Add Statement::columns

src/lib.rs

@@ -58,7 +58,7 @@ macro_rules! raise(
 macro_rules! error(
     ($connection:expr, $code:expr) => (match ::error::last($connection) {
         Some(error) => return Err(error),
-        None => return Err(::Error::from(::ErrorKind::from($code as isize))),
+        _ => return Err(::Error::from(::ErrorKind::from($code as isize))),
     });
 );
 

src/statement.rs

@@ -36,6 +36,12 @@ pub trait Value {
 }
 
 impl<'l> Statement<'l> {
+    /// Return the number of columns.
+    #[inline]
+    pub fn columns(&mut self) -> usize {
+        unsafe { ffi::sqlite3_column_count(self.raw.0) as usize }
+    }
+
     /// Bind the parameter at a specific location.
     ///
     /// The leftmost location has the index 1.