[英]Extract data from Json string and divide into multiple columns
我在具有Jsonstring文本的表中有一列:
[
{
"PType":{"code":"9","name":"Hospitality"},
"PSubType":{"code":"901","name":"Hotel"},
"AType":{"code":"9","name":"Hospitality"},
"ASubType":{"code":"901","name":"Hotel"}
}
]
如何使用SQL Server查詢將其分為多個列?
借助SQL-Server 2016+, 本機JSON支持 :
DECLARE @json NVARCHAR(MAX)=
N'[
{
"PType":{"code":"9","name":"Hospitality"},
"PSubType":{"code":"901","name":"Hotel"},
"AType":{"code":"9","name":"Hospitality"},
"ASubType":{"code":"901","name":"Hotel"}
}
]';
SELECT A.[key]
,JSON_VALUE(A.value,'$.code') AS Code
,JSON_VALUE(A.value,'$.name') AS [Name]
FROM OPENJSON(JSON_QUERY(@json,'$[0]')) A;
結果
key Code Name
---------------------------------
PType 9 Hospitality
PSubType 901 Hotel
AType 9 Hospitality
ASubType 901 Hotel
使用JSON_QUERY()
您可以獲取數組中的元素, OPENJSON
將在其中查找所有對象,並將它們作為派生表返回。
JSON_VALUE
將內部信息讀入列。
對於v2016以下的版本,您應該使用其他工具或考慮CLR功能...
在SQL Server 2016+中,您可以結合使用openjson
(更多信息在此處 )和cross apply
:
declare @json nvarchar(max) = '[ { "PType":{"code":"9","name":"Hospitality"}, "PSubType":{"code":"901","name":"Hotel"}, "AType":{"code":"9","name":"Hospitality"}, "ASubType":{"code":"901","name":"Hotel"} } ]'
select
[PT].[code] as Ptype_Code
,[PT].[name] as Ptype_Name
,[PS].[code] as PSubType_Code
,[PS].[name] as PSubType_Name
,[AT].[code] as AType_Code
,[AT].[name] as AType_Name
,[AS].[code] as ASubType_Code
,[AS].[name] as ASubType_Name
from openjson (@json)
with
(
PType nvarchar(max) as json,
PSubType nvarchar(max) as json,
AType nvarchar(max) as json,
ASubType nvarchar(max) as json
) as lev1
cross apply openjson (lev1.PType)
with
(
code int,
name nvarchar(100)
) as PT
cross apply openjson (lev1.PSubType)
with
(
code int,
name nvarchar(100)
) as PS
cross apply openjson (lev1.AType)
with
(
code int,
name nvarchar(100)
) as [AT]
cross apply openjson (lev1.ASubType)
with
(
code int,
name nvarchar(100)
) as [AS]
結果:
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