数据源预览错误提示修改

bi-server/src/main/java/com/usoftchina/bi/server/service/dataSource/DataConnectorService.java

@@ -343,8 +343,8 @@ public class DataConnectorService {
             columnValuesInfo.setValues(pageInfo);
         } catch (Exception e) {
             e.printStackTrace();
-            logger.error("异常");
-            return new RepEntity(RepCode.erro);
+            logger.error(e.getMessage());
+            throw new MyException(e.getCause().getMessage());
         } finally {
             logger.info("关闭数据源");
             DynamicDataSourceContextHolder.clearDataSourceType();