))
数据库表结构:
(5)建立客户端类Client,添加用户数据到mySQL
[java] view
plain copy
print?
package com.liang.hibernate;
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Client {
public static void main(String[]args){
//读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
//建立SessionFactory
SessionFactory factory =cfg.buildSessionFactory();
//取得session
Session session = null;
try{
//开启session
session = factory.openSession();
//开启事务
session.beginTransaction();
User user = new User();
user.setName("jiuqiyuliang");
user.setPassword("123456");
user.setCreateTime(new Date());
user.setExpireTime(new Date());
//保存User对象
session.save(user);
//提交事务
session.getTransaction().commit();
}catch(Exception e){
e.printStackTrace();
//回滚事务
session.getTransaction().rollback();
}finally{
if(session != null){
if(session.isOpen()){
//关闭session
session.close();
}
}
}
}
}
右键debug运行,测试完成之后,我们查询一下测试结果:
5、为了在调试过程中能观察到Hibernate的日志输出,最好加入log4j.properties配置文件、在CLASSPATH中新建log4j.properties配置文件或将该配置文件拷贝到src下,便于程序调试。
内容如下:
[html] view
plain copy
print?
<span style="font-size:12px;">### 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{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</span>
配置完成后,项目结构如下图所示:
从上面的简单实例可以看到,我们只是使用Hibernate对User这一个实体进行了映射,比较简单,但是完全不符合实际。如何像关系型数据库一样表示多种关联关系,例如:一对一,一对多,多对多等等,我们还需要深入。下篇博文,我们介绍Hibernate的基本映射原理以及关联关系映射。
2、创建source folder,命名为Hibernate3,在Hibernate下载文件中找到我们所需要的三个配置文件和所有jar包,拷贝所需jar文件,构建依赖包
3、提供hibernate.cfg.xml文件,完成基本配置
4、写代码
(1)建立实体类User.java
[java] view
plain copy
print?
package com.liang.hibernate;
import java.util.Date;
public class User {
private String id;
private String name;
private String password;
private Date createTime;
private Date expireTime;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getExpireTime() {
return expireTime;
}
public void setExpireTime(Date expireTime) {
this.expireTime = expireTime;
}
}
(2)提供User.hbm.xml文件,完成实体类映射
[html] view
plain copy
print?
<span style="font-size:12px;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!--生成默认为user的数据库表-->
<class name="com.liang.hibernate.User">
<id name="id">
<!-- 算法的核心思想是结合机器的网卡、当地时间、一个随机数来生成GUID -->
<generator class="uuid"></generator>
</id>
<property name="name"></property>
<property name="password"></property>
<property name="createTime" type="date"></property>
<property name="expireTime" type="date"></property>
</class>
</hibernate-mapping></span>
(3)将User.hbm.xml文件加入到hibernate.cfg.xml文件中
[html] view
plain copy
print?
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 设置数据库驱动 -->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<!-- 设置数据库URL -->
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_first</property>
<!-- 数据库用户名 -->
<property name="hibernate.connection.username">root</property>
<!-- 数据库密码 -->
<property name="hibernate.connection.password">123456</property>
<!-- 指定对应数据库的方言,hibernate为了更好适配各种关系数据库,针对每种数据库都指定了一个方言dialect -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 映射文件 -->
<mapping resource="com/liang/hibernate/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>
(4)编写工具类ExportDB.java,将hbm生成ddl,也就是hbm2ddl
[java] view
plain copy
print?
package com.liang.hibernate;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
/**
* 将hbm生成ddl
* @author liang
*
*/
public class ExportDB{
public static void main(String[]args){
//默认读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
////生成并输出sql到文件(当前目录)和数据库
SchemaExport export = new SchemaExport(cfg);
export.create(true, true);
}
}
测试之前,要提前建立数据库hibernate_first,测试如下:
控制台打印的SQL语句:
[sql] view
plain copy
print?
drop table if exists User
create table User (id varchar(255) not null, name varchar(255), password varchar(255), createTime date, expireTime date, primary key (id))
数据库表结构:
(5)建立客户端类Client,添加用户数据到mySQL
[java] view
plain copy
print?
package com.liang.hibernate;
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Client {
public static void main(String[]args){
//读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
//建立SessionFactory
SessionFactory factory =cfg.buildSessionFactory();
//取得session
Session session = null;
try{
//开启session
session = factory.openSession();
//开启事务
session.beginTransaction();
User user = new User();
user.setName("jiuqiyuliang");
user.setPassword("123456");
user.setCreateTime(new Date());
user.setExpireTime(new Date());
//保存User对象
session.save(user);
//提交事务
session.getTransaction().commit();
}catch(Exception e){
e.printStackTrace();
//回滚事务
session.getTransaction().rollback();
}finally{
if(session != null){
if(session.isOpen()){
//关闭session
session.close();
}
}
}
}
}
右键debug运行,测试完成之后,我们查询一下测试结果:
5、为了在调试过程中能观察到Hibernate的日志输出,最好加入log4j.properties配置文件、在CLASSPATH中新建log4j.properties配置文件或将该配置文件拷贝到src下,便于程序调试。
内容如下:
[html] view
plain copy
print?
<span style="font-size:12px;">### 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{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</span>
配置完成后,项目结构如下图所示:
五、最后
自己动手丰衣足食,实践出真理,纸上得来终觉浅,绝知此事要躬行。虽然这个实例非常简单,但是我们踏进了持久层框架的大门。从上面的简单实例可以看到,我们只是使用Hibernate对User这一个实体进行了映射,比较简单,但是完全不符合实际。如何像关系型数据库一样表示多种关联关系,例如:一对一,一对多,多对多等等,我们还需要深入。下篇博文,我们介绍Hibernate的基本映射原理以及关联关系映射。
1、在IDE中创建java项目(比较简单不再演示)
2、创建source folder,命名为Hibernate3,在Hibernate下载文件中找到我们所需要的三个配置文件和所有jar包,拷贝所需jar文件,构建依赖包
3、提供hibernate.cfg.xml文件,完成基本配置
4、写代码
(1)建立实体类User.java
[java] view
plain copy
print?
package com.liang.hibernate;
import java.util.Date;
public class User {
private String id;
private String name;
private String password;
private Date createTime;
private Date expireTime;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getExpireTime() {
return expireTime;
}
public void setExpireTime(Date expireTime) {
this.expireTime = expireTime;
}
}
(2)提供User.hbm.xml文件,完成实体类映射
[html] view
plain copy
print?
<span style="font-size:12px;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!--生成默认为user的数据库表-->
<class name="com.liang.hibernate.User">
<id name="id">
<!-- 算法的核心思想是结合机器的网卡、当地时间、一个随机数来生成GUID -->
<generator class="uuid"></generator>
</id>
<property name="name"></property>
<property name="password"></property>
<property name="createTime" type="date"></property>
<property name="expireTime" type="date"></property>
</class>
</hibernate-mapping></span>
(3)将User.hbm.xml文件加入到hibernate.cfg.xml文件中
[html] view
plain copy
print?
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 设置数据库驱动 -->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<!-- 设置数据库URL -->
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_first</property>
<!-- 数据库用户名 -->
<property name="hibernate.connection.username">root</property>
<!-- 数据库密码 -->
<property name="hibernate.connection.password">123456</property>
<!-- 指定对应数据库的方言,hibernate为了更好适配各种关系数据库,针对每种数据库都指定了一个方言dialect -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 映射文件 -->
<mapping resource="com/liang/hibernate/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>
(4)编写工具类ExportDB.java,将hbm生成ddl,也就是hbm2ddl
[java] view
plain copy
print?
package com.liang.hibernate;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
/**
* 将hbm生成ddl
* @author liang
*
*/
public class ExportDB{
public static void main(String[]args){
//默认读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
////生成并输出sql到文件(当前目录)和数据库
SchemaExport export = new SchemaExport(cfg);
export.create(true, true);
}
}
测试之前,要提前建立数据库hibernate_first,测试如下:
控制台打印的SQL语句:
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drop table if exists User
create table User (id varchar(255) not null, name varchar(255), password varchar(255), createTime date, expireTime date, primary key (id))
数据库表结构:
(5)建立客户端类Client,添加用户数据到mySQL
[java] view
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package com.liang.hibernate;
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Client {
public static void main(String[]args){
//读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
//建立SessionFactory
SessionFactory factory =cfg.buildSessionFactory();
//取得session
Session session = null;
try{
//开启session
session = factory.openSession();
//开启事务
session.beginTransaction();
User user = new User();
user.setName("jiuqiyuliang");
user.setPassword("123456");
user.setCreateTime(new Date());
user.setExpireTime(new Date());
//保存User对象
session.save(user);
//提交事务
session.getTransaction().commit();
}catch(Exception e){
e.printStackTrace();
//回滚事务
session.getTransaction().rollback();
}finally{
if(session != null){
if(session.isOpen()){
//关闭session
session.close();
}
}
}
}
}
右键debug运行,测试完成之后,我们查询一下测试结果:
5、为了在调试过程中能观察到Hibernate的日志输出,最好加入log4j.properties配置文件、在CLASSPATH中新建log4j.properties配置文件或将该配置文件拷贝到src下,便于程序调试。
内容如下:
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<span style="font-size:12px;">### 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{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</span>
配置完成后,项目结构如下图所示:
五、最后
自己动手丰衣足食,实践出真理,纸上得来终觉浅,绝知此事要躬行。虽然这个实例非常简单,但是我们踏进了持久层框架的大门。从上面的简单实例可以看到,我们只是使用Hibernate对User这一个实体进行了映射,比较简单,但是完全不符合实际。如何像关系型数据库一样表示多种关联关系,例如:一对一,一对多,多对多等等,我们还需要深入。下篇博文,我们介绍Hibernate的基本映射原理以及关联关系映射。
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