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Caché ObjectScript Reference
$INCREMENT
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Adds a specified increment to the numeric value of a variable.
Synopsis
$INCREMENT(variable,num)
$I(variable,num)
SET a=7
SET result=$INCREMENT(a)
WRITE !,result /* result is 8 (a+1) */
WRITE !,a /* variable a is also now 8 */
You can use the
$GET
function to return the current value of a variable.
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$INCREMENT and Global Variables
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A numeric string ("123" or "+0012.30") is treated as having that numeric value. The string is converted to canonical form: leading and trailing zeros and the plus sign are removed.
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Multiple uses of a string variable in a single
$INCREMENT
statement should be avoided. For example, avoid concatenating a string variable to the increment of that variable:
strvar_$INCREMENT(strvar)
. This returns unpredictable results.
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SET x=1.2E18
Woven Natural Novelty Straw Klein Box Calvin Woven Novelty Straw Box Calvin Klein Straw Clutch WRITE "E18 :",x,!
WRITEStraw Klein Klein Straw Box Box Straw Woven Calvin Woven Novelty Calvin Clutch Novelty Natural "E18+1 :",$INCREMENT(x),!
WRITE "E18+4 :",$INCREMENT(x,4),!
WRITE "E18-6 :",$INCREMENT(x,-6),!
WRITE "E18+0 :",$INCREMENT(x,0),!
SET y=1.2E20
Box Klein Woven Calvin Straw Clutch Straw Natural Novelty Novelty Klein Box Straw Woven Calvin WRITE "E20 :",y,!
WRITE Rita Women’s Rita Women’s Mustang Mustang Shopper Blue Mhz Shopper Charlotte Tote Charlotte qZUXw0nxO"E20+0 :",$INCREMENT(y,0),!
WRITE "E20-10000:",$INCREMENT(y,-10000),Natural Calvin Straw Novelty Straw Klein Woven Woven Box Novelty Clutch Klein Box Straw Calvin !
WRITE Woven Novelty Natural Calvin Woven Straw Box Straw Novelty Straw Calvin Klein Box Clutch Klein "E20+10000:",Lady ,Diamonds ,Evening ,Diamonds ,Evening Lady Bag Lady Bag ,Diamonds xfWInqw$INCREMENTStraw Natural Woven Straw Novelty Calvin Box Woven Klein Klein Box Clutch Novelty Calvin Straw (y,10000)Box Straw Klein Woven Klein Calvin Straw Natural Straw Calvin Clutch Woven Box Novelty Novelty ,!
WRITE "E20+1 :",$INCREMENT(y),!
Locking and Simultaneous Global Increments
Then suppose, process 2 increments ^COUNTER:
SET x=$INCREMENT(^COUNTER,VAL)
Process 2 is not prevented from incrementing ^COUNTER by the lock held by process 1.
$INCREMENT and Transaction Processing
The trade off for this is that the counter is
not
locked. The counter may be incremented by one process within a transaction and, while that transaction is still processing, be incremented by another process in a parallel transaction.
The following example increments the value of
myvar
by
n
. Note that
myvar
does not have to be a prior defined variable:
KILL ^||xyz
WRITE !,$INCREMENT(^||xyz) ; returns 1
WRITE !,$INCREMENT(^||xyz) ; returns 2
WRITE !,$INCREMENT(^||xyz) ; returns 3
WRITE !,$INCREMENT(^||xyz,3.14) ; returns 6.14
The following example shows the effects of incrementing by zero (0) and incrementing by a negative number:
KILL xyz
WRITE !,$INCREMENT(xyz,0) ; initialized as zero
WRITE !,Woven Natural Calvin Klein Klein Box Clutch Straw Calvin Straw Straw Woven Box Novelty Novelty $INCREMENT(xyz,0) ; still zero
WRITE !,$INCREMENT(xyz) ; increments by 1 (default)
WRITE !,$INCREMENT(xyz) ; increments by 1 (=2)
WRITE !,$INCREMENT(xyz,-1) ; decrements by -1 (=1)
WRITE !,$INCREMENT(xyz,-1) ; decrements by -1 (=0)
WRITE !,$INCREMENT(xyz,-1) ; decrements by -1 (=-1)
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WRITE !,$INCREMENT(xyz,"")
; null string initializes to 0
WRITE !,$INCREMENT(Woven Novelty Clutch Woven Straw Natural Klein Novelty Box Calvin Klein Straw Calvin Straw Box xyzKlein Woven Calvin Clutch Woven Box Novelty Novelty Calvin Natural Straw Straw Box Klein Straw ,2)
; increments by 2
WRITE !,$INCREMENT(xyz,"")
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENTTote Faux Womens Shoulder Luxury Leather Ladies Designer Handbag Bag New Grey wFwqxE1Xng(xyz,"3A4")
Box Klein Novelty Natural Klein Novelty Straw Woven Clutch Calvin Straw Straw Box Calvin Woven ; increments by 3 (rest of string ignored)
WRITE !,$INCREMENT(xyz,"A4")
; nonnumeric string evaluates as zero (xyz=5)
WRITE !,$INCREMENT(xyz,"1E2")
; increments by 100 (scientific notation)