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src/main/java/com/example/practice/mapper/UserMapper.java

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+package com.example.practice.mapper;
+
+import com.example.practice.entity.User;
+
+import java.util.List;
+
+public interface UserMapper {
+
+    int insert (User user);
+
+    int delete(Long id);
+
+    int update(User user);
+
+    User selectOne(Long id);
+
+    List<User> selectList();
+
+}