sql-server - T-SQL OPENJSON 路径作为变量

Question

declare @Path as nvarchar(100) 
set @path = '$.path.to."sub-object"'

DECLARE @json NVARCHAR(4000) = N'{  
      "path": {  
            "to":{  
                 "sub-object":["en-GB", "en-UK","de-AT","es-AR","sr-Cyrl"]  
                 }  
              }  
 }';

SELECT [key], value
FROM OPENJSON(@json, @Path)

我有错误:

Incorrect syntax near '@Path'.

如何声明我可以更改它的@path。

Answer 1

将路径作为变量传递给 OPENJSON可从 SQL Server 2017 获得(又名 vNext):

In SQL Server 2017 and in Azure SQL Database, you can provide a variable as the value of path.

declare @Path as nvarchar(100) 
set @path = '$.path.to."sub-object"'

DECLARE @json NVARCHAR(4000) = N'{  
      "path": {  
            "to":{  
                 "sub-object":["en-GB", "en-UK","de-AT","es-AR","sr-Cyrl"]  
                 }  
              }  
 }';

SELECT [key], value
FROM OPENJSON(@json, @Path);

DbFiddle Demo