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Web Component Guide

to the underlying query, which is executed by the Query Selection. For more

information, see “Parameters in Queries” on page 94.

Parameters in a Query Selection are often used to specify the root path of a query. If the

root is not a parameter, it is an absolute path from the root of the data source. If a query's

root is specified with a parameter reference, then the corresponding parameter from the

Query Selection is assumed to have evaluated to a data object or a list of data objects.

That value is used as the root object for the query.

The behavior becomes more complex if the root is a parameter that evaluates to a list of

data objects, and the query specifies aggregation, such as Max. In this case you have a

choice:

Obtain just one aggregate value for the result of the query against all of the

elements in the list of data objects that is the value of the root object's

parameter.

Obtain one aggregate value for the result of the query against each element in

the list that is the value of the root object's parameter. The result is a list of

aggregated values.

Note For more information about aggregation, see “Aggregations” on page 82.

For example, you have a view which is a row-oriented table that displays a list of hosts

down the rows. You want to see the maximum severity of events for each host in

another column of the table, which requires using option b. If the root parameter is the

list of hosts, and the aggregate Query is selecting the maximum severity of events, then

the results are a list of the maximum severities of the events for each of the hosts (one

maximum per host).

Configuring the Query Selection

To configure the query selection:

Select the Values property of the desired column of the row-oriented table view.

Set that property to be a Query Selection accessing the correct query.

Check the Iterate Over 1st Parameter in the Query Selection.

Caution Failure to follow these steps results in the query showing just one value for all the

elements in the list (option a).

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Dell Vizioncore Betriebsanweisung Seite 136