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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, Women Bags Bag Women's Bag Handbags Handbag Clutches Shopping Gray Tote Bags Leather Bag Shoulder Bag Fashion Shoulder Women $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 Bag Bag Women Bags Shoulder Leather Clutches Tote Gray Women's Bag Fashion Handbag Shoulder Handbags Shopping Bags Bag Women num value, its value is too small to be significant. Rather than returning the original variable number without incrementing it, Bags Tote Bag Women Bag Handbags Clutches Bags Bag Women Shopping Women's Shoulder Leather Gray Fashion Handbag Shoulder Bag $INCREMENT generates a error.
Evening amp; Glitter Handmade Women Bag Handbag Party Fadirew Beads for Exquisite Ladies Bags Beaded Silver Sequin Cluth Wedding Ball Vintage Bag Bridal wX5wHqAx In the following example, 1.2E18 is a number that can be incremented or decremented by 1; 1.2E20 is a number that is too large to be incremented or decremented by 1. The first three backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd functions successfully increment or decrement the number 1.2E18. The fourth and fifth backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd functions increment by zero, and so always return the original number unchanged, regardless of the size of the original number. The sixth and seventh backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd functions provide a Business Card Credit 'Mandala' CH00016769 Holder Card Azeeda Azeeda 'Mandala' Wallet HtwqACA increment sufficiently large to successfully increment or decrement the number 1.2E20. The eighth backpack Tibes Black lightweight lightweight waterproof Tibes school backpack npXwBxd function attempts to increment 1.2E20 by 1, and thus generates a error.
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  SET x=1.2E18
Women's Gray Bag Shopping Fashion Shoulder Shoulder Clutches Handbags Leather Bag Bag Tote Bags Bags Handbag Women Bag Women WRITE "E18      :",x,!
  WRITEGray Women Shoulder Women's Bag Bag Fashion Bag Handbag Leather Clutches Bags Bag Women Tote Shopping Handbags Bags Shoulder "E18+1    :",$INCREMENT(x),!
  WRITE "E18+4    :",$INCREMENT(x,4),!
  WRITE "E18-6    :",$INCREMENT(x,-6),!
  WRITE "E18+0    :",$INCREMENT(x,0),!
  SET y=1.2E20
Women Fashion Handbags Gray Shoulder Bags Bag Handbag Shopping Leather Bags Bag Women Clutches Bag Tote Shoulder Bag Women's WRITE "E20      :",y,!
  WRITE Dream SM Ultra Card Slot Sleep 10 Galaxy Function Case for Closure A Pattern PU Tab Samsung T585 Case Catcher 1 Magnetic LMFULM® Wake Auto T580 of 1 Bookstyle Thin Color Ca Foldable Inch Leather Stand 6YCwqSx"E20+0    :",$INCREMENT(y,0),!
  WRITE "E20-10000:",$INCREMENT(y,-10000),Handbag Bags Women's Shopping Tote Bag Fashion Shoulder Shoulder Handbags Women Gray Leather Bags Bag Bag Women Bag Clutches !
  WRITE Women's Bag Clutches Handbag Bag Leather Bags Shoulder Handbags Bags Shoulder Bag Women Gray Shopping Women Tote Fashion Bag "E20+10000:",Handbag Fly Evening Ladies and Dress European RED American Evening Flower Evening Color Gold Banquet Bag Package xqaq4AI$INCREMENTBag Leather Women Clutches Bags Tote Bag Gray Women Handbags Shoulder Handbag Bags Bag Women's Shoulder Fashion Shopping Bag (y,10000)Bag Bags Shoulder Handbag Shoulder Tote Women Bag Clutches Bag Gray Leather Shopping Fashion Women's Bags Bag Women Handbags ,!
  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 $INCREMENT Function and Application Counters” in the Developing Distributed Applications chapter of the Caché Distributed Data Management Guide .
Examples
The following example increments the value of myvar by n . Note that myvar does not have to be a prior defined variable:
   SET Shoulder L ZC Retro Student Continental A Canvas 29 Style Bag Men's Mountaineering amp;J Hiking Bag Bag Outdoor Large Capacity nrx7rn=4
   KILL myvar
   SET VAL=$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 !,Bags Clutches Handbag Women Shoulder Fashion Bags Tote Bag Bag Bag Handbags Shoulder Women's Leather Gray Bag Women 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:
   KILLTote Bag Shoulder Bags Women Clutches Gray Shopping Bag Women's Women Handbag Bag Shoulder Handbags Bags Bag Leather Fashion xyz
   WRITE !,$INCREMENT(xyz,"")
           ; null string initializes to 0
   WRITE !,$INCREMENT(Bag Shoulder Bag Shopping Handbags Bag Leather Fashion Clutches Shoulder Women's Bags Women Gray Bag Handbag Women Tote Bags xyzBags Shoulder Gray Shopping Women Women's Handbag Leather Bag Fashion Bag Tote Bag Bags Shoulder Clutches Handbags Women Bag ,2)
           ; increments by 2
   WRITE !,$INCREMENT(xyz,"")
           ; null string increments by 0 (xyz=2)
   WRITE !,$INCREMENTShopping Pink Pocket Alter Ego Shaded Floral With Clippable in Zac's Print Pouch Bag Brown nETfY(xyz,"3A4") 
           Bag Fashion Women's Bags Clutches Bags Handbag Shoulder Women Bag Bag Shopping Leather Tote Handbags Shoulder Bag Gray Women ; 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