Add Error::last

src/database.rs

@@ -60,10 +60,15 @@ impl<'l> Database<'l> {
 impl<'l> Drop for Database<'l> {
     #[inline]
     fn drop(&mut self) {
-        unsafe { ::raw::sqlite3_close(self.raw) };
+        unsafe { raw::sqlite3_close(self.raw) };
     }
 }
 
+#[inline]
+pub fn as_raw(database: &mut Database) -> *mut raw::sqlite3 {
+    database.raw
+}
+
 extern fn execute_callback(callback: *mut c_void, count: c_int, values: *mut *mut c_char,
                            columns: *mut *mut c_char) -> c_int {
 

src/error.rs

@@ -1,7 +1,8 @@
-use ResultCode;
-
+use raw;
 use std::convert::{From, Into};
 
+use {Database, ResultCode};
+
 /// An error.
 #[derive(Debug)]
 pub struct Error {
@@ -9,6 +10,26 @@ pub struct Error {
     pub message: Option<String>,
 }
 
+impl Error {
+    /// Return the last occurred error if any.
+    pub fn last(database: &mut Database) -> Option<Error> {
+        unsafe {
+            let code = raw::sqlite3_errcode(::database::as_raw(database));
+            if code == raw::SQLITE_OK {
+                return None;
+            }
+            let message = raw::sqlite3_errmsg(::database::as_raw(database));
+            if message.is_null() {
+                return None;
+            }
+            Some(Error {
+                code: ::result::code_from_raw(code),
+                message: Some(c_str_to_string!(message)),
+            })
+        }
+    }
+}
+
 impl<T> From<T> for Error where T: Into<String> {
     #[inline]
     fn from(message: T) -> Error {