Client 4—An Interactive Query Processor
At this point, you should have a pretty good understanding of how to use many of the libpq functions. There are two other issues I want to explore in this chapter: processing multiple result sets and asynchronous operations. Before we get to those, let's convert the previous client application (client3d) into an interactive query processor. After you've done that, you will have a good example of why you need to consider multiple result sets and asynchronous processing.
The next client that we want to build connects to a database and prompts you for a SQL command. client4 sends the command to the server and display the results. The program repeats this cycle (prompt, execute, display) until you enter the ...
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