second

src/main/resources/mapper/UserMapper.xml

@@ -2,8 +2,8 @@
 <!DOCTYPE mapper
         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
-<mapper namespace="fdsgfgd">
-    <select id="selectList" resultType="com.example.practice.entity.User">
+<mapper namespace="com.example.practice.mapper.UserMapper">
+    <select id="selectAll" resultType="com.example.practice.entity.User">
         select * from user
     </select>