diff --git a/src/model/http_body/common.rs b/src/model/http_body/common.rs
index 4df7526..5a98c74 100644
--- a/src/model/http_body/common.rs
+++ b/src/model/http_body/common.rs
@@ -1,7 +1,88 @@
-use serde::{Serialize,Deserialize};
+use serde::{Deserialize, Serialize};
+use std::fmt::{Display, Formatter, Result as FmtResult};
+use std::num::ParseIntError;
+use std::str::FromStr;
 
 #[derive(Serialize)]
 pub struct SimpleResponse {
     pub code: i64,
     pub message: String,
-}
\ No newline at end of file
+}
+
+#[derive(Debug)]
+pub struct OptionalI64(pub Option<i64>);
+
+impl OptionalI64 {
+    // 构造函数：从 i64 创建 Some
+    pub fn new(value: i64) -> Self {
+        OptionalI64(Some(value))
+    }
+
+    // 构造函数：直接创建 None
+    pub fn none() -> Self {
+        OptionalI64(None)
+    }
+
+    // 从 Option<i64> 转换
+    pub fn from_option(value: Option<i64>) -> Self {
+        OptionalI64(value)
+    }
+}
+
+impl From<i64> for OptionalI64 {
+    fn from(value: i64) -> Self {
+        OptionalI64(Some(value))
+    }
+}
+impl From<Option<i64>> for OptionalI64 {
+    fn from(value: Option<i64>) -> Self {
+        OptionalI64(value)
+    }
+}
+
+impl FromStr for OptionalI64 {
+    type Err = std::num::ParseIntError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        if s.is_empty() || s.eq_ignore_ascii_case("null") {
+            Ok(OptionalI64(None))
+        } else {
+            s.parse::<i64>().map(|n| OptionalI64(Some(n)))
+        }
+    }
+}
+
+impl Display for OptionalI64 {
+    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
+        match self.0 {
+            Some(num) => write!(f, "{}", num), // 有值时输出数字
+            None => write!(f, ""),             // None 时输出空字符串
+        }
+    }
+}
+
+pub mod number_stringify {
+    use std::fmt::Display;
+    use std::str::FromStr;
+
+    use serde::{de, Deserialize, Deserializer, Serializer};
+
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Display,
+        S: Serializer,
+    {
+        serializer.collect_str(value)
+    }
+
+    pub fn deserialize<'de, T, D>(deserializer: D) -> Result<T, D::Error>
+    where
+        T: FromStr,
+        T::Err: Display,
+        D: Deserializer<'de>,
+    {
+        String::deserialize(deserializer)?
+            .parse()
+            .map_err(de::Error::custom)
+    }
+}