I'm creating an update statement that generate SHA256 for table columns based on table's name
1st Step: I created a procedure that get the table columns, concatenate it all in one columns, then format to a desired format.
-- Procedure code : Extract table's columns list, concatenate it and format it
Create procedure SHA_PREP (in inp1 nvarchar(20))
as
begin
SELECT concat(concat('hash_sha256(',STRING_AGG(A, ', ')),')') AS Names
FROM (
SELECT concat('to_varbinary(IFNULL("',concat(COLUMN_NAME,'",''0''))')) as A
FROM SYS.TABLE_COLUMNS
WHERE SCHEMA_NAME = 'SCHEMA_NAME' AND TABLE_NAME = :inp1
AND COLUMN_NAME not in ('SHA')
ORDER BY POSITION
);
end;
/* Result of this procedures :
hash_sha256(
to_varbinary("ID"),to_varbinary(IFNULL("COL1",'0')),to_varbinary(IFNULL("COL2",'0')) )
*/
-- Update Statement needed
UPDATE "SCHEMA_NAME"."TABLE_NAME"
SET "SHA" = CALL "SCHEMA_NAME"."SHA_PREP"('SCHEMA_NAME')
WHERE "ID" = 99 -- a random filter
I find a solution that suits my need, but maybe there's other easier or more suitable approchaes :
I added the update statement to my procedure, and inserted all the generated query into a temporary table column, the excuted it using EXECUTE IMMEDIATE
Create procedure SHA_PREP (in inp1 nvarchar(20))
as
begin
/* ********************************************************** */
DECLARE SQL_STR VARCHAR(5000);
-- Create a temporary table to store a query in
create local temporary table #temp1 (QUERY varchar(5000));
-- Insert the desirable query into the QUERY column (Temp Table)
insert into #temp1(QUERY)
SELECT concat('UPDATE "SCHEMA_NAME"."TABLE_NAME" SET "SHA" =' ,concat(concat('hash_sha256(',STRING_AGG(A, ', ')),')'))
FROM (
SELECT concat('to_varbinary(IFNULL("',concat(COLUMN_NAME,'",''0''))')) as A
FROM SYS.TABLE_COLUMNS
WHERE SCHEMA_NAME = 'SCHEMA_NAME' AND TABLE_NAME = :inp1
AND COLUMN_NAME not in ('SHA')
ORDER BY POSITION
);
end;
/* QUERY : UPDATE "SCHEMA_NAME"."TABLE_NAME" SET "SHA" =
hash_sha256(to_varbinary("ID"),to_varbinary(IFNULL("COL1",'0')),to_varbinary(IFNULL("COL2",'0'))) */
SELECT QUERY into SQL_STR FROM "SCHEMA_NAME".#temp1;
--Excuting the query
EXECUTE IMMEDIATE (:SQL_STR);
-- Dropping the temporary table
DROP TABLE "SCHEMA_NAME".#temp1;
/* ********************************************************** */
end;
Any other solution or improvement are well welcomed Thank you