mysql: added a helper to compare UUID strings with uuid_to_bin

mysql/literal.go

@@ -1,8 +1,10 @@
 package mysql
 
 import (
-	"github.com/go-jet/jet/v2/internal/jet"
+	"fmt"
 	"time"
+
+	"github.com/go-jet/jet/v2/internal/jet"
 )
 
 // Keywords
@@ -55,6 +57,17 @@ var String = jet.String
 // value can be any uuid type with a String method
 var UUID = jet.UUID
 
+// UUIDToBin takes ay object with a String method and calls StringUUIDToBin.
+func UUIDToBin(str fmt.Stringer) StringExpression {
+	return StringUUIDToBin(str.String())
+}
+
+// StringUUIDToBin is a helper function that calls "uuid_to_bin" function on the passed value.
+func StringUUIDToBin(str string) StringExpression {
+	fn := Func("uuid_to_bin", String(str))
+	return StringExp(fn)
+}
+
 // Date creates new date literal
 func Date(year int, month time.Month, day int) DateExpression {
 	return CAST(jet.Date(year, month, day)).AS_DATE()

mysql/literal_test.go

@@ -4,6 +4,8 @@ import (
 	"math"
 	"testing"
 	"time"
+
+	"github.com/google/uuid"
 )
 
 func TestBool(t *testing.T) {
@@ -81,3 +83,11 @@ func TestTimestamp(t *testing.T) {
 	assertSerialize(t, Timestamp(2010, time.March, 30, 10, 15, 30), `TIMESTAMP(?)`, "2010-03-30 10:15:30")
 	assertSerialize(t, TimestampT(time.Now()), `TIMESTAMP(?)`)
 }
+
+func TestUUIDToBin(t *testing.T) {
+	assertSerialize(t, UUIDToBin(uuid.Nil), `uuid_to_bin(?)`, uuid.Nil.String())
+}
+
+func TestStringUUIDToBin(t *testing.T) {
+	assertSerialize(t, StringUUIDToBin(uuid.Nil.String()), `uuid_to_bin(?)`, uuid.Nil.String())
+}