How to run the query stored as a value in a row using Stored procedure for some condition - sql

Question

I have one table with 3 columns. One column captures the case no., one column captures all the DML (Insert / Update /Delete) query date wise for the specific case and one column captures the respective date and time at which the DML was performed. Now the row can repeat for a single case as it captures any DML performed for that case.
My requirement is that I have to write a procedure with Case No. and / or Date Time as a input parameter and after executing the procedure it must take all the DML query till the specific date and executes it as normal DML query.
Below is the sample table for the same:
For above case 1, I want to run all the dml statement for any specific date. Please help in this case.

Answer 1

Given the following schema and records:
create table caseLog
(
CaseID INT,
Query NVARCHAR(MAX),
[Date] DATETIME
);
CREATE TABLE Cases
(ID INT, Name NVARCHAR(50))
INSERT INTO caseLog (CaseID, Query, [Date])
VALUES
(1, 'INSERT INTO Cases (ID, Name) VALUES (1, ''First Name'')', '2019-04-02 15:00'),
(1, 'UPDATE Cases SET Name = ''Second Name'' WHERE ID = 1', '2019-04-02 16:00'),
(1, 'UPDATE Cases SET Name = ''Third Name'' WHERE ID = 1', '2019-04-02 17:00');
The procedure could look something like this:
CREATE PROCEDURE executeCaseLog
#CaseID INT,
#Until DATETIME
AS
DECLARE
#Query NVARCHAR(MAX) = '';
BEGIN
SELECT #Query += CONCAT(caseLog.Query, ';', CHAR(13), CHAR(10))
FROM caseLog
WHERE caseID = #CaseID
AND [Date] <= #Until
-- For showcase purposes
PRINT #Query
EXEC sp_executesql #Query
END;
GO
Now, if executed like so:
EXEC executeCaseLog #CaseID = 1, #Until = '2019-04-02 16:30'
It will yield the following:
SELECT * FROM Cases
ID Name
----------- --------------------------------------------------
1 Second Name
(1 row affected)