解决mybatis #{}无法自动添加引号的错误

Map<String, String> map = new HashMap<>(2);
map.put("userName", userName);
return userMapper.selectUserByName(map);

<select id="selectUserByName" parameterType="map" resultType="userDO">
    select
        user_id as userId,
        user_name as userName,
        user_password as userPassword,
        user_level as userLevel,
        user_gmt_create as userGmtCreate,
        user_gmt_modified as userGmtModified
    from user
    where user_name = #{userName}
</select>

-- 错误提示
select `uid`, `username`, `password`, `time`         
from blogs_user     
where username = wu;
-- 正确的sql语句
select `uid`, `username`, `password`, `time`         
from blogs_user     
where username = 'wu';

  <!--  ${user.username}  -->
  <select id="xxx" parameterType="wu.bean.User" resultMap="BaseResultMap">
    select
    <include refid="base_column_list"/>
    from blogs_user
    where username = ${user.username};
  </select>
  <!--  #{user.username} -->
  <select id="xxx" parameterType="wu.bean.User" resultMap="BaseResultMap">
    select
    <include refid="base_column_list"/>
    from blogs_user
    where username = ${user.username};
  </select>

<?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>
  <settings>
    <!--  打印查询语句    -->
    <setting name="logImpl" value="STDOUT_LOGGING"/>
	....
  </settings>
  <typeAliases>
    ....
  </typeAliases>
  
  <mappers>
  	.....
  </mappers>
</configuration>