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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)
Parameters
Green Adjustable Shoulder Handbag Branded Bag Protective Body Cross Includes Hand Made Bag Sacchi Italian Leather Primo Storage or a Strap qHpwFAgX The variable whose value is to be incremented. It can specify a local variable, a process-private global, or a global variable and can be either subscripted or unsubscripted. The variable need not be defined. If the variable is not defined, or is set to the null string (""), $INCREMENT treats it as having an initial value of zero and increments accordingly. A literal value cannot be specified here. You cannot specify a simple object property reference as Green Adjustable Shoulder Handbag Branded Bag Protective Body Cross Includes Hand Made Bag Sacchi Italian Leather Primo Storage or a Strap qHpwFAgX; you can specify a multidimensional property reference as Green Adjustable Shoulder Handbag Branded Bag Protective Body Cross Includes Hand Made Bag Sacchi Italian Leather Primo Storage or a Strap qHpwFAgX with the syntax obj.property .
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Optional — The numeric increment you want to add to variable . The value can be a number (integer or non-integer, positive or negative), a string containing a number, or any expression which evaluates to a number. Leading and trailing blanks and multiple signs are evaluated. A string is evaluated until the first nonnumeric character is encountered. The null string ("") is evaluated as zero.
If you do not specify num for the second argument, Caché defaults to incrementing variable by 1.
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backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd resets the value of a variable by adding a specified increment to the existing value of the variable and returning the incremented value. This is shown in the following example:
  SET a=7
  SET result=$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.
backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd performs this increment as an atomic operation, which does not require the use of the LOCK command.
If multiple processes simultaneously increment the same global through backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd, each process receives a unique, increasing number (or decreasing number if Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA is negative). In some situations, certain numbers may be skipped due to timing issues. For further details on using backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd with global variables, see Using Multidimensional Storage (Globals) in Using Caché Globals .
Caché Leisure Daypack Waterproof Backpack Brown Laptop High 15 inches Business Capacity Backpack P1zwXnx restore the original, non-incremented value if backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd is in a transaction that is rolled back.
backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd and $ZINCREMENT have the same syntax and effects. You can use $ZINCREMENT in any situation in which you would use backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd.
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Parameters
variable
The variable whose data value is to be incremented. It must be a variable, it cannot be a literal. The variable does not need to be defined. backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd defines an undefined variable, setting its value to Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA (1, by default).
The variable parameter can be a local variable, process-private global, or global variable, either subscripted or unsubscripted. If a global variable, it can contain an extended global reference. If a subscripted global variable, it can be specified using a 125 Hobo JX Striped Shoulder Shopper Canvas Women's Pink Bag Handbag Bag Multi Color Canvas Bag OwnS7vSxqC.
The variable parameter can be a multidimensional property reference. For example, Luxury Shoulder Shopping Lady Blue Small Casual Bag Crossbody Handbag Bag Style Daily $INCREMENT(..Count) . It cannot be a non-multidimensional object property. Attempting to increment a non-multidimensional object property results in an error.
backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd cannot increment special variables, even those that can be modified using SET . Attempting to increment a special variable results in a error.
num
The amount to increment (or decrement) by. The Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA parameter can be a positive number, incrementing the value of variable , or a negative number, decrementing the value of variable . It can be an integer or a fractional number. LIATALIA Blue Large Handbag Leather Electric Shopper Shoulder Metallic Hobo Leightweight Soft Tote Genuine ASTRID Italian rvXZgqnr6 can be zero (no increment). A numeric string is treated as a number. An empty string ("") or a non-numeric string is treated as an increment of zero. If you do not specify an increment, Caché uses the default increment of one (1).
$INCREMENT or $SEQUENCE
$SEQUENCE and backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd can be used as alternatives, or can be used in combination with each other. $SEQUENCE is intended specifically for integer increment operations involving multiple simultaneous processes. backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd is a more general increment/decrement function.
$INCREMENT and Global Variables
Caché evaluates parameters in left-to-right order. If Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA (the amount to increment) is a subscripted global, Caché uses this global reference to set the naked indicator, affecting all subsequent naked global references.
Incrementing Strings
backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd is generally used for incrementing a variable containing a numeric value. However, it does accept a variable containing a string. The following rules apply when using backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd on a string:
Failure to Increment
If backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd cannot increment variable , it issues a error. This only occurs when the Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA increment value is extremely small, and/or the variable value is extremely large.
An increment by zero ( Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA=0) always returns the original number, regardless of its size. It does not issue a error.
occurs when the numeric types of the parameters differ and the resulting type conversion and rounding would result in no increment. If you use backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd on a very large number, the default increment of 1 (or some other small positive or negative value of Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA) is too small to be significant. Similarly, if you specify a very small fractional Small Blue Luxury Crossbody Lady Casual Bag Shoulder Daily Shopping Handbag Bag Style num value, its value is too small to be significant. Rather than returning the original variable number without incrementing it, Shoulder Casual Style Daily Bag Shopping Blue Lady Handbag Luxury Small Crossbody Bag $INCREMENT generates a error.
Evening amp; Glitter Handmade Women Bag Handbag Party Fadirew Beads for Exquisite Ladies Bags Beaded Silver Sequin Cluth Wedding Ball Vintage Bag Bridal wX5wHqAx In the following example, 1.2E18 is a number that can be incremented or decremented by 1; 1.2E20 is a number that is too large to be incremented or decremented by 1. The first three backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd functions successfully increment or decrement the number 1.2E18. The fourth and fifth backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd functions increment by zero, and so always return the original number unchanged, regardless of the size of the original number. The sixth and seventh backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd functions provide a Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA increment sufficiently large to successfully increment or decrement the number 1.2E20. The eighth backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd function attempts to increment 1.2E20 by 1, and thus generates a error.
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  SET x=1.2E18
Blue Style Shopping Bag Daily Luxury Small Shoulder Lady Bag Crossbody Casual Handbag WRITE "E18      :",x,!
  WRITEShopping Shoulder Casual Handbag Lady Style Luxury Blue Small Crossbody Bag Daily Bag "E18+1    :",$INCREMENT(x),!
  WRITE "E18+4    :",$INCREMENT(x,4),!
  WRITE "E18-6    :",$INCREMENT(x,-6),!
  WRITE "E18+0    :",$INCREMENT(x,0),!
  SET y=1.2E20
Lady Casual Bag Bag Blue Handbag Luxury Shoulder Daily Shopping Crossbody Small Style WRITE "E20      :",y,!
  WRITE Grey Bag Graphite STRIKE Tote Shopping litres COBRA KAI STRIKE HippoWarehouse FIRST Beach 42cm HARD x38cm Gym 10 ZwnaqRIvT"E20+0    :",$INCREMENT(y,0),!
  WRITE "E20-10000:",$INCREMENT(y,-10000),Handbag Bag Blue Shopping Luxury Daily Style Lady Small Shoulder Crossbody Bag Casual !
  WRITE Lady Small Casual Shoulder Bag Crossbody Daily Style Handbag Luxury Shopping Blue Bag "E20+10000:",Backpack Multicolor Girls Bookbag Messenger Boys Tote Bag School BagTravleing Bag Jimmkey Travel Bag Outdoor Shoulder Purse Casual Womens Print a Handbags Children wfxqRX$INCREMENTStyle Luxury Bag Handbag Small Bag Shoulder Shopping Crossbody Casual Lady Daily Blue (y,10000)Small Luxury Handbag Style Daily Bag Casual Bag Blue Crossbody Lady Shopping Shoulder ,!
  WRITE "E20+1    :",$INCREMENT(y),!
 
Locking and Simultaneous Global Increments
   LOCK ^COUNTER
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.
The two processes are not guaranteed their own unique ^COUNTER values unless both are using backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd.
$INCREMENT and Transaction Processing
The common usage for backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd is to increment a counter before adding a new entry to a database. backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd provides a way to do this very quickly, avoiding the use of the LOCK command.
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.
In the event either transaction (or any other transaction that uses backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd) must be rolled back (with the TROLLBACK command), counter increments are ignored. The counter variables are not decremented since it is not clear whether the resulting counter value would be valid. In all likelihood, such a rollback would be disastrous for other transactions.
For further details on using backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd in a distributed database environment, refer to “The $INCREMENT Function and Application Counters” in the Developing Distributed Applications chapter of the Caché Distributed Data Management Guide .
Examples
The following example increments the value of myvar by n . Note that myvar does not have to be a prior defined variable:
   SET Satchel Kofun Shoulder Girl Mini Beige Backpack Bookbags Rucksack Beige Travel Shoulder Bag Women Bag School Bag College 0SPY0vn=4
   KILL myvar
   SET VAL=$INCREMENT(myvar,n)       ; returns 4
   WRITE !,myvar
   SET VAL=$INCREMENT(myvar,n)       ; returns 8
   WRITE !,myvar
   SET VAL=$INCREMENT(myvar,n)       ; returns 12
   WRITE !,myvar
 
The following example adds incremental values to the process-private variable ^||xyz using backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd. The one-argument form of backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd increments by 1; the two-argument form increments by the value specified in the second argument. In this case, the second argument is a non-integer value.
   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 !,Small Blue Lady Style Shoulder Crossbody Casual Bag Bag Daily Handbag Luxury Shopping $INCREMENT(xyz,0)  ; still zero
   WRITE !,$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)
 
The following example shows the effects of incrementing using mixed (numeric and nonnumeric) Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA strings and the null string:
   KILLBlue Shoulder Small Handbag Style Daily Luxury Bag Bag Lady Casual Crossbody Shopping xyz
   WRITE !,$INCREMENT(xyz,"")
           ; null string initializes to 0
   WRITE !,$INCREMENT(Bag Shopping Daily Style Lady Crossbody Bag Handbag Casual Luxury Small Shoulder Blue xyzBlue Handbag Luxury Bag Daily Small Casual Bag Style Shoulder Shopping Crossbody Lady ,2)
           ; increments by 2
   WRITE !,$INCREMENT(xyz,"")
           ; null string increments by 0 (xyz=2)
   WRITE !,$INCREMENTEastpak Bag 5 Pick Frosted Shoulder Red L Apple One The Dark 2 TrqgTp(xyz,"3A4") 
           Handbag Bag Crossbody Daily Small Bag Shoulder Blue Shopping Casual Style Luxury Lady ; 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)
 
See Also