新增案例接口，添加报错提示

src/main/java/com/sztzjy/money_management/controller/CaseController.java

@@ -198,7 +198,7 @@ public class CaseController {
 
 
     @PostMapping("/insertKnowledge")
-    @ApiOperation("知识点新增")
+    @ApiOperation("知识点新增/编辑")
     @AnonymousAccess
     private ResultEntity<HttpStatus> insertKnowledge(@ApiParam("请求头可能装不下,放对象,传ID和knowledge") @RequestBody Chapter chapter) {
         Chapter newChapter = chapterMapper.selectByPrimaryKey(chapter.getChapterId());

src/main/java/com/sztzjy/money_management/service/impl/CaseServiceImpl.java

@@ -150,6 +150,10 @@ public class CaseServiceImpl implements CaseService {
         //新增 综合规划表 和 客户案例信息表  包含修改
         String caseId = adminOrTeaInsert("master", caseInfo);
 
+        //为null代表上一步报错了
+        if ("false".equals(caseId)){
+            return  new ResultEntity<HttpStatus>("系统已存在该身份证，请重试！");
+        }
         //财务分析现金流量表
         CaseCashFlow caseCashFlow = new CaseCashFlow();
         if (stuCaseDto.getCaseCashFlow() != null) {
@@ -538,6 +542,11 @@ public class CaseServiceImpl implements CaseService {
                 return newCase.getCaseid();
             } else {
                 //修改案例信息表
+
+                //传了相同的身份证，系统判定是编辑，但是没传CaseId，直接return
+                if (StringUtils.isBlank(newCase.getCaseid())) {
+                    return "false";
+                }
                 caseInfoMapper.updateByPrimaryKeySelective(newCase);
 
                 //修改实训类型