IMatrixFactory.CreateQuery

Syntax

CreateQuery(Value: IMatrix): IMatrixQuery;

Parameters

Value. Matrix, for which a query is created.

Description

The CreateQuery method creates a query that is used to get information about existing data in the specified matrix.

Example

Executing the example requires a time series database with the CUBE identifier.

Add links to the Metabase, Matrix, Dimensions, and Cubes system assemblies.

Sub Main;
Var
    Mb: IMetabase;
    ObjDes: IMetabaseObjectDescriptor;
    CubDest: ICubeInstanceDestination;
    Sels, SelsAll: IDimSelectionSet;
    sDim: String;
    Ei: Integer;
    Sel: IDimSelection;
    Matrix, MatrixRes: IMatrix;
    MatFac: MatrixFactory;
    Query: IMatrixQuery;
    Filter: IMatrixQueryFilter;
    ArList: IArrayList;
    Result: IMatrixQueryResult;
    Ranges: IMatrixQueryFilterRanges;
    Range: IMatrixQueryFilterRange;
Begin
    Mb := MetabaseClass.Active;
    ObjDes := Mb.ItemById("CUBE");
    CubDest := (ObjDes.Open(Null) As ICubeInstance).Destinations.DefaultDestination;
    Sels := CubDest.CreateDimSelectionSet;
    For Each Sel In Sels Do
        sDim := Sel.Dimension.Name;
        If sDim = "Calendar" Then
            For Ei:=10 To 50 Do
                Sel.SelectElement(Ei, False);
            End For;
        Else
            Sel.SelectAll;
        End If;
    End For;
    SelsAll := Sels;
    Matrix := CubDest.Execute(SelsAll);
    //create query used to get information about existing data in the specified matrix
    MatFac := New MatrixFactory.Create;
    Query := (MatFac As IMatrixFactory).CreateQuery(Matrix);
    //set up filtering parameters for matrix data
    Filter := Query.Filter;
    //get collection of filtering ranges for matrix data
    Ranges := Filter.Ranges;
        //add a data filtering range
        Range := Ranges.Add;
        Range.Max := 10;
        Range.Min := 0;
    //determine selection of dictionaries collection for matrix query
    Filter.Selection := Sels;
    //get a dynamic array of filter elements
    ArList := Filter.Values;
        //get number of elements in the array
        debug.WriteLine(ArList.Count);
    //check whether we received the required matrix
    If Matrix = Query.Matrix Then
    debug.WriteLine("Matrices match");
    End If;
    //determine parameters of matrix iterator
    Query.Select_;
    //perform query
    Query.Execute;
    //get query results
    Result := Query.Result;
    //result of query as a matrix
    MatrixRes := Result.Matrix;
End Sub Main;