从 JSON 中删除方括号 - WITHOUT_ARRAY_WRAPPER 选项Remove Square Brackets from JSON - WITHOUT_ARRAY_WRAPPER Option

06/03/2020

本文内容

适用于：Applies to: SQL Server 2016 (13.x)SQL Server 2016 (13.x)SQL Server 2016 (13.x)SQL Server 2016 (13.x) 及更高版本适用于：Applies to: SQL Server 2016 (13.x)SQL Server 2016 (13.x)SQL Server 2016 (13.x)SQL Server 2016 (13.x) and later

若要删除默认括住 FOR JSON 子句的 JSON 输出的方括号，请指定 WITHOUT_ARRAY_WRAPPER 选项。To remove the square brackets that surround the JSON output of the FOR JSON clause by default, specify the WITHOUT_ARRAY_WRAPPER option. 将此选项用于单行结果，生成单个 JSON 对象作为输出，而不是生成具有单个元素的数组。Use this option with a single-row result to generate a single JSON object as output instead of an array with a single element.

如果将此选项用于多行结果，生成的输出将不会是有效的 JSON，因为存在多个元素并且缺少方括号。If you use this option with a multiple-row result, the resulting output is not valid JSON because of the multiple elements and the missing square brackets.

示例(单行结果)Example (single-row result)

以下示例介绍了在指定和未指定 WITHOUT_ARRAY_WRAPPER 选项的情况下 FOR JSON 子句的输出。The following example shows the output of the FOR JSON clause with and without the WITHOUT_ARRAY_WRAPPER option.

查询Query

SELECT 2015 as year, 12 as month, 15 as day

FOR JSON PATH, WITHOUT_ARRAY_WRAPPER

指定 结果 with the 结果Result with the WITHOUT_ARRAY_WRAPPER option

{

"year": 2015,

"month": 12,

"day": 15

}

未指定 WITHOUT_ARRAY_WRAPPER 选项的结果(默认)Result (default) without the WITHOUT_ARRAY_WRAPPER option

[{

"year": 2015,

"month": 12,

"day": 15

}]

示例(多行结果)Example (multiple-row result)

下面又通过一个示例介绍了在指定 FOR JSON 选项的情况下 WITHOUT_ARRAY_WRAPPER 选项。Here's another example of a FOR JSON clause with and without the WITHOUT_ARRAY_WRAPPER option. 本示例生成多行结果。This example produces a multiple-row result. 输出不是有效的 JSON，因为存在多个元素并且缺少方括号。The output is not valid JSON because of the multiple elements and the missing square brackets.

查询Query

SELECT TOP 3 SalesOrderNumber, OrderDate, Status

FROM Sales.SalesOrderHeader

ORDER BY ModifiedDate

FOR JSON PATH, WITHOUT_ARRAY_WRAPPER

指定 结果 with the 结果Result with the WITHOUT_ARRAY_WRAPPER option

{

"SalesOrderNumber": "SO43662",

"OrderDate": "2011-05-31T00:00:00",

"Status": 5

}, {

"SalesOrderNumber": "SO43661",

"OrderDate": "2011-05-31T00:00:00",

"Status": 5

}, {

"SalesOrderNumber": "SO43660",

"OrderDate": "2011-05-31T00:00:00",

"Status": 5

}

未指定 WITHOUT_ARRAY_WRAPPER 选项的结果(默认)Result (default) without the WITHOUT_ARRAY_WRAPPER option

[{

"SalesOrderNumber": "SO43662",

"OrderDate": "2011-05-31T00:00:00",

"Status": 5

}, {

"SalesOrderNumber": "SO43661",

"OrderDate": "2011-05-31T00:00:00",

"Status": 5

}, {

"SalesOrderNumber": "SO43660",

"OrderDate": "2011-05-31T00:00:00",

"Status": 5

}]

详细了解 SQL Server 和 Azure SQL 数据库中的 JSONLearn more about JSON in SQL Server and Azure SQL Database

Microsoft 视频Microsoft videos

有关 SQL Server 和 Azure SQL 数据库中内置 JSON 支持的视频介绍，请观看以下视频：For a visual introduction to the built-in JSON support in SQL Server and Azure SQL Database, see the following videos:

另请参阅See Also