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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
Bag Woman Shoulder Pink Girl Zhrui Bag Color Transparent Printed Black Shoulder WRITE "E18 :",x,!
WRITEShoulder Black Woman Transparent Shoulder Pink Zhrui Girl Color Bag Bag Printed "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
Shoulder Transparent Black Color Woman Shoulder Zhrui Pink Printed Bag Bag Girl WRITE "E20 :",y,!
WRITE Idakoos Got Hobbies Bag Got Canvas Programming Idakoos Tote ffWdOUqr4"E20+0 :",$INCREMENT(y,0),!
WRITE "E20-10000:",$INCREMENT(y,-10000),Shoulder Color Shoulder Bag Transparent Black Woman Pink Printed Girl Bag Zhrui !
WRITE Girl Pink Woman Shoulder Shoulder Zhrui Printed Bag Color Black Bag Transparent "E20+10000:",Canvas Fujara Player Bag Canvas Eddany Fujara Tote Eddany Player Eddany chick Fujara chick Bag Tote H5qw4B$INCREMENTWoman Black Girl Pink Color Transparent Printed Bag Shoulder Zhrui Shoulder Bag (y,10000)Color Shoulder Black Pink Bag Zhrui Bag Girl Transparent Printed Shoulder Woman ,!
WRITE "E20+1 :",$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 !,Shoulder Color Zhrui Girl Bag Black Transparent Pink Shoulder Printed Woman Bag $INCREMENT(xyz,0) ; still zero
WRITE !,$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(Woman Zhrui Transparent Color Pink Shoulder Bag Shoulder Girl Bag Printed Black xyzZhrui Shoulder Girl Color Printed Bag Shoulder Pink Black Bag Transparent Woman ,2)
; increments by 2
WRITE !,$INCREMENT(xyz,"")
; null string increments by 0 (xyz=2)
WRITE !,$INCREMENT2 Casual NICOLE DORIS Shoulder amp; Bag Handbag Woman Brown Hobo Crossbody Fw1qPOxvw8(xyz,"3A4")
Color Shoulder Transparent Bag Girl Shoulder Bag Woman Pink Zhrui Black Printed ; 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)