Adding an Operator

Add an operator such as Select, Join, Order By, or Aggregate to a view model. Operators specify how your view model transforms and integrates data.

Prerequisites 

Before starting this procedure, create a view model and add at least one Input Source element.

When you add an operator to the data flow in a view model, you must connect it to other elements for appropriate inputs and outputs; what these other elements are depends on the operator and on the task your view model is performing. Most operators require at least one input and one output. You can’t set an operator’s properties until it’s connected to an input.

Follow these steps to create an operator and connect it to inputs (upstream) and outputs (downstream).

  1. Click an operator in the Operators or the Advanced section of the palette (immediately to the left of the view model pane).
  2. Click in the view model pane to create the new operator.
    Note: To insert the new operator into the flow between two existing operators, click the line that connects them.
    A new operator appears in the spot where you clicked.
  3. If necessary, connect the new operator to inputs and outputs:
    1. Click Connection in the palette.
    2. Click the upstream element that will provide input (an Input Source element or another operator), then click the new operator. A line connecting the data source to the new operator appears in the view model.
    3. Repeat for additional inputs.
    4. Click Connection, the new operator, and the downstream element that will receive output (the Result element or another operator). A line connecting the new operator to the recipient of its data appears in the view model.
  4. Enter Control S to save the view model.
  5. Double-click the new operator to open its properties dialog.
Next 

See the operator’s properties topic for information on setting its properties.

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