Support USING SERVICE LEVEL in SelectBuilder

qb/select.go

@@ -33,7 +33,7 @@
 }
 
 // SelectBuilder builds CQL SELECT statements.
 type SelectBuilder struct {
 	limit             limit
 	limitPerPartition limit
 	table             string
@@ -175,6 +175,12 @@
 	return b
 }
 
+// ServiceLevel adds a USING SERVICE LEVEL clause with the given name to the query
+func (b *SelectBuilder) ServiceLevel(name string) *SelectBuilder {
+	b.using.ServiceLevel(name)
+	return b
+}
+
 // Where adds an expression to the WHERE clause of the query. Expressions are
 // ANDed together in the generated CQL.
 func (b *SelectBuilder) Where(w ...Cmp) *SelectBuilder {

qb/using.go

@@ -7,6 +7,7 @@
 import (
 	"bytes"
 	"fmt"
+	"strings"
 	"time"
 )
 
@@ -20,13 +21,14 @@
 	return t.UnixNano() / 1000
 }
 
 type using struct {
 	ttlName       string
 	timestampName string
 	timeoutName   string
 	ttl           int64
 	timestamp     int64
 	timeout       time.Duration
+	serviceLevel  string
 }
 
 func (u *using) TTL(d time.Duration) *using {
@@ -68,6 +70,11 @@
 	return u
 }
 
+func (u *using) ServiceLevel(name string) *using {
+	u.serviceLevel = name
+	return u
+}
+
 func (u *using) writeCql(cql *bytes.Buffer) (names []string) {
 	writePreamble := u.preambleWriter()
 
@@ -101,6 +108,11 @@
 		names = append(names, u.timeoutName)
 	}
 
+	if u.serviceLevel != "" {
+		writePreamble(cql)
+		fmt.Fprintf(cql, "SERVICE LEVEL '%s' ", strings.ReplaceAll(u.serviceLevel, "'", "''"))
+	}
+
 	return
 }
 

qb/using_test.go

@@ -143,6 +143,21 @@ func TestUsing(t *testing.T) {
 			B: new(using).TimestampNamed("ts").Timestamp(time.Date(2005, 5, 5, 0, 0, 0, 0, time.UTC)),
 			S: "USING TIMESTAMP 1115251200000000 ",
 		},
+		// ServiceLevel
+		{
+			B: new(using).ServiceLevel("foo"),
+			S: "USING SERVICE LEVEL 'foo' ",
+		},
+		// ServiceLevel with additional Timeout
+		{
+			B: new(using).ServiceLevel("foo").Timeout(time.Second),
+			S: "USING TIMEOUT 1s AND SERVICE LEVEL 'foo' ",
+		},
+		// ServiceLevel with a silly, but legal, name
+		{
+			B: new(using).ServiceLevel(`^&*^\!@#&($%^!';[](+`),
+			S: `USING SERVICE LEVEL '^&*^\!@#&($%^!'';[](+' `,
+		},
 	}
 
 	for _, test := range table {