IConditionFactory2::CreateNegation method (structuredquery.h)
Creates a condition node that is a logical negation (NOT) of another condition (a subnode of this node).
Syntax
HRESULT CreateNegation(
[in] ICondition *pcSub,
[in] CONDITION_CREATION_OPTIONS cco,
[in] REFIID riid,
[out] void **ppv
);
Parameters
[in] pcSub
Type: ICondition*
A pointer to the ICondition subnode to be negated. For default options, use the CONDITION_CREATION_DEFAULT flag.
[in] cco
Type: CONDITION_CREATION_OPTIONS
The condition creation operation of the leaf condition as the CONDITION_CREATION_OPTIONS enumeration.
[in] riid
Type: REFIID
The desired IID of the enumerating interface: either IEnumUnknown, IEnumVARIANT, or (for a negation condition) IID_ICondition.
[out] ppv
Type: void**
Receives a pointer to zero or more ICondition and ICondition2 objects.
Return value
Type: HRESULT
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
Remarks
Logically simplifying a condition node usually results in a smaller, more easily traversed and processed condition tree. For example, if pcSub is itself a negation condition with a subcondition C, then the double negation is logically resolved, and ppcResult is set to C. Without simplification, the resulting tree would look like NOT — NOT — C.
Applications that need to execute queries based on the condition tree would typically benefit from setting this parameter to TRUE.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 7 [desktop apps only] |
| Minimum supported server | Windows Server 2008 R2 [desktop apps only] |
| Target Platform | Windows |
| Header | structuredquery.h |
See also
Reference