JSON_MODIFY在SQL Server 2017中无法正常工作

Question

这是我的代码：

DECLARE @info NVARCHAR(MAX) = '{"searchQuery":{"reportType":"ReportedHcEcg"},"pageQuery":{"pageNumber":1,"pageSize":10,"sortColumnName":"Urgent, UploaDateTime","sortOrder":"Desc"}}'
SET @info = JSON_MODIFY(@info, '$.searchQuery.reportType', NULL)
SELECT @info

当我尝试删除第二行代码中的reportType字段时，我的输出应该是通过如下所示从reportType中删除searchQuery来得到的

{"searchQuery":{},"pageQuery":{"pageNumber":1,"pageSize":10,"sortColumnName":"Urgent, UploaDateTime","sortOrder":"Desc"}}

相反，它就像下面的

{"searchQuery":{"pageSize":10,"sortColumnName":"Urgent, UploaDateTime","sortOrder":"Desc"}}

我无法理解SQL Server的这种行为。有什么帮助吗？

Answer 1

这是一种解决方法：提取，编辑并将子对象替换为对象。

DECLARE @info NVARCHAR(MAX) = '{"searchQuery":{"reportType":"ReportedHcEcg"},"pageQuery":{"pageNumber":1,"pageSize":10,"sortColumnName":"Urgent, UploaDateTime","sortOrder":"Desc"}}'
SET @info = JSON_MODIFY(@info, '$.searchQuery', JSON_MODIFY(JSON_QUERY(@info, '$.searchQuery'), '$.reportType', NULL))
SELECT @info