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Qualifier Additions
Fabian Peters edited this page Aug 3, 2015
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#Houdah Qualifier Additions
Houdah Frameworks include a number of custom qualifiers:
- InSetQualifier: WHERE a IN (x, y, z)
- InSubQueryQualifier: WHERE a IN (SELECT x FROM A ...)
- ExistsInRelationshipQualifier: WHERE EXISTS (SELECT 1 FROM A WHERE ...)
- BestMatchQualifier: WHERE a IN (SELECT MAX(x) ...)
- PeriodQualifier: operates on month precision dates stored as year and month fields
- PiggybackQualifier: piggyback data onto qualifiers
- TrueQualifier: qualifier to match all objects
- FalseQualifier: qualifier to match no objects
In-memory search implementations are found in the HoudahEOControl framework. Matching support classes for SQL generation are found in the HoudahEOAccess framework.