DbServer.OrderSkipUnique Method |  |
Move the record pointer to the next or previous unique key in the controlling order.
Namespace: VO
Assembly: VORDDClasses (in VORDDClasses.dll) Version: 2.19
SyntaxRequest Example
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TRUE if successful; otherwise, FALSE.
Parameters
- nDirection (Optional)
- Type: Usual
Specifies whether the method 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: UsualTRUE if successful; otherwise, FALSE.
Remarks
DBServer:OrderSkipUnique() allows you to make a non-unique order look like a unique order. Each time you use DBServer:OrderSkipUnique(), you are moved to the next (or previous) unique key, exactly as if you were skipping through a unique order. This method eliminates the problems associated with maintaining a unique order, while providing you with fast access to unique keys.
DBServer:OrderSkipUnique() sends a NotifyIntentToMove message before the operation.
It also sends a NotifyRecordChange message upon successful completion.
It also sends a NotifyRecordChange message upon successful completion.
Examples
This examples uses DBServer:OrderSkipUnique() to build an array of unique last names beginning with the letter "J:"
X#
1METHOD LastUnique() CLASS Customer 2LOCAL aLast[0] AS ARRAY 3SELF:SetIndex("last") // Use the last name order 4? SELF:OrderIsUnique() // Result: FALSE 5// Only look at the J's 6SELF:OrderScope(0, "J") 7SELF:OrderScope(1, "J") 8SELF:GoTop() 9DO WHILE !SELF:EOF // Add all the unique J 10AADD(aLast, Last) // last names to aLast 11SELF:OrderSkipUnique() 12ENDDO 13// Clear the scope 14SELF:OrderScope(0, NIL) 15SELF:OrderScope(1, NIL) 16RETURN aLast
See Also