let limit and offset use bind parameter

clause/limit.go

@@ -1,7 +1,5 @@
 package clause
 
-import "strconv"
-
 // Limit limit clause
 type Limit struct {
 	Limit  *int
@@ -17,14 +15,16 @@ func (limit Limit) Name() string {
 func (limit Limit) Build(builder Builder) {
 	if limit.Limit != nil && *limit.Limit >= 0 {
 		builder.WriteString("LIMIT ")
-		builder.WriteString(strconv.Itoa(*limit.Limit))
+		// builder.WriteString(strconv.Itoa(*limit.Limit))
+		builder.AddVar(builder, *limit.Limit)
 	}
 	if limit.Offset > 0 {
 		if limit.Limit != nil && *limit.Limit >= 0 {
 			builder.WriteByte(' ')
 		}
 		builder.WriteString("OFFSET ")
-		builder.WriteString(strconv.Itoa(limit.Offset))
+		builder.AddVar(builder, limit.Offset)
+		// builder.WriteString(strconv.Itoa(limit.Offset))
 	}
 }
 

clause/limit_test.go

@@ -22,43 +22,43 @@ func TestLimit(t *testing.T) {
 				Limit:  &limit10,
 				Offset: 20,
 			}},
-			"SELECT * FROM `users` LIMIT 10 OFFSET 20", nil,
+			"SELECT * FROM `users` LIMIT ? OFFSET ?", []interface{}{limit10, 20},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: &limit0}},
-			"SELECT * FROM `users` LIMIT 0", nil,
+			"SELECT * FROM `users` LIMIT ?", []interface{}{limit0},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: &limit0}, clause.Limit{Offset: 0}},
-			"SELECT * FROM `users` LIMIT 0", nil,
+			"SELECT * FROM `users` LIMIT ?", []interface{}{limit0},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Offset: 20}},
-			"SELECT * FROM `users` OFFSET 20", nil,
+			"SELECT * FROM `users` OFFSET ?", []interface{}{20},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Offset: 20}, clause.Limit{Offset: 30}},
-			"SELECT * FROM `users` OFFSET 30", nil,
+			"SELECT * FROM `users` OFFSET ?", []interface{}{30},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Offset: 20}, clause.Limit{Limit: &limit10}},
-			"SELECT * FROM `users` LIMIT 10 OFFSET 20", nil,
+			"SELECT * FROM `users` LIMIT ? OFFSET ?", []interface{}{limit10, 20},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: &limit10, Offset: 20}, clause.Limit{Offset: 30}},
-			"SELECT * FROM `users` LIMIT 10 OFFSET 30", nil,
+			"SELECT * FROM `users` LIMIT ? OFFSET ?", []interface{}{limit10, 30},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: &limit10, Offset: 20}, clause.Limit{Offset: 30}, clause.Limit{Offset: -10}},
-			"SELECT * FROM `users` LIMIT 10", nil,
+			"SELECT * FROM `users` LIMIT ?", []interface{}{limit10},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: &limit10, Offset: 20}, clause.Limit{Offset: 30}, clause.Limit{Limit: &limitNeg10}},
-			"SELECT * FROM `users` OFFSET 30", nil,
+			"SELECT * FROM `users` OFFSET ?", []interface{}{30},
 		},
 		{
 			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: &limit10, Offset: 20}, clause.Limit{Offset: 30}, clause.Limit{Limit: &limit50}},
-			"SELECT * FROM `users` LIMIT 50 OFFSET 30", nil,
+			"SELECT * FROM `users` LIMIT ? OFFSET ?", []interface{}{limit50, 30},
 		},
 	}