mybatis parameter transfer problem

1. Multiple parameters of the same type can be brought into the Map, such as:

service:

HashMap< String, String> map=new HashMap<String, String>();
    map.put("id", user.getId());
    map.put("pwd", newpwd);
    int a=dao.upPwd(map);

dao:

int upPwd(HashMap<String, String> map);

<!--Change password-->
	<update id="upPwd" parameterType="Map">update user set pwd=#{pwd} where id=#{id}</update>

2. Different types of parameters can be annotated with @Param, such as:

dao:

int updateUserRoles(@Param("uid")String uid, @Param("rlist")List<String> ridList);

<!--Batch insert user permissions-->
	<insert id="updateUserRoles" >
		insert into userrole (rid,uid)
		values
		<foreach collection="rlist" item="item" index="index" separator=",">(#{item},#{uid})</foreach>
	</insert>

3. Single parameter: add an underscore before this parameter in xml, such as:

dao:

String getRidByName(String name);

<!--Query rid by name-->
	<select id="getRidByName" resultType="String">select rid from role where name=#{_name}</select>