Add deserialize api

Author: wyhaya

README.md

@@ -1,4 +1,4 @@
-# crossdb-rs
+# crossdb-rust
 
 ```toml
 [dependencies]
@@ -31,9 +31,3 @@ fn main() -> Result<()> {
     Ok(())
 }
 ```
-
-## TODO
-
-- NULL value
-- Dynamic link crossdb
-- use serde to serialize/deserialize

src/lib.rs

@@ -26,6 +26,7 @@ pub use value::Value;
 
 use crossdb_sys::*;
 use lru::LruCache;
+use serde::de::{value::Error as DeError, DeserializeOwned};
 use std::ffi::{CStr, CString};
 use std::fmt::Display;
 use std::num::NonZeroUsize;
@@ -156,6 +157,18 @@ impl Query {
         Some(Row { columns, values })
     }
 
+    pub fn fetch_row_as<T: DeserializeOwned>(&mut self) -> Option<Result<T, DeError>> {
+        self.fetch_row().map(|row| row.deserialize())
+    }
+
+    pub fn fetch_rows_as<'a, T: DeserializeOwned>(mut self) -> Result<Vec<T>, DeError> {
+        let mut rows = Vec::with_capacity(self.row_count());
+        while let Some(row) = self.fetch_row() {
+            rows.push(row.deserialize()?);
+        }
+        Ok(rows)
+    }
+
     fn inner_fetch_row_values(&mut self) -> Option<Vec<Value<'_>>> {
         unsafe {
             let row = xdb_fetch_row(self.ptr);