feat(purchase): 添加采购订单供应商名称显示功能

- 引入 ErpSupplierVo 和 ErpSupplierMapper 依赖
- 在采购订单查询接口中批量获取供应商信息
- 通过流式处理构建供应商ID到名称的映射关系
- 将供应商名称动态设置到采购订单VO对象中
- 实现供应商名称的批量查询优化避免N+1问题

klp-erp/src/main/java/com/klp/erp/domain/vo/ErpPurchaseOrderVo.java

@@ -39,6 +39,11 @@ public class ErpPurchaseOrderVo implements Serializable {
     @ExcelProperty(value = "供应商ID")
     private Long supplierId;
 
+    /**
+     * 供应商名称
+     */
+    private String supplierName;
+
     /**
      * 下单日期
      */

klp-erp/src/main/java/com/klp/erp/service/impl/ErpPurchaseOrderServiceImpl.java

@@ -13,10 +13,12 @@ import com.klp.erp.domain.ErpPurchaseOrderItem;
 import com.klp.erp.enums.PurchaseOrderStatus;
 import com.klp.erp.domain.bo.ErpPurchaseOrderBo;
 import com.klp.erp.domain.vo.ErpPurchaseOrderVo;
+import com.klp.erp.domain.vo.ErpSupplierVo;
 import com.klp.erp.mapper.ErpPurchaseOrderItemMapper;
 import com.klp.erp.mapper.ErpPurchaseOrderMapper;
 import com.klp.erp.mapper.ErpPurchaseReceiptMapper;
 import com.klp.erp.mapper.ErpPurchaseReturnItemMapper;
+import com.klp.erp.mapper.ErpSupplierMapper;
 import com.klp.erp.service.IErpPurchaseOrderService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
@@ -25,6 +27,8 @@ import java.math.BigDecimal;
 import java.util.Collection;
 import java.util.Date;
 import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
 
 /**
  * 采购订单主Service业务层处理
@@ -40,6 +44,7 @@ public class ErpPurchaseOrderServiceImpl implements IErpPurchaseOrderService {
     private final ErpPurchaseOrderItemMapper orderItemMapper;
     private final ErpPurchaseReceiptMapper receiptMapper;
     private final ErpPurchaseReturnItemMapper returnItemMapper;
+    private final ErpSupplierMapper supplierMapper;
 
     /**
      * 查询采购订单主
@@ -56,6 +61,37 @@ public class ErpPurchaseOrderServiceImpl implements IErpPurchaseOrderService {
     public TableDataInfo<ErpPurchaseOrderVo> queryPageList(ErpPurchaseOrderBo bo, PageQuery pageQuery) {
         LambdaQueryWrapper<ErpPurchaseOrder> lqw = buildQueryWrapper(bo);
         Page<ErpPurchaseOrderVo> result = baseMapper.selectVoPage(pageQuery.build(), lqw);
+        
+        // 批量查询供应商名称并映射
+        if (result.getRecords() != null && !result.getRecords().isEmpty()) {
+            // 收集所有供应商ID
+            List<Long> supplierIds = result.getRecords().stream()
+                    .map(ErpPurchaseOrderVo::getSupplierId)
+                    .filter(id -> id != null)
+                    .distinct()
+                    .collect(Collectors.toList());
+            
+            if (!supplierIds.isEmpty()) {
+                // 批量查询供应商信息
+                List<ErpSupplierVo> suppliers = supplierMapper.selectVoBatchIds(supplierIds);
+                
+                // 构建供应商ID到名称的映射
+                Map<Long, String> supplierNameMap = suppliers.stream()
+                        .collect(Collectors.toMap(
+                                ErpSupplierVo::getSupplierId,
+                                ErpSupplierVo::getName,
+                                (existing, replacement) -> existing // 处理重复key的情况
+                        ));
+                
+                // 将供应商名称设置到采购订单VO中
+                result.getRecords().forEach(order -> {
+                    if (order.getSupplierId() != null) {
+                        order.setSupplierName(supplierNameMap.get(order.getSupplierId()));
+                    }
+                });
+            }
+        }
+        
         return TableDataInfo.build(result);
     }