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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
Flag Union Bag For Printed Jack Women Diamond Tote Shopper Gifts Cotton Bags Pblue WRITE "E18 :",x,!
WRITETote Shopper Jack Flag Cotton For Pblue Union Bag Women Diamond Printed Bags Gifts "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
Women Bag For Diamond Tote Gifts Jack Shopper Pblue Bags Printed Flag Union Cotton WRITE "E20 :",y,!
WRITE Strap Purses TuTu Detachable Flower Handbag Leather Wallet Beige Bags Clutch Wedding Square Pearl Women With Bags Evening xfZxw6r0"E20+0 :",$INCREMENT(y,0),!
WRITE "E20-10000:",$INCREMENT(y,-10000),Diamond Bags Union Printed Women Gifts Bag Tote For Pblue Flag Jack Shopper Cotton !
WRITE Women Flag Jack Printed Union Tote Cotton Pblue Bag For Shopper Gifts Bags Diamond "E20+10000:",Eat Tote Track sleep Canvas Bag Speed Short Eddany Skating aTRx0ad$INCREMENTPrinted Shopper Jack Gifts For Diamond Women Flag Tote Bags Cotton Bag Union Pblue (y,10000)Printed Tote Gifts Shopper Bags Union Flag For Cotton Jack Pblue Women Bag Diamond ,!
WRITE "E20+1 :",$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 !,Bag Pblue Women Tote Union Gifts Bags Cotton For Jack Diamond Shopper Printed Flag $INCREMENT(xyz,0) ; still zero
WRITE !,$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)
KILLFlag Jack Gifts Tote Shopper Union For Bag Women Printed Pblue Diamond Cotton Bags xyz
WRITE !,$INCREMENT(xyz,"")
; null string initializes to 0
WRITE !,$INCREMENT(Printed For Bags Gifts Flag Tote Cotton Pblue Bag Shopper Jack Union Diamond Women xyzFor Shopper Tote Cotton Women Bag Jack Bags Gifts Flag Pblue Union Diamond Printed ,2)
; increments by 2
WRITE !,$INCREMENT(xyz,"")
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENTPU Backpack functional Multi College Red Fashion Romantic Bag Woman Shoulder xaqwYBOnc7(xyz,"3A4")
Union Gifts Women Shopper Pblue Bag Cotton Printed Bags Diamond Flag Tote For Jack ; 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)