Boolean parameters transmitted as binary

Work towards #7.

src/test.rs

@@ -68,6 +68,30 @@ fn test_nulls() {
     };
 }
 
+#[test]
+fn test_binary_bool_params() {
+    let conn = PostgresConnection::connect("postgres://postgres@127.0.0.1:5432");
+
+    do conn.in_transaction |trans| {
+        trans.prepare("CREATE TABLE foo (
+                        id BIGINT PRIMARY KEY,
+                        b BOOL
+                       )").update([]);
+        trans.prepare("INSERT INTO foo (id, b) VALUES
+                        ($1, $2), ($3, $4), ($5, $6)")
+                .update([&1 as &ToSql, &true as &ToSql,
+                         &2 as &ToSql, &false as &ToSql,
+                         &3 as &ToSql, &None::<bool> as &ToSql]);
+        let stmt = trans.prepare("SELECT b FROM foo ORDER BY id");
+        let result = stmt.query([]);
+
+        assert_eq!(~[Some(true), Some(false), None],
+                   result.iter().map(|row| { row[0] }).collect());
+
+        trans.set_rollback();
+    }
+}
+
 #[test]
 fn test_wrong_num_params() {
     let conn = PostgresConnection::connect("postgres://postgres@127.0.0.1:5432");

src/types.rs

@@ -2,6 +2,9 @@ use std::str;
 
 pub type Oid = i32;
 
+// Values from pg_type.h
+static BOOLOID: Oid = 16;
+
 pub enum Format {
     Text = 0,
     Binary = 1
@@ -39,6 +42,23 @@ macro_rules! from_option_impl(
     )
 )
 
+impl FromSql for Option<bool> {
+    fn from_sql(raw: &Option<~[u8]>) -> Option<bool> {
+        match *raw {
+            None => None,
+            Some(ref buf) => {
+                assert_eq!(1, buf.len());
+                match buf[0] as char {
+                    't' => Some(true),
+                    'f' => Some(false),
+                    byte => fail!("Invalid byte: %?", byte)
+                }
+            }
+        }
+    }
+}
+from_option_impl!(bool)
+
 from_str_impl!(int)
 from_option_impl!(int)
 from_str_impl!(i8)
@@ -102,6 +122,17 @@ macro_rules! to_option_impl(
     )
 )
 
+impl ToSql for bool {
+    fn to_sql(&self, ty: Oid) -> (Format, Option<~[u8]>) {
+        if ty == BOOLOID {
+            (Binary, Some(~[*self as u8]))
+        } else {
+            (Text, Some(self.to_str().into_bytes()))
+        }
+    }
+}
+to_option_impl!(bool)
+
 to_str_impl!(int)
 to_option_impl!(int)
 to_str_impl!(i8)