mybatis-plus中可以使用<include>标签嘛

是的，Mybatis-Plus中可以使用`<include>`标签，它可以将SQL语句中的重复部分提取出来，减少代码重复，提高可维护性。使用`<include>`标签的语法格式如下：

<select id="selectUsers" resultMap="userResult">
  SELECT
    id, username, password, email, nickname, reg_time
  FROM
    user
  <where>
    <if test="username != null and username != ''">
      and username like concat('%', #{username}, '%')
    </if>
    <if test="email != null and email != ''">
      and email like concat('%', #{email}, '%')
    </if>
  </where>
  <include refid="orderByClause"/>
  LIMIT #{offset}, #{limit}
</select>

<sql id="orderByClause">
  <if test="orderBy != null and orderBy != ''">
    ORDER BY ${orderBy}
  </if>
  <if test="orderBy == null or orderBy == ''">
    ORDER BY reg_time DESC
  </if>
</sql>

在上面的例子中，`<include>`标签引用了`<sql>`标签中的`orderByClause`，简化了SQL语句的编写。