增加了用户支付次数，购买次数等字段维护

api/dao/User.go

@@ -115,3 +115,21 @@ func (r *UserDao) GetUserListByMemberValidTime(maps interface{}, startTime, endT
 	}
 	return m, nil
 }
+
+// Inc 自增
+func (r *UserDao) Inc(tx *gorm.DB, userId int64, field string, numeral int) error {
+	err := tx.Model(&model.User{}).Where("user_id = ?", userId).UpdateColumn(field, gorm.Expr(field+" + ?", numeral)).Error
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// Dec 自减
+func (r *UserDao) Dec(tx *gorm.DB, userId int64, field string, numeral int) error {
+	err := tx.Model(&model.User{}).Where("user_id = ?", userId).UpdateColumn(field, gorm.Expr(field+" - ?", numeral)).Error
+	if err != nil {
+		return err
+	}
+	return nil
+}