用OPENJSON解析

编程问答 2022-08-15

问题描述

我试图从GET调用中获取响应，并通过OPEnjsON将其加载到sql Server中，但是我在解析响应时遇到了麻烦。

DECLARE @json NVARCHAR(MAX);
SET @json = N'{
  "LookupServiceType": "GetAssetValues","Items": [
    {
      "id": "19676","value": "{\"AssetCode\":\"TDAACC\",\"Symbol\":null,\"Issue\":\"ACCOUNT #49\",\"Issuer\":\"TD AMERITradE\"}"
    },{
      "id": "19677","value": "{\"AssetCode\":\"RE100\",\"Issue\":\"APN: 057\",\"Issuer\":\"SAN ANTONIO TX 78212\"}"
    },{
      "id": "19908","value": "{\"AssetCode\":\"NALIPO\",\"Issue\":\"POLICY # L0472\",\"Issuer\":\"NATIONWIDE LIFE\"}"
    }
  ]
}';

我尝试了许多变体，但我做对了。这是我尝试过的几件事。任何建议将不胜感激。

SELECT *
FROM OPEnjsON(@json,'$.Items')  
  WITH (
    Items int '$.id',value NVARCHAR(MAX) '$.value',AssetCode NVARCHAR(50) '$.value.AssetCode',Symbol NVARCHAR(50) '$.value.Symbol',Issue NVARCHAR(50) '$.value.Issue',Issuer NVARCHAR(50) '$.value.Issuer'
  );

SELECT id,AssetCode,Symbol,Issue,Issuer
FROM OPEnjsON(@json)  
  WITH (
    Items NVARCHAR(MAX) '$.Items' AS JSON
  )
OUTER APPLY OPEnjsON(Items)
  WITH (
  id INT 'strict $.id',value NVARCHAR(MAX) '$.value' AS JSON
  )
  OUTER APPLY OPEnjsON(value)
  WITH (
  AssetCode NVARCHAR(50) '$.AssetCode',Symbol NVARCHAR(50) '$.Symbol',Issue NVARCHAR(50) '$.Issue',Issuer NVARCHAR(50) '$.Issuer'
  );

解决方法

我认为您正在寻找这个。 JSON不需要任何更改

select j1.LookupServiceType,j2.id,j3.AssetCode,j3.Symbol,j3.Issue,j3.Issuer
from
  OPENJSON(@json) WITH (LookupServiceType   nvarchar(4000),Items NVARCHAR(MAX) '$.Items' AS JSON) j1
  outer APPLY
  OPENJSON(Items) WITH (id INT 'strict $.id',value NVARCHAR(MAX) '$.value' /*AS JSON*/) j2
  outer apply 
  OPENJSON([value]) WITH (AssetCode NVARCHAR(50) '$.AssetCode',Symbol NVARCHAR(50) '$.Symbol',Issue NVARCHAR(50) '$.Issue',Issuer NVARCHAR(50) '$.Issuer') j3;

结果

LookupServiceType   id      AssetCode   Symbol  Issue           Issuer
GetAssetValues      19676   TDAACC      NULL    ACCOUNT #49     TD AMERITRADE
GetAssetValues      19677   RE100       NULL    APN: 057        SAN ANTONIO TX 78212
GetAssetValues      19908   NALIPO      NULL    POLICY # L0472  NATIONWIDE LIFE
,

问题是JSON字符串的格式，您有多余的转义符和“”。

清理完JSON字符串后，您的第一个查询就可以正常工作：

DECLARE @json NVARCHAR(MAX);
SET @json = N'{
  "LookupServiceType": "GetAssetValues","Items": [
    {
      "id": "19676","value": {"AssetCode":"TDAACC","Symbol":null,"Issue":"ACCOUNT #49","Issuer":"TD AMERITRADE"}
    },{
      "id": "19677","value": {"AssetCode":"RE100","Issue":"APN: 057","Issuer":"SAN ANTONIO TX 78212"}
    },{
      "id": "19908","value": {"AssetCode":"NALIPO","Issue":"POLICY # L0472","Issuer":"NATIONWIDE LIFE"}
    }
  ]
}';

SELECT *
FROM OPENJSON(@json,'$.Items')  
  WITH (
    Items int '$.id',AssetCode NVARCHAR(50) '$.value.AssetCode',Symbol NVARCHAR(50) '$.value.Symbol',Issue NVARCHAR(50) '$.value.Issue',Issuer NVARCHAR(50) '$.value.Issuer'
  );

结果：

Items   AssetCode   Symbol  Issue           Issuer
19676   TDAACC      NULL    ACCOUNT #49     TD AMERITRADE
19677   RE100       NULL    APN: 057        SAN ANTONIO TX 78212
19908   NALIPO      NULL    POLICY # L0472  NATIONWIDE LIFE

或者，如果您不想修复JSON，则可以使用以下语句：

SELECT *
FROM OPENJSON(REPLACE(REPLACE(Replace(@json,'\',''),'"{','{'),'}"','}'),value NVARCHAR(MAX) '$.value',Issuer NVARCHAR(50) '$.value.Issuer'
  );
jsonopen-jsonparsingparsingsql-server