mybatis使用map做入参

Posted 2020-11-21 清风拂来

测试例子：

controlelr层

 1 package org.slsale.test;
 2 
 3 import java.util.HashMap;
 4 import java.util.List;
 5 import java.util.Map;
 6 
 7 import net.sf.json.JSONArray;
 8 
 9 import org.slsale.pojo.User;
10 import org.springframework.beans.factory.annotation.Autowired;
11 import org.springframework.stereotype.Controller;
12 import org.springframework.web.bind.annotation.RequestMapping;
13 import org.springframework.web.bind.annotation.ResponseBody;
14 
15 @Controller
16 @RequestMapping("/test")
17 public class TestController {
18     
19     @Autowired
20     private TestService service;
21     
22     @RequestMapping(value="/getUsers",produces = { "text/html;charset=UTF-8" }) //返回页面的数据中有中文，用produces 处理乱码
23     @ResponseBody
24     public String getUsers(){
25         Map<String, Object> params = new HashMap<String, Object>();
26         params.put("isStart", 1);
27         params.put("userType", "1");
28         params.put("startNum", 0);
29         params.put("pageSize", 5);
30         List<User> users = service.getUsers(params);
31         JSONArray jsonArray = JSONArray.fromObject(users);
32         return jsonArray.toString();
33     }
34 
35 }

2.service层

 1 package org.slsale.test;
 2 
 3 import java.util.List;
 4 import java.util.Map;
 5 
 6 import org.slsale.dao.testmapper.TestUserMapper;
 7 import org.slsale.pojo.User;
 8 import org.springframework.beans.factory.annotation.Autowired;
 9 import org.springframework.stereotype.Service;
10 
11 @Service
12 public class TestService {
13     
14     @Autowired
15     private TestUserMapper mapper ;
16     
17     public List<User> getUsers(Map<String, Object> params){
18         return mapper.getUserList1(params);
19     }
20 
21 }

3.dao层，返回list

 1 package org.slsale.dao.testmapper;
 2 
 3 import java.util.List;
 4 import java.util.Map;
 5 
 6 import org.slsale.pojo.User;
 7 
 8 public interface TestUserMapper {
 9     
10     public List<User> getUserList1(Map<String, Object> map);
11 
12 }

sql映射mapper xml：

 1 <?xml version="1.0" encoding="UTF-8"?>  
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"    
 3 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 4 
 5 <mapper namespace="org.slsale.dao.testmapper.TestUserMapper">
 6 
 7     <!-- getUserList1 根据条件查询分页用户列表,联表查询，表名使用了别名，需要使用ResultMap进行字段映射而不再是 resultType="user"-->
 8     <select id="getUserList1" resultMap="userResultMap" parameterType="Map">
 9         select u.userName ,u.loginCode ,r.roleName 
10         from au_user u
11         left join au_role r on r.id=u.roleId 
12         <where>
13             <if test="userName!=null"> and u.userName like  CONCAT(‘%‘, #{userName},‘%‘)</if>   <!-- -->
14             <if test="isStart!=null">and u.isStart=#{isStart}</if>
15             <if test="userType!=null">and u.userType=#{userType}</if>
16         </where>
17         order by createTime desc limit #{startNum},#{pageSize}
18     </select>
19 
20     <resultMap id="userResultMap" type="user">
21         <id property="id" column="u.id" />
22         <result property="userName" column="u.userName" />
23         <result property="loginCode" column="u.loginCode" />
24         <result property="roleName" column="r.roleName" />
25     </resultMap>
26 
27 </mapper>

联表查询，如果表名使用了别名，接收结果集必须 使用resultmap，resultmap中的column 是sql语句中的查询字段。sql中的参数就是controller中定义的key