Question

我已经在SQL Server中使用FOR JSON PATH生成了一个Json文档，但是，当我尝试将其解析回表时，我只会得到NULL。

SELECT * 
FROM OPENJSON('{"Customer":[{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11060,"UnitPrice":45.6000,"ProductsOnOrder":15,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11061,"UnitPrice":18.0000,"ProductsOnOrder":21,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11062,"UnitPrice":12.0000,"ProductsOnOrder":2,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11187,"UnitPrice":43.9000,"ProductsOnOrder":20,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11217,"UnitPrice":10.0000,"ProductsOnOrder":6,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11218,"UnitPrice":18.0000,"ProductsOnOrder":15,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11554,"UnitPrice":55.0000,"ProductsOnOrder":15,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11555,"UnitPrice":13.0000,"ProductsOnOrder":2,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11846,"UnitPrice":25.0000,"ProductsOnOrder":16,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11847,"UnitPrice":45.6000,"ProductsOnOrder":2,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11992,"UnitPrice":13.2500,"ProductsOnOrder":40,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11993,"UnitPrice":21.5000,"ProductsOnOrder":20,"ShipCity":"Berlin"}]}')
WITH
(
    CustomerID NVARCHAR(255) '$.Customer'
)

Answer 1

赞：

declare @json nvarchar(max) = N'{"Customer":[{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11060,"UnitPrice":45.6000,"ProductsOnOrder":15,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11061,"UnitPrice":18.0000,"ProductsOnOrder":21,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11062,"UnitPrice":12.0000,"ProductsOnOrder":2,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11187,"UnitPrice":43.9000,"ProductsOnOrder":20,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11217,"UnitPrice":10.0000,"ProductsOnOrder":6,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11218,"UnitPrice":18.0000,"ProductsOnOrder":15,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11554,"UnitPrice":55.0000,"ProductsOnOrder":15,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11555,"UnitPrice":13.0000,"ProductsOnOrder":2,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11846,"UnitPrice":25.0000,"ProductsOnOrder":16,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11847,"UnitPrice":45.6000,"ProductsOnOrder":2,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11992,"UnitPrice":13.2500,"ProductsOnOrder":40,"ShipCity":"Berlin"},{"CustomerID":10021,"CustomerNumber":"ALFKI","Customer":"Alfreds Futterkiste","City":"Berlin","OrderID":11993,"UnitPrice":21.5000,"ProductsOnOrder":20,"ShipCity":"Berlin"}]}'


SELECT * 
FROM OPENJSON(@json,'$.Customer') 
      WITH
      (
        CustomerID NVARCHAR(255) '$.CustomerID'
      )

Answer 2

您需要在OPENJSON中指定一个JSON Path表达式，以选择所需的数据。 WITH适用于JSON Path表达式的结果。

没有它，将分析根对象，并且每个属性返回一行。在这种情况下，它是Customer，带有一个值数组。如果您使用OPENJSON而不使用路径，则会得到：

key       value              type
Customer  [{"Customer".....  4

如果根对象包含另一个属性，例如"moo":123，它将在另一行中返回：

key       value              type
Customer  [{"Customer".....  4
moo       123                2

要选择Customer属性的内容，您需要使用$.Customer路径。这将返回数组项：

SELECT *
FROM OPENJSON(@json,'$.Customer')

Results
-------

0   {"CustomerID":10021,"CustomerN  5
1   {"CustomerID":10021,"CustomerN  5

现在适用于数组项和：

SELECT *
FROM OPENJSON(@json,'$.Customer')
WITH(
    CustomerID NVARCHAR(255) '$.CustomerID',
    CustomerNumber NVARCHAR(255) '$.CustomerNumber',
    Customer NVARCHAR(255) '$.Customer'
)

会返回

CustomerID  CustomerNumber  Customer
10021       ALFKI           Alfreds Futterkiste
10021       ALFKI           Alfreds Futterkiste
10021       ALFKI           Alfreds Futterkiste

无法将Json解析回SQL Server中的表

2 个答案: