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RAD Studio VCL Reference
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Variants.NullEqualityRule Variable
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RAD Studio VCL Reference
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Specifies rule for Null variant equality comparison.
NullEqualityRule: TNullCompareRule = ncrLoose;
TNullCompareRule NullEqualityRule = ncrLoose;
NullEqualityRule determines the rule for handling equality comparisons (equals or not-equals) when one of the values compared is a variant containing a null value. NullEqualityRule can have the following values:
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ncrLoose |
(Default.) A variant containing a null is treated as a unique value that is only equal to another variant containing a null. |
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ncrStrict |
An equality comparison of a variant containing a null is always false, regardless of the other value. |
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ncrError |
An equality comparison raises an EVariantInvalidNullOpError if either value is a variant containing a null. |
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Copyright(C) 2009 Embarcadero Technologies, Inc. All Rights Reserved.
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