I am storing ids in comma separated string.
e.g
1,2,3,4
How can I store this in JSON in the column and should be able to insert delete any particular value?
Thanks
Part of the following answer comes from here, so all credits go there: https://stackoverflow.com/a/37844117/2695832
Here's a solution that enables you to store your string values in a JSON array in a table column. However, the should be able to insert delete any particular value part of your question is not totally clear to me.
DECLARE #source VARCHAR(20);
SET #source = '1,2,3,4';
DECLARE #values TABLE
(
[Id] VARCHAR(20)
);
INSERT INTO #values
(
[Id]
)
SELECT
value
FROM [STRING_SPLIT](#source, ',')
WHERE RTRIM(value) <> '';
INSERT INTO #values ([Id]) VALUES ('5')
DELETE FROM #values WHERE Id = 2
SELECT
JSON_QUERY('[' + STUFF(( SELECT ',' + '"' + Id + '"'
FROM #values FOR XML PATH('')),1,1,'') + ']' ) ids
FOR JSON PATH , WITHOUT_ARRAY_WRAPPER
This produces the following JSON object:
{"ids":["1","3","4","5"]}
The code might need some tweaking to completely match your needs since you're probably not using a table variable and also maybe want to use a numeric data type for your id values.
Related
We have a base table which has custom column_values column
Table_Structure:
User_Dimension-
Userid,username,addresss,Custom_value
Userid is the primary key and customer can map the fields present in the file using our UI.
If any of the columns present in the files doesn't fit in the column present in our base tables, we will create a custom column and store it in the form of json.
Userid,username,addresss,Custom_value
234,AK4140,BANGLORE,{"Pin:"522413","State":"Maharastra"}
The data will be stored as mentioned in the above in a staging table
Note: for the table User_Dimension there can be data from multiple files so my custom values are different for each file and that information is stored in a meta data table.
We are using SCD Type 1 for dimension tables
The problem is to merge JSON column.
Consider this scenario:
User_Dimension
Userid,username,addresss,Service_Type,User_Type,Custom_value
234,ak4140,banglore,null,null,{"Pin:"522413","State":"Maharastra"}
The above entry was present in my user_dimension from File1
Now I need to push below value to my table from File2
Userid,username,addresss,Service_Type,User_Type,Custom_value
234,NULL,NULL,Customer,DVV,{"Birthdate:"19-09-1995","State":"Karnataka"}
I am merging both the values based on the Userid.
The problem is Custom_Value column. From the above entries I need to update this column as shown here:
Userid,username,addresss,Service_Type,User_Type,Custom_value
234,ak4140,banglore,Customer,DVV,{"Pin:"522413","State":"Karnataka","Birthdate":"19-09-1995"}
I wrote a function which can perhaps be used to merge two json files:
create or alter function dbo.FN_JSON_MERGE(#pJson1 NVARCHAR(MAX), #pJson2 NVARCHAR(MAX))
RETURNS NVARCHAR(MAX)
AS
BEGIN
-- Get keys...
declare #t table ([key] nvarchar(max) collate database_default, [value] nvarchar(max) collate database_default, row_id int identity)
insert into #t
select [key], [value]
from OPENJSON(#pJson1)
-- Merge values from #pjson2
update t
set value = oj.value
from #t t
inner join OPENJSON(#pJson2) oj
ON oj.[key] collate database_default = t.[key] collate database_default
insert into #t
select [key], [value]
from OPENJSON(#pJson2) o
where not exists(
select 1
from #t t2
where t2.[key] collate database_default = o.[key] collate database_default
)
-- Finally generate new json...
set #pJson2 = ''
select #pJson2 = #pJson2 + ',' + '"' + [key] + '": "' + (value) + '"'
from #t
order by [row_id]
return '{' + stuff(#pJson2, 1, 1, '') + '}'
END
Test code:
select dbo.FN_JSON_MERGE('{"Pin":"522413","State":"Maharastra"}'
, '{"Birthdate":"19-09-1995","State":"Karnataka"}')
-- returns {"Pin": "522413","State": "Karnataka","Birthdate": "19-09-1995"}
But there are lot of BUTs. It might not handle very long strings / strings with quotes or other more weird jsons etc.
Also, it doesn't always keep the same attribute order as original json.
It's likely to be very slow.
Finally, it doesn't handle if you want to merge data from 3 files.
Right now, the second argument values always overwrite first.
But maybe it can be of some use. You can always create a procedure which does this for better performance.
Given the following test data:
declare #mg nvarchar(max);
set #mg = '{"fiskepind":["ko","hest","gris"]}';
select #mg, JSON_VALUE(#mg,'$.fiskepind')
How do i get returned a column with:
ko,hest,gris
Example returns: NULL, and i dont want to [index] to only get one returned.
Starting from SQL Server 2017, a possible solution is a combination of OPENJSON() and STRING_AGG().
SELECT STRING_AGG([value], ',') WITHIN GROUP (ORDER BY CONVERT(int, [key])) AS Result
FROM OPENJSON(#mg, '$.fiskepind')
Note, that JSON_VALUE() returns a scalar value, so the NULL value is the expected result when you try to extract a JSON array ('$.fiskepind') from the input JSON text.
If you just want a combine list, you can use OPENJSON to get a table and then use FOR XML PATH or STRING_AGG to combine into a single string.
declare #mg nvarchar(max);
set #mg = '{"fiskepind":["ko","hest","gris"]}';
select #mg, JSON_VALUE(#mg,'$.fiskepind')
, STUFF((
SELECT
',' + value
FROM OPENJSON(#mg, '$.fiskepind')
FOR XML PATH('')
),1,1,'') as combined_list
There is a JSON column in SQL Server tables with data like:
["1","2","3","4"]
and I want to delete "3" or ("2","4") (for example) from it.
Can I do it with Json_Modify or anything else?
JSON modify can modify by PATH if you have not any key to modify and just a simple list like that you can do this:
DECLARE #JsonList NVARCHAR(1000) = N'["1","2","3","4"]';
DECLARE #NewList NVARCHAR(1000);
SET #NewList =
(
SELECT CONCAT('[', STRING_AGG(CONCAT('"', oj.Value, '"'), ','), ']')
FROM OPENJSON(#JsonList) AS oj
WHERE oj.Value NOT IN ( 2, 4 )
);
PRINT #NewList
I have a table with an VARCHAR(MAX) column which stores JSON key value pairs.
The JSON document schema is simply a different number of key value pairs, no nesting, nor arrays in there.
I wish to build a query, which gives back the JSON in a tabular format,
which is easy with the named elements (see WITH clause below):
DECLARE #MYJSONTABLE TABLE (ID INT IDENTITY NOT NULL PRIMARY KEY, MYDATA NVARCHAR(max) null)
INSERT INTO #MYJSONTABLE
(
MYDATA
)
VALUES
(N'{"id": 2, "info": "some info", "age": 25}'),
(N'{"id": 5, "info": "other info", "dob": "2005-11-04T12:00:00"}')
SELECT p.ID,MYDATA.*
FROM #MYJSONTABLE p
CROSS APPLY
OPENJSON(p.MYDATA)
WITH (
id INT 'strict $.id',
info NVARCHAR(50) '$.info',
age INT,
dateOfBirth DATETIME2 '$.dob'
) AS MYDATA
While the output is exactly what I want,
my issue with the above solution, that I don't know the key names in the JSON document neither, and how many are there, but still wish to return them all in the same tabular format.
If I omit the WITH clause above, the query do return all key value pairs, but the output goes "vertical" and each key in the JSON generates a new row.
Could the above query be modified to be dynamic, and return all key value pairs without explicitly specifying the JSON key names?
Perhaps something like this will work for you.
This uses a CTE to get the DISTINCT key's from your JSON. Then string aggregation to create a dynamic statement, which you can see from the PRINT statement.
Note that for your sample data, the column dob is not returned because it is outside of the initial JSON defined. If the first right brace (}) is removed, the column appears.
DECLARE #SQL nvarchar(MAX),
#CRLF nchar(2) = NCHAR(13) + NCHAR(10);
DECLARE #Delimiter nvarchar(50) = N',' + #CRLF + N' ';
WITH Keys AS(
SELECT DISTINCT J.[key]
FROM dbo.YourTable YT
CROSS APPLY OPENJSON(YT.JsonColumn) J)
SELECT #SQL = N'SELECT YT.ID,' + #CRLF +
N' J.*' + #CRLF +
N'FROM dbo.YourTable YT' + #CRLF +
N' CROSS APPLY OPENJSON(YT.JsonColumn)' + #CRLF +
N' WITH(' +
STRING_AGG(QUOTENAME(K.[key]) + N' nvarchar(100)', #Delimiter) + N') J;'
FROM Keys K;
PRINT #SQL;
EXEC sys.sp_executesql #SQL;
Note, this will not work with a table variable, unless you create a table type and then pass the TYPE as a parameter to sys.sp_executesql. This is why the above assumes a real table.
I have a json array in my table. It contains an array. I can create, append or make my array NULL. Inside my stored procedure but I don't see any way to pop value from array. Apparently JSON_Modify may have solution as you can update key as well as Single value but how can I use it to modify my array?
--My Array
Declare #json = '{"array":[123,456]}'
Desired results after update:
'{"array":[123]}'
Please note that array contain int values. Which are my sub department id. All values are (supposed to be) unique.
You could use:
DECLARE #json NVARCHAR(MAX) = '{"array":[123,456]}';
WITH cte AS (
SELECT *, MAX([key]) OVER() AS m_key
FROM OPENJSON(#json, '$.array') s
)
SELECT JSON_QUERY('[' + IIF(MAX(m_key) = 0, '', STRING_AGG(value,',')
WITHIN GROUP (ORDER BY [key])) + ']','$') AS array
FROM cte
WHERE [key] != m_key OR m_key = 0
FOR JSON AUTO, WITHOUT_ARRAY_WRAPPER;
Output:
{"array":[123]}
DBFiddle Demo SQL Server 2017
As I was in hurry I solved my problem following way, but I would really recommend not to use it. Please see answer above by #lad2025.
DECLARE #json VARCHAR(MAX)
=(SELECT jsonDept
FROM tblEmployee
WHERE tblEmployeeID = #empid)
DECLARE #newjson VARCHAR(MAX)= (
SELECT LEFT(subdept, LEN(subdept)-1)
FROM (
SELECT Distinct value + ', ' FROM OPENJSON(#json,'$.array') Where value <> #subdeptid
FOR XML PATH ('')
) t (subdept))
UPDATE tblEmployee SET jsonDept = '{"array":['+ #newjson +']}' WHERE tblEmployeeID = #empid