qb: insert

qb/expr.go

@@ -0,0 +1,36 @@
+package qb
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+	"time"
+)
+
+type expr interface {
+	// WriteCql writes a CQL representation of the expr to a buffer and returns
+	// slice of parameter names.
+	WriteCql(cql *bytes.Buffer) (names []string)
+}
+
+type using struct {
+	timestamp time.Time
+	ttl       time.Duration
+}
+
+func (u using) WriteCql(cql *bytes.Buffer) (names []string) {
+	var v []string
+	if !u.timestamp.IsZero() {
+		v = append(v, fmt.Sprint("TIMESTAMP ", u.timestamp.UnixNano()/1000))
+	}
+	if u.ttl != 0 {
+		v = append(v, fmt.Sprint("TTL ", int(u.ttl.Seconds())))
+	}
+	if len(v) > 0 {
+		cql.WriteString("USING ")
+		cql.WriteString(strings.Join(v, ","))
+		cql.WriteString(" ")
+	}
+
+	return
+}