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Web Component Guide

particular runtime object in the Context Entry dialog. This is a much more efficient

way of directly accessing the object rather than causing the system to search all

objects until an ID match is found.

Click Save to save the query.

Parameters in Queries

Queries can be made aware of Query Selection Runtime Values. A Query Selection can

have parameters. Their values replace the specified Required Parameters in the query.

The Query Selection Runtime Value Parameters must exactly match the Required

Parameters.

Currently, the query attributes that can be replaced by parameter values are the query’s

Root Path, the Filter Results Based on Top N value, and the right side of a comparison

condition. The Root Path can only be replaced by a parameter that is a data object or a

list of data objects. The value of the parameter becomes the root object for the query

execution.

You can add additional path information under a parameter used for the Root Path. In

this case, the parameter value is assumed to be a data object, but the value used is the

given path into that data object.

For more information about using parameters, see “Query Definition Settings” on

page 77 and “Deriving a Query from Another Query” on page 97. For information about

aggregations see, “Creating an Aggregation” on page 83.

Creating a Query

Creating a query extracts data from a data source. Creating a query involves defining the

following elements:

• The type of objects that you want to select.

• Any parameters that you want to pass to the query.

• The selection criteria, or the where clause.

If parameters are passed to a query, you can use them to compare the properties of

selected objects to refine the Where clause.

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Dell Vizioncore Podręcznik Użytkownika Strona 94