hibernate的简单配置和使用
Hibernate的作用:
这个是Hibernate的一个简单结构。
Hibernate是一款持久化框架(ORM)即Object Relationship Mapping,对JDBC进行了轻量级的封装,他能够自动根据我们的需求,能够将我们的实体类映射到数据库表中而进行存储。
这就是它的作用。
我们需要配置两个配置文件:
①/TestHibernate/src/hibernate.cfg.xml
②/TestHibernate/src/entity/Student.hbm.xml
这两个文件所在的位置大家也看到了,hibernate.cfg.xml在src下,Student.hbm.xml和实体类放在同一个包下。
hibernate.cfg.xml:
<?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>
<!-- 1. 数据库相关 -->
<property name="connection.username">root</property>
<property name="connection.password">123</property>
<property name="connection.url">jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 配置本地事务(No CurrentSessionContext configured!) -->
<property name="hibernate.current_session_context_class">thread</property>
<!-- 2. 调试相关 显示sql 格式化sql-->
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<!-- hibernate需要管理的数据库表对应的实体类映射文件 -->
<mapping resource="com/zking/test/entity/Student.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Student.hbm.xml:
<?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>
<!--
table:实体类所对应的表
name:实体类的全类名
-->
<class table="t_struts_student" name="com.zking.test.entity.Student" >
<!--
name:实体类的属性
type:实体类的属性类型
column:指的是数据库表的主键列
-->
<id name="sid" type="java.lang.Integer" column="sid">
</id>
<!-- id标签打头,代表配置的是数据库表与实体类的关系,其他property配置的是数据库表的普通列 -->
<property name="sname" type="java.lang.String" column="sname"></property>
<property name="spin" type="java.lang.String" column="spin"></property>
<property name="sex" type="java.lang.String" column="sex"></property>
<property name="mark" type="java.lang.String" column="mark"></property>
<property name="cid" type="java.lang.Integer" column="cid"></property>
<property name="fileFileName" type="java.lang.String" column="fileFileName"></property>
<property name="fileContentType" type="java.lang.String" column="fileContentType"></property>
</class>
</hibernate-mapping>
有两个配置文件的dtd约束在我们我Hibernate核心jar包里面有:
接下来需要我们再entity包下建立对应的实体类:
package com.zking.one.entity;
import java.io.Serializable;
public class User implements Serializable {
private static final long serialVersionUID = -3363120264501521428L;
private Integer id;
private String userName;
private String userPwd;
private String realName;
private String sex;
private java.sql.Date birthday;
private java.sql.Timestamp createDatetime;
private String remark;
public User() {
super();
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPwd() {
return userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
public String getRealName() {
return realName;
}
public void setRealName(String realName) {
this.realName = realName;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public java.sql.Date getBirthday() {
return birthday;
}
public void setBirthday(java.sql.Date birthday) {
this.birthday = birthday;
}
public java.sql.Timestamp getCreateDatetime() {
return createDatetime;
}
public void setCreateDatetime(java.sql.Timestamp createDatetime) {
this.createDatetime = createDatetime;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
@Override
public String toString() {
return "User [id=" + id + ", userName=" + userName + ", userPwd=" + userPwd + ", realName=" + realName
+ ", sex=" + sex + ", birthday=" + birthday + ", createDatetime=" + createDatetime + ", remark="
+ remark + "]";
}
}
接下来使我们的测试文件:
package com.zking.one.test;
import java.util.Map;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.zking.one.entity.User;
public class demo1 {
public static void main(String[] args) {
/**
* 1,读取hibernate.cfg.xml文件
* 2,通过xml建模得到sessionfactory工厂
* 3,获取数据库操作的当前会话
* 4,开启事务
* 5,具体的数据库操作
* 6,提交事务
* 7,将会话(session)关闭
*/
Configuration configure = new Configuration().configure("hibernate.cfg.xml");
SessionFactory SessionFactory = configure.buildSessionFactory();
Session session = SessionFactory.openSession();
Transaction transaction = session.beginTransaction();
User user = new User();
user.setUserName("祥");
user.setUserPwd("123");
user.setRemark("keng");
user.setSex("男");
user.setRemark("xxx00");
session.save(user);
transaction.commit();
session.close();
}
}