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  SQL Server Tips by Gama and Naughter

Parameter Management

srv_rpcparams

This returns the number of parameters passed to your XP.

srv_paramname

This function is used to get the name of a parameter, which is passed, by name. Parameters to an XP can be passed by name or by position and you cannot mix the two at the same time. Passing a parameter by name is useful, when your XP can be called with a lot of parameters but most of the time default values can be used for the less used ones. Normally when your XP has only a few parameters you would pass then by position and would have no use for “srv_paramname”. Parameter indexes start at 1 so your code should be careful when you use C based indices which start at 0.

srv_paramnumber

This is the corollary to the function srv_parname. It returns the index of a parameter given the parameter name. Again this function is only useful if the XP will pass it parameters by name.

srv_paraminfo

This function returns information about a specific parameter. Information returned includes its ODS data type, Maximum Length, Actual Length, the data for the parameter and whether it is a null flag.

srv_paramstatus

This function returns a value, which represents the “status” of a parameter. Currently only one status flag is defined. This is whether the parameter is a return parameter (i.e. defined in TSQL using “OUTPUT”)

srv_paramsetoutput

This function allows the actual value of an OUTPUT parameter to be set from your XP.


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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