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OrdSkipUnique Function (RT)

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XSharpLoadLibrary Function (RT)

Year Function (RT)

OrdSkipUnique Function

Move the record pointer to the next or previous unique key in the controlling order.

Namespace: XSharp.RT
Assembly: XSharp.RT (in XSharp.RT.dll) Version: 2.21

Syntax

Copy

 FUNCTION OrdSkipUnique(
	nDirection
) AS USUAL CLIPPER

[ClipperCallingConventionAttribute(new string[] { ... })]
public static Usual OrdSkipUnique(
	Usual nDirection = default
)

Request Example View Source

Parameters

nDirection (Optional): Type: Usual
Specifies whether the function will skip to the next or previous key. Omitting this value or specifying it as 1 skips to the next unique key. Specifying a negative value skips to the previous key.

Return Value

Type: Usual
TRUE if successful; otherwise, FALSE.

Remarks

OrdSkipUnique() allows you to make a non-unique order look like a unique order.
Each time you use OrdSkipUnique(), you are moved to the next (or previous) unique key, exactly as if you were skipping through a unique order.
This function eliminates the problems associated with maintaining a unique order, while providing you with fast access to unique keys. By default, this function operates on the currently selected work area.
It can be made to operate on an unselected work area by specifying it within an aliased expression

Examples

This examples uses OrdSkipUnique() to build an array of unique last names beginning with the letter "J:"

Copy

 1FUNCTION LastUnique()
 2    LOCAL aLast[0]
 3    SET INDEX TO last            // Use the last name order
 4    ? OrdIsUnique()            // Result: FALSE
 5    SET SCOPE TO "J"            // Only look at the J's
 6    GO TOP
 7    DO WHILE !EOF()            // Add all the unique J
 8        AADD(aLast, Last)        // last names to aLast
 9        OrdSkipUnique()
10    ENDDO
11    SET SCOPE TO            // Clear the scope
12    RETURN aLast            // Return array of
13                        // unique J names

Reference

Functions, Globals and Defines

XSharp.RT Namespace

OrdIsUnique(Usual, Usual)

SetUnique