mybatis 修改关联表报错

软件环境

spring springmvc mybatis

数据库：mysql

报错信息：
mybatis 修改关联表报错Parameter 'key_dm' not found. Available parameters are [0, member, param1, param2]

代码提示：

//mybatis.xml代码

<?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">
<mapper namespace="com.app.dao.mapper.MemberPermissionMapper">
    <resultMap type="MemberPermission" id="MemberPermission">
        <id column="id" property="id"/>
        <result column="member_id" property="member_id"/>
        <result column="ttys" property="ttys"/>
        <result column="key_dm" property="key_dm"/>
        <result column="lose_time" property="lose_time"/>
        <result column="note" property="note"/>
        <result column="update_time" property="update_time"/>
        <!-- 关联member表 -->
        <association property="member" javaType="com.app.bean.Member">
            <id column="member_id" property="id"/>
            <result column="phone" property="phone"/>
            <result column="name" property="name"/>
            <result column="password" property="password"/>
        </association>
    </resultMap>

    <update id="updateMemberLoginPermission" parameterType="MemberPermission">
        UPDATE dt_member_permission AS t1
        LEFT JOIN dt_member AS t2 ON t1.member_id=t2.id
        <set>
            <if test="key_dm!=null and key_dm !=''">t1.key_dm=#{_key_dm},
            </if>
        </set>
        WHERE t1.ttys=#{ttys}
        AND t2.phone=#{phone}
        AND t2.password=#{password}
    </update>

//service业务层实现类代码

   @Override
    public int updateMemberLoginPermission( @Param("ttys") String ttys, @Param("phone") String phone, @Param("newpwd") String newpwd, @Param("key_dm") String key_dm) {

       MemberPermission memberPermission= new MemberPermission();
        memberPermission.setTtys(ttys);
        memberPermission.setKey_dm(key_dm);

        Member member = new Member();
        member.setPhone(phone);
        member.setPassword(newpwd);
        return memberPermissionDao.updateMemberLoginPermission(memberPermission,member);
    }

//dao层代码

public interface MemberPermissionDao {


    public int updateMemberLoginPermission(MemberPermission memberPermission, @Param("member") Member member);//根据终端类型 用户手机号密码修改动态key 关联表
}

//mapper.java接口代码

package com.app.dao.mapper;

import com.app.bean.Member;
import com.app.bean.MemberPermission;
import org.apache.ibatis.annotations.Param;

import java.util.List;
import java.util.Map;

public interface MemberPermissionMapper {

    public int updateMemberLoginPermission(MemberPermission memberPermission, @Param("member")Member member);//根据终端类型 用户手机号密码修改动态key 关联表
}

你别用实体类传参，使用map。
Map map = new HashMap();
map.put("ttys",ttys);
map.put("phone",phone);
map.put("key_dm",key_dm);
map.put("password",password);
xml中的update语句修改成:

UPDATE dt_member_permission AS t1
LEFT JOIN dt_member AS t2 ON t1.member_id=t2.id

t1.key_dm=#{key_dm}


WHERE t1.ttys=#{ttys}
AND t2.phone=#{phone}
AND t2.password=#{password}

肯定就行了！

t1.key_dm=#{_key_dm},这里有问题吧，参数应该是key_dm啊，怎么多了一个下划线？