修正comment，banner接口

src/main/resources/mybatis/BannersDao.xml

@@ -95,4 +95,12 @@
       createtime = #{createtime,jdbcType=TIMESTAMP}
     where id = #{id,jdbcType=INTEGER}
   </update>
+
+
+  <select id="selectByAllBanners" parameterType="java.lang.Integer" resultMap="BaseResultMap">
+    select
+      *
+    from ln_banners
+  </select>
+
 </mapper>