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

Posted on 2006-06-27
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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.

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Question by:johnhyde
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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
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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?
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Guy Hengel [angelIII / a3] earned 500 total points
ID: 16993739
yes
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by:johnhyde
ID: 16994030
That's what I wanted to know - many thanks for the speedy response.
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