使用JSON_VALUE访问SQL Server 2016中的JSON数组 [英] Accessing JSON Array in SQL Server 2016 using JSON_VALUE

问题描述

在使用新引入的JSON_VALUE函数访问json内的数组时，我陷入了困境.请考虑以下代码-

I am stuck while accessing array inside json using newly introduced JSON_VALUE function. Please consider following code -

IF EXISTS(SELECT 1 FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME='JsonData')
    DROP TABLE JsonData;
go

CREATE TABLE JsonData(JsonData nvarchar(max));
DECLARE @SQL nvarchar(max);
DECLARE @Table AS TABLE(JsonPath VARCHAR(256));

INSERT INTO JsonData(JsonData)
VALUES(
'{
  "firstName": "John",
  "lastName" : "doe",
  "age"      : 26,
  "address"  : {
    "streetAddress": "naist street",
    "city"         : "Nara",
    "postalCode"   : "630-0192"
  },
  "phoneNumbers": [
    {
      "type"  : "iPhone",
      "number": "0123-4567-8888"
    },
    {
      "type"  : "home",
      "number": "0123-4567-8910"
    }
  ]
}')


INSERT INTO @Table
SELECT VALUE  FROM OPENJSON('{
"Path1":"$.firstName","Path2":"$.phoneNumbers[:1].number"
}') ;

SELECT  @SQL=(SELECT 'UNION SELECT '''+ CAST(JsonPath AS VARCHAR(256)) +''',JSON_VALUE(JsonData,'''+a.JsonPath+''')  
                    FROM JsonData a'                             
                    FROM @Table a       
        FOR XML PATH(''), TYPE)
    .value('.','NVARCHAR(MAX)')
FROM @Table t;

SELECT @SQL=RIGHT(@SQL,LEN(@SQL)-5)

PRINT @SQL    

EXEC SP_EXECUTESQL @SQL;

在这里，如果我要访问特定的电话号码，则访问该节点的常规语法不起作用.在这种情况下，我遇到以下错误

Here If I want to access specific phone number then usual syntax of accessing this node is not working. I am getting following error in this case

JSON path is not properly formatted. Unexpected character ':' is found at position 15.

尽管当我在 http://jsonpath.com 进行检查时，我仍能够检索到值. SQL Server 2016是否使用某些不同的语法来访问JSON值?

Though when I checked at http://jsonpath.com , I am able to retrieve value. Does SQL server 2016 uses some different syntax for accessing JSON values?

推荐答案

要从phoneNumbers中获取全部信息:

To get all from phoneNumbers:

DECLARE @json nvarchar(max)=
    '{
      "firstName": "John",
      "lastName" : "doe",
      "age"      : 26,
      "address"  : {
        "streetAddress": "naist street",
        "city"         : "Nara",
        "postalCode"   : "630-0192"
      },
      "phoneNumbers": [
        {
          "type"  : "iPhone",
          "number": "0123-4567-8888"
        },
        {
          "type"  : "home",
          "number": "0123-4567-8910"
        }
      ]
    }'

    SELECT [Type], [Number]
    FROM OPENJSON( @json, '$.phoneNumbers' ) 
    WITH ([Type] NVARCHAR(25) '$.type', [Number] NVARCHAR(25) '$.number');

这篇关于使用JSON_VALUE访问SQL Server 2016中的JSON数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！