跟我学Hibernate框架技术——在容器外实现Hibernate的包含关系及应用实例（MySQL——第1部分）

1、杨教授工作室 精心创作的优秀程序员 职业提升必读系列资料目 录1.1在容器外实现hibernate的包含关系及应用实例（mysql第1部分）21.1.1构建项目在相关的各个pojo类21.1.2映射相关的数据库表91.1.3编程项目中相关的dao类111.1 在容器外实现hibernate的包含关系及应用实例（mysql第1部分）1.1.1 构建项目在相关的各个pojo类1、了解component（组合）映射技术的基本要求在hibernate的世界中,术语fine-grained object model,大致意思就是适当的细粒度对象模型所谓的细粒度对象模型是指在业务模型的对象上加以细分,得到

2、更多的业务模型对象,说白了就是就把一个对象分成几个对象对hibernate而言,主要是针对实体类设计的对象细分,对象的细分主要出于两种目的（1）面向设计的粒度细分：通过对象的细化,实现更加清晰的系统逻辑（2）性能的粒度细分：针对业务逻辑,通过合理的细粒度对象,提高系统的能耗比(性能/资源消耗)如果包含目标类的一个对象，可以应用component（组合）映射技术。2、添加一个emailpo类（1）emailpo类、com.px1987.sshwebcrm.dao.pobjectprivate string mailname; /它代表邮件帐号 private string host; /它代表邮

3、件服务器的主机名package com.px1987.sshwebcrm.dao.pobject;public class emailpoprivate string mailname; /它代表邮件帐号 private string host; /它代表邮件服务器的主机名public string gethost() return host;public void sethost(string host) this.host = host;public string getmailname() return mailname;public void setmailname(string ma

4、ilname) this.mailname = mailname;overridepublic int hashcode() final int prime = 31;int result = 1;result = prime * result + (host = null) ? 0 : host.hashcode();result = prime * result+ (mailname = null) ? 0 : mailname.hashcode();return result;overridepublic boolean equals(object obj) if (this = obj

5、)return true;if (obj = null)return false;if (getclass() != obj.getclass()return false;final emailpo other = (emailpo) obj;if (host = null) if (other.host != null)return false; else if (!host.equals(other.host)return false;if (mailname = null) if (other.mailname != null)return false; else if (!mailna

6、me.equals(other.mailname)return false;return true;3、在项目中再添加一个userinfopo类（1）userinfomailpo类、com.px1987.sshwebcrm.dao.pobjectprivate string id; private string username; private char usersex; private int userage; private emailpo email;package com.px1987.sshwebcrm.dao.pobject;public class userinfomailpo

7、 /更好地体现 oo中封装private string id; overridepublic int hashcode() final int prime = 31;int result = 1;result = prime * result + (email = null) ? 0 : email.hashcode();result = prime * result + (id = null) ? 0 : id.hashcode();result = prime * result + userage;result = prime * result+ (username = null) ? 0

8、 : username.hashcode();result = prime * result + usersex;return result;overridepublic boolean equals(object obj) if (this = obj)return true;if (obj = null)return false;if (getclass() != obj.getclass()return false;userinfopo other = (userinfopo) obj;if (email = null) if (other.email != null)return fa

9、lse; else if (!email.equals(other.email)return false;if (id = null) if (other.id != null)return false; else if (!id.equals(other.id)return false;if (userage != other.userage)return false;if (username = null) if (other.username != null)return false; else if (!username.equals(other.username)return fal

10、se;if (usersex != other.usersex)return false;return true;public string getid() return id;public void setid(string id) this.id = id;public string getusername() return username;public void setusername(string username) this.username = username;public char getusersex() return usersex;public void setuser

11、sex(char usersex) this.usersex = usersex;public int getuserage() return userage;public void setuserage(int userage) this.userage = userage;public emailpo getemail() return email;public void setemail(emailpo email) this.email = email;private string username; private char usersex; private int userage;

12、 private emailpo email;public userinfomailpo()1.1.2 映射相关的数据库表1、设计数据库表_将紧密相关的数据放在同一个表（粗粒度的设计提高数据访问性能）userinfotable数据库表的结构如下：2、设计我们的userinfomailpo.hbm.xml映射文件 3、在hibernate.cfg.xml中增加对userinfomailpo.hbm.xml映射文件的关联1.1.3 编程项目中相关的dao类1、在项目中添加一个新的接口containhibernatedaointerface接口，包名称为com.px1987.sshwebcrm.da

13、erpackage er;import org.hibernate.hibernateexception;public interface containhibernatedaointerface public boolean doinsertuserinfodatatodb()throws hibernateexception,java.io.unsupportedencodingexception; public boolean doselectuserinfodatafromdb(string selecthql) thr

14、ows hibernateexception;2、添加containhibernatedaointerface接口的实现类containhibernatedaoimple、包名称为com.px1987.sshwebcrm.dao.imple编程该实现类package com.px1987.sshwebcrm.dao.imple;import java.util.list;import java.util.listiterator;import mons.logging.log;import mons.logging.logfactory;

15、import org.hibernate.hibernateexception;import org.hibernate.session;import org.hibernate.transaction;import er.containhibernatedaointerface;import com.px1987.sshwebcrm.dao.pobject.emailpo;import com.px1987.sshwebcrm.dao.pobject.userinfopo;import com.px1987.sshwebcrm.dao.

16、util.hibernateutil;public class containhibernatedaoimple implements containhibernatedaointerface private static log log = logfactory.getlog(hibernatedaobean.class);public containhibernatedaoimple() public boolean doinsertuserinfodatatodb() throws hibernateexception,java.io.unsupportedencodingexcepti

17、onsession session=null;transaction tx=null;trysession = hibernateutil.currentsession();tx= session.begintransaction();userinfomailpo oneuser = new userinfomailpo ();/*对某些数据库系统如mssqlserver2000必须进行字符的编码转换，否则会出现中文乱码oneuser.setusername(new string(张三.getbytes(gb2312),iso8859-1); */oneuser.setusername(张三)

18、; oneuser.setusersex(m); oneuser.setuserage(30);emailpo oneemail = new emailpo(); oneemail.sethost();oneemail.setmailname(trainict);oneuser.setemail(oneemail); /通过它来体现组合关系session.save(oneuser); /保存该实体mit();catch(hibernateexception he)if ( tx!=null )tx.rollback();log.error(在doinsertuser

19、infodatatodb方法中出现了hibernateexception错误, he); throw he;/* catch(java.io.unsupportedencodingexception ex) log.error(在doinsertuserinfodatatodb方法中出现了unsupportedencodingexception错误, ex); throw ex; */finallyhibernateutil.closesession();return true; /下面的代码片段則说明如何查询数据。public boolean doselectuserinfodatafromdb(string selecthql) throws hibernateexceptionsession session=null;transaction tx=null;trysession = hibernateutil.currentsessi