Data Access Layer

public interface IStorageDataAccessAgent 
   { 
      DataSet QueryPatients( MatchingParameterCollection matchingEntitiesCollection ) ; 
      DataSet QueryStudies ( MatchingParameterCollection matchingEntitiesCollection ) ; 
      DataSet QuerySeries  ( MatchingParameterCollection matchingEntitiesCollection ) ; 
      DataSet QueryCompositeInstances ( MatchingParameterCollection matchingEntitiesCollection ) ; 
 
      int MaxQueryResults {get; set;} 
       
      bool QueryCompositeInstancesAsync ( MatchingParameterCollection matchingEntitiesCollection, QueryPageInfo queryPageInfo) ; 
      void CancelQueryCompositeInstancesAsync(QueryCompositeInstancesArgs args); 
       
      event EventHandler<QueryCompositeInstancesArgs>QueryCompositeInstancesStarting; 
      event EventHandler <QueryCompositeInstancesArgs>QueryCompositeInstancesCompleted; 
       
      int FindPatientsCount           ( MatchingParameterCollection matchingEntitiesCollection ) ; 
      int FindStudiesCount            ( MatchingParameterCollection matchingEntitiesCollection ) ; 
      int FindSeriesCount             ( MatchingParameterCollection matchingEntitiesCollection ) ; 
      int FindCompositeInstancesCount ( MatchingParameterCollection matchingEntitiesCollection ) ; 
             
      bool IsPatientsExists           ( string patientID ) ; 
      bool IsStudyExists              ( string studyInstanceUID ) ; 
      bool IsSeriesExists             ( string seriesInstanceUID ) ; 
      bool IsCompositeInstancesExists ( string sopInstanceUID ) ; 
       
      void UpdateCompositeInstance ( CompositeInstanceDataSet compositeInstanceDataSet ) ; 
       
      void StoreDicom ( DicomDataSet dataSet,  
                        string referencedFileName,  
                        string retrieveAe, 
                        ReferencedImages[] images, 
                        bool updateExistentPatient,  
                        bool updateExistentStudy,  
                        bool updateExistentSeries,  
                        bool updateExistentInstances ) ; 
                         
      int DeletePatient  ( MatchingParameterCollection matchingEntitiesCollection ) ; 
      int DeleteStudy    ( MatchingParameterCollection matchingEntitiesCollection ) ; 
      int DeleteSeries   ( MatchingParameterCollection matchingEntitiesCollection ) ; 
      int DeleteInstance ( MatchingParameterCollection matchingEntitiesCollection ) ; 
       
   }