Function_ class abstract final Query Builder

Factory for creating function expressions.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

abs(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the absolute value of the given numeric expression.

acos(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the inverse cosine of the given numeric expression.

asin(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the inverse sine of the given numeric expression.

atan(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the inverse tangent of the given numeric expression.

atan2({required ExpressionInterface y, required ExpressionInterface x}) → ExpressionInterface

Creates a function expression which evaluates to the arctangent of y/x.

avg(ExpressionInterface expression) → ExpressionInterface

Creates an aggregate function expression which averages the given values of the numeric expression.

ceil(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the ceiling of the given numeric expression.

contains(ExpressionInterface expression, {required ExpressionInterface substring}) → ExpressionInterface

Creates a function expression which evaluates to whether the given string expression contains the given substring.

cos(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the cosine of the given numeric expression.

count(ExpressionInterface expression) → ExpressionInterface

Creates an aggregate function expression which counts the values of the given expression.

degrees(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the degree value of the given radians numeric expression.

e() → ExpressionInterface

Creates a function expression which evaluates to the mathematical constant e.

exp(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates e to the power of the given numeric expression.

floor(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the floor of the given numeric expression.

ifMissingOrNull(ExpressionInterface expression1, ExpressionInterface expression2, [ExpressionInterface? expression3, ExpressionInterface? expression4, ExpressionInterface? expression5, ExpressionInterface? expression6, ExpressionInterface? expression7, ExpressionInterface? expression8, ExpressionInterface? expression9]) → ExpressionInterface

Creates a function expression which returns the first non-NULL, non-MISSING value from the given expressions.

ifMissingOrNullAll(Iterable<ExpressionInterface> expressions) → ExpressionInterface

Creates a function expression which returns the first non-NULL, non-MISSING value from the given expressions.

length(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the length of the given string expression.

ln(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the natural log of the given numeric expression.

log(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the base 10 log of the given numeric expression.

lower(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the lower case string of the given string expression.

ltrim(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the given string expression with the whitespace on the left side removed.

max(ExpressionInterface expression) → ExpressionInterface

Creates an aggregate function expression which evaluates to the greatest value of the given numeric expression.

millisToString(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the ISO 8601 date string in the device local timezone of the given milliseconds since the unix epoch expression.

millisToUTC(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the UTC ISO 8601 date string of the given milliseconds since the unix epoch expression.

min(ExpressionInterface expression) → ExpressionInterface

Creates an aggregate function expression which evaluates to the smallest value of the given numeric expression.

pi() → ExpressionInterface

Creates a function expression which evaluates to the mathematical constant Pi.

power({required ExpressionInterface base, required ExpressionInterface exponent}) → ExpressionInterface

Creates a function expression which evaluates to value of the base to the power of the exponent.

prediction(String model, ExpressionInterface input) → PredictionFunction

Creates a prediction function expression with the given model and input.

radians(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the radians value of the given degree numeric expression.

round(ExpressionInterface expression, {ExpressionInterface? digits}) → ExpressionInterface

Creates a function expression which rounds the given numeric expression to the given number of digits.

rtrim(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the given string expression with the whitespace on the right side removed.

sign(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the sing (1: positive, -1: negative, 0: zero) of the given degree numeric expression.

sin(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the sine of the given numeric expression.

sqrt(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the square root of the given numeric expression.

stringToMillis(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the number of milliseconds since the unix epoch of the given ISO 8601 date string expression.

stringToUTC(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the ISO 8601 UTC date time string of the given ISO 8601 date string expression.

sum(ExpressionInterface expression) → ExpressionInterface

Creates an aggregate function expression which evaluates to sum of the values of the given numeric expression.

tan(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the tangent of the given numeric expression.

trim(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the given string expression with the whitespace on both sides removed.

trunc(ExpressionInterface expression, {ExpressionInterface? digits}) → ExpressionInterface

Creates a function expression which truncates the given numeric expression to the given number of decimal digits.

upper(ExpressionInterface expression) → ExpressionInterface

Creates a function expression which evaluates to the upper case string of the given string expression.