导出系统

2026-06-15 15:28:29 +08:00
parent 2f0b24ce88
commit 7ec84fbc0f
17 changed files with 939 additions and 260 deletions
--- a/internal/exporter/datasource.go
+++ b/internal/exporter/datasource.go
@@ -0,0 +1,20 @@
+package exporter
+
+import "context"
+
+// DataSource 导出场景数据源接口。
+// 场景实现只负责统计、表头和按 offset/limit 拉取数据，分片调度由导出框架统一处理。
+type DataSource interface {
+	Scene() string
+	Count(ctx context.Context, params ExportParams) (int, error)
+	Headers(ctx context.Context, params ExportParams) ([]string, error)
+	Fetch(ctx context.Context, params ExportParams, offset, limit int) ([][]string, error)
+}
+
+// ExportParams 导出任务执行参数。
+// Filters 来自任务 query_json.filters，权限字段来自任务创建时的快照。
+type ExportParams struct {
+	Filters      map[string]any
+	ScopeShopIDs []uint
+	UserType     int
+}
--- a/internal/exporter/device_scene.go
+++ b/internal/exporter/device_scene.go
@@ -10,78 +10,53 @@ import (
 	"github.com/break/junhong_cmp_fiber/pkg/constants"
 )

-// DeviceSceneStrategy 设备导出场景策略。
-type DeviceSceneStrategy struct {
+// DeviceDataSource 设备导出数据源。
+type DeviceDataSource struct {
 	db *gorm.DB
 }

-// NewDeviceSceneStrategy 创建设备场景策略。
-func NewDeviceSceneStrategy(db *gorm.DB) *DeviceSceneStrategy {
-	return &DeviceSceneStrategy{db: db}
+// NewDeviceDataSource 创建设备导出数据源。
+func NewDeviceDataSource(db *gorm.DB) *DeviceDataSource {
+	return &DeviceDataSource{db: db}
 }

-// Scene 场景编码。
-func (s *DeviceSceneStrategy) Scene() string {
+// Scene 返回导出场景编码。
+func (s *DeviceDataSource) Scene() string {
 	return constants.ExportTaskSceneDevice
 }

-// Headers 导出表头。
-func (s *DeviceSceneStrategy) Headers() []string {
-	return []string{"ID", "设备虚拟号", "设备名称", "设备型号", "设备类型", "状态", "店铺ID", "创建时间"}
+// Count 统计设备导出行数。
+func (s *DeviceDataSource) Count(ctx context.Context, params ExportParams) (int, error) {
+	var total int64
+	query := s.applyFilters(s.db.WithContext(ctx).Model(&model.Device{}), params)
+	if err := query.Count(&total).Error; err != nil {
+		return 0, err
+	}
+	return int(total), nil
 }

-// NextShardBoundary 获取下一段分片边界。
-func (s *DeviceSceneStrategy) NextShardBoundary(ctx context.Context, task *model.ExportTask, afterID uint64, limit int) (*ShardBoundary, error) {
+// Headers 返回设备导出表头。
+func (s *DeviceDataSource) Headers(ctx context.Context, params ExportParams) ([]string, error) {
+	return []string{"ID", "设备虚拟号", "设备名称", "设备型号", "设备类型", "状态", "店铺ID", "创建时间"}, nil
+}
+
+// Fetch 按 offset/limit 查询设备导出数据。
+func (s *DeviceDataSource) Fetch(ctx context.Context, params ExportParams, offset, limit int) ([][]string, error) {
 	if limit <= 0 {
-		limit = constants.ExportDefaultShardSize
-	}
-
-	var ids []uint64
-	query := s.db.WithContext(ctx).
-		Model(&model.Device{}).
-		Where("id > ?", afterID).
-		Order("id ASC").
-		Limit(limit)
-	query = applyShopScopeForTask(query, task)
-
-	if err := query.Pluck("id", &ids).Error; err != nil {
-		return nil, err
-	}
-	if len(ids) == 0 {
-		return nil, nil
-	}
-
-	return &ShardBoundary{
-		StartID:  afterID,
-		EndID:    ids[len(ids)-1],
-		RowCount: len(ids),
-	}, nil
-}
-
-// QueryRows 查询分片内数据行。
-func (s *DeviceSceneStrategy) QueryRows(ctx context.Context, task *model.ExportTask, startID, endID uint64) ([][]string, error) {
-	if endID == 0 {
 		return [][]string{}, nil
 	}

 	var devices []model.Device
-	query := s.db.WithContext(ctx).
-		Model(&model.Device{}).
-		Where("id > ? AND id <= ?", startID, endID).
-		Order("id ASC")
-	query = applyShopScopeForTask(query, task)
-
+	query := s.applyFilters(s.db.WithContext(ctx).Model(&model.Device{}), params).
+		Order("id ASC").
+		Limit(limit).
+		Offset(offset)
 	if err := query.Find(&devices).Error; err != nil {
 		return nil, err
 	}

 	rows := make([][]string, 0, len(devices))
 	for _, item := range devices {
-		shopID := ""
-		if item.ShopID != nil {
-			shopID = strconv.FormatUint(uint64(*item.ShopID), 10)
-		}
-
 		rows = append(rows, []string{
 			strconv.FormatUint(uint64(item.ID), 10),
 			item.VirtualNo,
@@ -89,10 +64,27 @@ func (s *DeviceSceneStrategy) QueryRows(ctx context.Context, task *model.ExportT
 			item.DeviceModel,
 			item.DeviceType,
 			strconv.Itoa(item.Status),
-			shopID,
-			item.CreatedAt.Format("2006-01-02 15:04:05"),
+			formatOptionalUint(item.ShopID),
+			item.CreatedAt.Format(exportTimeLayout),
 		})
 	}
-
 	return rows, nil
 }
+
+func (s *DeviceDataSource) applyFilters(query *gorm.DB, params ExportParams) *gorm.DB {
+	query = applyExportShopScope(query, params, "shop_id")
+
+	if status, ok := filterInt(params.Filters, "status"); ok {
+		query = query.Where("status = ?", status)
+	}
+	if shopID, ok := filterUint(params.Filters, "shop_id"); ok {
+		query = query.Where("shop_id = ?", shopID)
+	}
+	if start, ok := filterTime(params.Filters, "created_at_start"); ok {
+		query = query.Where("created_at >= ?", start)
+	}
+	if end, ok := filterTime(params.Filters, "created_at_end"); ok {
+		query = query.Where("created_at <= ?", end)
+	}
+	return query
+}
--- a/internal/exporter/filter_helpers.go
+++ b/internal/exporter/filter_helpers.go
@@ -0,0 +1,270 @@
+package exporter
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"gorm.io/gorm"
+
+	"github.com/break/junhong_cmp_fiber/pkg/constants"
+)
+
+const exportTimeLayout = "2006-01-02 15:04:05"
+
+func applyExportShopScope(query *gorm.DB, params ExportParams, column string) *gorm.DB {
+	switch params.UserType {
+	case constants.UserTypeSuperAdmin, constants.UserTypePlatform:
+		return query
+	case constants.UserTypeAgent:
+		if len(params.ScopeShopIDs) == 0 {
+			return query.Where("1 = 0")
+		}
+		return query.Where(column+" IN ?", params.ScopeShopIDs)
+	default:
+		return query.Where("1 = 0")
+	}
+}
+
+func filterInt(filters map[string]any, key string) (int, bool) {
+	value, ok := filters[key]
+	if !ok || value == nil {
+		return 0, false
+	}
+
+	switch v := value.(type) {
+	case int:
+		return v, true
+	case int64:
+		return int(v), true
+	case uint:
+		return int(v), true
+	case uint64:
+		return int(v), true
+	case float64:
+		return int(v), true
+	case string:
+		if strings.TrimSpace(v) == "" {
+			return 0, false
+		}
+		parsed, err := strconv.Atoi(v)
+		if err != nil {
+			return 0, false
+		}
+		return parsed, true
+	default:
+		return 0, false
+	}
+}
+
+func filterUint(filters map[string]any, key string) (uint, bool) {
+	value, ok := filterInt(filters, key)
+	if !ok || value <= 0 {
+		return 0, false
+	}
+	return uint(value), true
+}
+
+func filterString(filters map[string]any, key string) (string, bool) {
+	value, ok := filters[key]
+	if !ok || value == nil {
+		return "", false
+	}
+	text := strings.TrimSpace(fmt.Sprint(value))
+	if text == "" {
+		return "", false
+	}
+	return text, true
+}
+
+func filterBool(filters map[string]any, key string) bool {
+	value, ok := filters[key]
+	if !ok || value == nil {
+		return false
+	}
+
+	switch v := value.(type) {
+	case bool:
+		return v
+	case string:
+		parsed, err := strconv.ParseBool(strings.TrimSpace(v))
+		return err == nil && parsed
+	default:
+		return false
+	}
+}
+
+// filterOptionalBool 解析可选布尔筛选项。
+// 返回第二个值标识调用方是否明确传入该筛选项，避免 false 被误判为未传。
+func filterOptionalBool(filters map[string]any, key string) (bool, bool) {
+	value, ok := filters[key]
+	if !ok || value == nil {
+		return false, false
+	}
+
+	switch v := value.(type) {
+	case bool:
+		return v, true
+	case string:
+		if strings.TrimSpace(v) == "" {
+			return false, false
+		}
+		parsed, err := strconv.ParseBool(strings.TrimSpace(v))
+		if err != nil {
+			return false, false
+		}
+		return parsed, true
+	case int:
+		return v != 0, true
+	case int64:
+		return v != 0, true
+	case uint:
+		return v != 0, true
+	case uint64:
+		return v != 0, true
+	case float64:
+		return v != 0, true
+	default:
+		return false, false
+	}
+}
+
+// filterUintSlice 解析前端 JSON 或查询参数中的 uint 数组筛选项。
+// 空数组按未传处理；数组存在但过滤后为空时由调用方决定是否返回空结果。
+func filterUintSlice(filters map[string]any, key string) ([]uint, bool) {
+	value, ok := filters[key]
+	if !ok || value == nil {
+		return nil, false
+	}
+
+	switch v := value.(type) {
+	case []uint:
+		if len(v) == 0 {
+			return nil, false
+		}
+		return normalizeUintSlice(v), true
+	case []int:
+		if len(v) == 0 {
+			return nil, false
+		}
+		result := make([]uint, 0, len(v))
+		for _, item := range v {
+			if item > 0 {
+				result = append(result, uint(item))
+			}
+		}
+		return normalizeUintSlice(result), true
+	case []float64:
+		if len(v) == 0 {
+			return nil, false
+		}
+		result := make([]uint, 0, len(v))
+		for _, item := range v {
+			if item > 0 {
+				result = append(result, uint(item))
+			}
+		}
+		return normalizeUintSlice(result), true
+	case []any:
+		if len(v) == 0 {
+			return nil, false
+		}
+		result := make([]uint, 0, len(v))
+		for _, item := range v {
+			switch typed := item.(type) {
+			case int:
+				if typed > 0 {
+					result = append(result, uint(typed))
+				}
+			case int64:
+				if typed > 0 {
+					result = append(result, uint(typed))
+				}
+			case uint:
+				if typed > 0 {
+					result = append(result, typed)
+				}
+			case uint64:
+				if typed > 0 {
+					result = append(result, uint(typed))
+				}
+			case float64:
+				if typed > 0 {
+					result = append(result, uint(typed))
+				}
+			case string:
+				if parsed, err := strconv.ParseUint(strings.TrimSpace(typed), 10, 64); err == nil && parsed > 0 {
+					result = append(result, uint(parsed))
+				}
+			}
+		}
+		return normalizeUintSlice(result), true
+	case string:
+		if strings.TrimSpace(v) == "" {
+			return nil, false
+		}
+		parts := strings.Split(v, ",")
+		result := make([]uint, 0, len(parts))
+		for _, part := range parts {
+			parsed, err := strconv.ParseUint(strings.TrimSpace(part), 10, 64)
+			if err == nil && parsed > 0 {
+				result = append(result, uint(parsed))
+			}
+		}
+		return normalizeUintSlice(result), true
+	default:
+		return nil, false
+	}
+}
+
+// normalizeUintSlice 去除无效值和重复 ID，保留原始顺序。
+func normalizeUintSlice(values []uint) []uint {
+	seen := make(map[uint]struct{}, len(values))
+	result := make([]uint, 0, len(values))
+	for _, value := range values {
+		if value == 0 {
+			continue
+		}
+		if _, ok := seen[value]; ok {
+			continue
+		}
+		seen[value] = struct{}{}
+		result = append(result, value)
+	}
+	return result
+}
+
+func filterTime(filters map[string]any, key string) (time.Time, bool) {
+	text, ok := filterString(filters, key)
+	if !ok {
+		return time.Time{}, false
+	}
+
+	layouts := []string{
+		time.RFC3339,
+		"2006-01-02 15:04:05",
+		"2006-01-02",
+	}
+	for _, layout := range layouts {
+		parsed, err := time.ParseInLocation(layout, text, time.Local)
+		if err == nil {
+			return parsed, true
+		}
+	}
+	return time.Time{}, false
+}
+
+func formatOptionalUint(value *uint) string {
+	if value == nil {
+		return ""
+	}
+	return strconv.FormatUint(uint64(*value), 10)
+}
+
+func formatOptionalTime(value *time.Time) string {
+	if value == nil {
+		return ""
+	}
+	return value.Format(exportTimeLayout)
+}
--- a/internal/exporter/iot_card_scene.go
+++ b/internal/exporter/iot_card_scene.go
@@ -2,97 +2,219 @@ package exporter

 import (
 	"context"
-	"strconv"
+	"time"

 	"gorm.io/gorm"

-	"github.com/break/junhong_cmp_fiber/internal/model"
 	"github.com/break/junhong_cmp_fiber/pkg/constants"
 )

-// IotCardSceneStrategy IoT 卡导出场景策略。
-type IotCardSceneStrategy struct {
+// IotCardDataSource IoT 卡导出数据源。
+type IotCardDataSource struct {
 	db *gorm.DB
 }

-// NewIotCardSceneStrategy 创建 IoT 卡场景策略。
-func NewIotCardSceneStrategy(db *gorm.DB) *IotCardSceneStrategy {
-	return &IotCardSceneStrategy{db: db}
+// NewIotCardDataSource 创建 IoT 卡导出数据源。
+func NewIotCardDataSource(db *gorm.DB) *IotCardDataSource {
+	return &IotCardDataSource{db: db}
 }

-// Scene 场景编码。
-func (s *IotCardSceneStrategy) Scene() string {
+// Scene 返回导出场景编码。
+func (s *IotCardDataSource) Scene() string {
 	return constants.ExportTaskSceneIotCard
 }

-// Headers 导出表头。
-func (s *IotCardSceneStrategy) Headers() []string {
-	return []string{"ID", "ICCID", "MSISDN", "虚拟号", "运营商名称", "状态", "店铺ID", "创建时间"}
+// Count 统计 IoT 卡导出行数。
+func (s *IotCardDataSource) Count(ctx context.Context, params ExportParams) (int, error) {
+	var total int64
+	query := s.applyFilters(ctx, s.baseQuery(ctx), params)
+	if err := query.Count(&total).Error; err != nil {
+		return 0, err
+	}
+	return int(total), nil
 }

-// NextShardBoundary 获取下一段分片边界。
-func (s *IotCardSceneStrategy) NextShardBoundary(ctx context.Context, task *model.ExportTask, afterID uint64, limit int) (*ShardBoundary, error) {
+// Headers 返回 IoT 卡导出表头。
+func (s *IotCardDataSource) Headers(ctx context.Context, params ExportParams) ([]string, error) {
+	return []string{"ICCID", "MSISDN", "绑定设备虚拟号", "运营商", "店铺名称", "绑定设备名称", "是否实名", "实名时间", "网络状态"}, nil
+}
+
+// Fetch 按 offset/limit 查询 IoT 卡导出数据。
+func (s *IotCardDataSource) Fetch(ctx context.Context, params ExportParams, offset, limit int) ([][]string, error) {
 	if limit <= 0 {
-		limit = constants.ExportDefaultShardSize
-	}
-
-	var ids []uint64
-	query := s.db.WithContext(ctx).
-		Model(&model.IotCard{}).
-		Where("id > ?", afterID).
-		Order("id ASC").
-		Limit(limit)
-	query = applyShopScopeForTask(query, task)
-
-	if err := query.Pluck("id", &ids).Error; err != nil {
-		return nil, err
-	}
-	if len(ids) == 0 {
-		return nil, nil
-	}
-
-	return &ShardBoundary{
-		StartID:  afterID,
-		EndID:    ids[len(ids)-1],
-		RowCount: len(ids),
-	}, nil
-}
-
-// QueryRows 查询分片内数据行。
-func (s *IotCardSceneStrategy) QueryRows(ctx context.Context, task *model.ExportTask, startID, endID uint64) ([][]string, error) {
-	if endID == 0 {
 		return [][]string{}, nil
 	}

-	var cards []model.IotCard
-	query := s.db.WithContext(ctx).
-		Model(&model.IotCard{}).
-		Where("id > ? AND id <= ?", startID, endID).
-		Order("id ASC")
-	query = applyShopScopeForTask(query, task)
-
-	if err := query.Find(&cards).Error; err != nil {
+	var items []iotCardExportRow
+	query := s.applyFilters(ctx, s.baseQuery(ctx), params).
+		Select(`
+			c.iccid,
+			c.msisdn,
+			c.device_virtual_no,
+			c.carrier_name,
+			COALESCE(sh.shop_name, '') AS shop_name,
+			COALESCE(d.device_name, '') AS device_name,
+			c.real_name_status,
+			c.first_realname_at,
+			c.network_status
+		`).
+		Order("c.id ASC").
+		Limit(limit).
+		Offset(offset)
+	if err := query.Scan(&items).Error; err != nil {
 		return nil, err
 	}

-	rows := make([][]string, 0, len(cards))
-	for _, item := range cards {
-		shopID := ""
-		if item.ShopID != nil {
-			shopID = strconv.FormatUint(uint64(*item.ShopID), 10)
-		}
-
+	rows := make([][]string, 0, len(items))
+	for _, item := range items {
 		rows = append(rows, []string{
-			strconv.FormatUint(uint64(item.ID), 10),
 			item.ICCID,
 			item.MSISDN,
-			item.VirtualNo,
+			item.DeviceVirtualNo,
 			item.CarrierName,
-			strconv.Itoa(item.Status),
-			shopID,
-			item.CreatedAt.Format("2006-01-02 15:04:05"),
+			item.ShopName,
+			item.DeviceName,
+			formatRealNameVerified(item.RealNameStatus),
+			formatOptionalTime(item.FirstRealnameAt),
+			constants.GetNetworkStatusName(item.NetworkStatus),
 		})
 	}
-
 	return rows, nil
 }
+
+// baseQuery 构造卡导出的基础查询。
+// 绑定设备名称从当前有效绑定中取一条，避免多绑定历史记录放大导出行数。
+func (s *IotCardDataSource) baseQuery(ctx context.Context) *gorm.DB {
+	return s.db.WithContext(ctx).
+		Table("tb_iot_card AS c").
+		Joins("LEFT JOIN tb_shop AS sh ON sh.id = c.shop_id").
+		Joins(`
+			LEFT JOIN LATERAL (
+				SELECT d.device_name
+				FROM tb_device_sim_binding AS b
+				JOIN tb_device AS d ON d.id = b.device_id AND d.deleted_at IS NULL
+				WHERE b.iot_card_id = c.id
+					AND b.bind_status = ?
+					AND b.deleted_at IS NULL
+				ORDER BY b.is_current DESC, b.id DESC
+				LIMIT 1
+			) AS d ON TRUE
+		`, constants.BindStatusBound).
+		Where("c.deleted_at IS NULL")
+}
+
+// applyFilters 应用与 /api/admin/iot-cards/standalone 一致的筛选条件。
+// 导出任务运行在 Worker 中，权限只能使用任务创建时保存的店铺范围快照。
+func (s *IotCardDataSource) applyFilters(ctx context.Context, query *gorm.DB, params ExportParams) *gorm.DB {
+	query = applyExportShopScope(query, params, "c.shop_id")
+
+	if isStandalone, ok := filterOptionalBool(params.Filters, "is_standalone"); ok {
+		query = query.Where("c.is_standalone = ?", isStandalone)
+	}
+	if status, ok := filterInt(params.Filters, "status"); ok && status > 0 {
+		query = query.Where("c.status = ?", status)
+	}
+	if carrierID, ok := filterUint(params.Filters, "carrier_id"); ok {
+		query = query.Where("c.carrier_id = ?", carrierID)
+	}
+	if shopIDs, ok := filterUintSlice(params.Filters, "shop_ids"); ok {
+		if len(shopIDs) == 0 {
+			query = query.Where("1 = 0")
+		} else {
+			query = query.Where("c.shop_id IN ?", shopIDs)
+		}
+	} else if shopID, ok := filterInt(params.Filters, "shop_id"); ok {
+		if shopID <= 0 {
+			query = query.Where("1 = 0")
+		} else {
+			query = query.Where("c.shop_id = ?", shopID)
+		}
+	}
+	if iccid, ok := filterString(params.Filters, "iccid"); ok {
+		query = query.Where("c.iccid LIKE ?", "%"+iccid+"%")
+	}
+	if msisdn, ok := filterString(params.Filters, "msisdn"); ok {
+		query = query.Where("c.msisdn LIKE ?", "%"+msisdn+"%")
+	}
+	if virtualNo, ok := filterString(params.Filters, "virtual_no"); ok {
+		query = query.Where("c.virtual_no LIKE ?", "%"+virtualNo+"%")
+	}
+	if keyword, ok := filterString(params.Filters, "keyword"); ok {
+		query = query.Where("c.iccid LIKE ? OR c.virtual_no LIKE ?", "%"+keyword+"%", "%"+keyword+"%")
+	}
+	if batchNo, ok := filterString(params.Filters, "batch_no"); ok {
+		query = query.Where("c.batch_no = ?", batchNo)
+	}
+	if packageID, ok := filterUint(params.Filters, "package_id"); ok {
+		query = query.Where("c.id IN (?)",
+			s.db.WithContext(ctx).Table("tb_package_usage").
+				Select("iot_card_id").
+				Where("package_id = ? AND deleted_at IS NULL", packageID))
+	}
+	if isDistributed, ok := filterOptionalBool(params.Filters, "is_distributed"); ok {
+		if isDistributed {
+			query = query.Where("c.shop_id IS NOT NULL")
+		} else {
+			query = query.Where("c.shop_id IS NULL")
+		}
+	}
+	if iccidStart, ok := filterString(params.Filters, "iccid_start"); ok {
+		query = query.Where("c.iccid >= ?", iccidStart)
+	}
+	if iccidEnd, ok := filterString(params.Filters, "iccid_end"); ok {
+		query = query.Where("c.iccid <= ?", iccidEnd)
+	}
+	if isReplaced, ok := filterOptionalBool(params.Filters, "is_replaced"); ok {
+		subQuery := s.db.WithContext(ctx).Table("tb_exchange_order").
+			Select("old_asset_id").
+			Where("old_asset_type = ? AND status IN ? AND deleted_at IS NULL",
+				constants.ExchangeAssetTypeIotCard,
+				[]int{constants.ExchangeStatusShipped, constants.ExchangeStatusCompleted},
+			)
+		if isReplaced {
+			query = query.Where("c.id IN (?)", subQuery)
+		} else {
+			query = query.Where("c.id NOT IN (?)", subQuery)
+		}
+	}
+	if seriesID, ok := filterUint(params.Filters, "series_id"); ok {
+		query = query.Where("c.series_id = ?", seriesID)
+	}
+	if carrierName, ok := filterString(params.Filters, "carrier_name"); ok {
+		query = query.Where("c.carrier_name LIKE ?", "%"+carrierName+"%")
+	}
+	if hasActivePackage, ok := filterOptionalBool(params.Filters, "has_active_package"); ok {
+		subQuery := s.db.WithContext(ctx).Table("tb_package_usage AS pu").
+			Select("1").
+			Where("pu.iot_card_id = c.id AND pu.status = ? AND pu.master_usage_id IS NULL AND pu.deleted_at IS NULL", constants.PackageUsageStatusActive)
+		if hasActivePackage {
+			query = query.Where("EXISTS (?)", subQuery)
+		} else {
+			query = query.Where("NOT EXISTS (?)", subQuery)
+		}
+	}
+	return query
+}
+
+type iotCardExportRow struct {
+	ICCID           string
+	MSISDN          string
+	DeviceVirtualNo string
+	CarrierName     string
+	ShopName        string
+	DeviceName      string
+	RealNameStatus  int
+	FirstRealnameAt *time.Time
+	NetworkStatus   int
+}
+
+func formatRealNameVerified(status int) string {
+	switch status {
+	case constants.RealNameStatusVerified:
+		return "是"
+	case constants.RealNameStatusNotVerified:
+		return "否"
+	default:
+		return "未知"
+	}
+}
--- a/internal/exporter/query_params.go
+++ b/internal/exporter/query_params.go
@@ -0,0 +1,56 @@
+package exporter
+
+import (
+	"github.com/bytedance/sonic"
+
+	"github.com/break/junhong_cmp_fiber/internal/model"
+)
+
+// ParseExportParams 从导出任务快照解析数据源执行参数。
+func ParseExportParams(task *model.ExportTask) ExportParams {
+	params := ExportParams{Filters: make(map[string]any)}
+	if task == nil {
+		return params
+	}
+
+	params.ScopeShopIDs = append(params.ScopeShopIDs, task.ScopeShopIDs...)
+	params.UserType = task.CreatorUserType
+
+	var raw map[string]any
+	if len(task.QueryJSON) == 0 {
+		return params
+	}
+	if err := sonic.Unmarshal(task.QueryJSON, &raw); err != nil {
+		return params
+	}
+
+	if filters, ok := raw["filters"].(map[string]any); ok {
+		params.Filters = filters
+	}
+	return params
+}
+
+// ResolvedHeadersFromTask 从任务 query_json 读取 dispatch 阶段固定的表头。
+func ResolvedHeadersFromTask(task *model.ExportTask) []string {
+	if task == nil || len(task.QueryJSON) == 0 {
+		return nil
+	}
+
+	var raw map[string]any
+	if err := sonic.Unmarshal(task.QueryJSON, &raw); err != nil {
+		return nil
+	}
+
+	values, ok := raw["resolved_headers"].([]any)
+	if !ok {
+		return nil
+	}
+
+	headers := make([]string, 0, len(values))
+	for _, value := range values {
+		if text, ok := value.(string); ok {
+			headers = append(headers, text)
+		}
+	}
+	return headers
+}
--- a/internal/exporter/registry.go
+++ b/internal/exporter/registry.go
@@ -1,71 +1,54 @@
 package exporter

 import (
-	"context"
 	"sort"

 	"gorm.io/gorm"

-	"github.com/break/junhong_cmp_fiber/internal/model"
 	"github.com/break/junhong_cmp_fiber/pkg/constants"
 )

-// ShardBoundary 分片边界信息。
-type ShardBoundary struct {
-	StartID  uint64
-	EndID    uint64
-	RowCount int
-}
-
-// SceneStrategy 导出场景策略接口。
-type SceneStrategy interface {
-	Scene() string
-	Headers() []string
-	NextShardBoundary(ctx context.Context, task *model.ExportTask, afterID uint64, limit int) (*ShardBoundary, error)
-	QueryRows(ctx context.Context, task *model.ExportTask, startID, endID uint64) ([][]string, error)
-}
-
-// Registry 场景策略注册中心。
+// Registry 导出数据源注册中心。
 type Registry struct {
-	strategies map[string]SceneStrategy
+	sources map[string]DataSource
 }

-// NewRegistry 创建场景策略注册中心。
-func NewRegistry(strategies ...SceneStrategy) *Registry {
-	m := make(map[string]SceneStrategy, len(strategies))
-	for _, strategy := range strategies {
-		if strategy == nil {
+// NewRegistry 创建导出数据源注册中心。
+func NewRegistry(sources ...DataSource) *Registry {
+	m := make(map[string]DataSource, len(sources))
+	for _, source := range sources {
+		if source == nil {
 			continue
 		}
-		m[strategy.Scene()] = strategy
+		m[source.Scene()] = source
 	}
-	return &Registry{strategies: m}
+	return &Registry{sources: m}
 }

-// NewDefaultRegistry 创建默认场景策略注册中心。
+// NewDefaultRegistry 创建默认导出数据源注册中心。
 func NewDefaultRegistry(db *gorm.DB) *Registry {
 	return NewRegistry(
-		NewDeviceSceneStrategy(db),
-		NewIotCardSceneStrategy(db),
+		NewDeviceDataSource(db),
+		NewIotCardDataSource(db),
 	)
 }

-// Get 获取指定场景策略。
-func (r *Registry) Get(scene string) (SceneStrategy, bool) {
-	strategy, ok := r.strategies[scene]
-	return strategy, ok
+// Get 获取指定场景数据源。
+func (r *Registry) Get(scene string) (DataSource, bool) {
+	source, ok := r.sources[scene]
+	return source, ok
 }

 // IsSupported 判断场景是否支持。
 func (r *Registry) IsSupported(scene string) bool {
-	_, ok := r.strategies[scene]
+	_, ok := r.sources[scene]
 	return ok
 }

 // Scenes 返回当前支持的场景列表。
 func (r *Registry) Scenes() []string {
-	result := make([]string, 0, len(r.strategies))
-	for scene := range r.strategies {
+	result := make([]string, 0, len(r.sources))
+	for scene := range r.sources {
 		result = append(result, scene)
 	}
 	sort.Strings(result)
--- a/internal/exporter/scope.go
+++ b/internal/exporter/scope.go
@@ -1,26 +1 @@
 package exporter
-
-import (
-	"gorm.io/gorm"
-
-	"github.com/break/junhong_cmp_fiber/internal/model"
-	"github.com/break/junhong_cmp_fiber/pkg/constants"
-)
-
-func applyShopScopeForTask(query *gorm.DB, task *model.ExportTask) *gorm.DB {
-	if task == nil {
-		return query.Where("1 = 0")
-	}
-
-	switch task.CreatorUserType {
-	case constants.UserTypeSuperAdmin, constants.UserTypePlatform:
-		return query
-	case constants.UserTypeAgent:
-		if len(task.ScopeShopIDs) == 0 {
-			return query.Where("1 = 0")
-		}
-		return query.Where("shop_id IN ?", []uint(task.ScopeShopIDs))
-	default:
-		return query.Where("1 = 0")
-	}
-}
--- a/internal/model/export_task.go
+++ b/internal/model/export_task.go
@@ -85,11 +85,11 @@ type ExportShardTask struct {
 	gorm.Model
 	BaseModel `gorm:"embedded"`

-	TaskID      uint   `gorm:"column:task_id;type:bigint;index:idx_export_shard_task_task_status,priority:1;not null;comment:主任务ID" json:"task_id"`
-	ShardNo     int    `gorm:"column:shard_no;type:int;not null;comment:分片序号(从1开始)" json:"shard_no"`
-	Status      int    `gorm:"column:status;type:int;index:idx_export_shard_task_task_status,priority:2;not null;default:1;comment:分片状态 1-待处理 2-处理中 3-已成功 4-已失败 5-已取消" json:"status"`
-	CursorStart uint64 `gorm:"column:cursor_start;type:bigint;not null;default:0;comment:分片游标起点(不含)" json:"cursor_start"`
-	CursorEnd   uint64 `gorm:"column:cursor_end;type:bigint;not null;default:0;comment:分片游标终点(含)" json:"cursor_end"`
+	TaskID      uint `gorm:"column:task_id;type:bigint;index:idx_export_shard_task_task_status,priority:1;not null;comment:主任务ID" json:"task_id"`
+	ShardNo     int  `gorm:"column:shard_no;type:int;not null;comment:分片序号(从1开始)" json:"shard_no"`
+	Status      int  `gorm:"column:status;type:int;index:idx_export_shard_task_task_status,priority:2;not null;default:1;comment:分片状态 1-待处理 2-处理中 3-已成功 4-已失败 5-已取消" json:"status"`
+	ShardOffset int  `gorm:"column:shard_offset;type:bigint;not null;default:0;comment:分片偏移量(offset)" json:"shard_offset"`
+	ShardLimit  int  `gorm:"column:shard_limit;type:int;not null;default:0;comment:分片行数上限(limit)" json:"shard_limit"`

 	RowCount      int        `gorm:"column:row_count;type:int;not null;default:0;comment:分片行数" json:"row_count"`
 	ProcessedRows int        `gorm:"column:processed_rows;type:int;not null;default:0;comment:分片已处理行数" json:"processed_rows"`
--- a/internal/store/postgres/export_task_store.go
+++ b/internal/store/postgres/export_task_store.go
@@ -5,7 +5,9 @@ import (
 	"fmt"
 	"time"

+	"github.com/bytedance/sonic"
 	"github.com/redis/go-redis/v9"
+	"gorm.io/datatypes"
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"

@@ -124,7 +126,7 @@ func (s *ExportTaskStore) TryMarkProcessingIfPending(ctx context.Context, taskID
 }

 // UpdateDispatchPlan 更新 dispatch 阶段计算出的总量信息。
-func (s *ExportTaskStore) UpdateDispatchPlan(ctx context.Context, taskID uint, totalRows, totalShards uint, updater uint) error {
+func (s *ExportTaskStore) UpdateDispatchPlan(ctx context.Context, taskID uint, totalRows, totalShards int, updater uint) error {
 	now := time.Now()
 	return s.db.WithContext(ctx).
 		Model(&model.ExportTask{}).
@@ -138,6 +140,40 @@ func (s *ExportTaskStore) UpdateDispatchPlan(ctx context.Context, taskID uint, t
 		}).Error
 }

+// UpdateResolvedHeaders 固定导出任务运行期表头。
+func (s *ExportTaskStore) UpdateResolvedHeaders(ctx context.Context, taskID uint, headers []string, updater uint) error {
+	var task model.ExportTask
+	if err := s.db.WithContext(ctx).
+		Select("id", "query_json").
+		Where("id = ?", taskID).
+		First(&task).Error; err != nil {
+		return err
+	}
+
+	raw := make(map[string]any)
+	if len(task.QueryJSON) > 0 {
+		if err := sonic.Unmarshal(task.QueryJSON, &raw); err != nil {
+			return err
+		}
+	}
+	raw["resolved_headers"] = headers
+
+	bytes, err := sonic.Marshal(raw)
+	if err != nil {
+		return err
+	}
+
+	now := time.Now()
+	return s.db.WithContext(ctx).
+		Model(&model.ExportTask{}).
+		Where("id = ?", taskID).
+		Updates(map[string]any{
+			"query_json": datatypes.JSON(bytes),
+			"updated_at": now,
+			"updater":    updater,
+		}).Error
+}
+
 // IsCancelRequested 查询是否已请求取消。
 func (s *ExportTaskStore) IsCancelRequested(ctx context.Context, taskID uint) (bool, error) {
 	var value bool
--- a/internal/task/export_common.go
+++ b/internal/task/export_common.go
@@ -5,6 +5,7 @@ import (
 	"encoding/csv"
 	"errors"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 	"time"
@@ -82,18 +83,18 @@ func isFinalRetry(ctx context.Context) bool {
 	return retryCount >= maxRetry
 }

-func writeExportFile(format string, headers []string, rows [][]string) (string, int64, error) {
+func writeExportFile(format string, headers []string, rows [][]string, withoutHeader bool) (string, int64, error) {
 	switch format {
 	case constants.ExportTaskFormatCSV:
-		return writeCSVFile(headers, rows)
+		return writeCSVFile(headers, rows, withoutHeader)
 	case constants.ExportTaskFormatXLSX:
-		return writeXLSXFile(headers, rows)
+		return writeXLSXFile(headers, rows, withoutHeader)
 	default:
 		return "", 0, fmt.Errorf("不支持的导出格式: %s", format)
 	}
 }

-func writeCSVFile(headers []string, rows [][]string) (string, int64, error) {
+func writeCSVFile(headers []string, rows [][]string, withoutHeader bool) (string, int64, error) {
 	file, err := os.CreateTemp("", "export-*.csv")
 	if err != nil {
 		return "", 0, err
@@ -101,8 +102,10 @@ func writeCSVFile(headers []string, rows [][]string) (string, int64, error) {
 	defer file.Close()

 	writer := csv.NewWriter(file)
-	if err := writer.Write(headers); err != nil {
-		return "", 0, err
+	if !withoutHeader {
+		if err := writer.Write(headers); err != nil {
+			return "", 0, err
+		}
 	}
 	for _, row := range rows {
 		if err := writer.Write(row); err != nil {
@@ -125,7 +128,7 @@ func writeCSVFile(headers []string, rows [][]string) (string, int64, error) {
 	return file.Name(), stat.Size(), nil
 }

-func writeXLSXFile(headers []string, rows [][]string) (string, int64, error) {
+func writeXLSXFile(headers []string, rows [][]string, withoutHeader bool) (string, int64, error) {
 	file := excelize.NewFile()
 	sheet := file.GetSheetName(file.GetActiveSheetIndex())

@@ -134,16 +137,20 @@ func writeXLSXFile(headers []string, rows [][]string) (string, int64, error) {
 		return "", 0, err
 	}

-	headerValues := make([]interface{}, 0, len(headers))
-	for _, item := range headers {
-		headerValues = append(headerValues, item)
-	}
-	if err := streamWriter.SetRow("A1", headerValues); err != nil {
-		return "", 0, err
+	rowIndex := 1
+	if !withoutHeader {
+		headerValues := make([]interface{}, 0, len(headers))
+		for _, item := range headers {
+			headerValues = append(headerValues, item)
+		}
+		if err := streamWriter.SetRow("A1", headerValues); err != nil {
+			return "", 0, err
+		}
+		rowIndex++
 	}

-	for i, row := range rows {
-		axis, err := excelize.CoordinatesToCellName(1, i+2)
+	for _, row := range rows {
+		axis, err := excelize.CoordinatesToCellName(1, rowIndex)
 		if err != nil {
 			return "", 0, err
 		}
@@ -154,6 +161,7 @@ func writeXLSXFile(headers []string, rows [][]string) (string, int64, error) {
 		if err := streamWriter.SetRow(axis, values); err != nil {
 			return "", 0, err
 		}
+		rowIndex++
 	}

 	if err := streamWriter.Flush(); err != nil {
@@ -175,6 +183,90 @@ func writeXLSXFile(headers []string, rows [][]string) (string, int64, error) {
 	return path, stat.Size(), nil
 }

+func writeXLSXFromCSV(csvPath string) (string, int64, error) {
+	source, err := os.Open(csvPath)
+	if err != nil {
+		return "", 0, err
+	}
+	defer source.Close()
+
+	file := excelize.NewFile()
+	sheet := file.GetSheetName(file.GetActiveSheetIndex())
+	streamWriter, err := file.NewStreamWriter(sheet)
+	if err != nil {
+		return "", 0, err
+	}
+
+	reader := csv.NewReader(source)
+	rowIndex := 1
+	for {
+		row, err := reader.Read()
+		if errors.Is(err, io.EOF) {
+			break
+		}
+		if err != nil {
+			return "", 0, err
+		}
+
+		values := make([]interface{}, 0, len(row))
+		for _, item := range row {
+			values = append(values, item)
+		}
+		axis, err := excelize.CoordinatesToCellName(1, rowIndex)
+		if err != nil {
+			return "", 0, err
+		}
+		if err := streamWriter.SetRow(axis, values); err != nil {
+			return "", 0, err
+		}
+		rowIndex++
+	}
+
+	if err := streamWriter.Flush(); err != nil {
+		return "", 0, err
+	}
+
+	path := filepath.Join(os.TempDir(), fmt.Sprintf("export-%d.xlsx", time.Now().UnixNano()))
+	if err := file.SaveAs(path); err != nil {
+		return "", 0, err
+	}
+	if err := file.Close(); err != nil {
+		return "", 0, err
+	}
+
+	stat, err := os.Stat(path)
+	if err != nil {
+		return "", 0, err
+	}
+	return path, stat.Size(), nil
+}
+
+func alignRowsToHeaders(rows [][]string, headers []string) [][]string {
+	if len(headers) == 0 {
+		return rows
+	}
+
+	aligned := make([][]string, 0, len(rows))
+	for _, row := range rows {
+		current := make([]string, len(headers))
+		copy(current, row)
+		aligned = append(aligned, current)
+	}
+	return aligned
+}
+
+func hasMisalignedRows(rows [][]string, headers []string) bool {
+	if len(headers) == 0 {
+		return false
+	}
+	for _, row := range rows {
+		if len(row) != len(headers) {
+			return true
+		}
+	}
+	return false
+}
+
 func uploadExportFile(ctx context.Context, storageSvc *storage.Service, localPath, fileName string) (string, error) {
 	if storageSvc == nil || storageSvc.Provider() == nil {
 		return "", errors.New("对象存储服务未配置")
--- a/internal/task/export_dispatch.go
+++ b/internal/task/export_dispatch.go
@@ -119,14 +119,22 @@ func (h *ExportDispatchHandler) HandleExportDispatch(ctx context.Context, task *
 		return asynq.SkipRetry
 	}

-	shards, totalRows, err := h.buildShards(ctx, exportTask, strategy, updater)
+	params := exporter.ParseExportParams(exportTask)
+	headers, err := strategy.Headers(ctx, params)
+	if err != nil {
+		_ = h.taskStore.MarkFailed(ctx, exportTask.ID, updater, "解析导出表头失败")
+		h.logger.Error("解析导出表头失败", zap.Uint("task_id", exportTask.ID), zap.Error(err))
+		return err
+	}
+
+	shards, totalRows, err := h.buildShards(ctx, strategy, params, exportTask.CancelRequested, exportTask.ID, updater)
 	if err != nil {
 		_ = h.taskStore.MarkFailed(ctx, exportTask.ID, updater, "构建导出分片失败")
 		h.logger.Error("构建导出分片失败", zap.Uint("task_id", exportTask.ID), zap.Error(err))
 		return err
 	}

-	if err := h.persistShardsAndPlan(ctx, exportTask.ID, updater, shards, totalRows); err != nil {
+	if err := h.persistShardsAndPlan(ctx, exportTask.ID, updater, shards, totalRows, headers); err != nil {
 		_ = h.taskStore.MarkFailed(ctx, exportTask.ID, updater, "保存导出分片失败")
 		return err
 	}
@@ -141,58 +149,53 @@ func (h *ExportDispatchHandler) HandleExportDispatch(ctx context.Context, task *

 	h.logger.Info("导出 dispatch 完成",
 		zap.Uint("task_id", exportTask.ID),
-		zap.Uint("total_rows", totalRows),
+		zap.Int("total_rows", totalRows),
 		zap.Int("total_shards", len(shards)),
 	)

 	return nil
 }

-func (h *ExportDispatchHandler) buildShards(ctx context.Context, task *model.ExportTask, strategy exporter.SceneStrategy, updater uint) ([]*model.ExportShardTask, uint, error) {
+func (h *ExportDispatchHandler) buildShards(ctx context.Context, source exporter.DataSource, params exporter.ExportParams, cancelRequested bool, taskID uint, updater uint) ([]*model.ExportShardTask, int, error) {
 	shards := make([]*model.ExportShardTask, 0)
-	totalRows := uint(0)
-	afterID := uint64(0)
+	if cancelRequested {
+		return shards, 0, nil
+	}
+
+	totalRows, err := source.Count(ctx, params)
+	if err != nil {
+		return nil, 0, err
+	}
+	if totalRows <= 0 {
+		return shards, 0, nil
+	}
+
 	shardNo := 1
-
-	for {
-		if task.CancelRequested {
-			break
+	for offset := 0; offset < totalRows; offset += constants.ExportDefaultShardSize {
+		limit := constants.ExportDefaultShardSize
+		if remaining := totalRows - offset; remaining < limit {
+			limit = remaining
 		}

-		boundary, err := strategy.NextShardBoundary(ctx, task, afterID, constants.ExportDefaultShardSize)
-		if err != nil {
-			return nil, 0, err
-		}
-		if boundary == nil {
-			break
-		}
-
-		rowCount := boundary.RowCount
-		if rowCount < 0 {
-			rowCount = 0
-		}
-
-		totalRows += uint(rowCount)
 		shard := &model.ExportShardTask{
-			TaskID:      task.ID,
+			TaskID:      taskID,
 			ShardNo:     shardNo,
 			Status:      constants.ExportShardStatusPending,
-			CursorStart: boundary.StartID,
-			CursorEnd:   boundary.EndID,
-			RowCount:    rowCount,
+			ShardOffset: offset,
+			ShardLimit:  limit,
+			RowCount:    limit,
 		}
 		shard.Creator = updater
 		shard.Updater = updater
 		shards = append(shards, shard)

-		afterID = boundary.EndID
 		shardNo++
 	}

 	return shards, totalRows, nil
 }

-func (h *ExportDispatchHandler) persistShardsAndPlan(ctx context.Context, taskID uint, updater uint, shards []*model.ExportShardTask, totalRows uint) error {
+func (h *ExportDispatchHandler) persistShardsAndPlan(ctx context.Context, taskID uint, updater uint, shards []*model.ExportShardTask, totalRows int, headers []string) error {
 	return h.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
 		txShardStore := postgres.NewExportShardTaskStore(tx, h.redis)
 		txTaskStore := postgres.NewExportTaskStore(tx, h.redis)
@@ -200,7 +203,10 @@ func (h *ExportDispatchHandler) persistShardsAndPlan(ctx context.Context, taskID
 		if err := txShardStore.CreateBatch(ctx, shards); err != nil {
 			return err
 		}
-		if err := txTaskStore.UpdateDispatchPlan(ctx, taskID, totalRows, uint(len(shards)), updater); err != nil {
+		if err := txTaskStore.UpdateResolvedHeaders(ctx, taskID, headers, updater); err != nil {
+			return err
+		}
+		if err := txTaskStore.UpdateDispatchPlan(ctx, taskID, totalRows, len(shards), updater); err != nil {
 			return err
 		}
 		return nil
--- a/internal/task/export_finalize.go
+++ b/internal/task/export_finalize.go
@@ -2,7 +2,10 @@ package task

 import (
 	"context"
+	"encoding/csv"
+	"errors"
 	"fmt"
+	"io"
 	"os"

 	"github.com/hibiken/asynq"
@@ -10,6 +13,7 @@ import (
 	"go.uber.org/zap"

 	"github.com/break/junhong_cmp_fiber/internal/exporter"
+	"github.com/break/junhong_cmp_fiber/internal/model"
 	"github.com/break/junhong_cmp_fiber/internal/store/postgres"
 	"github.com/break/junhong_cmp_fiber/pkg/constants"
 	"github.com/break/junhong_cmp_fiber/pkg/storage"
@@ -102,8 +106,7 @@ func (h *ExportFinalizeHandler) HandleExportFinalize(ctx context.Context, task *
 		return nil
 	}

-	strategy, ok := h.sceneRegistry.Get(exportTask.Scene)
-	if !ok {
+	if !h.sceneRegistry.IsSupported(exportTask.Scene) {
 		if err := h.taskStore.MarkFailed(ctx, exportTask.ID, updater, "导出场景未注册"); err != nil {
 			return err
 		}
@@ -115,23 +118,22 @@ func (h *ExportFinalizeHandler) HandleExportFinalize(ctx context.Context, task *
 		return err
 	}

-	rows := make([][]string, 0)
-	for _, shard := range shards {
-		if shard.Status != constants.ExportShardStatusSuccess {
-			continue
-		}
-		currentRows, err := strategy.QueryRows(ctx, exportTask, shard.CursorStart, shard.CursorEnd)
-		if err != nil {
-			return h.handleFinalizeError(ctx, exportTask.ID, updater, "读取分片数据失败", err)
-		}
-		rows = append(rows, currentRows...)
+	headers := exporter.ResolvedHeadersFromTask(exportTask)
+	if len(headers) == 0 {
+		return h.handleFinalizeError(ctx, exportTask.ID, updater, "读取导出表头失败", errors.New("resolved_headers 为空"))
 	}

-	localPath, fileSize, err := writeExportFile(exportTask.Format, strategy.Headers(), rows)
+	mergedCSVPath, cleanupCSV, err := h.mergeShardCSVFiles(ctx, headers, shards)
 	if err != nil {
 		return h.handleFinalizeError(ctx, exportTask.ID, updater, "生成汇总文件失败", err)
 	}
-	defer func() { _ = os.Remove(localPath) }()
+	defer cleanupCSV()
+
+	localPath, fileSize, cleanupFinal, err := prepareFinalExportFile(exportTask.Format, mergedCSVPath)
+	if err != nil {
+		return h.handleFinalizeError(ctx, exportTask.ID, updater, "生成汇总文件失败", err)
+	}
+	defer cleanupFinal()

 	fileName := fmt.Sprintf("%s.%s", exportTask.TaskNo, exportTask.Format)
 	fileKey, err := uploadExportFile(ctx, h.storageSvc, localPath, fileName)
@@ -146,6 +148,104 @@ func (h *ExportFinalizeHandler) HandleExportFinalize(ctx context.Context, task *
 	return nil
 }

+func (h *ExportFinalizeHandler) mergeShardCSVFiles(ctx context.Context, headers []string, shards []*model.ExportShardTask) (string, func(), error) {
+	if h.storageSvc == nil || h.storageSvc.Provider() == nil {
+		return "", nil, errors.New("对象存储服务未配置")
+	}
+
+	file, err := os.CreateTemp("", "export-merged-*.csv")
+	if err != nil {
+		return "", nil, err
+	}
+
+	cleanup := func() {
+		_ = os.Remove(file.Name())
+	}
+
+	writer := csv.NewWriter(file)
+	if err := writer.Write(headers); err != nil {
+		file.Close()
+		cleanup()
+		return "", nil, err
+	}
+
+	for _, shard := range shards {
+		if shard.Status != constants.ExportShardStatusSuccess {
+			continue
+		}
+		if shard.FileKey == "" {
+			file.Close()
+			cleanup()
+			return "", nil, fmt.Errorf("分片 %d 缺少文件Key", shard.ShardNo)
+		}
+		if err := h.appendShardFile(ctx, writer, shard.FileKey); err != nil {
+			file.Close()
+			cleanup()
+			return "", nil, err
+		}
+	}
+
+	writer.Flush()
+	if err := writer.Error(); err != nil {
+		file.Close()
+		cleanup()
+		return "", nil, err
+	}
+	if err := file.Sync(); err != nil {
+		file.Close()
+		cleanup()
+		return "", nil, err
+	}
+	if err := file.Close(); err != nil {
+		cleanup()
+		return "", nil, err
+	}
+
+	return file.Name(), cleanup, nil
+}
+
+func (h *ExportFinalizeHandler) appendShardFile(ctx context.Context, writer *csv.Writer, key string) error {
+	reader, err := h.storageSvc.Provider().Download(ctx, key)
+	if err != nil {
+		return err
+	}
+	defer reader.Close()
+
+	csvReader := csv.NewReader(reader)
+	for {
+		row, err := csvReader.Read()
+		if errors.Is(err, io.EOF) {
+			break
+		}
+		if err != nil {
+			return err
+		}
+		if err := writer.Write(row); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func prepareFinalExportFile(format, mergedCSVPath string) (string, int64, func(), error) {
+	switch format {
+	case constants.ExportTaskFormatCSV:
+		stat, err := os.Stat(mergedCSVPath)
+		if err != nil {
+			return "", 0, nil, err
+		}
+		return mergedCSVPath, stat.Size(), func() {}, nil
+	case constants.ExportTaskFormatXLSX:
+		xlsxPath, fileSize, err := writeXLSXFromCSV(mergedCSVPath)
+		if err != nil {
+			return "", 0, nil, err
+		}
+		return xlsxPath, fileSize, func() { _ = os.Remove(xlsxPath) }, nil
+	default:
+		return "", 0, nil, fmt.Errorf("不支持的导出格式: %s", format)
+	}
+}
+
 func (h *ExportFinalizeHandler) handleFinalizeError(ctx context.Context, taskID uint, updater uint, prefix string, err error) error {
 	if isFinalRetry(ctx) {
 		markErr := h.taskStore.MarkFailed(ctx, taskID, updater, prefix+": "+err.Error())
--- a/internal/task/export_shard.go
+++ b/internal/task/export_shard.go
@@ -107,24 +107,38 @@ func (h *ExportShardHandler) HandleExportShard(ctx context.Context, task *asynq.
 		}
 	}

-	strategy, ok := h.sceneRegistry.Get(exportTask.Scene)
+	source, ok := h.sceneRegistry.Get(exportTask.Scene)
 	if !ok {
 		_ = h.markShardFinalFailed(ctx, exportTask.ID, shardTask.ID, updater, "导出场景未注册")
 		return asynq.SkipRetry
 	}

-	rows, err := strategy.QueryRows(ctx, exportTask, shardTask.CursorStart, shardTask.CursorEnd)
+	headers := exporter.ResolvedHeadersFromTask(exportTask)
+	if len(headers) == 0 {
+		return h.handleShardError(ctx, exportTask.ID, shardTask.ID, updater, "读取导出表头失败", fmt.Errorf("resolved_headers 为空"))
+	}
+
+	params := exporter.ParseExportParams(exportTask)
+	rows, err := source.Fetch(ctx, params, shardTask.ShardOffset, shardTask.ShardLimit)
 	if err != nil {
 		return h.handleShardError(ctx, exportTask.ID, shardTask.ID, updater, "查询分片数据失败", err)
 	}
+	if hasMisalignedRows(rows, headers) {
+		h.logger.Warn("导出分片数据列数与表头不一致，已按固定表头对齐",
+			zap.Uint("task_id", exportTask.ID),
+			zap.Uint("shard_id", shardTask.ID),
+			zap.Int("header_count", len(headers)),
+		)
+	}
+	rows = alignRowsToHeaders(rows, headers)

-	localPath, fileSize, err := writeExportFile(exportTask.Format, strategy.Headers(), rows)
+	localPath, fileSize, err := writeExportFile(constants.ExportTaskFormatCSV, headers, rows, true)
 	if err != nil {
 		return h.handleShardError(ctx, exportTask.ID, shardTask.ID, updater, "生成分片文件失败", err)
 	}
 	defer func() { _ = os.Remove(localPath) }()

-	fileName := fmt.Sprintf("%s-shard-%04d.%s", exportTask.TaskNo, shardTask.ShardNo, exportTask.Format)
+	fileName := fmt.Sprintf("%s-shard-%04d.csv.shard", exportTask.TaskNo, shardTask.ShardNo)
 	fileKey, err := uploadExportFile(ctx, h.storageSvc, localPath, fileName)
 	if err != nil {
 		return h.handleShardError(ctx, exportTask.ID, shardTask.ID, updater, "上传分片文件失败", err)
--- a/migrations/000153_alter_export_shard_task_offset.down.sql
+++ b/migrations/000153_alter_export_shard_task_offset.down.sql
@@ -0,0 +1,4 @@
+-- 回滚导出分片任务 offset/limit 分片字段
+ALTER TABLE tb_export_shard_task
+    DROP COLUMN IF EXISTS shard_limit,
+    DROP COLUMN IF EXISTS shard_offset;
--- a/migrations/000153_alter_export_shard_task_offset.up.sql
+++ b/migrations/000153_alter_export_shard_task_offset.up.sql
@@ -0,0 +1,7 @@
+-- 为导出分片任务补充 offset/limit 分片字段
+ALTER TABLE tb_export_shard_task
+    ADD COLUMN IF NOT EXISTS shard_offset BIGINT NOT NULL DEFAULT 0,
+    ADD COLUMN IF NOT EXISTS shard_limit INT NOT NULL DEFAULT 0;
+
+COMMENT ON COLUMN tb_export_shard_task.shard_offset IS '分片偏移量(offset)';
+COMMENT ON COLUMN tb_export_shard_task.shard_limit IS '分片行数上限(limit)';
--- a/pkg/storage/s3.go
+++ b/pkg/storage/s3.go
@@ -73,7 +73,7 @@ func (p *S3Provider) Upload(ctx context.Context, key string, reader io.Reader, c
 	return nil
 }

-func (p *S3Provider) Download(ctx context.Context, key string, writer io.Writer) error {
+func (p *S3Provider) Download(ctx context.Context, key string) (io.ReadCloser, error) {
 	input := &s3.GetObjectInput{
 		Bucket: aws.String(p.bucket),
 		Key:    aws.String(key),
@@ -82,17 +82,11 @@ func (p *S3Provider) Download(ctx context.Context, key string, writer io.Writer)
 	result, err := p.client.GetObjectWithContext(ctx, input)
 	if err != nil {
 		if strings.Contains(err.Error(), "NoSuchKey") {
-			return fmt.Errorf("文件不存在: %s", key)
+			return nil, fmt.Errorf("文件不存在: %s", key)
 		}
-		return fmt.Errorf("下载文件失败: %w", err)
+		return nil, fmt.Errorf("下载文件失败: %w", err)
 	}
-	defer result.Body.Close()
-
-	_, err = io.Copy(writer, result.Body)
-	if err != nil {
-		return fmt.Errorf("写入文件内容失败: %w", err)
-	}
-	return nil
+	return result.Body, nil
 }

 func (p *S3Provider) DownloadToTemp(ctx context.Context, key string) (string, func(), error) {
@@ -111,11 +105,19 @@ func (p *S3Provider) DownloadToTemp(ctx context.Context, key string) (string, fu
 		_ = os.Remove(tempPath)
 	}

-	if err := p.Download(ctx, key, tempFile); err != nil {
+	reader, err := p.Download(ctx, key)
+	if err != nil {
 		tempFile.Close()
 		cleanup()
 		return "", nil, err
 	}
+	defer reader.Close()
+
+	if _, err := io.Copy(tempFile, reader); err != nil {
+		tempFile.Close()
+		cleanup()
+		return "", nil, fmt.Errorf("写入文件内容失败: %w", err)
+	}

 	if err := tempFile.Close(); err != nil {
 		cleanup()
--- a/pkg/storage/storage.go
+++ b/pkg/storage/storage.go
@@ -8,7 +8,7 @@ import (

 type Provider interface {
 	Upload(ctx context.Context, key string, reader io.Reader, contentType string) error
-	Download(ctx context.Context, key string, writer io.Writer) error
+	Download(ctx context.Context, key string) (io.ReadCloser, error)
 	DownloadToTemp(ctx context.Context, key string) (localPath string, cleanup func(), err error)
 	Delete(ctx context.Context, key string) error
 	Exists(ctx context.Context, key string) (bool, error)