Arguments
A PDI argument is a named, user-supplied, single-value input given as a command line argument (running a transformation or job manually from Pan or Kitchen, or as part of a script). Each transformation or job can have a maximum of 10 arguments.
Parameters
Parameters are like local variables; they are reusable inputs that apply only to the specific transformation that they are defined in. When defining a parameter, you can assign it a default value to use in the event that one is not fetched for it. This feature makes it unique among dynamic input types in PDI.
Note: If there is a name collision between a parameter and a variable, the parameter will take precedence.
To define a parameter, right-click on the transformation workspace and select Transformation settings from
the context menu (or just press Ctrl-T), then click on the Parameters tab.
Variables
A variable in PDI is a piece of user-supplied information that can be used dynamically and programmatically in a variety of different scopes. A variable can be local to a single step, or be available to the entire JVM that PDI is running in.
PDI variables can be used in steps in both jobs and transformations. You define variables with the Set Variable step in a transformation, by hand through the kettle.properties file, or through the Set Environment Variables dialogue in the Edit menu.
TheGet Variable step can explicitly retrieve a value from a variable, or you can use it in any PDI text field that has the diamond dollar sign icon next to it by using a metadata string in either the Unix or Windows formats:
${VARIABLE}
%%VARIABLE%%
Source: Pentaho user guide
A PDI argument is a named, user-supplied, single-value input given as a command line argument (running a transformation or job manually from Pan or Kitchen, or as part of a script). Each transformation or job can have a maximum of 10 arguments.
Parameters
Parameters are like local variables; they are reusable inputs that apply only to the specific transformation that they are defined in. When defining a parameter, you can assign it a default value to use in the event that one is not fetched for it. This feature makes it unique among dynamic input types in PDI.
Note: If there is a name collision between a parameter and a variable, the parameter will take precedence.
To define a parameter, right-click on the transformation workspace and select Transformation settings from
the context menu (or just press Ctrl-T), then click on the Parameters tab.
Variables
A variable in PDI is a piece of user-supplied information that can be used dynamically and programmatically in a variety of different scopes. A variable can be local to a single step, or be available to the entire JVM that PDI is running in.
PDI variables can be used in steps in both jobs and transformations. You define variables with the Set Variable step in a transformation, by hand through the kettle.properties file, or through the Set Environment Variables dialogue in the Edit menu.
TheGet Variable step can explicitly retrieve a value from a variable, or you can use it in any PDI text field that has the diamond dollar sign icon next to it by using a metadata string in either the Unix or Windows formats:
${VARIABLE}
%%VARIABLE%%
Source: Pentaho user guide
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