商品管理ui优化, 后台支持分页参数

backend/internal/modules/listing/repository.go

@@ -170,13 +170,47 @@ func (r *Repository) ListPendingReview() ([]ListingDTO, error) {
 	return rowsToDTO(rows), nil
 }
 
-func (r *Repository) ListAdmin(query AdminListQuery) ([]ListingDTO, error) {
-	limit := query.Limit
-	if limit <= 0 || limit > 500 {
-		limit = 200
+func (r *Repository) ListAdmin(query AdminListQuery) (*AdminListResult, error) {
+	page := query.Page
+	if page <= 0 {
+		page = 1
+	}
+	pageSize := query.PageSize
+	if pageSize <= 0 {
+		pageSize = query.Limit
+	}
+	if pageSize <= 0 {
+		pageSize = 20
+	}
+	if pageSize > 100 {
+		pageSize = 100
 	}
 
-	db := r.baseQuery()
+	countDB := r.applyAdminListFilters(r.db.Table("rental_listings AS l"), query)
+	var total int64
+	if err := countDB.Count(&total).Error; err != nil {
+		return nil, err
+	}
+
+	db := r.applyAdminListFilters(r.baseQuery(), query)
+	offset := (page - 1) * pageSize
+	if offset < 0 {
+		offset = 0
+	}
+	var rows []listingRow
+	err := db.Order("l.id DESC").Limit(pageSize).Offset(offset).Scan(&rows).Error
+	if err != nil {
+		return nil, err
+	}
+	return &AdminListResult{
+		Items:    rowsToDTO(rows),
+		Total:    total,
+		Page:     page,
+		PageSize: pageSize,
+	}, nil
+}
+
+func (r *Repository) applyAdminListFilters(db *gorm.DB, query AdminListQuery) *gorm.DB {
 	if query.OwnerID > 0 {
 		db = db.Where("l.owner_id = ?", query.OwnerID)
 	}
@@ -186,13 +220,7 @@ func (r *Repository) ListAdmin(query AdminListQuery) ([]ListingDTO, error) {
 	if query.ReviewStatus != "" {
 		db = db.Where("l.review_status = ?", query.ReviewStatus)
 	}
-
-	var rows []listingRow
-	err := db.Order("l.id DESC").Limit(limit).Scan(&rows).Error
-	if err != nil {
-		return nil, err
-	}
-	return rowsToDTO(rows), nil
+	return db
 }
 
 func (r *Repository) FindAdmin(listingID uint64) (*ListingDTO, error) {