Add SqliteStatement.named_query.

src/named_params.rs

@@ -4,7 +4,7 @@ use libc::{c_int};
 
 use super::ffi;
 
-use {SqliteResult, SqliteError, SqliteConnection, SqliteStatement};
+use {SqliteResult, SqliteError, SqliteConnection, SqliteStatement, SqliteRows};
 use types::{ToSql};
 
 impl SqliteConnection {
@@ -44,6 +44,24 @@ impl<'conn> SqliteStatement<'conn> {
     /// `sqlite3_changes`).
     pub fn named_execute(&mut self, params: &[(&str, &ToSql)]) -> SqliteResult<c_int> {
         unsafe {
+            try!(self.bind_named_parameters(params));
+            self.execute_()
+        }
+    }
+
+    /// Execute the prepared statement with named parameter(s), returning an iterator over the resulting rows.
+    pub fn named_query<'a>(&'a mut self, params: &[(&str, &ToSql)]) -> SqliteResult<SqliteRows<'a>> {
+        self.reset_if_needed();
+
+        unsafe {
+            try!(self.bind_named_parameters(params));
+        }
+
+        self.needs_reset = true;
+        Ok(SqliteRows::new(self))
+    }
+
+    unsafe fn bind_named_parameters(&mut self, params: &[(&str, &ToSql)]) -> SqliteResult<()> {
         for &(name, value) in params {
             let i = try!(self.parameter_index(name).ok_or(SqliteError{
                 code: ffi::SQLITE_MISUSE,
@@ -51,8 +69,7 @@ impl<'conn> SqliteStatement<'conn> {
             }));
             try!(self.conn.decode_result(value.bind_parameter(self.stmt, i)));
         }
-            self.execute_()
-        }
+        Ok(())
     }
 }
 
@@ -69,4 +86,14 @@ mod test {
         let mut stmt = db.prepare("INSERT INTO test (id, name, flag) VALUES (:id, :name, :flag)").unwrap();
         stmt.named_execute(&[(":name", &"one")]).unwrap();
     }
+
+   #[test]
+    fn test_named_query() {
+        let db = SqliteConnection::open_in_memory().unwrap();
+        let sql = "CREATE TABLE test (id INTEGER PRIMARY KEY NOT NULL, name TEXT NOT NULL, flag INTEGER)";
+        db.execute_batch(sql).unwrap();
+
+        let mut stmt = db.prepare("SELECT * FROM test where name = :name").unwrap();
+        stmt.named_query(&[(":name", &"one")]).unwrap();
+    }
 }