MyBatis 学习

MyBatis 3.1.1 API 

在线地址:http://tool.oschina.net/apidocs/apidoc?api=mybatis-3.1.1

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

 MyBatis联合查询和修改例子

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.

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <typeAlias alias="Account" type="com.cookiejoo.beans.Account" />
        <typeAlias alias="Weibo" type="com.cookiejoo.beans.Weibo" />
    </typeAliases>
    <mappers>
        <mapper resource="mybatisConfig/account-mapper.xml" />
        <mapper resource="mybatisConfig/weibo-mapper.xml" />
    </mappers>
</configuration>

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

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- 命名空间都以pojo类的包命名,很长,但是也好区分,文档上说这是MyBatis现在的规定了 -->
<mapper namespace="com.cookiejoo.beans.Weibo">
    <!-- 定义一张表,并且来个关联表 -->
    <resultMap type="Weibo" id="weiboJoinAccountResultMap">
        <id property="wId" column="w_id" />
        <result property="wContext" column="w_context" />
        <result property="wCreateTime" column="w_create_time" />
        <!-- 关联account表 -->
        <association property="account" column="w_acc_id"
            javaType="Account" resultMap="joinAccountResult" />
    </resultMap>
    
    <!-- 关联表需要的列 -->
    <resultMap type="Account" id="joinAccountResult">
        <id property="aId" column="a_id" />
        <result property="aUsername" column="a_username" />
        <result property="aHeadImage" column="a_head_image" />
    </resultMap>
    
    <!-- 定义没有关联的单表查询返回结果 -->
    <resultMap type="Weibo" id="weiboResultMap">
        <id property="wId" column="w_id" />
        <result property="wContext" column="w_context" />
        <result property="wCreateTime" column="w_create_time" />
        <!-- 关联account表 -->
        <association property="account" column="w_acc_id"
            javaType="Account" resultMap="joinAccountResult" />
    </resultMap>
    
    <!-- 根据创建时间查询 -->
    <select id="findWeiboJoinAccount"
        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>
    
    <!-- resultMap 返回 上面的结果 -->
    <select id="findAllWeibo" resultMap="weiboResultMap">
        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
    </select>

    <!-- 查询一条记录 -->
    <!-- 注意:此处的关联,看pojo类是怎么写的,如果查询出现什么错误,得看这里了 -->
    <select id="findAllWeiboById" parameterType="int"
         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}
    </select>
    
    <!--  
    首先,如果你的数据库支持自动生成主键的字段(比如MySQL和SQL Server),
    那么你可以设置useGeneratedKeys=”true”,
    而且设置keyProperty到你已经做好的目标属性上。
    例如,如果上面的Author表已经对id使用了自动生成的列类型,那么语句可以修改为
    -->
    <insert id="addWeibo" parameterType="Weibo" useGeneratedKeys="true"
        keyProperty="wId">
        insert into weibo(w_acc_id,w_context,w_create_time)
        values(#{account.aId},#{wContext},#{wCreateTime})
    </insert>
    
    <!-- 修改 -->
    <update id="updateWeibo" parameterType="Weibo">
        update weibo set w_acc_id = #{account.aId},w_context = #{wContext},w_create_time = #{wCreateTime}
        where w_id = #{wId}
    </update>
    
    <!-- 删除 -->
    <delete id="deleteWeibo" parameterType="int">
        delete from weibo where w_id = #{wId}
    </delete>

</mapper>

pojo类:这里你要注意了, 怎么给数据做搜集,

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.

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<Weibo> findWeiboJoinAccount(Weibo w) {
        return getSqlSession().selectList(
                "com.cookiejoo.beans.Weibo.findWeiboJoinAccount", w);
    }

    @SuppressWarnings("unchecked")
    public List<Weibo> 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

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="content-type" content="text/html; charset=utf-8" />
        <title>Condition  by Free CSS Templates</title>
        <meta name="keywords" content="" />
        <meta name="description" content="" />
        <style type='text/css'>
        #mytable {
            padding: 0;
            margin: 0;
        }
        
        th {
            color: #4f6b72;
            border-left: 1px solid #C1DAD7;
            border-right: 1px solid #C1DAD7;
            border-bottom: 1px solid #C1DAD7;
            border-top: 1px solid #C1DAD7;
            letter-spacing: 2px;
            text-transform: uppercase;
            text-align: left;
            padding: 6px 6px 6px 12px;
            background: #CAE8EA no-repeat;
        }
        
        td {
            border-left: 1px solid #C1DAD7;
            border-right: 1px solid #C1DAD7;
            border-bottom: 1px solid #C1DAD7;
            background: #fff;
            padding: 6px 6px 6px 12px;
            color: #4f6b72;
        }
        </style>
    </head>

    <body>
    -------------------------------------------------------------------------------------------
    <form action="findAllWeibo.action"><input value="findAllWeibo" type="submit"/>
    <input name="weibo.wCreateTime" type="text" value="2011-01-01"/>
    </form>
    -------------------------------------------------------------------------------------------
    <form action="addWeibo.action">
    <input name="weibo.wContext" type="text" value="2011-01-01"/><br>
    <input name="weibo.account.aId" type="text" value="1"/><br>
    <input name="weibo.wCreateTime" type="text" value="2011-01-01"/>
    <input value="addWeibo" type="submit"/>
    </form>
    -------------------------------------------------------------------------------------------
    <form action="updateWeibo.action">
    <input name="weibo.wContext" type="text" value="2011-02-01"/><br>
    <input name="weibo.account.aId" type="text" value="2"/><br>
    <input name="weibo.wCreateTime" type="text" value="2011-02-01"/>
    <input name="weibo.wId" type="text" value="54"/>
    <input value="updateWeibo" type="submit"/>
    </form>
    
    <a href="findWeiboByBean.action">findWeiboByBean</a>
        <h3></h3>
        <br>
        <table id='mytable' cellspacing='0'  width='100%'>
            <tr>
            <th>id</th><th>context</th><th>createTime</th><th>aid</th><th>operator</th></tr>
            <c:forEach items="${weibos}" var="weibo">
                <tr><td>${weibo.WId }</td><td>${weibo.WContext }</td><td>${weibo.WCreateTime }</td><td>${weibo.account.AId }</td><td><a href="deleteWeibo.action?weibo.wId=${weibo.WId }">delete</a></td></tr>
            </c:forEach>
        </table>
    </body>
    
    
</html>

原文:http://blog.csdn.net/bluesky5219/article/details/7066174

spring与mybatis三种整合方法

本文主要介绍Spring与Mybatis三种常用整合方法,需要的整合架包是mybatis-spring.jar,可通过链接
http://code.google.com/p/mybatis/下载到。

  1、采用数据映射器(MapperFactoryBean)的方式,不用写mybatis映射文件,采用注解方式提供相应的sql语句和输入参数。
  (1)Spring配置文件:

     <!-- 引入jdbc配置文件 -->
     <context:property-placeholder location="jdbc.properties"/>

      <!--创建jdbc数据源 -->
      <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${driver}"/>
        <property name="url" value="${url}"/>
        <property name="username" value="${username}"/>
        <property name="password" value="${password}"/>
        <property name="initialSize" value="${initialSize}"/>
        <property name="maxActive" value="${maxActive}"/>
        <property name="maxIdle" value="${maxIdle}"/>
        <property name="minIdle" value="${minIdle}"/>
      </bean>

      <!-- 创建SqlSessionFactory,同时指定数据源-->
      <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
      <property name="dataSource" ref="dataSource" /> 
      </bean>

      <!--创建数据映射器,数据映射器必须为接口-->
      <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"> 
      <property name="mapperInterface" value="com.xxt.ibatis.dbcp.dao.UserMapper" />
      <property name="sqlSessionFactory" ref="sqlSessionFactory" /> 
      </bean>

      <bean id="userDaoImpl2" class="com.xxt.ibatis.dbcp.dao.impl.UserDaoImpl2">
      <property name="userMapper" ref="userMapper"/>
 </bean>

 
(2)数据映射器UserMapper,代码如下:
  public interface UserMapper {
        @Select("SELECT * FROM user WHERE id = #{userId}") 
        User getUser(@Param("userId") long id); 
  }
 (3) dao接口类UserDao,代码如下:
   public interface UserDao {
       public User getUserById(User user);
   }
(4)dao实现类UserDaoImpl2,,代码如下:

  public class UserDaoImpl2 implements UserDao {
       private UserMapper userMapper;

       public void setUserMapper(UserMapper userMapper) { 
           this.userMapper = userMapper; 
       } 

       public User getUserById(User user) {
          return userMapper.getUser(user.getId()); 
       }
   }

 2、采用接口org.apache.ibatis.session.SqlSession的实现类org.mybatis.spring.SqlSessionTemplate。
    mybatis中, sessionFactory可由SqlSessionFactoryBuilder.来创建。MyBatis-Spring 中,使用了SqlSessionFactoryBean来替代。SqlSessionFactoryBean有一个必须属性dataSource,另外其还有一个通用属性configLocation(用来指定mybatis的xml配置文件路径)。
   (1)Spring配置文件:
    <!-- 创建SqlSessionFactory,同时指定数据源-->
   <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
      <property name="dataSource" ref="dataSource" /> 
      <!-- 指定sqlMapConfig总配置文件,订制的environment在spring容器中不在生效-->
      <property  name="configLocation"  value="classpath:sqlMapConfig.xml"/>
      <!--指定实体类映射文件,可以指定同时指定某一包以及子包下面的所有配置文件,mapperLocations和configLocation有一个即可,当需要为实体类指定别名时,可指定configLocation属性,再在mybatis总配置文件中采用mapper引入实体类映射文件 -->
      <!- - <property  name="mapperLocations"  value="classpath*:com/xxt/ibatis/dbcp/**/*.xml"/>  -->
   </bean>
    (2)mybatis总配置文件sqlMapConfig.xml:
  <configuration>
   <typeAliases>
     <typeAlias type="com.xxt.ibatis.dbcp.domain.User" alias="User" />
  </typeAliases>
   <mappers>
      <mapper resource="com/xxt/ibatis/dbcp/domain/user.map.xml" />
     </mappers>
 </configuration>
(3)实体类映射文件user.map.xml:
<mapper namespace="com.xxt.ibatis.dbcp.domain.User">
     <resultMap type="User" id="userMap">
        <id property="id" column="id" />
        <result property="name" column="name" />
        <result property="password" column="password" />
        <result property="createTime" column="createtime" />
     </resultMap>
     <select id="getUser" parameterType="User" resultMap="userMap">
       select * from user where id = #{id}
     </select>
<mapper/>
(4)dao层接口实现类UserDaoImpl:
  public class UserDaoImpl implements  UserDao  {
     public SqlSessionTemplate sqlSession;
     public User getUserById(User user) {
         return (User)sqlSession.selectOne("com.xxt.ibatis.dbcp.domain.User.getUser", user);
     }
     public void setSqlSession(SqlSessionTemplate sqlSession) {
          this.sqlSession = sqlSession;
     }
   }
 3、采用抽象类org.mybatis.spring.support.SqlSessionDaoSupport提供SqlSession。
   (1)spring配置文件:

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
   <property name="dataSource" ref="dataSource" />
   <property  name="configLocation"  value="classpath:sqlMapConfig.xml"/>
   <!-- <property  name="mapperLocations"  value="classpath*:com/xxt/ibatis/dbcp/domain/user.map.xml"/   >  -->
</bean>

 <bean id="sqlSession"     class="org.mybatis.spring.SqlSessionTemplate"> 
      <constructor-arg index="0" ref="sqlSessionFactory" /> 
</bean>

<bean id="userDaoImpl3" class="com.xxt.ibatis.dbcp.dao.impl.UserDaoImpl3">
   <!--注入SqlSessionTemplate实例 -->
   <property name="sqlSessionTemplate" ref="sqlSession" /> 
   <!--也可直接注入SqlSessionFactory实例,二者都指定时,SqlSessionFactory失效 -->
   <!-- <property name="sqlSessionFactory" ref="sqlSessionFactory" /> 
-->
</bean>

 (2) dao层接口实现类UserDaoImpl3:
public class UserDaoImpl3 extends SqlSessionDaoSupport implements UserDao {   
  public User getUserById(User user) {   
     return (User) getSqlSession().selectOne("com.xxt.ibatis.dbcp.domain.User.getUser", user);  
  }   
}

原文:http://www.oschina.net/p/mybatis

MyBatis logo

Java数据持久层框架 MyBatis

5月23日 西安 OSC 源创会开始报名啦,存储、虚拟机、Docker 等干货分享

MyBatis 的前身就是 iBatis 。是一个数据持久层(ORM)框架。

iBATIS一词来源于“internet”和“abatis”的组合,是一个基于Java的持久层框架。iBATIS提供的持久层框架包括SQL Maps和Data Access Objects(DAO),同时还提供一个利用这个框架开发的 JPetStore实例。

在线Javadoc:http://tool.oschina.net/apidocs/apidoc?api=mybatis-3.1.1

原文地址:https://www.cnblogs.com/jexwn/p/4485277.html