first commit

internal/mysqldao/refund.go

@@ -0,0 +1,85 @@
+package mysqldao
+
+import (
+	"context"
+
+	"git.lzcwy.cn/zhengchiliu/zt-closet-manage-backend/global"
+	"git.lzcwy.cn/zhengchiliu/zt-closet-manage-backend/internal/mysqlmodel"
+	"gorm.io/gorm"
+)
+
+// RefundDao 退款单数据访问
+type RefundDao struct {
+	db *gorm.DB
+}
+
+// NewRefundDao 创建退款 DAO
+func NewRefundDao() *RefundDao {
+	return &RefundDao{db: global.MysqlEngine}
+}
+
+// RefundListParams 退款单分页列表筛选参数。
+type RefundListParams struct {
+	Status     int8   // 退款状态（WithStatus 为 true 时生效）
+	WithStatus bool   // 是否按状态筛选（退款状态 0=待处理 是合法值，需显式区分「不过滤」）
+	OrderNo    string // 订单号（精确）
+	Page       int
+	Size       int
+}
+
+// RefundList 分页查询退款单
+func (d *RefundDao) RefundList(ctx context.Context, p RefundListParams) ([]mysqlmodel.RefundFlowLog, int64, error) {
+	ctx, span := global.Tracer.Start(ctx, "mysqldao.RefundList")
+	defer span.End()
+
+	var list []mysqlmodel.RefundFlowLog
+	var total int64
+	q := d.db.WithContext(ctx).Model(&mysqlmodel.RefundFlowLog{})
+	if p.WithStatus {
+		q = q.Where("status = ?", p.Status)
+	}
+	if p.OrderNo != "" {
+		q = q.Where("order_no = ?", p.OrderNo)
+	}
+	if err := q.Count(&total).Error; err != nil {
+		span.RecordError(err)
+		return nil, 0, err
+	}
+	if err := q.Offset((p.Page - 1) * p.Size).Limit(p.Size).Order("id DESC").Find(&list).Error; err != nil {
+		span.RecordError(err)
+		return nil, 0, err
+	}
+	return list, total, nil
+}
+
+// RefundGetByRefundNo 按退款单号查询
+func (d *RefundDao) RefundGetByRefundNo(ctx context.Context, refundNo string) (*mysqlmodel.RefundFlowLog, error) {
+	ctx, span := global.Tracer.Start(ctx, "mysqldao.RefundGetByRefundNo")
+	defer span.End()
+
+	var refund mysqlmodel.RefundFlowLog
+	if err := d.db.WithContext(ctx).Where("refund_no = ?", refundNo).First(&refund).Error; err != nil {
+		span.RecordError(err)
+		return nil, err
+	}
+	return &refund, nil
+}
+
+// RefundTransition 条件更新退款状态（仅 from 状态可流转到 to，行锁防并发重复审核）。
+func (d *RefundDao) RefundTransition(ctx context.Context, refundNo string, from, to int8, failReason string) (bool, error) {
+	ctx, span := global.Tracer.Start(ctx, "mysqldao.RefundTransition")
+	defer span.End()
+
+	updates := map[string]any{"status": to}
+	if failReason != "" {
+		updates["fail_reason"] = failReason
+	}
+	res := d.db.WithContext(ctx).Model(&mysqlmodel.RefundFlowLog{}).
+		Where("refund_no = ? AND status = ?", refundNo, from).
+		Updates(updates)
+	if res.Error != nil {
+		span.RecordError(res.Error)
+		return false, res.Error
+	}
+	return res.RowsAffected > 0, nil
+}