mybatis多表关联查询获取list结果集

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1. <mapper namespace="com.wztx.java">  
2.     <resultMap id="resultMap" type="java.util.HashMap">  
3.         <result property="customer_id" column="customer_id"/>  
4.         <result property="customer_name" column="customer_name"/>  
5.         <result property="address" column="address"/>  
6.         <result property="cs_tele" column="cs_tele"/>  
7.         <result property="username" column="username"/>  
8.         <result property="codeitem_name" column="codeitem_name"/>  
9.         <result property="createTime" column="createTime"/>  
10.     </resultMap>  
11. <select id="selectlimit" resultMap="resultMap">  
12.         select   
13.             a.customer_id,  
14.             a.customer_name,  
15.             a.address,  
16.             a.cs_tele,  
17.             b.username,  
18.             c.codeitem_name,  
19.             a.createTime  
20.         from   
21.             tbl_crm_customer a  
22.         LEFT JOIN   
23.             tbl_comp_user b on a.forUser=b.user_id  
24.         LEFT JOIN   
25.             tbl_crm_codeItem c on a.customer_status=c.code_item_id  
26.         order by   
27.             a.createTime DESC  
28.         limit  
29.             #{begin},#{sum};  
30.   
31.     </select>  
32. </mapper>  

config:

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1. <?xml version="1.0" encoding="gbk"?>  
2. <!DOCTYPE configuration   
3. PUBLIC "-//mybatis.org//DTD Config 3.0//EN"   
4. "http://mybatis.org/dtd/mybatis-3-config.dtd">   
5. <configuration>   
6.      <environments default="development">   
7.         <environment id="development">   
8.          <transactionManager type="JDBC"/>   
9.          <dataSource type="POOLED">   
10.               <property name="driver" value="com.mysql.jdbc.Driver"/>   
11.               <property name="url" value="jdbc:mysql://139.210.36.220:3306/crm"/>  
12.               <property name="username" value="root"/>   
13.               <property name="password" value="smartlbs2012DB"/>   
14.           </dataSource>   
15.       </environment>   
16.     </environments>  
17. <mappers>   
18. <mapper resource="com/wztx/java/customer.xml"/>  
19. </mappers>  
20. </configuration>  

java dao

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1. /** 
2.      * 查询所有的信息 
3.      * @param nowpage 
4.      * @param sum 
5.      * @param c_name 
6.      * @return 
7.      */  
8.     public List selectAllCustomer(int nowpage,int sum){  
9.         SqlSession session = null;  
10.         List list=null;  
11.         try {  
12.         session = DbSessionFactory.getSqlSessionFactory().openSession();  
13.          Map<String,Object> map=new HashMap<String,Object>();     
14.          map.put("begin",nowpage);  
15.          map.put("sum", sum);  
16.          
17.         list = (List)session.selectList("com.wztx.java.selectlimit",map);  
18.             session.commit();  
19.         } catch (Exception e) {  
20.             e.printStackTrace();  
21.         }finally {  
22.             session.close();  
23.         }  
24.         return list;  
25.     }  

servlet :

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1. response.setContentType("text/html;charset=GBK");  
2.         response.setContentType("text/json;charset=GBK");  
3.         request.setCharacterEncoding("GBK");  
4.         PrintWriter out = response.getWriter();  
5.           
6.         String page =request.getParameter("nowPage");  
7.         String sum = request.getParameter("rows");  
8.         int nowPage = Integer.parseInt(page);  
9.         int rows = Integer.parseInt(sum);  
10.         QueryDao querydao = new QueryDao();  
11.         ArrayList<Map> al =(ArrayList<Map>) querydao.QueryAllCustomer(nowPage,rows);  
12.           

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1.                for(int i =0;i<al .size();i++){  
2. Map m = (Map)al.get(i);  
3. System.out.println(m.get("customer_name"));  
4. }  

取出所有的结果集。可以继续扩展分页功能。