Solved

When passing parameters to MS SQL Server Stored Procs, do we send values or pointers?

Posted on 2006-06-27
4
206 Views
Last Modified: 2012-05-05
A theoretical question, having spotted an inconsistency while reviewing someone's code:

If I pass a Smallint variable to a stored procedure as a parameter, and the parameter is defined in the stored procedure as an Interger, can this cause problems?

I suspect that an implicit conversion is done for me, but it occurred to me that if SQL handles this by passing a pointer to the variable (as when passing variables using "ByRef" in Visual Basic), the stored procedure could decide to pick up the four bytes following the pointer and end up with the wrong value in the parameter.

Thanks for taking the time to read this.

0
Comment
Question by:johnhyde
  • 2
  • 2
4 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 16993186
> can this cause problems?
yes it can, if the parameter is of type OUTPUT and a value larger than smallint is returned.

regarding the value passed into the proc, there is no issue
0
 

Author Comment

by:johnhyde
ID: 16993634
Thanks for this, angelIII.

Certaily no argument regarding OUTPUT parameters.  So is it the case that values, rather than pointers are passed, and SQL Server implicitly converts where necessary?
0
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 125 total points
ID: 16993739
yes
0
 

Author Comment

by:johnhyde
ID: 16994030
That's what I wanted to know - many thanks for the speedy response.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Powershell v3 - SQLCMD 3 27
TSQL convert date to string 4 35
AD and SQL Server 2016 2 29
What is this datetime? 1 19
Introduction SQL Server Integration Services can read XML files, that’s known by every BI developer.  (If you didn’t, don’t worry, I’m aiming this article at newcomers as well.) But how far can you go?  When does the XML Source component become …
For both online and offline retail, the cross-channel business is the most recent pattern in the B2C trade space.
Via a live example combined with referencing Books Online, show some of the information that can be extracted from the Catalog Views in SQL Server.
Using examples as well as descriptions, and references to Books Online, show the different Recovery Models available in SQL Server and explain, as well as show how full, differential and transaction log backups are performed

860 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question