PostgreSQL, Second Edition

Client 3—An Interactive Query Processor

In this section, we'll build an interactive command processor in Tcl/Tk. Fortunately, we can reuse most of the code that we developed in client2.tcl. I'll explain the differences and point out where we can share code with the previous client.

Figure 16.5 presents what we are trying to build.

Figure 16.5. The client3.tcl-results.

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You can see that this application is similar to the previous application. I've added a few widgets: a label at the top of the window that tells the user what to do, a text entry widget where you enter commands, and a status bar that gives feedback.

Now, let's ...