How to run CRUD in single procedure by using json?(T-SQL) - json

Question

Procedure
ALTER PROCEDURE [dbo].[SpProductTsk]
(#json varchar(MAX))
AS
----insert---
BEGIN
DECLARE #SelectedProcedure varchar(max) = ''
IF #SelectedProcedure = 'SpProductIns'
BEGIN
INSERT INTO [dbo].[Product](ProductName, ProductCategory, InsertPersonId, InsertDate)
SELECT
p.productName, p.productCategory,
p.insertPersonId, GETDATE()
FROM
OPENJSON(#json)
WITH
(productName varchar(50) '$.ProductName',
productCategory varchar(50) '$.ProductCategory',
insertPersonId int '$.InsertPersonId',
insertDate datetime '$.InsertDate') AS p
----SELECT-----
IF #SelectedProcedure = 'SpProductSelect'
BEGIN
SELET p.productName, p.productCategory
FROM [dbo].[Product] AS p
FOR JSON PATH, ROOT('ProductDetails')
END
-----UPDATE-----
IF #SelectedProcedure = 'SpProductUpd'
BEGIN
DECLARE #ProductId int,
#ProductName varchar(50),
#ProductCategory varchar(50),
#InsertPersonId int
SELECT
#ProductId = p.productId,
#ProductName = p.productName,
#ProductCategory = p.productCategory,
#InsertPersonId = p.insertPersonId
FROM
OPENJSON (#Json)
WITH
(productId int '$.ProductId',
productName varchar(50) '$.ProductName',
productCategory varchar(50) '$.ProductCategory',
insertPersonId int '$.InsertPersonId') AS p
UPDATE [dbo].[Product]
SET productName = #ProductName,
productCategory = #ProductCategory,
insertPersonId = #InsertPersonId
WHERE ProductId = #ProductId
END
----Delete---
IF #SelectedProcedure = 'SpProductDel'
BEGIN
DECLARE #Id int
SELECT #Id = p.productId
FROM OPENJSON(#json)
WITH (productId int '$.ProductId') AS p
DELETE FROM [dbo].[Product]
WHERE ProductId = #Id
END
END
END
EXEC [dbo].[SpProductTsk] #json = '{
"SelectedProcedur":"SpProductIn",
"ProductName":"Mutton",
"ProductCategory":"Meat",
"InsertPersonId":"1",
"InsertDate":"" }'
SELECT * FROM product
Code compiles but shows 0 rows inserted

Answer 1

You would need to get the "SelectedProcedur" value from the json you pass into the stored procedure.
After to declare #SelectedProcedure set it to the "SelectedProcedur" value from the json you pass in.
DECLARE #SelectedProcedure VARCHAR(MAX) = '';
SET #SelectedProcedure = (
SELECT [value]
FROM [OPENJSON](#json)
WHERE [key] = 'SelectedProcedur'
);
You'll need to fix your if statements as well. All your code is inside the "IF #SelectedProcedure = 'SpProductIns'" block so none of the other if statements would ever get executed.
Before the line
----SELECT-----
add
END
and then remove one of the END at the bottom.