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Qualifier Additions

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Fabian Peters edited this page Aug 3, 2015 · 1 revision

#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.

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