EXEC sp_executesql with a datetime parameter? - sql

Question

I'm using EXEC sp_executesql for a dynamic query in SQL Server 2016, and am stumbling on when a user wants to pass in a year. I have a datetime field called tkemdate and it is stored as a datetime field in SQL.
Although SQL stores it as datetime, the user only passes in a year parameter (2020, 2019, 2018, etc). How do I get the query accept just the year?
Here's my stored procedure, with the datetime param.
(
#tkemdate datetime
)
AS
BEGIN
Declare #SQL NVARCHAR(MAX)
Set #SQL = 'SELECT timekeep.tkinit, timekeep.tkfirst, timekeep.tklast,
year(timekeep.tkemdate) as tkemdate
FROM abc123.timekeep'
WHERE 1 = 1
IF #tkemdate IS NOT NULL
Select #SQL = #SQL + 'AND ([tkemdate] = #tkemdate)'
EXEC sp_executesql #SQL, N'#tkemdate datetime', #tkemdate
END

Answer 1

You can use something like this:
IF #year IS NOT NULL
Select #SQL = #SQL + ' AND (YEAR([tkemdate]) = #year)'
EXEC sp_executesql #SQL, N'#year int', #year=#year;
It is not clear where #year comes from, but you say that the user is passing in the year.
If you only want to use the year from #tkemdate then:
IF #tkemdate IS NOT NULL
Select #SQL = #SQL + ' AND (YEAR([tkemdate]) = YEAR(#tkemdate))';
EXEC sp_executesql #SQL, N'##tkemdate datetime', ##tkemdate=##tkemdate;

Answer 2

It could be also something like that - where Your procedure has an integer parameter representing year.
We could also add some validation to it, for example if #year is less than 1000 or greater than 2500.
CREATE PROCEDURE abc123.get_timekeep_records (
#year int
)
AS
BEGIN
SET NOCOUNT ON; -- I usually add this because of a PHP driver
DECLARE #SQL NVARCHAR(MAX)
SET #SQL = 'SELECT timekeep.tkinit, timekeep.tkfirst, timekeep.tklast,
YEAR(timekeep.tkemdate) as [tkemdate]
FROM abc123.timekeep
WHERE 1 = 1 '
-- Validation
IF #year < 1000 OR #year > 2500
RAISERROR('Invalid year: %i', 16, 1, #year)
IF #year IS NOT NULL
SELECT #SQL = #SQL + 'AND (YEAR(timekeep.tkemdate) = #year)'
EXEC sp_executesql #SQL, N'#year int', #year;
END