删除：未使用代码

src/dao/impl/StudentDAOImpl.java

@@ -75,35 +75,6 @@ public class StudentDAOImpl implements StudentDAO {
         }
     }
 
-    /**
-     * 更新学生信息
-     * 根据学生对象的ID更新其他字段的值
-     * 
-     * @param student 包含更新信息的学生对象
-     * @return 影响的行数，更新成功返回1，失败返回0
-     */
-    @Override
-    public int update(Student student) {
-        String sql = "UPDATE students SET student_id = ?, name = ?, class_name = ?, contact = ?, college = ?, major = ?, password = ? WHERE id = ?";
-        try (Connection conn = DatabaseUtil.getConnection();
-             PreparedStatement stmt = conn.prepareStatement(sql)) {
-            
-            // 设置预处理语句的参数
-            stmt.setString(1, student.getStudentId());
-            stmt.setString(2, student.getName());
-            stmt.setString(3, student.getClassName());
-            stmt.setString(4, student.getContact());
-            stmt.setString(5, student.getCollege());
-            stmt.setString(6, student.getMajor());
-            stmt.setString(7, student.getPassword());
-            stmt.setInt(8, student.getId());
-            
-            return stmt.executeUpdate();
-        } catch (SQLException e) {
-            e.printStackTrace();
-            return 0;
-        }
-    }
 
     /**
      * 根据ID查询学生信息