如何在ASP中使用可选参数将参数名称传递到存储过程中

Question

I am using a classic ASP application and the ADODB.Recordset and SQL Server.

When I am using a stored procedure:

command.Parameters.Append command.CreateParameter name:="name", value:="value"

size and direction too

the stored procedure I am using has an optional parameter.

So I only pass the param I need (the 3th and the 8th param only in this case)

I am getting an error, when I look with SQL Server profiler, I can see that the param has been passed without the param name (only the value)

And that the cause to the error

What am I doing wrong?

Thanks

Answer 1

You need to set the command's property NamedParameters = True and prepend @ character to each parameter's name. Taken from the official documentation :

When this property is true, ADO passes the value of the Name property of each parameter in the Parameter collection for the Command Object. The provider uses a parameter name to match parameters in the CommandText or CommandStream properties. If this property is false (the default), parameter names are ignored and the provider uses the order of parameters to match values to parameters in the CommandText or CommandStream properties

Answer 2

This problem occurs because of the way you are building the parameters, you must declare all parameters and append them to the parameters collection regardless of whether they will be executed.

With command
    'Declare all the parameters required or not in the order they 
    'should be applied and append them to the Parameters Collection.
    .Parameters.Append(.CreateParameter("name1", adVarWChar, adParamInput, 50))
    .Parameters.Append(.CreateParameter("name2", adVarWChar, adParamInput, 50))
    .Parameters.Append(.CreateParameter("name3", adVarWChar, adParamInput, 50))
    .Parameters.Append(.CreateParameter("name4", adVarWChar, adParamInput, 50))

    'Only define values for parameters you wish to pass.
    'In this case only "name2" and "name4" parameters are passed.
    .Parameters("name2").Value = "My Name 2 Value"
    .Parameters("name4").Value = "My Name 4 Value"
End With