Tutorial: Simple Query Processing

In this tutorial you will learn elementary steps in using Odysseus.

Step 1: Install/Start Nexmark

As sources we will use the Nexmark examples source. See Getting Started with Nexmark for the installation of the nexmark server.

Step 2: Install/Start Odysseus

For this example you should use the standard Odysseus Studio (Odysseus Server + Odysseus Studio Client) (See How to install Odysseus).

Step 3: Create a new project

Create a new project: FirstSteps

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The new project is shown in the project explorer (hint if you do not see the project explorer, use Window/Show View/Other ... and choose General/Project Explorer).

Step 4: Describe sources

The queries will access sources that deliver events. In our example we will connect to the already started nexmark server. In this examples we will use PQL to create the sources. For detailed information about source definitions see The Odysseus Access Operator Framework

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If you choose show data again, the source will be beginning from start(but only if no other connection to the nexmark-server is open, e.g. via bids).

Step 5: Formulating Queries

Now we are ready to formulate queries over the nexmark sources. For this, create a new Odysseus Script file named query1 the same way as above.

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