ISSCommandWithParameters::GetParameterProperties (OLE DB)
Returns an array of SSPARAMPROPS property set structures, one SSPARAMPROPS property set for each UDT or XML parameter.
语法
HRESULT GetParameterProperties(
DB_UPARAMS *pcParams,
SSPARAMPROPS **prgParamProperties);
Arguments
- pcParams[out][in]
A pointer to memory that contains the number of SSPARAMPROPS structures returned in prgParamProperties.
- prgParamProperties[out]
A pointer to memory in which an array of SSPARAMPROPS structures is returned. The provider allocates memory for the structures and returns the address to this memory; the consumer releases this memory with IMalloc::Free when it no longer needs the structures. Before calling IMalloc::Free for prgParamProperties, the consumer must also call VariantClear for the vValue property of each DBPROP structure in order to prevent a memory leak in cases where the variant contains a reference type (such as a BSTR.) If pcParams is zero on output or an error other than DB_E_ERRORSOCCURRED occurs, the provider does not allocate any memory and ensures that prgParamProperties is a null pointer on output.
Return Code Values
The GetParameterProperties method returns the same error codes as the core OLE DB ICommandProperties::GetProperties method, except that DB_S_ERRORSOCCURRED and DB_E_ERRORSOCCURED cannot be raised.
备注
ISSCommandWithParameters::GetParameterProperties behaves consistently with respect to GetParameterInfo. If ISSCommandWithParameters::SetParameterProperties or SetParameterInfo have not been called or have been called with cParams equal to zero, GetParameterInfo derives parameter information and returns this. If ISSCommandWithParameters::SetParameterProperties or SetParameterInfo have been called for at least one parameter, ISSCommandWithParameters::GetParameterProperties returns properties only for those parameters for which ISSCommandWithParameters::SetParameterProperties has been called. If ISSCommandWithParameters::SetParameterProperties is called after ISSCommandWithParameters::GetParameterProperties or GetParameterInfo, subsequent calls to ISSCommandWithParameters::GetParameterProperties return the overridden values for those parameters for which ISSCommandWithParameters::SetParameterProperties has been called.
The SSPARAMPROPS structure is defined as follows:
struct SSPARAMPROPS {
DBORDINAL iOrdinal;
ULONG cPropertySets;
DBPROPSET *rgPropertySets;
};
| Member | Description |
|---|---|
iOrdinal |
The ordinal of the passed parameter. |
cPropertySets |
The number of DBPROPSET structures in rgPropertySets. |
rgPropertySets |
A pointer to memory in which to return an array of DBPROPSET structures. |
请参阅
参考
ISSCommandWithParameters (OLE DB)