update mybatis

loit-mybatis-example-main/src/main/java/com/loit/mybatis/example/controller/TStorageController.java

@@ -53,7 +53,12 @@ public class TStorageController {
     void testCache(Integer storageId) {
 
         TStorage storageCache = iTStorageCacheService.getStorageCache(storageId);
+        if (storageCache != null) {
             log.info(storageCache.toString());
+        } else {
+            log.info("getStorageCache is null");
+        }
+
     }