Add timestamp support

But not to NullTime because of text vs binary encoding difficulties.

You really should never use timestamp anyway.

conn.go

@@ -438,7 +438,7 @@ func (c *Conn) sendPreparedQuery(ps *PreparedStatement, arguments ...interface{}
 			switch oid {
 			case BoolOid, ByteaOid, Int2Oid, Int4Oid, Int8Oid, Float4Oid, Float8Oid, TimestampTzOid:
 				wbuf.WriteInt16(BinaryFormatCode)
-			case TextOid, VarcharOid, DateOid:
+			case TextOid, VarcharOid, DateOid, TimestampOid:
 				wbuf.WriteInt16(TextFormatCode)
 			default:
 				return SerializationError(fmt.Sprintf("Parameter %d oid %d is not a core type and argument type %T does not implement TextEncoder or BinaryEncoder", i, oid, arg))
@@ -488,6 +488,8 @@ func (c *Conn) sendPreparedQuery(ps *PreparedStatement, arguments ...interface{}
 				err = encodeDate(wbuf, arguments[i])
 			case TimestampTzOid:
 				err = encodeTimestampTz(wbuf, arguments[i])
+			case TimestampOid:
+				err = encodeTimestamp(wbuf, arguments[i])
 			default:
 				return SerializationError(fmt.Sprintf("%T is not a core type and it does not implement TextEncoder or BinaryEncoder", arg))
 			}

query.go

@@ -199,10 +199,17 @@ func (rows *Rows) Scan(dest ...interface{}) (err error) {
 		case *float64:
 			*d = decodeFloat8(rows, fd, size)
 		case *time.Time:
-			if fd.DataType == DateOid {
+			switch fd.DataType {
+			case DateOid:
 				*d = decodeDate(rows, fd, size)
-			} else {
+			case TimestampTzOid:
 				*d = decodeTimestampTz(rows, fd, size)
+			case TimestampOid:
+				*d = decodeTimestamp(rows, fd, size)
+			default:
+				err = fmt.Errorf("Can't convert OID %v to time.Time", fd.DataType)
+				rows.Fatal(err)
+				return err
 			}
 
 		case Scanner:
@@ -254,6 +261,8 @@ func (rows *Rows) Values() ([]interface{}, error) {
 			values = append(values, decodeDate(rows, fd, size))
 		case TimestampTzOid:
 			values = append(values, decodeTimestampTz(rows, fd, size))
+		case TimestampOid:
+			values = append(values, decodeTimestamp(rows, fd, size))
 		default:
 			// if it is not an intrinsic type then return the text
 			switch fd.FormatCode {

query_test.go

@@ -387,6 +387,7 @@ func TestQueryRowCoreTypes(t *testing.T) {
 		{"select $1::float8", []interface{}{float64(1.23)}, []interface{}{&actual.f64}, allTypes{f64: 1.23}},
 		{"select $1::bool", []interface{}{true}, []interface{}{&actual.b}, allTypes{b: true}},
 		{"select $1::timestamptz", []interface{}{time.Unix(123, 5000)}, []interface{}{&actual.t}, allTypes{t: time.Unix(123, 5000)}},
+		{"select $1::timestamp", []interface{}{time.Date(2010, 1, 2, 3, 4, 5, 0, time.Local)}, []interface{}{&actual.t}, allTypes{t: time.Date(2010, 1, 2, 3, 4, 5, 0, time.Local)}},
 		{"select $1::date", []interface{}{time.Date(1987, 1, 2, 0, 0, 0, 0, time.Local)}, []interface{}{&actual.t}, allTypes{t: time.Date(1987, 1, 2, 0, 0, 0, 0, time.Local)}},
 	}
 

values.go

@@ -22,6 +22,7 @@ const (
 	Float8Oid      = 701
 	VarcharOid     = 1043
 	DateOid        = 1082
+	TimestampOid   = 1114
 	TimestampTzOid = 1184
 )
 
@@ -366,10 +367,15 @@ type NullTime struct {
 }
 
 func (n *NullTime) Scan(rows *Rows, fd *FieldDescription, size int32) error {
+	if fd.DataType != TimestampTzOid {
+		return SerializationError(fmt.Sprintf("NullTime.EncodeBinary cannot encode into OID %d", fd.DataType))
+	}
+
 	if size == -1 {
 		n.Time, n.Valid = time.Time{}, false
 		return nil
 	}
+
 	n.Valid = true
 	n.Time = decodeTimestampTz(rows, fd, size)
 
@@ -962,3 +968,41 @@ func encodeTimestampTz(w *WriteBuf, value interface{}) error {
 
 	return nil
 }
+
+func decodeTimestamp(rows *Rows, fd *FieldDescription, size int32) time.Time {
+	var zeroTime time.Time
+
+	if fd.DataType != TimestampOid {
+		rows.Fatal(ProtocolError(fmt.Sprintf("Expected type oid %v but received type oid %v", TimestampOid, fd.DataType)))
+		return zeroTime
+	}
+
+	switch fd.FormatCode {
+	case TextFormatCode:
+		s := rows.mr.ReadString(size)
+		t, err := time.ParseInLocation("2006-01-02 15:04:05.999999", s, time.Local)
+		if err != nil {
+			rows.Fatal(ProtocolError(fmt.Sprintf("Can't decode timestamp: %v - %v", err, s)))
+			return zeroTime
+		}
+		return t
+	case BinaryFormatCode:
+		rows.Fatal(ProtocolError("Can't decode binary timestamp"))
+		return zeroTime
+	default:
+		rows.Fatal(ProtocolError(fmt.Sprintf("Unknown field description format code: %v", fd.FormatCode)))
+		return zeroTime
+	}
+}
+
+func encodeTimestamp(w *WriteBuf, value interface{}) error {
+	t, ok := value.(time.Time)
+	if !ok {
+		return fmt.Errorf("Expected time.Time, received %T", value)
+	}
+
+	s := t.Format("2006-01-02 15:04:05.999999")
+	return encodeText(w, s)
+
+	return nil
+}