Home
Functions and Expressions
Use HCL Link functions and expressions to create component rules and map rules.
Flow functions
Use Flow functions to specify a value for each of the flow variables defined for a flow, and additionally, to alter an already specified value for a flow variable.
DELETEVARIABLE
The DELETEVARIABLE function deletes a flow variable defined for a flow.

Functions and Expressions
Use HCL Link functions and expressions to create component rules and map rules.
- Expressions and evaluations
  The documentation provided here describes HCL Link functions and expressions. Functions and expressions are used to create component rules and map rules.
- Using functions
  A function is an expression that generates an output by performing a certain operation on one or more inputs.
- Syntax of a function
  The following is an example of a function:
- Function argument syntax
  Arguments typically have some restrictions on the expression used for that argument.
- Character-set encoding functions
  Functions that use the HCL Link EXIT architecture convert data to the native character set of the platform as part of the function call.
- General functions
  There are several general functions you can call from map rule to process input.
- Bidirectional functions
  Bidirectional languages such as Arabic and Hebrew are languages in which the text is presented to the user ordered from right to left, but numbers and Latin alphabetic strings within the text are presented left to right.
- Bit manipulation and testing functions
  You can use this function to manipulate and to test a bit in a binary number.
- Cache functions
  Use cache functions to specify a value for each of the cache variables defined for a flow, and additionally, to alter an already specified value for a cache variable.
- Conversion functions
  You can use this function to convert an expression from one datatype to another datatype.
- Date/time functions
  You can use this function to perform various operations on date and time.
- Error handling functions
  You can use this function in evaluating the type of error during map execution.
- External interface functions
  You can use this function to retrieve data from a database from within in a map rule.
- Flow functions
  Use Flow functions to specify a value for each of the flow variables defined for a flow, and additionally, to alter an already specified value for a flow variable.
  - DECVARIABLE
    The DECVARIABLE function decrements the numeric value a flow variable.
  - DELETEVARIABLE
    The DELETEVARIABLE function deletes a flow variable defined for a flow.
  - GETVARIABLE
    The GETVARIABLE function retrieves the value associated to a flow variable.
  - INCVARIABLE
    The INCVARIABLE function increments the numeric value for a flow variable.
  - RESOLVEVARIABLE
    The RESOLVEVARIABLE function resolves all flow variables in a given text.
  - SETVARIABLE
    The SETVARIABLE function sets a new, or updates an existing flow variable. This function specifies the name of a flow variable if one does not already exist. Otherwise, it updates the value of an existing flow variable with the new value.
- Inspection functions
  You can use this function to test and inspect the object.
- Logical functions
  Logical functions provide a way to use logical conditions to display one of several values.
- Lookup and reference functions
  These function search operates by scanning the appropriate set of items in sequence, attempting to match the logical condition.
- Math and statistics functions
  Precede all MATHLIB functions with mathlib->
- Text functions
  These functions are used to convert the text item in a map rule.
- XML functions
  There are several XML functions that you can call from component rules and map rules to process input XML data.
- Custom functions
  From the Type Designer or Map Designer, you can create custom functions to call external libraries.
- Date and time format strings
  You can use the listed format strings for numbers, dates and times in functions such as the CURRENTDATETIME, FROMNUMBER, TONUMBER, FROMDATETIME, and TODATETIME.
- Number format strings
  You can create custom number formats by using the given format strings.
- RUN function return codes
  The RUN function return codes and messages might result when using the RUN function.
- Character set codes for CPACKAGE, CSERIESTOTEXT, and CTEXT
  The second argument of the CPACKAGE, CSERIESTOTEXT, and CTEXT functions specifies the character set of the output of the function. The value of the second argument (the character set of the object content), must be a valid character set code.

DELETEVARIABLE

The DELETEVARIABLE function deletes a flow variable defined for a flow.

The Special (reserved or internal) flow variables cannot be deleted with this function. All flow variables, custom and special, are deleted by default when flow instance finishes its execution. Use this function when a flow variable must be removed from the visible scope of nodes in a flow execution. A flow variable has to be deleted as setting empty value does not affect the value or existence of the flow variable.

This function returns a default value if specified, or an empty value if the flow variable has not been defined, or if it has been deleted prior to making this function invocation. Otherwise, it returns the associated value of the flow variable to the map in text format and deletes the flow variable from the scope of flow instance.

Syntax:: DELETEVARIABLE (single-text-expression [, single-text-expression])
Meaning:: DELETEVARIABLE (variable_name [, default_value])
Returns:: A single text item if found, otherwise none

Examples

flowlib ->DELETEVARIABLE (“Greeting”)
Deletes flow variable, Greeting, if defined and returns value associated to it. Otherwise, returns empty.
flowlib ->DELETEVARIABLE (“Greeting”, “Hi”)
Deletes flow variable, Greeting, if defined and returns value associated to it. Otherwise, returns default value, Hi, to the map.