Question

我试图通过从结果字符串创建JSON对象来解析JSON，然后将其解析为JSON数组并循环遍历它。

DECLARE @DELETED TABLE(
        Id BIGINT
    );


WITH LoopCTE AS (
  SELECT Id, ParentId,0 AS steps
  FROM dbo.Some_tb
  WHERE Id IN (SELECT Id FROM deleted)

  UNION ALL

  SELECT mgr.Id, mgr.ParentId, parent.steps +1 AS steps
  FROM LoopCTE AS parent
    INNER JOIN dbo.Some_tb AS mgr
      ON parent.Id = mgr.ParentId
)
INSERT INTO @DELETED SELECT Id FROM LoopCTE AS u;

/*Delete from another table*/
DELETE FROM SomeOther_tb WHERE OtherId IN(SELECT Id FROM @DELETED);


/*Delete childs from this table*/  <-- No longer required
/*DELETE FROM Some_tb WHERE ParentId IN(SELECT Id FROM @DELETED);*/

/*Delete from this table*/
DELETE FROM Some_tb WHERE Id IN(SELECT Id FROM @DELETED);

JSONObject jsonobject = new JSONObject(json_string)是URL执行的结果。我的JSON看起来像这样。

json_string

这条线 {"ResultO":[{"Surname":null,"Firstname":null,"NRC":null}]}会出现空指针异常。我该如何解决这个问题？

Answer 1

异常即将发生，因为您的json_string为null或为空，请在继续之前检查if (!TextUtils.isEmpty(json_string)) {}。如果您的密钥的空值为key_value:null，那么JSONObject永远不会抛出异常，而是将您的值设置为String“null”。

如何解析JSON消除nullpointer异常

1 个答案: