diff --git a/project/src/main/java/cyou/chenx221/dao/AdminDao.java b/project/src/main/java/cyou/chenx221/dao/AdminDao.java
index cda2007..fddd440 100644
--- a/project/src/main/java/cyou/chenx221/dao/AdminDao.java
+++ b/project/src/main/java/cyou/chenx221/dao/AdminDao.java
@@ -1,4 +1,26 @@
 package cyou.chenx221.dao;
 
+import cyou.chenx221.modal.Admin;
+
+import java.util.List;
+
 public interface AdminDao {
+
+    //将给定的管理员对象添加到数据库中
+    void addAdmin(Admin admin);
+
+    //更新数据库中与给定管理员对象对应的记录
+    void updateAdmin(Admin admin);
+
+    //根据管理员ID从数据库中删除对应的记录
+    void deleteAdmin(int adminId);
+
+    //根据管理员ID从数据库中获取对应的管理员对象
+    Admin getAdminById(int adminId);
+
+    //根据管理员用户名从数据库中获取对应的管理员对象
+    Admin getAdminByUsername(String username);
+
+    //获取数据库中所有的管理员对象，并以列表形式返回
+    List<Admin> getAllAdmins();
 }
diff --git a/project/src/main/java/cyou/chenx221/dao/ScoreDao.java b/project/src/main/java/cyou/chenx221/dao/ScoreDao.java
index 003bbaa..1bfa98e 100644
--- a/project/src/main/java/cyou/chenx221/dao/ScoreDao.java
+++ b/project/src/main/java/cyou/chenx221/dao/ScoreDao.java
@@ -5,17 +5,24 @@ import cyou.chenx221.modal.Score;
 import java.util.List;
 
 public interface ScoreDao {
+    //将给定的成绩对象添加到数据库中
     void addScore(Score score);
 
+    //更新数据库中与给定成绩对象对应的记录
     void updateScore(Score score);
 
+    //根据成绩ID从数据库中删除对应的记录
     void deleteScore(int scoreId);
 
+    //根据成绩ID从数据库中获取对应的成绩对象
     Score getScoreById(int scoreId);
 
+    //根据学生ID从数据库中获取该学生的所有成绩列表
     List<Score> getScoresByStudentId(int studentId);
 
+    //根据课程名称从数据库中获取该课程的所有成绩列表
     List<Score> getScoresByCourse(String course);
 
+    //获取数据库中所有的成绩对象，并以列表形式返回
     List<Score> getAllScores();
 }
diff --git a/project/src/main/java/cyou/chenx221/dao/StudentDao.java b/project/src/main/java/cyou/chenx221/dao/StudentDao.java
index 0de50e0..15014cd 100644
--- a/project/src/main/java/cyou/chenx221/dao/StudentDao.java
+++ b/project/src/main/java/cyou/chenx221/dao/StudentDao.java
@@ -5,13 +5,18 @@ import cyou.chenx221.modal.Student;
 import java.util.List;
 
 public interface StudentDao {
+    //将给定的学生对象添加到数据库中
     void addStudent(Student student);
 
+    //更新数据库中与给定学生对象对应的记录
     void updateStudent(Student student);
 
+    //根据学生ID从数据库中删除对应的记录
     void deleteStudent(int studentId);
 
+    //根据学生ID从数据库中获取对应的学生对象
     Student getStudentById(int studentId);
 
+    //获取数据库中所有的学生对象，并以列表形式返回
     List<Student> getAllStudents();
 }
diff --git a/project/src/main/java/cyou/chenx221/dao/impl/AdminDaoImpl.java b/project/src/main/java/cyou/chenx221/dao/impl/AdminDaoImpl.java
index 96d2857..8c3baca 100644
--- a/project/src/main/java/cyou/chenx221/dao/impl/AdminDaoImpl.java
+++ b/project/src/main/java/cyou/chenx221/dao/impl/AdminDaoImpl.java
@@ -1,6 +1,38 @@
 package cyou.chenx221.dao.impl;
 
 import cyou.chenx221.dao.AdminDao;
+import cyou.chenx221.modal.Admin;
+
+import java.util.List;
 
 public class AdminDaoImpl implements AdminDao {
+    @Override
+    public void addAdmin(Admin admin) {
+
+    }
+
+    @Override
+    public void updateAdmin(Admin admin) {
+
+    }
+
+    @Override
+    public void deleteAdmin(int adminId) {
+
+    }
+
+    @Override
+    public Admin getAdminById(int adminId) {
+        return null;
+    }
+
+    @Override
+    public Admin getAdminByUsername(String username) {
+        return null;
+    }
+
+    @Override
+    public List<Admin> getAllAdmins() {
+        return null;
+    }
 }
diff --git a/project/src/main/java/cyou/chenx221/dao/impl/ScoreDaoImpl.java b/project/src/main/java/cyou/chenx221/dao/impl/ScoreDaoImpl.java
index da4cefb..ff52e1b 100644
--- a/project/src/main/java/cyou/chenx221/dao/impl/ScoreDaoImpl.java
+++ b/project/src/main/java/cyou/chenx221/dao/impl/ScoreDaoImpl.java
@@ -1,6 +1,43 @@
 package cyou.chenx221.dao.impl;
 
 import cyou.chenx221.dao.ScoreDao;
+import cyou.chenx221.modal.Score;
+
+import java.util.List;
 
 public class ScoreDaoImpl implements ScoreDao {
+    @Override
+    public void addScore(Score score) {
+
+    }
+
+    @Override
+    public void updateScore(Score score) {
+
+    }
+
+    @Override
+    public void deleteScore(int scoreId) {
+
+    }
+
+    @Override
+    public Score getScoreById(int scoreId) {
+        return null;
+    }
+
+    @Override
+    public List<Score> getScoresByStudentId(int studentId) {
+        return null;
+    }
+
+    @Override
+    public List<Score> getScoresByCourse(String course) {
+        return null;
+    }
+
+    @Override
+    public List<Score> getAllScores() {
+        return null;
+    }
 }
diff --git a/project/src/main/java/cyou/chenx221/dao/impl/StudentDaoImpl.java b/project/src/main/java/cyou/chenx221/dao/impl/StudentDaoImpl.java
index 73269b5..3e57511 100644
--- a/project/src/main/java/cyou/chenx221/dao/impl/StudentDaoImpl.java
+++ b/project/src/main/java/cyou/chenx221/dao/impl/StudentDaoImpl.java
@@ -1,6 +1,42 @@
 package cyou.chenx221.dao.impl;
 
 import cyou.chenx221.dao.StudentDao;
+import cyou.chenx221.modal.Student;
+import org.apache.ibatis.session.SqlSession;
+import org.springframework.stereotype.Repository;
 
+import java.util.List;
+
+@Repository
 public class StudentDaoImpl implements StudentDao {
+    private final SqlSession sqlSession;
+
+    public StudentDaoImpl(SqlSession sqlSession) {
+        this.sqlSession = sqlSession;
+    }
+
+    @Override
+    public void addStudent(Student student) {
+        sqlSession.insert("StudentMapper.addStudent", student);
+    }
+
+    @Override
+    public void updateStudent(Student student) {
+        sqlSession.update("StudentMapper.updateStudent", student);
+    }
+
+    @Override
+    public void deleteStudent(int studentId) {
+        sqlSession.delete("StudentMapper.deleteStudent", studentId);
+    }
+
+    @Override
+    public Student getStudentById(int studentId) {
+        return sqlSession.selectOne("StudentMapper.getStudentById", studentId);
+    }
+
+    @Override
+    public List<Student> getAllStudents() {
+        return sqlSession.selectList("StudentMapper.getAllStudents");
+    }
 }