Simple evaluation

Description

The Simple evaluation action evaluates contents or value of a variable or a field in the result stream.

Connect two actions with the output of the Simple Evaluation.

The green (success) hop will be called if the condition was evaluated successfully, the red (failure) one will be called if the condition wasn’t evaluated successfully.

Usage

  • A Null value is the same as an empty string. For example, to detect a null for any data type, set the Type to String, and the Success condition to "If value is equal to", and have the Value textbox empty.

  • The Simple evaluation Action is limited. For more complex conditions see: https://hop.apache.org/manual/latest/workflow/actions/eval.html

Options

Option Description

Action name

The name of the workflow action.

Source

Evaluate

Evaluation type: field or variable.

Field name

The field to evaluate

Type

Data type.

Success On

Success condition

  • If value equal to

  • If value different from

  • If value contains

  • If value not contains

  • If value starts with

  • If value not starts with

  • If value ends with

  • If value not ends with

  • If value valid regex

  • If value in list

  • If value not in list

Value

The value to compare.

Tips

Evaluating a variable

Field Value Explanation

Source: Evaluate

Variable

Select this to evaluate a variable set before

Source: Variable name

e. g. ${VAR1}

Enter the variable name using the usual syntax

Source: Type

String, Number etc.

The type of your variable

Success on: Success when variable set

When this option is selected, the true path is followed when the variable is set. Note: The workflow action checks if the variable is defined, so an empty or null value is also true. When testing this within Hop you need to delete the line with the variable in the variables section of the Execute a workflow window. And remember: Once this variable is set, the variable keeps existing, even when deleting it from the list.

Success On: Success condition

Equal/Non equal/etc.

Select the condition to be met for a successful result

Success On: Value

Value to compare the variable to

Evaluating a field

Field Value Explanation

Source: Evaluate

Field from previous result

Select this to evaluate a field value (generated by a pipeline using Copy rows to result)

Source: Field name

Enter the field name from the result row

Source: Type

String, Number etc.

The type of your field

Success On: Success condition

Equal/Non equal/etc.

Select the condition to be met for a successful result

Success On: Value

Value to compare the field to