我试图解析SQL Server 2017中的表中的JSON数据。我有一个返回此数据的视图：
| Debrief Name | Version | Answer Question | Answer Options |
+-------------------+-----------+--------------------------+--------------------------------------------------------------------------------------------------------------------------+
| Observer Report | 7 | Division: | {"Options":[{"Display":"Domestic","Value":"Domestic"},{"Display":"International","Value":"International"}]} |
| Observer Report | 7 | Are you on reserve? | {"Options":[{"Display":"Yes - Long Call Line","Value":"Yes"},{"Display":"No","Value":"No"}]} |
| Observer Report | 11 | Crew Position: | {"Options":[{"Display":"CA","Value":"CA"},{"Display":"RC","Value":"RC"},{"Display":"FO","Value":"FO"}]} |
| Observer Report | 11 | Domicile: | {"VisibleLines":2,"Options":[{"Display":"BOS","Value":"BOS"},{"Display":"CLT","Value":"CLT"}]} |
| Training Debrief | 12 | TRAINING CREW POSITION | {"VisibleLines":2,"Options":[{"Display":"CA","Value":"CA"},{"Display":"FO","Value":"FO"}]} |
| Training Debrief | 12 | AIRCRAFT | {"VisibleLines":2,"Options":[{"Display":"777","Value":"777"},{"Display":"767","Value":"767"}]} |
| Security Debrief | 9 | Aircraft Type | {"Options":[{"Display":"MD-80","Value":"MD-80"},{"Display":"777","Value":"777"},{"Display":"767/757","Value":"767/757"}]}|
| News Digest | 2 | Do you read Digest? | {"Options":[{"Display":"Yes","Value":"Yes"},{"Display":"No","Value":"No"}]} |
Debrief Name列可以有相同汇报名称和Version的多个记录。每个汇报也有多个版本。对于每个汇报名称和版本组合，有一组Answer Questions和相关的Answer Options。现在列Answer Options包含我需要解析的JSON记录。
所以我的初始查询如下所示：
SELECT *
FROM [dbo].<MY VIEW>
WHERE [Debrief Name] = 'Observer Report' AND Version = 11
将返回以下数据：
| Debrief Name | Version | Answer Question | Answer Options |
+---------------------+--------------+-----------------------+-----------------------------------------------------------------------------------------------------------------+
| Observer Report | 11 | Crew Position: | {"Options":[{"Display":"CA","Value":"CA"},{"Display":"RC","Value":"RC"}]} |
| Observer Report | 11 | Domicile: | {"VisibleLines":2,"Options":[{"Display":"BOS","Value":"BOS"},{"Display":"CLT","Value":"CLT"}]} |
| Observer Report | 11 | Fleet: | {"Options":[{"Display":"330","Value":"330"},{"Display":"320","Value":"320"}]} |
| Observer Report | 11 | Division: | {"Options":[{"Display":"Domestic","Value":"Domestic"},{"Display":"International","Value":"International"}]} |
| Observer Report | 11 | Are you on reserve? | {"Options":[{"Display":"Yes - Long Call Line","Value":"Yes - Long Call Line"},{"Display":"No","Value":"No"}]} |
现在从这个返回的结果，对于每个Answer Question，我需要解析相关的Answer Options JSON数据并提取所有display属性的Value字段。因此，例如Answer Options中的JSON字符串，问题是“你在保留吗？”看起来像这样：
"Options":[
{
"Display":"330",
"Value":"330",
"Selected":false
},
{
"Display":"320",
"Value":"320",
"Selected":false
},
{
"Display":"S80",
"Value":"S80",
"Selected":false
}
]
所以我需要提取“值”字段并返回类似值为{330,320,195}的数组。
总之，我想构建一个查询，当我提供Debrief Name和VersionNumber时，它返回Answer Question和所有Answer Option值。
我正在考虑使用如下的存储过程：
CREATE PROCEDURE myProc
@DebriefName NVARCHAR(255),
@Version INT
AS
SELECT *
FROM [dbo].[myView]
WHERE [Debrief Name] = @DebriefName
AND Version = @Version
GO;
然后有另一个存储过程将从myProc捕获此结果，然后执行JSON解析：
CREATE PROCEDURE parseJSON
@DebriefName NVARCHAR(255),
@Version INT
AS
EXEC myProc @DebriefName, @Version; //Need to capture the result data in a temp table or something
// Parse the JSON data for each question item in temp table
GO;
我不是SQL专家所以不知道如何做到这一点。我在SQL here中阅读了Json解析，感觉我可以使用它，但不知道如何在我的上下文中。
如果要解析Answer Options列中的JSON数据并提取Value字段，可以尝试使用以下方法，使用OPENJSON()和STRING_AGG()：
DECLARE @json nvarchar(max)
SET @json = N'{
"Options": [
{
"Display": "330",
"Value": "330",
"Selected": false
},
{
"Display": "320",
"Value": "320",
"Selected": false
},
{
"Display": "195",
"Value": "195",
"Selected": false
}
]
}'
SELECT STRING_AGG(x.[value], ', ') AS [Values]
FROM OPENJSON(@json, '$.Options') j
CROSS APPLY (SELECT * FROM OPENJSON(j.[value])) x
WHERE x.[key] = 'Value'
输出：
Values
330, 320, 195
如果要使用存储过程构建语句，请使用以下方法：
CREATE TABLE myTable (
DebriefName nvarchar(100),
Version int,
AnswerQuestion nvarchar(1000),
AnswerOptions nvarchar(max)
)
INSERT INTO myTable
(DebriefName, Version, AnswerQuestion, AnswerOptions)
VALUES
(N'Observer Report', 7, N'Division:' , N'{"Options":[{"Display":"Domestic","Value":"Domestic"},{"Display":"International","Value":"International"}]}'),
(N'Observer Report', 7, N'Are you on reserve?' , N'{"Options":[{"Display":"Yes - Long Call Line","Value":"Yes"},{"Display":"No","Value":"No"}]}'),
(N'Observer Report', 11, N'Crew Position:' , N'{"Options":[{"Display":"CA","Value":"CA"},{"Display":"RC","Value":"RC"},{"Display":"FO","Value":"FO"}]}'),
(N'Observer Report', 11, N'Domicile:' , N'{"VisibleLines":2,"Options":[{"Display":"BOS","Value":"BOS"},{"Display":"CLT","Value":"CLT"}]}'),
(N'Training Debrief', 12, N'TRAINING CREW POSITION', N'{"VisibleLines":2,"Options":[{"Display":"CA","Value":"CA"},{"Display":"FO","Value":"FO"}]}'),
(N'Training Debrief', 12, N'AIRCRAFT' , N'{"VisibleLines":2,"Options":[{"Display":"777","Value":"777"},{"Display":"767","Value":"767"}]}'),
(N'Security Debrief', 9, N'Aircraft Type' , N'{"Options":[{"Display":"MD-80","Value":"MD-80"},{"Display":"777","Value":"777"},{"Display":"767/757","Value":"767/757"}]}'),
(N'News Digest', 2, N'Do you read Digest?' , N'{"Options":[{"Display":"Yes","Value":"Yes"},{"Display":"No","Value":"No"}]}')
SELECT
t.AnswerQuestion,
STRING_AGG(x.[value], ', ') AS [Values]
FROM myTable t
CROSS APPLY (SELECT * FROM OPENJSON(t.AnswerOptions, '$.Options')) j
CROSS APPLY (SELECT * FROM OPENJSON(j.[value])) x
WHERE
DebriefName = N'Observer Report' AND
t.Version = 11 AND
x.[key] = 'Value'
GROUP BY
t.DebriefName,
t.Version,
t.AnswerQuestion
输出：
AnswerQuestion Values
Crew Position: CA, RC, FO
Domicile: BOS, CLT