在将 JSON 列转换为 SQL 表时需要帮助

Question

在将 JSON 列转换为 SQL Server 表时需要帮助。

我有一个存储 JSON 格式值的 SQL Server nvarchar(max) 列，如下所示。

我想把数据转换成表格格式来生成一些报告。

请检查示例数据以及预期结果。

CREATE TABLE ##TempTable
(
    rawdata nvarchar(max)
)

INSERT INTO ##TempTable (rawdata) 
VALUES (
'[
    [
    {"key":"ID","value":"123"},
    {"key":"Name","value":"abc"},
    {"key":"Program","value":"qew"},
    {"key":"Type","value":"tyu"},
    {"key":"Section","value":"dd"},
    {"key":"Director","value":"ghghjg"},
    {"key":"Project","value":"hkhjk"},
    {"key":"Manager","value":"fghfgf"},
    {"key":"PCM","value":"gnhghj"},
    {"key":"Contractor","value":"gghgh"},
    {"key":"Client","value":"gghhg"}
    ],
    [
    {"key":"ID","value":"456"},
    {"key":"Name","value":"yui"},
    {"key":"Program","value":"gdffgf"},
    {"key":"Type","value":"ghgfjhjhj"},
    {"key":"Section","value":"jkjlkll"},
    {"key":"Director","value":"uiop"},
    {"key":"Project","value":"rtyuui"},
    {"key":"Manager","value":"rfv"},
    {"key":"PCM","value":"ujmk"},
    {"key":"Contractor","value":"rfvtg"},
    {"key":"Client","value":"efgg"}
    ]
]'
)

预期结果：

ID	Name	Program	Type	Section	Director	Project	Manager	PCM	Contractor	Client
123	abc	qew	tyu	dd	ghghjg	hkhjk	fghfgf	gnhghj	gghgh	gghhg
456	yui	gdffgf	ghgf	jkjlkll	uiop	rtyuui	rfv	ujmk	rfvtg	efgg

提前致谢。

任何帮助将不胜感激。

Answer 1

您有双重嵌套的 JSON 数组。

第一层包含一个完整的键/值对数组，代表最终结果中的一行。我们可以使用OPENJSON 来拆分数组，然后APPLY 将它返回到原来的表中。

第二层有包含列名和值的键/值对。我们需要在另一个 APPLY 中旋转它。

SELECT j2.*
FROM TempTable t
CROSS APPLY OPENJSON(t.rawdata) j1
CROSS APPLY (
    SELECT *
    FROM OPENJSON(j1.value)
      WITH (
        [key] varchar(50),
        value varchar(100)
      ) j2
    PIVOT (
        MAX(value) FOR [key] IN (
          ID,Name,Program,[Type],Section,Director,Project,Manager,PCM,Contractor,Client
        )
    ) pvt
) j2

SQL Fiddle