diff --git a/src/main/java/uk/ac/cf/spring/demo/sports/Userdetail/userDao.java b/src/main/java/uk/ac/cf/spring/demo/sports/Userdetail/userDao.java
new file mode 100644
index 0000000000000000000000000000000000000000..bff08095c8b53a77ff19d413a7d070ed75a63694
--- /dev/null
+++ b/src/main/java/uk/ac/cf/spring/demo/sports/Userdetail/userDao.java
@@ -0,0 +1,70 @@
+package uk.ac.cf.spring.demo.sports.Userdetail;
+
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository  // 标注为 Spring 管理的 Bean
+public class userDao {
+
+    private final JdbcTemplate jdbcTemplate;
+
+    // 构造函数注入 JdbcTemplate
+    public userDao(JdbcTemplate jdbcTemplate) {
+        this.jdbcTemplate = jdbcTemplate;
+    }
+
+    // 获取所有用户
+    public List<User> getAllUsers() {
+        // 查询所有用户的 SQL 语句
+        String sql = "SELECT id, email, username FROM information";
+
+        // 执行查询并将结果映射到 User 对象
+        return jdbcTemplate.query(sql, (rs, rowNum) -> new User(
+                rs.getLong("id"),          // 获取 id
+                rs.getString("email"),     // 获取 email
+                rs.getString("username")   // 获取 username
+        ));
+    }
+
+    // 根据 ID 获取单个用户
+    public User getUserById(Long id) {
+        // 查询单个用户的 SQL 语句
+        String sql = "SELECT id, email, username FROM information WHERE id = ?";
+
+        // 执行查询并返回唯一的 User 对象
+        return jdbcTemplate.queryForObject(sql, new Object[]{id}, (rs, rowNum) -> new User(
+                rs.getLong("id"),          // 获取 id
+                rs.getString("email"),     // 获取 email
+                rs.getString("username")   // 获取 username
+        ));
+    }
+
+    // 添加一个新用户
+    public int addUser(User user) {
+        // 插入用户的 SQL 语句
+        String sql = "INSERT INTO information (email, username) VALUES (?, ?)";
+
+        // 执行插入操作并返回受影响的行数
+        return jdbcTemplate.update(sql, user.getEmail(), user.getUsername());
+    }
+
+    // 更新用户信息
+    public int updateUser(User user) {
+        // 更新用户的 SQL 语句
+        String sql = "UPDATE information SET email = ?, username = ? WHERE id = ?";
+
+        // 执行更新操作并返回受影响的行数
+        return jdbcTemplate.update(sql, user.getEmail(), user.getUsername(), user.getId());
+    }
+
+    // 删除用户
+    public int deleteUser(Long id) {
+        // 删除用户的 SQL 语句
+        String sql = "DELETE FROM information WHERE id = ?";
+
+        // 执行删除操作并返回受影响的行数
+        return jdbcTemplate.update(sql, id);
+    }
+}