FUNCTION xpxSelectAggrElements (aggrId                  : AGGREGATE OF GENERIC;
                                condition               : STRING;
                                options                 : INTEGER;
                                firstIndex, maxHits     : INTEGER;
                                VAR indexOfLastFound    : INTEGER;
                                VAR actualHits          : INTEGER;
                                VAR resultAggrId        : LIST OF INTEGER)
                                status                  : INTEGER;

The xpxSelectAggrElements function produces a list containing the indexes of all the elements of an aggregate that matches a given Express-X logical expression. This function only handles aggregates with primitive data type elements.

Arguments

Type	Name	Comment
AGGREGATE OF GENERIC	aggrId	A numeric aggregateID that uniquely identifies the aggregate of interest in the EDMdatabase This may be any type of aggregate, both persistent and scratch with elements of primitive data types.
STRING	condition	A conditional statement, written in Express-X, that the aggregate elements shall match. References to the element it self is done by the symbol SELF. A string comparing condition may therefore be written SELF = SCHMIDT or SELF LIKE SCHMIDT or even xpxLIKE(SELF, SCHMIDT) An unset condition, will match all aggregate elements. All symbolic Express-X logical expressions are legal <condition> values. The <condition> argument will be compiled by the EDMexpressXCompiler
INTEGER	options	Not used.
INTEGER	firstIndex	The aggregate index from which to start searching for matching elements.
INTEGER	maxHits	Specifies the maximum number of indexes that may be returned in the list.
INTEGER	indexOfLastFound	The index of the last found matching element. This return value enables incremental search for matching elements. See example below.
INTEGER	actualHits	The number of matching elements found.
LIST OF INTEGER	resultAggrId	A numeric aggregateID that uniquely identifies the volatile list that will contain the index of each matching element.

Return Value

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Options

Example

firstIndex = 1;
maxHits := 10;
actualHits := maxHits;
 
WHEN (actualHits = maxHits);
BEGIN
  stat := xpxSelectAggrElements(myAggrId, "SELF = SHCMIDT",0, firstIndex, maxHits, lastMatch, actualHits, indexList);
  (* Process matching elements here *)
   firstIndex := lastMatch + 1;
END;

Arguments

Return Value

Options

Example

See also

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