Επεξεργασία

Κοινή χρήση μέσω

Add a Root Node to JSON Output with the ROOT Option (SQL Server)

  • Άρθρο

Applies to: SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics (serverless SQL pool only)

To add a single, top-level element to the JSON output of the FOR JSON clause, specify the ROOT option.

If you don't specify the ROOT option, the JSON output doesn't include a root element.

Examples

The following table shows the output of the FOR JSON clause with and without the ROOT option.

The examples in the following table assume that the optional RootName argument is empty. If you provide a name for the root element, this value replaces the value root in the examples.

Without the ROOT option

{  
   <<json properties>>  
}  

[  
   <<json array elements>>  
]

With the ROOT option

{   
  "root": {  
   <<json properties>>  
 }  
}  

{   
  "root": [  
   << json array elements >>  
  ]  
}

Here's another example of a FOR JSON clause with the ROOT option. This example specifies a value for the optional RootName argument.

Query

SELECT TOP 5   
       BusinessEntityID As Id,  
       FirstName, LastName,  
       Title As 'Info.Title',  
       MiddleName As 'Info.MiddleName'  
   FROM Person.Person  
   FOR JSON PATH, ROOT('info')

Result

{
    "info": [{
        "Id": 1,
        "FirstName": "Ken",
        "LastName": "Sánchez",
        "Info": {
            "MiddleName": "J"
        }
    }, {
        "Id": 2,
        "FirstName": "Terri",
        "LastName": "Duffy",
        "Info": {
            "MiddleName": "Lee"
        }
    }, {
        "Id": 3,
        "FirstName": "Roberto",
        "LastName": "Tamburello"
    }, {
        "Id": 4,
        "FirstName": "Rob",
        "LastName": "Walters"
    }, {
        "Id": 5,
        "FirstName": "Gail",
        "LastName": "Erickson",
        "Info": {
            "Title": "Ms.",
            "MiddleName": "A"
        }
    }]
}

Result (without root)

[{
    "Id": 1,
    "FirstName": "Ken",
    "LastName": "Sánchez",
    "Info": {
        "MiddleName": "J"
    }
}, {
    "Id": 2,
    "FirstName": "Terri",
    "LastName": "Duffy",
    "Info": {
        "MiddleName": "Lee"
    }
}, {
    "Id": 3,
    "FirstName": "Roberto",
    "LastName": "Tamburello"
}, {
    "Id": 4,
    "FirstName": "Rob",
    "LastName": "Walters"
}, {
    "Id": 5,
    "FirstName": "Gail",
    "LastName": "Erickson",
    "Info": {
        "Title": "Ms.",
        "MiddleName": "A"
    }
}]

Learn more about JSON in SQL Server and Azure SQL Database

Microsoft videos

Note

Some of the video links in this section may not work at this time. Microsoft is migrating content formerly on Channel 9 to a new platform. We will update the links as the videos are migrated to the new platform.

For a visual introduction to the built-in JSON support in SQL Server and Azure SQL Database, see the following videos:

See Also

FOR Clause (Transact-SQL)