stored procudure variaibles in mysql - mysql

Question

I am declaring variables inside the procedure and setting those values to result from another query.when executed it is giving null.
version:8.0.16
call putrequest('x',"jiraUPM","ASE-12345","inprogress","testcybsjira.com");
requestId and reqid are not null.but it taking null value .
create procedure `putrequest`(in `employeeId` varchar(15),in `reqtype`
varchar(15),in `ticketId` varchar(15),in `status` varchar(15),in `details`
varchar(100))
begin
declare `rid` int;
declare `reqType` int;
select `requestId` into `reqType` from `requesttype` where `request`=`reqtype`;
select `reqId` into `rid` from `employee` where `empId`=`employeeId`;
insert into `requests` values(rid,reqType,`ticketId`,NOW(),NOW(),`status`,`details`);
end
Error executing SQL statement. Column 'reqId' cannot be null - Connection: Connection 1: 93ms

Answer 1

If either of the SELECT queries doens't find a matching row, the corresponding variable will be NULL, and you'll get an error when you try to insert it. You need to check for that before doing the INSERT.
But there's no need for separate SELECT queries and variables, use INSERT INTO ... SELECT ...
INSERT INTO requests
SELECT e.reqId, r.requestId, ticketId, NOW(), NOW(), status, details
FROM requesttype AS r
CROSS JOIN employee AS e
WHERE r.request = reqtype
AND e.empId = employeeId
If reqtype or employeeId can't be found, the join won't return any rows, so nothing will be inserted.

Answer 2

It creates a problem because of the same variable name "reqtype" (declare as a procedure parameter) and "reqType" (Declare as procedure variable)
It considers the null value for reqtype and not return any record.
MySQL is case insensitive . Be careful while given variable name.
DELIMITER $$
create procedure `putrequest`(in `employeeId` varchar(50),in `rtype`
varchar(50),in `ticketId` varchar(15),in `status` varchar(15),in `details`
varchar(100))
begin
declare `rid` int;
declare `reqType` int;
select `reqId` into `rid` from `employee` where `empId`=`employeeId`;
select `requestId` into `reqType` from requesttype where `request`=`rtype`;
insert into `requests` values(rid,reqType,`ticketId`,NOW(),NOW(),`status`,`details`);
end$$
DELIMITER ;
DEMO