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  SQL Server Tips by Gama and Naughter

Named parameters

All the examples already described have the parameters passed in the same order as they appear when calling the XP. That is called passing parameters by location but it is also possible to pass parameters by name.

One detail about ODS is that it keeps track of parameters by their ordinal position but it does not mean that named parameters are not possible. The ordinal position for each parameter is fixed and instead it can be retrieved from the parameterís name using srv_paramnumber. Instead of using hard coded numbers for each parameter, variables will store the parameterís ordinal.

Validating the input has a new step, after verifying the number of parameters entered, the parameter names are used in the ODS function srv_paramnumber, trying to locate their position. If a parameter name is not found its position is zero; in this particular code, all parameters are compulsory and an error message is generated if one or more are missing. The positions are stored in variables that will provide access to the parameters.


The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm  

 

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