Return error message from SQLite

src/lib.rs

@@ -8,10 +8,24 @@ macro_rules! raise(
 );
 
 macro_rules! success(
+    ($result:expr, $database:expr) => (
+        match $result {
+            ::raw::SQLITE_OK => {},
+            code => match ::Error::last($database) {
+                Some(error) => return Err(error),
+                None => return Err(::Error::from(::result::code_from_raw(code))),
+            },
+        }
+    );
     ($result:expr) => (
         match $result {
             ::raw::SQLITE_OK => {},
-            code => return Err(::Error::from(::result::code_from_raw(code))),
+            code => return Err(::Error {
+                code: ::result::code_from_raw(code),
+                message: Some(c_str_to_string!(unsafe {
+                    ::raw::sqlite3_errstr(code)
+                })),
+            }),
         }
     );
 );

tests/lib.rs

@@ -55,6 +55,17 @@ fn workflow() {
     }
 }
 
+#[test]
+fn failure() {
+    let (path, _directory) = setup();
+    let mut database = ok!(sqlite::open(&path));
+    match database.execute(":)", None) {
+        Err(error) => assert_eq!(error.message,
+                                 Some(String::from("SQL logic error or missing database"))),
+        _ => assert!(false),
+    }
+}
+
 fn setup() -> (PathBuf, Directory) {
     let directory = ok!(Directory::new("sqlite"));
     (directory.path().join("database.sqlite3"), directory)