星期一, 十二月 28, 2015 23:01:37
课程内容
1.helloworld
a)xml
b)annotation
2.hibernate原理模拟
----什么是O/R mapping以及为什么要有O/R mapping
3.
client-------app server(tomcat)---------struct(分发)-----------action-------------service(业务逻辑处理)-------------DAO------------model(实体类)
原来的:
client----------1.new()------------------>Student
2.jdbc
面向对象的替代面向关系的这层的逻辑。
用hibernate编程用面向对象的方法。
hibernate:
client
1.new() Student
2. configuration
3.buildsessionFactory() SessionFactory
4.openSesiion() ----createMessage()-----session
5.save(Student s)() pesist()DB
hibernate帮我们屏蔽了关系型,直接使用面向对象的方法。
面向对象的写法---hibernate---面向关系的数据库
风格
1.先脉络,后细节
2.先操作,后原理
3.重Annotation,轻xml配置文件
JPA java持久化api
hibernate-extension
资源:
1.http:www.hibernate.org
hibernate-annotation-3.4
hibernate-distribution-3.3
slf4j-1.5.8
一、new一个java project,名为hibernate_0100_HelloWorld
2.学习建立user library -hibernate,并加入相应的jar包
2.1在windows-->preference-->java-->user library
new自己包,名称为hibernate-->add jars
2.2在该libraries中加入hibernate所需jar包
1.hibernate core
2./required
3.slf-nop.jar
3.引入mysql的jdbc驱动包
4.在mysql中建立对应的数据库以及表
1.create database hibernate
2.user hibernate
3.create table Student(id int primary key,name varchar(20),age int);
5.建立hibernate配置文件hibernate.cfg.xml
1.从参考文档中copy
2.修改赌赢的数据库连接
3.注释掉暂时用不上的内容
6.建立Student类
7.建立Student映射文件Student.hbm.xml
参考文档
8.将映射文件加入到hibernate.cfg.xml
参考文档
9.写测试类Main,在Main中对Student对象进行直接的存储测试
参考文档
二、在mysql中创建数据库和表
create database hibernate;
use hibernate;
create table student(id int primary key,name varchar(20),age int);
hibernate-annotations-3.4.0 GA
hibernate-distribution-3.3.2.GA-dist
slf4j-1.5.8
原理
object relatation的sql语句
从sql里拿出来再进行组装成object
建立java project
window-->preference-->java-->user libraries
需要jar 在distribution中的hibernate3.jar
G:\asiainfo\web_hp2\Hibernate3.3.2\jar\hibernate-distribution-3.3.2.GA\lib\required 所以的jar
G:\asiainfo\web_hp2\Hibernate3.3.2\jar\slf4j-1.5.8 slf4j-nop-1.5.8.jar
在src中新建file
hibernate.cfg.xml
数据库配置连接
com.mysql.jdbc.Driver
jdbc:mysql://localhost/hibernate
root
root
package com.zhuhw.hibernate; public class Student { private int id; 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; } private String name; private int age; }
<?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/hibernate</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.MySQLDialect</property> <!-- Enable Hibernate's automatic session context 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 stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup --> <!-- <property name="hbm2ddl.auto">update</property>--> <!-- hibernate去哪里找这个配置文件 --> <mapping resource="com/zhuhw/hibernate/Student.hbm.xml"/> </session-factory> </hibernate-configuration>
<?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <!-- 找不到entity,是因为这个类没有改包名 --> <hibernate-mapping package="com.zhuhw.hibernate"> <class name="Student" table="student" > <!-- id主键;name=id对应的是Student中的getid() --> <id name="id" ></id> <property name="name" /> <property name="age" /> <!-- hibernater知道了怎么将class与表中的字段对应到一起了 --> </class> </hibernate-mapping>
import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; import com.zhuhw.hibernate.Student; public class StudentTest { public static void main(String[] args){ Student s = new Student(); s.setId(1); s.setAge(23); s.setName("ll"); Configuration cf = new Configuration(); SessionFactory sf = cf.configure().buildSessionFactory(); Session session = sf.openSession(); //在hibernate中执行操作要在一个事务里面 session.beginTransaction(); session.save(s); session.getTransaction().commit(); session.close(); sf.close(); } }
运行结果:
Hibernate: insert into student (name, age, id) values (?, ?, ?)