diff --git a/internal/logic/orderservice/utils.go b/internal/logic/orderservice/utils.go
index ac30a7d..02c79fa 100644
--- a/internal/logic/orderservice/utils.go
+++ b/internal/logic/orderservice/utils.go
@@ -2,8 +2,23 @@ package orderservicelogic
 
 import (
 	"github.com/shopspring/decimal"
+	"github.com/zeromicro/go-zero/core/logx"
 )
 
+func decimalPtrFromString(val string) *decimal.Decimal {
+	if val == "" {
+		return nil
+	}
+	dec, err := decimal.NewFromString(val)
+	if err != nil {
+		logx.Errorf("Failed to convert string to decimal: %v", err)
+
+		return nil
+	}
+
+	return &dec
+}
+
 // getInt64Value 將 *int64 的值返回，如果為 nil 則返回 0
 func getInt64Value(val *int64) int64 {
 	if val == nil {