TParamType and TParamTypes represent the use of parameters on datasets that represent queries or stored procedures.
TParamType = ( ptUnknown, ptInput, ptOutput, ptInputOutput, ptResult );
enum TParamType { ptUnknown, ptInput, ptOutput, ptInputOutput, ptResult };
TParamType indicates how a query or stored procedure parameter is used. TParamTypes is a set of parameter types that can be used to filter parameters so that an application need only work with those parameters that are of interest.
The DbClient unit defines a constant, AllParamTypes, of type TParamTypes that represents any possible parameter type:
const AllParamTypes = [ptUnknown, ptInput, ptOutput, ptInputOutput, ptResult];
#define AllParamTypes TParamTypes() << ptUnknown << ptInput << ptOutput << ptInputOutput << ptResult )
TParamType includes the following values:
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Value |
Description |
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ptUnknown |
Unknown or undetermined. Before executing a stored procedure, the application must set parameters of this type to another kind. |
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ptInput |
Used to input a field value. Identifies a parameter used to pass values to a query or stored procedure for processing. |
|
ptOutput |
Used to output a field value. Identifies a parameter used by a stored procedure to return values to an application. |
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ptInputOutput |
Used for both input and output. |
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ptResult |
Used as a return value. Identifies a parameter used by a stored procedure to return an error or status value. A stored procedure can only have one parameter of type ptResult. |
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