Add db-connect, a SQL over HTTPS server

vendor/github.com/kshvakov/clickhouse/lib/column/date.go

@@ -0,0 +1,80 @@
+package column
+
+import (
+	"time"
+
+	"github.com/kshvakov/clickhouse/lib/binary"
+)
+
+type Date struct {
+	base
+	Timezone *time.Location
+	offset   int64
+}
+
+func (dt *Date) Read(decoder *binary.Decoder) (interface{}, error) {
+	sec, err := decoder.Int16()
+	if err != nil {
+		return nil, err
+	}
+	return time.Unix(int64(sec)*24*3600-dt.offset, 0).In(dt.Timezone), nil
+}
+
+func (dt *Date) Write(encoder *binary.Encoder, v interface{}) error {
+	var timestamp int64
+	switch value := v.(type) {
+	case time.Time:
+		_, offset := value.Zone()
+		timestamp = value.Unix() + int64(offset)
+	case int16:
+		return encoder.Int16(value)
+	case int32:
+		timestamp = int64(value) + dt.offset
+	case int64:
+		timestamp = value + dt.offset
+	case string:
+		var err error
+		timestamp, err = dt.parse(value)
+		if err != nil {
+			return err
+		}
+
+	// this relies on Nullable never sending nil values through
+	case *time.Time:
+		_, offset := value.Zone()
+		timestamp = (*value).Unix() + int64(offset)
+	case *int16:
+		return encoder.Int16(*value)
+	case *int32:
+		timestamp = int64(*value) + dt.offset
+	case *int64:
+		timestamp = *value + dt.offset
+	case *string:
+		var err error
+		timestamp, err = dt.parse(*value)
+		if err != nil {
+			return err
+		}
+
+	default:
+		return &ErrUnexpectedType{
+			T:      v,
+			Column: dt,
+		}
+	}
+
+	return encoder.Int16(int16(timestamp / 24 / 3600))
+}
+
+func (dt *Date) parse(value string) (int64, error) {
+	tv, err := time.Parse("2006-01-02", value)
+	if err != nil {
+		return 0, err
+	}
+	return time.Date(
+		time.Time(tv).Year(),
+		time.Time(tv).Month(),
+		time.Time(tv).Day(),
+		0, 0, 0, 0, time.UTC,
+	).Unix(), nil
+}