Crestron CT-3000 Especificações descarregar pdf (Página 43)

Crestron e-control Database Manager SW-DBM

43 •• Demos Installation & Reference Guide — DOC. 5823

NOTE: Before proceeding to the actual demo page, start the server protocol by issuing the

Server | Start command.

The second page of demo 1 displays the names of six offices from the Addresses

table. The arrow buttons are used to scroll forward or backward or go to the first or

last six records in the list of offices in the Addresses table. Selecting an office

populates the data fields of the scroller.

Selecting a datafield opens page 3, which is the keyboard. Pressing any character on

the keyboard adds those characters to the text at the top of the page. Pressing bksp

backspaces over the characters on the text button. Pressing OK or Cancel returns to

page 2. OK replaces the text in the selected datafield with the characters from the

keyboard; Cancel leaves the datafield unchanged.

Demo 2 Successive Query

This demo illustrates the successive query technique described in “Successive

Queries” (page 38). It uses the Albums and Tracks databases joined together in the

example in the section on database joins (“Joins: Accessing Multiple Tables,” page

33).

To enable the GoLevel and GoLevelEcho signals that implement successive queries,

check the successive query checkbox in the Signal Block Definition window, and

indicate the number of levels needed for the query.

At the start of this demo, the scroller displays a list of music categories from the

Albums table using a GoLevelEcho1 signal indicating that this is the top level of the

successive query. The user “drills down” from these broad categories to finer levels

of detail, finally selecting a particular track on a particular album.

When the user selects a category in the scroller, the corresponding Pickn signal is

sent to the server.

The server responds with a GoLevelEcho2 signal that displays the selected category

and redefines the scroller to display a list of artists or groups that have albums of the

selected category.

The next pick drills down to albums of the selected artist or group, using

GoLevelEcho3.

Picking an album displays a list of tracks using GoLevelEcho4. The track

information comes from the Tracks table; it has been joined to the Albums table

using the CDJID column that exists in both tables and is used to match the tracks

with their albums.

Selecting a track displays information about that track and gives the user the option

to reselect the track, album, artist, or category. If the use reselects one of these levels,

the server sends the appropriate GoLevelEcho signal corresponding to the level of

the selection.

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Crestron CT-3000 Especificações Página 43