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Jaa

RecordRef.CurrentKeyIndex([Integer]) Method

  • Artikkeli

Version: Available or changed with runtime version 1.0.

Gets or sets the current key of the table referred to by the RecordRef. The current key is set or returned as a number. This first key = 1, and so on. If RecordRef does not have an active record, CURRENTKEYINDEX will return -1. If this value is then passed to KEYINDEX, an index out of bounds error will occur. Therefore it is important to implement a check of the RecordRef parameter.

Syntax

[CurrentKeyIndex := ]  RecordRef.CurrentKeyIndex([NewKeyIndex: Integer])

Note

This method can be invoked using property access syntax.

Parameters

RecordRef
 Type: RecordRef
An instance of the RecordRef data type.

[Optional] NewKeyIndex
 Type: Integer
The number of the new key.

Return Value

[Optional] CurrentKeyIndex
 Type: Integer
The number of the current key.

Example

The following example loops through four tables (36-39) opens each table as a RecordRef variable that is named MyRecordRef. The CurrentKeyIndex method retrieves the current key index of the tables. The name of the table and the current key index of each table are displayed in a message box. Each table is close before the next one is opened.

var
    MyRecordRef: RecordRef;
    CurrentKeyIndex: Integer;
    i: Integer;
    varFromTable: Integer;
    varToTable: Integer;
    Text000: Label 'Table: %1  Current key index: %2';
begin
    varFromTable := 36;  
    varToTable := 39;  
    for i := varFromTable to varToTable do begin  
      MyRecordRef.Open(i);  
      CurrentKeyIndex := MyRecordRef.CurrentKeyIndex;  
      Message(Text000, MyRecordRef.Name, CurrentKeyIndex);  
      MyRecordRef.Close;  
    end;  
end;

RecordRef Data Type
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