优化分类树加载逻辑，新增批量查询子节点接口以减少数据库往返，提升性能。重构相关服务和控制器，确保系统的可维护性和扩展性。

jeecg-boot/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/system/controller/SysCategoryController.java

@@ -416,13 +416,7 @@ public class SysCategoryController {
          * 递归求子节点 同步加载用到
      */
   	private void loadAllCategoryChildren(List<TreeSelectModel> ls) {
-  		for (TreeSelectModel tsm : ls) {
-			List<TreeSelectModel> temp = this.sysCategoryService.queryListByPid(tsm.getKey());
-			if(temp!=null && temp.size()>0) {
-				tsm.setChildren(temp);
-				loadAllCategoryChildren(temp);
-			}
-		}
+		this.sysCategoryService.fillCategoryChildrenBatch(ls);
   	}
 
 	 /**

jeecg-boot/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/system/mapper/SysCategoryMapper.java

@@ -28,6 +28,11 @@ public interface SysCategoryMapper extends BaseMapper<SysCategory> {
 	 */
 	public List<TreeSelectModel> queryListByPid(@Param("pid")  String pid,@Param("query") Map<String, String> query);
 
+	/**
+	 * 批量按父 id 查询子节点（树同步加载按层拉取，避免 N+1）
+	 */
+	List<TreeSelectModel> queryListByPidIn(@Param("pids") List<String> pids, @Param("query") Map<String, String> query);
+
     /**
      * 通过code查询分类字典表
      * @param code

jeecg-boot/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/system/mapper/xml/SysCategoryMapper.xml

@@ -33,5 +33,36 @@
 			</if>
 	</select>
 
+	<select id="queryListByPidIn" resultType="org.jeecg.modules.system.model.TreeSelectModel">
+		select code,
+			   name as "title",
+			   id as "key",
+			   (case when has_child = '1' then 0 else 1 end) as isLeaf,
+			   pid as parentId
+			   from sys_category
+			where pid in
+			<foreach collection="pids" item="item" open="(" separator="," close=")">
+				#{item}
+			</foreach>
+			<if test="query!= null">
+				<if test="query.code !=null and query.code != ''">
+					and code = #{query.code}
+				</if>
+				<if test="query.name !=null and query.name != ''">
+					and name = #{query.name}
+				</if>
+				<if test="query.id !=null and query.id != ''">
+					and id = #{query.id}
+				</if>
+				<if test="query.createBy !=null and query.createBy != ''">
+					and create_by = #{query.createBy}
+				</if>
+				<if test="query.sysOrgCode !=null and query.sysOrgCode != ''">
+					and sys_org_code = #{query.sysOrgCode}
+				</if>
+			</if>
+			order by code
+	</select>
+
 
 </mapper>

jeecg-boot/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/system/service/ISysCategoryService.java

@@ -98,4 +98,11 @@ public interface ISysCategoryService extends IService<SysCategory> {
 	 */
 	List<String> loadDictItemByNames(String names, boolean delNotExist);
 
+	/**
+	 * 按层批量补全子节点（替代逐节点递归 queryListByPid，显著减少数据库往返）
+	 *
+	 * @param nodes 首层节点列表（通常来自 {@link #queryListByCode}）
+	 */
+	void fillCategoryChildrenBatch(List<TreeSelectModel> nodes);
+
 }

jeecg-boot/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/system/service/impl/SysCategoryServiceImpl.java

@@ -126,6 +126,37 @@ public class SysCategoryServiceImpl extends ServiceImpl<SysCategoryMapper, SysCa
 		return baseMapper.queryListByPid(pid,condition);
 	}
 
+	@Override
+	public void fillCategoryChildrenBatch(List<TreeSelectModel> nodes) {
+		if (nodes == null || nodes.isEmpty()) {
+			return;
+		}
+		List<TreeSelectModel> frontier = new ArrayList<>(nodes);
+		while (!frontier.isEmpty()) {
+			List<String> pids = frontier.stream().map(TreeSelectModel::getKey).filter(Objects::nonNull).collect(Collectors.toList());
+			if (pids.isEmpty()) {
+				break;
+			}
+			List<TreeSelectModel> allChildren = baseMapper.queryListByPidIn(pids, null);
+			if (allChildren == null || allChildren.isEmpty()) {
+				break;
+			}
+			Map<String, List<TreeSelectModel>> byParent = allChildren.stream().collect(Collectors.groupingBy(TreeSelectModel::getParentId));
+			List<TreeSelectModel> nextFrontier = new ArrayList<>();
+			for (TreeSelectModel parent : frontier) {
+				List<TreeSelectModel> ch = byParent.get(parent.getKey());
+				if (ch != null && !ch.isEmpty()) {
+					parent.setChildren(ch);
+					nextFrontier.addAll(ch);
+				}
+			}
+			if (nextFrontier.isEmpty()) {
+				break;
+			}
+			frontier = nextFrontier;
+		}
+	}
+
 	@Override
 	public String queryIdByCode(String code) {
 		return baseMapper.queryIdByCode(code);

jeecgboot-vue3/src/views/mes/material/MesMixerMaterialList.vue

@@ -114,6 +114,8 @@ const { tableContext, onExportXls, onImportXls } = useListPage({
     title: '密炼物料信息',
     api: list,
     columns,
+    // 避免：表格默认 immediate 请求一次 + onMounted 末尾 reload 再请求一次（进入页列表闪两次）
+    immediate: false,
     canResize: true,
     formConfig: { labelWidth: 120, schemas: searchFormSchema, autoSubmitOnEnter: true, showAdvancedButton: true },
     actionColumn: { width: 120 },
@@ -227,9 +229,8 @@ function findNodeByKey(nodes: Recordable[], key: string): Recordable | null {
 async function loadCategoryTree() {
   treeLoading.value = true;
   try {
-    const root = await fetchMaterialCategoryRoot();
+    const [root, res] = await Promise.all([fetchMaterialCategoryRoot(), loadCategoryTreeRoot({ async: false, pcode: 'XSLMES_MATERIAL' })]);
     materialCategoryRootId.value = root?.id != null ? String(root.id) : '';
-    const res = await loadCategoryTreeRoot({ async: false, pcode: 'XSLMES_MATERIAL' });
     rawCategoryTree.value = Array.isArray(res) ? res : [];
     if (!materialCategoryRootId.value || !rawCategoryTree.value.length) {
       createMessage.warning('未加载到物料分类树，请确认分类字典根编码 XSLMES_MATERIAL 已存在。');

jeecgboot-vue3/src/views/xslmes/mesXslUnit/MesXslUnitList.vue

@@ -271,9 +271,9 @@
   async function loadCategoryTree() {
     treeLoading.value = true;
     try {
-      const root = await fetchUnitCategoryRoot();
+      // 根节点查询与整棵树接口并行，减少串行等待；后端已改为按层批量查子节点，降低 DB 往返
+      const [root, res] = await Promise.all([fetchUnitCategoryRoot(), loadUnitCategoryTreeRoot({ async: false, pcode: 'XSLMES_UNIT' })]);
       unitCategoryRootId.value = root?.id != null ? String(root.id) : '';
-      const res = await loadUnitCategoryTreeRoot({ async: false, pcode: 'XSLMES_UNIT' });
       rawUnitCategoryTree.value = Array.isArray(res) ? res : [];
       if (!unitCategoryRootId.value || !rawUnitCategoryTree.value.length) {
         createMessage.warning('未加载到单位分类树，请确认已执行库脚本且分类字典根编码为 XSLMES_UNIT。');
@@ -295,6 +295,8 @@
       title: '单位管理',
       api: list,
       columns,
+      // 避免：表格默认 immediate 请求一次 + onMounted 末尾 reload 再请求一次（进入页列表闪两次）
+      immediate: false,
       canResize: true,
       formConfig: {
         schemas: searchFormSchema,

jeecgboot-vue3/src/views/xslmes/mesXslWarehouse/MesXslWarehouseList.vue

@@ -294,9 +294,8 @@
   async function loadCategoryTree() {
     treeLoading.value = true;
     try {
-      const root = await fetchWarehouseCategoryRoot();
+      const [root, res] = await Promise.all([fetchWarehouseCategoryRoot(), loadCategoryTreeRoot({ async: false, pcode: 'XSLMES_WH' })]);
       warehouseCategoryRootId.value = root?.id != null ? String(root.id) : '';
-      const res = await loadCategoryTreeRoot({ async: false, pcode: 'XSLMES_WH' });
       rawWarehouseCategoryTree.value = Array.isArray(res) ? res : [];
       if (!warehouseCategoryRootId.value || !rawWarehouseCategoryTree.value.length) {
         createMessage.warning('未加载到仓库分类树，请确认已执行库脚本并已在「分类字典」中维护根节点 XSLMES_WH。');
@@ -385,6 +384,8 @@
       title: '仓库管理',
       api: list,
       columns,
+      // 避免：表格默认 immediate 请求一次 + onMounted 末尾 reload 再请求一次（进入页列表闪两次）
+      immediate: false,
       canResize: true,
       formConfig: {
         schemas: searchFormSchema,