MyBatis联合查询和修改例子

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copy http://blog.csdn.net/caodegao/article/details/6735049
 

企业级项目实战(带源码)地址：http://zz563143188.iteye.com/blog/1825168

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演示项目源码 请下载codeFactory20130321,lib20130321文件,

MyBatis现在还挺少人用的,刚玩的时候在网站查资料都没有很多贴研究它.走了很多弯路;

在此做了一个小例子,跟大家分享一下;

如果能对一些刚玩MyBatis的朋友一些帮助就再好不过了.

首先给大家配置MyBatis的前奏,毕竟什么框架都是配置出来的,大家得下载MyBatis的文档,上面有很详细的配置前奏.

我就不给大家贴出来了.我是用Spring和Struts2集成的.别怪我太自私啊!下次慢慢在贴出集成的例子,

 

先给大家sql的配置吧

我有一个总文件mybatis-config.xml,在总文件加载子文件,这样至少分工还算明细些.

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重点在这个weibo-mapper.xml里面,这个也一样自己写他的sql映射account-mapper.xml

由于就演示一个表weibo关联表account,关联都在weibo-mapper.xml里面写.account-mapper.xml就不给大家了,没什么大碍的.

配置文件的详细我都写了,大家靠自己的悟性吧.

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                    javaType="Account" resultMap="joinAccountResult" /> 
     
     
     
     
         
         
         
     
     
     
     
         
         
         
         
                    javaType="Account" resultMap="joinAccountResult" /> 
     
     
     
            resultMap="weiboJoinAccountResultMap" parameterType="Weibo"> 
        select w.w_id,w.w_context,w.w_create_time, a.a_id as 
        w_acc_id,a.a_username,a.a_head_image from weibo w left outer 
        join account a on w.w_acc_id = a.a_id where w.w_create_time > 
        #{wCreateTime} order by w.w_create_time desc 
     
     
     
     
        select w.w_id,w.w_context,w.w_create_time, a.a_id 
        from weibo w left join account a on w.w_acc_id = a.a_id 
     
 
     
     
             resultMap="weiboResultMap"> 
        select w.w_id,w.w_context,w.w_create_time, w.w_acc_id  
        from weibo w 
        where w.w_id = #{wId} 
     
     
     
            keyProperty="wId"> 
        insert into weibo(w_acc_id,w_context,w_create_time) 
        values(#{account.aId},#{wContext},#{wCreateTime}) 
     
     
     
     
        update weibo set w_acc_id = #{account.aId},w_context = #{wContext},w_create_time = #{wCreateTime} 
        where w_id = #{wId} 
     
     
     
     
        delete from weibo where w_id = #{wId} 
     
 
 

pojo类:这里你要注意了, 怎么给数据做搜集,

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package com.cookiejoo.beans; 
 
import java.util.Date; 
 
public class Weibo { 
    private Integer wId; 
    private Account account; 
    private String wContext; 
    private Date wCreateTime; 
 
    public Weibo() { 
    } 
 
    public Integer getWId() { 
        return wId; 
    } 
 
    public void setWId(Integer wId) { 
        this.wId = wId; 
    } 
 
    public Account getAccount() { 
        return account; 
    } 
 
    public void setAccount(Account account) { 
        this.account = account; 
    } 
 
    public String getWContext() { 
        return wContext; 
    } 
 
    public void setWContext(String context) { 
        wContext = context; 
    } 
 
    public Date getWCreateTime() { 
        return wCreateTime; 
    } 
 
    public void setWCreateTime(Date createTime) { 
        wCreateTime = createTime; 
    } 
 
} 

 

两张表结构很简单

id都是自动增长的;

Table weibo

===========

w_id, w_acc_id, w_context, w_create_time

-----------

w_id             int(11) PK

w_acc_id         int(11)

w_context        varchar(2000)

w_create_time    datetime

 

Table account

=============

a_id, a_username, a_password, a_sex, a_phone, a_brithday, a_create_time, a_head_image

-------------

a_id             int(11) PK

a_username       varchar(45)

a_password       varchar(45)

a_sex            int(2)

a_phone          varchar(15)

a_brithday       datetime

a_create_time    datetime

a_head_image     varchar(45)

这个是java调用的例子,一个接口一个实现类,我用了Spring集成了,所以和单独的MyBatis例子有点出入,大家对着MyBatis文档做时就是获取getSqlSession这个不一样而已.

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package com.cookiejoo.iservice.impl; 
 
import java.util.Date; 
import java.util.List; 
 
import org.mybatis.spring.support.SqlSessionDaoSupport; 
import com.cookiejoo.beans.Weibo; 
import com.cookiejoo.iservice.IWeiboService; 
 
public class WeiboServiceImpl extends SqlSessionDaoSupport implements 
        IWeiboService { 
 
    @SuppressWarnings("unchecked") 
    public List findWeiboJoinAccount(Weibo w) { 
        return getSqlSession().selectList( 
                "com.cookiejoo.beans.Weibo.findWeiboJoinAccount", w); 
    } 
 
    @SuppressWarnings("unchecked") 
    public List findAllWeibo() { 
        return getSqlSession().selectList( 
                "com.cookiejoo.beans.Weibo.findAllWeibo"); 
    } 
 
    public void addWeibo(Weibo w) { 
        w.setWCreateTime(new Date()); 
        getSqlSession().insert("com.cookiejoo.beans.Weibo.addWeibo", w); 
    } 
 
    public void updateWeibo(Weibo w) { 
        getSqlSession().update("com.cookiejoo.beans.Weibo.updateWeibo", w); 
    } 
 
    public void deleteWeibo(Weibo w) { 
        getSqlSession().delete("com.cookiejoo.beans.Weibo.deleteWeibo", w); 
    } 
 
    public Weibo findAllWeiboById(Integer wId) { 
        return (Weibo) getSqlSession().selectOne( 
                "com.cookiejoo.beans.Weibo.findAllWeiboById", wId); 
    } 
 
} 

 

接着页面展示,我用jsp写的,用struts2做跳转...     myJsp.jsp

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<%@ page language="java" pageEncoding="UTF-8"%> 
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> 
<%@ taglib prefix="s" uri="/struts-tags"%> 
 
 
 
     
         
         
         
         
         
     
 
     
    ------------------------------------------------------------------------------------------- 
   

 
     
   

 
    ------------------------------------------------------------------------------------------- 
   

 
   
 
   
 
     
     
   

 
    ------------------------------------------------------------------------------------------- 
   

 
   
 
   
 
     
     
     
   

 
     
    findWeiboByBean 
       

 
       
 
         
             
             
             
                 
             
       

id	context	createTime	aid	operator
${weibo.WId }	${weibo.WContext }	${weibo.WCreateTime }	${weibo.account.AId }	delete