Passing a Table to a Stored Procedure
Published: 25th January 2015
This is a direct follow on from my previous post really as one of the most common uses for the Table Type is that you can use it (in SQL Server 2008 onwards) to pass a table as a parameter into a Stored Procedure. This is incredibly useful as one of the things that I see most often asked on the internet is how to pass tabular data to a stored procedure.

People come up with all manner of solutions for this from global temp tables or comma separated lists to XML, but this is by far the easiest in my opinion.

Let’s just use a very basic example to show the technique…

Firstly we’ll create a table type:

if exists
select name
from sys.table_types
where name = 'demoType'
       drop type

create type
demoType as table
id int identity,
myDate smalldatetime,
myValue smallint,
myOtherValue decimal(10, 2)

Okay, now let’s create a (somewhat pointless) procedure which accepts the table type as a parameter:

if object_id('testProc') is not null drop procedure testProc

create procedure testProc
@tableParam demoType readonly
@myTable demoType
insert into @myTable
select myDate, myValue, myOtherValue
from @tableParam

update @myTable
set myDate = dateadd(n, myValue, myDate)

update @myTable
set myOtherValue = (myValue * 2.00) / datepart(n, mydate)

select *
from @myTable
order by id

The one thing to note here is that if you pass a table into a stored procedure as a parameter then the table MUST be read only and therefore you cannot edit it.

Therefore, because I’m editing the data in my proc, I have simply declared a new table using the table type, loaded it with data, and then edited and returned that.

Finally we’ll call the procedure and see that it returns as expected:

declare @newTable demoType

insert into @newTable
values(current_timestamp, 1, 0),
current_timestamp, 12, 0),
current_timestamp, 34, 0),
current_timestamp, 2, 0),
current_timestamp, 45, 0)

exec testProc @newTable

And there you are… you’ve passed tabular data to a stored proc using a table type. Simples.
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