Function Syntax and Return Values

This topic describes the syntax and return values of the functions supplied with iWay Service Manager. Functions are listed in alphabetical order.

Any function can begin with the underscore character. Many functions must begin with the underscore character. This documentation shows the underscore character when it is required.

The underscore character prevents embedded strings from being evaluated. For example, the SQL statement

would result in an error if it were confused with the iWay _COUNT() function. The underscore in the iWay function distinguishes it from the SQL statement.

Reference: COND() Operators and Operands

Monadic means that there is only one operand on the left and if there is an operand on the right, it is ignored. For example: COND(FILE(xx),EXISTS).

Dyadic functions require two operands, as do comparisons.

The following table lists and describes the available operators and operands.

Operator	Operand	Description
EQC	Dyadic	Case-insensitive compare. The normal case (EQ) is case sensitive.
EXISTS	Monadic	Determines if the first operand exists. If the first operand is a special register SREG(name), the value is true if the register exists (is defined). Otherwise, the value is false. If the first operand is an XPATH expression such as XPATH(//SSS), the result is true if the node identified by the XPATH is found in the document. For all other operands, the function tests whether the operand has a length.
ISNULL	Monadic	For XPATH, determines if the identified node has a value. Results of this test can be ambiguous and its use is discouraged.
ISEMPTY	Monadic	Returns true if the operand has a value (that is, the node identified by the XPATH has a value).
ISNOTNULL	Monadic	Reverse of ISNULL.
ISTRUE	Monadic	Returns true if the value of the first operand is true or yes. Otherwise, returns false.
ISNOTTRUE	Monadic	Reverse of ISTRUE.
=, EQ <, LT <=, LE >, GT >=, GE !=, NE	Dyadic	Case-sensitive lexical compare or arithmetic compare.