feat(oa/erp): 新增项目计划变更记录查询接口

- 在ErpProjectChangeController中新增根据项目计划ID查询变更记录的接口
- 实现service层queryByProjectPlanId方法，支持通过项目计划ID关联查询项目变更记录
- 优化项目变更提交逻辑，增加项目存在性校验
- 调整projectChangeSubmitAndFlowStart方法返回值类型为Boolean
- 完善变更记录查询功能，支持关联预算和进度子表数据

ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/controller/ErpProjectChangeController.java

@@ -136,4 +136,16 @@ public class ErpProjectChangeController extends BaseController {
         return toAjax(erpProjectChangeService.projectChangeSubmitAndFlowStart(bo));
     }
 
+    /**
+     * 查询指定项目计划的所有变更记录
+     *
+     * @param projectPlanId 项目计划ID
+     */
+    @SaCheckPermission("oa/erp:erpProjectChange:query")
+    @GetMapping("/queryByProjectPlanId/{projectPlanId}")
+    public R<List<ErpProjectChangeVo>> queryByProjectPlanId(@NotNull(message = "项目计划ID不能为空")
+                                                             @PathVariable("projectPlanId") Long projectPlanId) {
+        return R.ok(erpProjectChangeService.queryByProjectPlanId(projectPlanId));
+    }
+
 }

ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/IErpProjectChangeService.java

@@ -81,5 +81,13 @@ public interface IErpProjectChangeService {
      * @param bo 项目变更申请
      * @return 是否成功
      */
-    ErpProjectChangeVo projectChangeSubmitAndFlowStart(ErpProjectChangeBo bo);
+    Boolean projectChangeSubmitAndFlowStart(ErpProjectChangeBo bo);
+
+    /**
+     * 查询指定项目计划的所有变更记录
+     *
+     * @param projectPlanId 项目计划 ID
+     * @return 变更记录列表
+     */
+    List<ErpProjectChangeVo> queryByProjectPlanId(Long projectPlanId);
 }

ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpProjectChangeServiceImpl.java

@@ -189,6 +189,18 @@ public class ErpProjectChangeServiceImpl implements IErpProjectChangeService {
         // 权限校验：只有项目经理才能提交
         validateProjectManager(bo.getProjectManagerId());
 
+        Long projectId = bo.getProjectId();
+        ErpProjectInfo projectInfo = projectInfoMapper.selectById(projectId);
+        if (projectInfo == null) {
+            throw new ServiceException("项目不存在");
+        }
+        // 验证项目状态
+/*
+        if (!OAStatusEnum.COMPLETED.getStatus().equals(projectInfo.getProjectStatus())) {
+            throw new ServiceException("项目未审批通过");
+        }
+*/
+
         ErpProjectChange add = MapstructUtils.convert(bo, ErpProjectChange.class);
         validEntityBeforeSave(add);
 
@@ -558,6 +570,61 @@ public class ErpProjectChangeServiceImpl implements IErpProjectChangeService {
         //TODO 做一些数据校验,如唯一约束
     }
 
+    /**
+     * 查询指定项目计划的所有变更记录
+     * 注意：ErpProjectChange 绑定的是 project_id 而非 project_plan_id
+     * 需要先通过项目计划查询出项目ID，再查询该项目的所有变更记录
+     *
+     * @param projectPlanId 项目计划 ID
+     * @return 变更记录列表
+     */
+    @Override
+    public List<ErpProjectChangeVo> queryByProjectPlanId(Long projectPlanId) {
+        if (projectPlanId == null) {
+            return new ArrayList<>();
+        }
+
+        // 第一步：通过项目计划ID查询项目计划信息，获取项目ID
+        ErpProjectPlan projectPlan = projectPlanMapper.selectById(projectPlanId);
+        if (projectPlan == null || projectPlan.getProjectId() == null) {
+            return new ArrayList<>();
+        }
+
+        Long projectId = projectPlan.getProjectId();
+
+        // 第二步：通过项目ID查询该项目的所有变更记录
+        LambdaQueryWrapper<ErpProjectChange> lqw = Wrappers.lambdaQuery(ErpProjectChange.class)
+            .eq(ErpProjectChange::getProjectId, projectId)
+            .eq(ErpProjectChange::getDelFlag, "0")
+            .orderByDesc(ErpProjectChange::getCreateTime);
+
+        List<ErpProjectChange> list = baseMapper.selectList(lqw);
+
+        // 第三步：转换为VO并关联子表数据
+        List<ErpProjectChangeVo> voList = new ArrayList<>();
+        for (ErpProjectChange entity : list) {
+            ErpProjectChangeVo vo = MapstructUtils.convert(entity, ErpProjectChangeVo.class);
+
+            // 关联子表数据
+            vo.setBudgetList(changeBudgetMapper.selectList(
+                Wrappers.lambdaQuery(ErpProjectChangeBudget.class)
+                    .eq(ErpProjectChangeBudget::getProjectChangeId, entity.getProjectChangeId())
+                    .eq(ErpProjectChangeBudget::getDelFlag, "0")
+            ));
+
+            vo.setProgressList(changeProgressMapper.selectList(
+                Wrappers.lambdaQuery(ErpProjectChangeProgress.class)
+                    .eq(ErpProjectChangeProgress::getProjectChangeId, entity.getProjectChangeId())
+                    .eq(ErpProjectChangeProgress::getDelFlag, "0")
+                    .orderByAsc(ErpProjectChangeProgress::getSortOrder)
+            ));
+
+            voList.add(vo);
+        }
+
+        return voList;
+    }
+
     /**
      * 项目变更流程监听器
      *