如何使用 openjson 读取存储在 SQL Server 中的 Json 列下方？

Question

Declare @ResponseText nvarchar(4000)

set @responseText ='{
    "submissions": [
        {
        "xml_id":"id_x5d94851726b470.68571510",
        "fields": [ 
            {"fieldvalue":"customerEmail@xyzdomain.com","fieldid":"57282490"},
            {"fieldvalue":"123","fieldid":"57282423"},
            {"fieldvalue":"12345-678900","fieldid":"57282500"}, 
            {"fieldvalue":"Test Message here ","fieldid":"57282564"}
         ]
         }
    ]
 }'

 SELECT  *
 FROM OPENJSON (@ResponseText, '$.submissions') WITH (
    ID NVARCHAR(100) '$.xml_id',
    $.fields.field NVARCHAR(100) ...
 )

etc 其余的所有记录？字段数组下的其余字段我得到“NULL”

Answer 1

你可以这样试试：

Declare @ResponseText nvarchar(4000)

set @responseText ='{
    "submissions": [
        {
        "xml_id":"id_x5d94851726b470.68571510",
        "fields": [ 
            {"fieldvalue":"customerEmail@xyzdomain.com","fieldid":"57282490"},
            {"fieldvalue":"123","fieldid":"57282423"},
            {"fieldvalue":"12345-678900","fieldid":"57282500"}, 
            {"fieldvalue":"Test Message here ","fieldid":"57282564"}
         ]
         }
    ]
 }'

--查询

 SELECT A.ID
       ,B.*
 FROM OPENJSON (@ResponseText, '$.submissions') 
      WITH (ID NVARCHAR(100) '$.xml_id'
           ,fields NVARCHAR(MAX) AS JSON) A
 OUTER APPLY OPENJSON(a.fields)
             WITH(fieldvalue NVARCHAR(150)
                 ,fieldid BIGINT) B;

结果

ID                          fieldvalue                  fieldid
id_x5d94851726b470.68571510 customerEmail@xyzdomain.com 57282490
id_x5d94851726b470.68571510 123                         57282423
id_x5d94851726b470.68571510 12345-678900                57282500
id_x5d94851726b470.68571510 Test Message here           57282564

简而言之：

您开始正确地使用WITH-子句读取xml_id。属性fields 只不过是同一级别的另一个元素。但我们将其退回AS JSON。这将允许添加另一个APPLY OPENJSON()，传入我们从$.fields 获得的片段并使用另一个WITH 子句来获取数组中对象的两个属性。